ECG Implementation on the TMS320C5515 DSP Medical Development Kit
Transcript of ECG Implementation on the TMS320C5515 DSP Medical Development Kit
Application ReportSPRAB36B–June 2010
ECG Implementation on the TMS320C5515 DSP MedicalDevelopment Kit (MDK)
Vishal Markandey .............................................................................................................................
ABSTRACT
The medical development kit (MDK) provides a development platform to TI medical customers, thirdparties, and other developers. This application report focuses on the C5515 MDK; however, the analogfront ends that are included can also be used with other platforms.
Please be aware that an important notice concerning availability, standard warranty, and use in criticalapplications of Texas Instruments semiconductor products and disclaimers thereto appears at the end ofthis document.
NOTE: Disclaimer Statement: Do not use this medical development kit for the purpose ofdiagnosing patients.
This application report may not include all of the details necessary to completely develop thedesign. It is provided as a reference and only intended to demonstrate the ECG application.
Contents1 Introduction .................................................................................................................. 22 Front-End Architecture ..................................................................................................... 53 DSP Subsystem ........................................................................................................... 114 PC Application ............................................................................................................. 175 Installation .................................................................................................................. 176 Running the Demo Application .......................................................................................... 207 Options and Selections ................................................................................................... 218 References ................................................................................................................. 22Appendix A Front-End Board Schematics ................................................................................... 23Appendix B Front-End Board BOM ........................................................................................... 30Appendix C Sensors and Accessories ....................................................................................... 33Appendix D MEDICAL DEVELOPMENT KIT (MDK) WARNINGS, RESTRICTIONS AND DISCLAIMER .......... 34
List of Figures
1 MDK Hardware Overview .................................................................................................. 3
2 ECG Board................................................................................................................... 4
3 ECG Front-End Block Diagram ........................................................................................... 6
4 De-Fibrillation Protection Circuit .......................................................................................... 7
5 Right-Leg-Drive Circuit ..................................................................................................... 7
6 Lead-Off Detection Circuit ................................................................................................. 8
7 Lead I Formation ............................................................................................................ 9
8 LPF for Lead II .............................................................................................................. 9
9 Block Diagram of ADS1258 .............................................................................................. 10
10 Interface Between ADS1258 and DSP ................................................................................. 10
11 DSP Software Architecture............................................................................................... 12
12 DC Removal Filter Response ............................................................................................ 13
1SPRAB36B–June 2010 ECG Implementation on the TMS320C5515 DSP Medical Development Kit(MDK)
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Introduction www.ti.com
13 Pole and Zero Location for IIR Filter .................................................................................... 13
14 1Hz Signal Response via DC Removal Filter.......................................................................... 14
15 MBF Frequency Response............................................................................................... 15
16 Buffer-Shifting Convolution Algorithm................................................................................... 15
17 ECG Front-End Mounted on the C5515 EVM ......................................................................... 18
18 Input Dialog Box ........................................................................................................... 20
19 Display on the EVM LCD Screen........................................................................................ 21
20 ECG_I_II .................................................................................................................... 23
21 ECG_LEAD_V1_V2_V3 .................................................................................................. 24
22 ECG_LEAD_V4_V5_V6 .................................................................................................. 25
23 ECG_ADC .................................................................................................................. 26
24 ECG_LEAD_OFF_DET................................................................................................... 27
25 Right Leg Drive ............................................................................................................ 28
26 PWR_CONN_INTRFCE .................................................................................................. 29
27 ECG Cable Details ........................................................................................................ 33
List of Tables
1 J22 Connector Interface .................................................................................................. 11
2 Release CD Contents..................................................................................................... 19
3 Bill of Material .............................................................................................................. 30
1 Introduction
A number of emerging medical applications such as electrocardiography (ECG), digital stethoscope,and pulse oximeters require DSP processing performance at very low power. The TMS320C5515digital signal processor (DSP) is ideally suited for such applications. The C5515 is a member of TI'sC5000™ fixed-point DSP platform. To enable the development of a broad range of medicalapplications on the C5515, Texas Instruments has developed an MDK based on the C5515 DSP. Atypical medical application includes:
• An analog front end, including sensors to pick up signals of interest from the body• Signal processing algorithms for signal conditioning, performing measurements and running analytics
on measurements to determine the health condition• User control and interaction, including graphical display of the signal processing results and
connectivity to enable remote patient monitoring
1.1 Medical Development Kit (MDK) Overview
The MDK is designed to support complete medical applications development. It includes the followingelements:
• Analog front-end boards (FE boards) specific to the key target medical applications of the C5515(ECG, digital stethoscope, pulse oximeter), highlighting the use of the TI analog components formedical applications
• C5515 DSP evaluation module (EVM) main board• Medical applications software including example demonstrations
C5000, Code Composer Studio are trademarks of Texas Instruments.All other trademarks are the property of their respective owners.
2 ECG Implementation on the TMS320C5515 DSP Medical Development Kit SPRAB36B–June 2010(MDK)
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ECGFront End
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www.ti.com Introduction
Figure 1 shows an overview of the MDK hardware, consisting of individual analog front-end boards forECG, digital stethoscope, pulse oximeter, and the C5515 DSP EVM. Any of the analog front-end boardscan be connected, one of at a time, to the C5515 EVM using universal connectors on the front-end boardsand the EVM. The analog front-end boards connect to the appropriate sensors for the ECG, digitalstethoscope or the pulse oximeter, and perform analog signal conditioning and analog-to-digital (A/D)conversion of the signals from the sensor. Then, the digital signal is sent to the C5515 EVM where theC5515 DSP performs signal processing algorithms for the application. The DSP is also responsible formanaging user control and interaction including graphical display of the signal processing results. Thesignal processing results can also be transferred from the C5515 EVM to a PC for further display,analysis, and storage using the PC application software that is provided with the MDK.
Figure 1. MDK Hardware Overview
1.2 MDK ECG System
An electrocardiogram (ECG/EKG) is the recording of the electrical activities of the heart and is used in theinvestigation of heart disease. The electrical waves can be measured by selectively placed electrodes(electrical contacts) on the skin.
1.2.1 Key Features
The key features of the MDK ECG system are:
• 12 lead ECG output using 10 electrode input• Defibrillator protection circuitry• Diagnostic quality ECG with bandwidth of 0.05 Hz to 150 Hz• Heartbeat rate display• Leads off detection• Real-time 12 lead ECG waveform display on EVM LCD screen, one lead selectable at a time• Zoom option for the Y-axis (amplitude) on EVM LCD screen• Real-time 12 lead ECG waveform display on PC, three leads at a time• Zoom function on X-axis (time) and Y-axis (amplitude) on PC application• Freeze screen option on PC Application• Recording of ECG data and offline view option of recorded ECG data on PC application
3SPRAB36B–June 2010 ECG Implementation on the TMS320C5515 DSP Medical Development Kit(MDK)
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DB-15 Conn.
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Introduction www.ti.com
1.2.2 MDK Hardware
Several elements of the MDK ECG system are:
• C5515 EVM• ECG front-end board• ECG cable
1.2.2.1 C5515 EVM
The EVM comes with a full compliment of on-board devices that suit a wide variety of applicationenvironments.
For further details on the C5515 EVM, see the Medical Devlopment Kit provided with your EVM.
Key components and interfaces of the C5515 EVM used in the MDK ECG system include:
• Texas Instrument's TMS320C5515 operating at 100 MHz• User universal serial bus (USB) port via the C5515• Inter-integrated circuit (I2C) /serial peripheral interface (SPI) electrically erasable programmable
read-only memory (EEPROM)• External memory interface (EMIF), I2C, universal asynchronous receiver/transmitter (UART), SPI
interfaces• SAR• External IEEE Standard 1149.1-1990, IEEE Standard Test Access Port and Boundary-Scan
Architecture (JTAG) emulation interface• Embedded JTAG controller• Color LCD display• Keys (user switches)
The EVM operates from a + 5 V external power supply or battery and is designed to work with TI’s CodeComposer Studio™ integrated development environment (IDE). Code Composer Studio communicateswith the EVM board through the external emulator, or on-board emulator.
1.2.2.2 ECG Front-End Board
Figure 2 shows the ECG front-end board. The potentials captured by the electrodes are passed throughthe defibrillator protection (DP) circuit in the ECG front-end board. Then, the front end board derives 8 outof 12 ECG leads and provides the digital input to the DSP subsystem. The front-end board can beinterfaced with the EVM board through a universal front-end connector. The front-end board is interfacedwith and powered by the C5515 EVM board through the universal front-end connector by using I2C andI2S interfaces.
The 16 channel analog-to-digital converter (ADC) (ADS1258) on the front-end board is configured for 500Hz sampling with 24-bit data resolution. ADC is interfaced with the C5515 using the SPI bus.
Figure 2. ECG Board
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1.2.2.3 ECG Cable
The ECG cable consists of four limb and six chest electrodes. This cable is connected to the front-endboard through the DB15 connector. The ECG electrodes pick up ECG signals from the ECGsimulator/patient and send them to the ECG front-end board; an off-the-shelf ECG cable is used. For moredetails regarding ECG cable, see Appendix C.
1.2.3 MDK Software
The software for the MDK application includes:
• C5515 software application• PC application
1.2.3.1 C5515 Software Application
The hardware is initialized by the DSP on the EVM. The DSP reads the digitized signals from the ADCthrough the SPI interface. The DSP subsystem conditions the ECG signals by removing DC offset andnoise using digital filters. Then, the DSP subsystem derives the remaining four ECG electrodes, lead offstatus, and heart rate. The DSP subsystem also displays one channel ECG wave form, lead offinformation and heart rate on the LCD screen and sends the the ECG data to the PC application throughthe UART interface.
1.2.3.2 PC Application
The PC application, which has to be installed on the PC, can be used for viewing the ECG waveform,heart rate, and lead off information. It also provides options to zoom, store and playback the signalstransmitted from the EVM. The PC application can operate in two modes: online and offline.
2 Front-End Architecture
The front-end board has a DB15 connector to allow connection for 10 electrode ECG cables; it can beinterfaced with the EVM board through the universal front-end connector. The C5515 EVM board suppliespower to the front-end board through the universal front-end connector.
5SPRAB36B–June 2010 ECG Implementation on the TMS320C5515 DSP Medical Development Kit(MDK)
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Defibrillator
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Figure 3 shows the ECG front-end board architecture.
Figure 3. ECG Front-End Block Diagram
The front-end board contains the following stages:
• Defibrillator protection• Right leg driving circuit• Lead off detection• Derives eight ECG leads using differential amplifier (instrumentation amplifier)• Low-pass filtering (anti-aliasing)• Analog-to-digital conversion (ADC)
2.1 Defibrillator Protection
WARNINGIf defibrillator is used for development purposes, use of medicalgrade EVM input power supply (Accessory Part Number: SL PowerAULT Model MW173KB0503F01) is strongly recommended. Use ofthe Isolator (Accessory Part Number: MOXA Model Name: TCC-82)that isolates the MDK from the PC is also strongly recommended.These accessories provide additional supplemental protection todevelopment users from high voltages that may be present whenintroducing defibrillator voltages during development simulation.There may also be other voltage transients sourced from thedefibrillator to accompanying interface hardware such as apersonal computer when used in conjunction with the ECG/EVMdevelopment hardware.
The defibrillator protection circuit protects the ECG system while the defibrillator is used on the patient.
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R1 R2
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The neon lamps and clamping diodes (zener diodes) are connected across the electrode input lines, toprovide protection from the defibrillator pulse. The neon lamps give the first level of protection and theclamping diodes give the second level of protection. These shunting devices are used to bypass largevoltage applied during defibrillation. The neon lamp (NE2 series) shunts voltages above 70 V-80 V. Zenerdiodes, with a breakdown voltage of 9.1 V, are used for shunting the voltage dropped across neon lampsto a safe 11.6 V ( VCC + VZ = 2.5 + 9.1) before it appears across the instrumentation amplifiers. A currentlimiting resistor (R1) of 20K with high energy withstanding capability (~ 2.5J) and power rating (> 1W) isplaced in the series on each input line, which limits the current flow. One more current limiting resistor(R2) of 10K is put in between the neon lamp and the zener diodes to prevent high current from passingthrough the zener diodes. Figure 4 depicts the protection circuitry.
Figure 4. De-Fibrillation Protection Circuit
2.2 Right Leg Drive Circuit
A right-leg-drive circuit (RLD) is used as an alternative to the grounding of a patient with the MDK ECGsystem. In the RLD circuit, an electrode attached to the right leg is driven by the output of an auxiliaryoperational amplifier, where the common-mode voltage is sensed and amplified. The negative feedback ofa common-mode signal in this circuit drives the common-mode voltage low. In turn, the body’sdisplacement current flows to the op-amp output circuit, which reduces the pickup of the ECG system andeffectively grounds the patient. The averaging is done with the electrode signals RA, LA and LL. OPA335is used as the inverting amplifier for the RLD circuit. The gain of the RLD circuit design is -39.
Figure 5. Right-Leg-Drive Circuit
2.3 Lead-Off Detection
The lead-off detection circuit detects the lead status for all the electrodes except RL.The lead-off detectionhas pull up registers, comparator (TLV3404) and an I2C port expander (PCA9535) as shown in Figure 6.
The ECG electrode leads, except RL, are connected to a pull up resistor (10 M); when any one of theleads is disconnected, the voltage for that lead is pulled up to VCC (+ 2.3 V).
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Front-End Architecture www.ti.com
The pull up circuit outputs are connected to the negative and positive terminals of the comparator, and setto 500 mV (threshold voltage). When any lead gets disconnected, the output of the comparator for thatlead becomes 0 V. The output of the comparator is connected to the I2C port expander. The portexpander generates an interrupt to the DSP whenever there is any change in the input voltage. Theinterrupt service routine at the DSP reads the output of the port expander using I2C lines and,correspondingly, updates the lead-off status.
Figure 6. Lead-Off Detection Circuit
2.4 Lead Formation Using Instrumentation Amplifier
The following ECG leads are formed using instrumentation amplifier (INA128) and ECG electrodecombinations:
Lead I = LA – RA
Lead II = LL – RA
Lead V1 = V1 - (LA + RA + LL) / 3
Lead V2 = V2 - (LA + RA + LL) / 3
Lead V3 = V3 - (LA + RA + LL) / 3
Lead V4 = V4 - (LA + RA + LL) / 3
Lead V5 = V5 - (LA + RA + LL) / 3
Lead V6 = V6 - (LA + RA + LL) / 3
Where, RA, LL, LA and V1 to V6 are ECG electrodes.
Lead I is formed by connecting LA to the instrumentation amplifier’s non-inverting input, while RA isconnected to the inverting input. Lead II is formed by connecting LL to the instrumentation amplifier’snon-inverting input, while RA is connected to the inverting input.
Uni-polar chest leads (Lead V1 to Lead V6) are formed by applying the corresponding electrodes to thenon-inverting input of the instrumentation amplifier, while the inverting input is connected with the averageof the RA, LA and LL signals. The average is calculated by addition using three equal value resistors.
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Figure 7 shows the lead formation for Lead I.
Figure 7. Lead I Formation
The instrumentation amplifier also provides amplification of the weak input signal. The gain of the amplifieris set to 8.35 by using a 6.8K (R4) nominal value precision resistor.
2.5 Low-Pass Filters (Anti-Aliasing)
An active first-order, low-pass filter (LPF) is used for anti-aliasing and for removing frequencies above 150Hz from each of the ECG leads. The LPF has a cutoff at 150 Hz. The instrumentation amplifier output isfed to the LPF filter input. Figure 8 shows the implementation for the LPF.
Figure 8. LPF for Lead II
2.6 Analog-to-Digital Conversion (ADC)
Analog signals are converted to digital before sending them to the DSP sub-system. LPF output isconnected as input to the ADC (ADS1258).
9SPRAB36B–June 2010 ECG Implementation on the TMS320C5515 DSP Medical Development Kit(MDK)
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AVDD
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Front-End Architecture www.ti.com
ADS1258 is a 16-channel, 24-bit delta-sigma ADC. Figure 9 shows the block diagram of ADS1258.
Figure 9. Block Diagram of ADS1258
The following configuration is used for the ADS1258:
Host to ADC interface SPISampling frequency 500 HzData format 24-bit linearADC mode used Fixed channel modeReference voltage 2.5 V
The eight ECG lead outputs from the LPF are connected to eight channels of the ADS1258. Using SPIinterface, the ADC is connected to the C5515 for 500 sps/channels with 24-bit resolution.
The ADS1258 is interfaced to C5515 DSP as shown in Figure 10.
Figure 10. Interface Between ADS1258 and DSP
2.7 Front-End Connector
The front-end board is connected to the EVM through the universal front-end connector, which consists ofthree connector interfaces with legends on the EVM: J20, J21, and J22.
10 ECG Implementation on the TMS320C5515 DSP Medical Development Kit SPRAB36B–June 2010(MDK)
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2.7.1 J20 Connector Interface at C5515 EVM
The mating for this connector is maintained, but no signals are used by the ECG front-end board.
2.7.2 J21 Connector Interface at C5515 EVM
This connector carries the 5 V, 3.3 V and 1.8 V from the C5515 EVM. These voltages act as the primarysource for the ECG front-end board.
2.7.3 J22 Connector Interface at C5515 EVM
This connector carries GPIOs, I2C, SPI and interrupt (INT1) connections from the C5515 EVM to thefront-end board. Pin mapping for the used interfaces are shown in Table 1.
Table 1. J22 Connector Interface
Connector Pin Number Signal Assigned
1 SPI_START
3 SPI_CLK
7 SPI_CS
11 SPI_IN
12 SPI_DRDY
13 SPI_OUT
15 I2C_INT
16 I2C_SCL
20 I2C_SDA
3 DSP Subsystem
The DSP software, running on the C5515 EVM, takes the digitized signal from the front-end board andprocesses it the same. The DSP receives eight ECG lead data from the ADC through the SPI interface.Then, filters are applied to remove DC signal, 50/60 Hz power line noise, and unwanted signals. Thefiltered signal is used to detect the heart rate and to obtain four ECG leads: Lead III, aVR, aVL and aVF.
The software is designed to handle the following activities:
• Data acquisition through ADC• Lead-off detection• DC signal removal• Multi band-pass filtering• ECG leads formation• QRS (HR) detection• Display of ECG data• UART communication
11SPRAB36B–June 2010 ECG Implementation on the TMS320C5515 DSP Medical Development Kit(MDK)
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DSP Subsystem www.ti.com
Figure 11 shows the high-level architecture of DSP subsystem.
Figure 11. DSP Software Architecture
The various blocks of the DSP subsystem are described in the following sections.
3.1 Data Acquisition
Using the C5515 timer, an interrupt is generated every 250 ms to sequentially acquire 500 sps of eightECG leads. The interrupt service routine (ISR) issues a set channel number and (SOC) command to theADC to acquire 24-bits of ECG data for the selected channel. The acquired data is provided to the infiniteimpulse response (IIR) filter module after downscaling to 20 bits; the data read for the same channelhappens after every 2 ms. The ADC is interfaced with the DSP through the SPI bus.
3.2 Lead-Off Detection
The lead status is read in the IIR for INTR1 of the C5515 (external interrupt 1). This interrupt is generatedin the front ECG board by the I2C port expander as and when the lead status is changed.
3.3 Interrupt Service Routine (IIR) Filter - DC Signal Removal
The DC signals from the eight ECG leads are removed by using the first-order IIR filter. The followingtransfer function is used for the filter:
To provide DC attenuation of 22 dB, the value of alpha is chosen as 0.992. The IIR filter output isdownscaled to 16 bits and then provided to the finite impulse response (FIR) filter.
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Figure 12 shows the frequency response for the filter.
Figure 12. DC Removal Filter Response
Figure 13 shows the pole and zero location for the IIR filter. The pole is located at z = 0.992 and zero at 1in the Z plane.
Figure 13. Pole and Zero Location for IIR Filter
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Figure 14 shows 1 Hz signal response via the DC removal filter.
Figure 14. 1Hz Signal Response via DC Removal Filter
3.4 FIR Filter
The multi band-pass filter (MBF) is used for removing unwanted signals and power line noise from the DCremoved ECG lead data.
The MBF digital filter being used is the FIR hamming window with the order of 351, which provides cutoffat 150 Hz and notch at 50/60 Hz; the notch frequency is compile-time programmable. This filter alsoprovides a very sharp cutoff at 150 Hz with attenuation of 60 dB at stop-band and notch at 8 dBattenuation. The sampling frequency is 500 samples/second.
14 ECG Implementation on the TMS320C5515 DSP Medical Development Kit SPRAB36B–June 2010(MDK)
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x(n) x(n-1) x(n-2) . . . . . x(n-L+2) x(n-L+1)
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Discarded
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Current time, n
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Figure 15 shows simulation results for the MBF.
Figure 15. MBF Frequency Response
Buffer-shifting convolution algorithm is used for the realization of the MBF filter. The filter window is shiftedfor every filtered sample and to insert the new sample into the buffer as depicted in Figure 16.
Figure 16. Buffer-Shifting Convolution Algorithm
3.5 ECG Lead Computation
Eight ECG lead data from the MBF filter is fed to the ECG lead formation module. This module computesthe remaining four ECG lead data using the following formula:
Lead III = Lead II - Lead I
Lead aVR = - Lead II + 0.5 * Lead III
Lead aVL = Lead I - 0.5 * Lead II
Lead aVF = Lead III + 0.5 * Lead I
3.6 QRS (HR) Detection Algorithm
QRS detection is based on the first derivative of the Lead II ECG signal and threshold. Once fiveconsecutive QRS are detected, the heart rate is calculated by taking the average of the five RR intervals.
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The following steps are involved for calculating heart rate:
1. Calculate the first derivative of the Lead II ECG signal samples. The first derivative for any sample iscalculated as:y0(n) = |x(n + 1) – x(n - 1)|Where, y0(n) is the first derivative.x(n + 1) is the sample value for (n + 1)th samplex(n – 1) is the sample value for (n – 1)th sampleThe initial 2sec of the first derivatives in a buffer are stored and the maximum value (P) in this bufferare obtained.
2. Calculate the threshold as 0.7 * P.3. Compare each of the first derivative values calculated with the calculated threshold.4. Mark the ECG sample index (S1) of that particular sample, whenever a derivative crosses the
threshold.5. Detect the QRS peak by scanning the next 40 derivatives (MAXIMA_SEARCH_WINDOW = 40) and
obtaining the maxima (M1). This maxima (M1) value is stored in another buffer.
6. Skip the next 50 samples (SKIP_WINDOW = 50) to take care of the minimum RR interval that canoccur in case of maximum detectable heart rate (i.e., 240 BPM), after detecting a QRS peak.
7. Detect the next five QRS peaks by repeating steps 3 to 6.8. Calculate the RR interval as the number of samples between two consecutive QRS peaks.9. Calculate heart rate using the following formula:
HR per Minute = (60 * Sampling Rate)/(Average RR interval for five consecutive RR intervals)10. Recalculate threshold from the QRS peak values detected.
3.7 LCD Display
The LCD display shows the ECG, heart rate, and lead-off status. The display is controlled using the SW7and SW8 keys on the EVM as mentioned in Section 7.1.1. For each of these keys, an interrupt isgenerated and communicated to the DSP through the SAR interrupt. The interrupt service routine for thekey that is pressed takes care of the corresponding action for the interrupt.
3.8 Universal Asynchronous Receiver/Transmitter (UART)
The data sent to the PC through UART has eight ECG lead data; these signals are sent at 250 sps/lead.The PC application derives the remaining four ECG leads using the Lead I and Lead II data. Asynchronization frame (header) of 5 bytes is also sent to the UART interface every 1 s. The packetnumber, heart rate, and lead status values are sent along with the ECG header. The header is followed byinterleaved samples of eight ECG leads. The interval between the two ECG data packets is 500 ms. Thepacket number gets incremented for every new sample sent.
The UART configuration is set as 115200 bps, 8 bits data, 1 stop bit and no parity.
16 ECG Implementation on the TMS320C5515 DSP Medical Development Kit SPRAB36B–June 2010(MDK)
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ECG Header
Lead LeadPacket00 80 00 80 00 Heart Rate Status StatusNumber (Low) (High)
ECG Data
Current Channel Low 8 Bits Current Channel High 8 Bits
4 PC Application
The PC application is used for viewing the ECG waveform and ECG values. It also provides options tozoom, store and playback the signals.
The PC application has two modes of operation: online and offline.
• Online mode: the ECG data is plotted in real-time as a scrolling display• Offline mode: the recorded ECG data is displayed for analysis
Two timers run on the application for online mode: acquisition and display timer.
The acquisition timer is set for 100 ms intervals and reads the data from the serial port. After fetching thedata from serial port, it parses the stream of bytes to different variables like packet number, heart rate,lead-off status and to the ECG data object containing the digital value of eight leads ECG samples. Thefour non-acquired leads, Lead III, aVR, aVL and aVF data, are derived from Lead I and Lead II as follows:
Lead III = Lead II - Lead I
aVR = - Lead II + 0.5 * Lead III
aVL = Lead I - 0.5 * Lead II
aVF = Lead III + 0.5 * Lead I
The ECG data object for each sample is stored in a queue buffer.
The display timer is set to an interval of 60 ms and is used to plot the ECG wave forms, and update theheart rate and lead-off status information on the screen. This timer is elapsed every 60 ms; in eachelapsed event 15 samples of the leads are plotted on the screen.
5 Installation
5.1 Components and Accessories Required
The following components and accessories are required for the MDK ECG installation.
• C5515 EVM with power supply• ECG front-end board (ECG FE)• Code Composer Studio v3.3• RS232 cable• USB cable• 10 lead ECG patient cable• C5515 DSP application software• PC application software
17SPRAB36B–June 2010 ECG Implementation on the TMS320C5515 DSP Medical Development Kit(MDK)
Copyright © 2010, Texas Instruments Incorporated
JTAG Header J4DB9 J14
Power Jack J7 Power Switch SW4
DB15 P1
Installation www.ti.com
5.2 Hardware Installation1. Mount the ECG front-end board on top of the C5515 EVM at connectors J20, J21 and J22. Ensure that
there is a firm connection between the front-end board and the EVM.
Figure 17. ECG Front-End Mounted on the C5515 EVM
2. Connect the USB cable between the PC and the C5515 EVM for the debug mode of operation.3. Connect the C5515 emulator JTAG cable to the C5515 EVM.4. Connect the serial cable (UART) to the DB9 connector (J13) of the C5515 EVM and the other end to
the serial port of the PC, for viewing the signals on the PC application.5. Connect the ECG cables to DB15 connector P1.6. Connect the other end of the ECG cable (there are 10 leads) to an ECG simulator.7. Power on the system using slide switch SW4 on the C5515 EVM.
NOTE: The ECG simulator has 10 connector points that are assigned to different electrodes, i.e.,RA, RL, LA, etc. Ensure that the ECG leads are connected to the corresponding connectorson the simulator.
5.3 Software Installation
5.3.1 System Requirements
The following installations are required to run the software provided with the MDK ECG kit.
• Code Composer Studio v3.3• bios_5_32_01• Spectrum Digital XDS510 USB driver for Code Composer Studio v_3.3• .NET 2.0 frame work
18 ECG Implementation on the TMS320C5515 DSP Medical Development Kit SPRAB36B–June 2010(MDK)
Copyright © 2010, Texas Instruments Incorporated
www.ti.com Installation
Table 2 explains the content of the CD provided with the MDK ECG kit.
Table 2. Release CD Contents
S Number Directory/Filename Contains
1 ECGSystem_V_5_0 Project source code
2 Output Contains three files:
ECGSystem.out
c5505evm.gel and
C5515 XDS510USB Emulator.ccs
3 PCApplication Executable for PC application
4 BootImageCreation.zip Folder that contains the following files:
bootImage.exe
convertBind0.bat
convertEnc0.bat
convertInsecure.bat
programmer.out
readme.txt
5 Document Contains the following documents:
ReleaseNote.txt
Quick starter guide V6.0 doc
5.3.2 C5515 DSP Software (debug mode) Installation Steps1. Copy the c5505evm.gel file from the CD to <CCS installation dir>/CC/GEL/.2. Copy the ECGSystem directory from the CD to a local directory on the PC where Code Composer
Studio is installed.
5.3.3 C5515 DSP Software (standalone mode ) Installation Steps1. Copy the BootImageCreation.zip file from the CD to a local directory on the PC where Code Composer
Studio is installed. This path needs to be used later for Flashing; ensure that there are no spaces inthe path name.
2. Copy the ECGSystem.out file from the CD to the < BootImageCreation> folder.3. Execute convertInsecure.bat from the <BootImageCreation> folder to create the new
InsecureBootImage.bin file.4. Open Code Composer Studio.5. Power on the C5515 EVM.6. Select Debug → Connect in Code Composer Studio to connect to the C5515 EVM.7. Load programmer.out C5515 EVM from the < BootImageCreation> folder.8. Select Debug → Run in Code Composer Studio.
19SPRAB36B–June 2010 ECG Implementation on the TMS320C5515 DSP Medical Development Kit(MDK)
Copyright © 2010, Texas Instruments Incorporated
Running the Demo Application www.ti.com
9. Enter 241:<BootImageCreation Folder>\InsecureBootImage.bin and press OK in the popup windowshown in Figure 18.
Figure 18. Input Dialog Box
10. Wait until Programming Complete.11. Power off the C5515 EVM and disconnect.
5.3.4 PC Application Installation Steps
Prior to installing the PC application, ensure that .NET 2.0 framework is installed on the system. .NET 2.0redistributable framework can be downloaded from the following URL:http://www.microsoft.com/downloads/details.aspx?familyid=0856eacb-4362-4b0d-8edd-aab15c5e04f5&displaylang=en.
1. Open the PCApplication folder on the CD and double click on C55x ECG Medical DevelopmentKit.msi.
2. Click Next on the welcome screen to continue the installation.3. Browse to the folder where the application is installed. Select the installation mode for Everyone or Self
and click Next.4. Click Next on the Confirmation screen. This installs the application into the specified folder.5. Click Close to complete and exit the installation.
6 Running the Demo Application
The ECG application can be run in two modes: standalone and debug.
• Standalone mode, for running from Flash memory• Debug mode, for loading and debugging using Code Composer Studio
6.1 Running in Standalone Mode1. Complete the installation steps provided in Section 5.3.2. Power on C5515 EVM using slide switch SW4.3. Switch on the ECG simulator to view the ECG signal on the C5515 EVM.
6.2 Running in Debug Mode1. Complete the installation steps provided in Section 5.3.2. Power on the C5515 EVM using slide switch SW4.3. Open Code Composer Studio.4. Click on Debug → Connect in Code Composer Studio to connect to the C5515 EVM.5. Click on Project → Open in Code Composer Studio and select the ECGSystem.pjt file.6. Click on File → Load .out file in Code Composer Studio.7. Execute the application.8. Switch on the ECG simulator to view the ECG signal on the C5515 EVM.
20 ECG Implementation on the TMS320C5515 DSP Medical Development Kit SPRAB36B–June 2010(MDK)
Copyright © 2010, Texas Instruments Incorporated
Lead Status
Displaying Lead
www.ti.com Options and Selections
6.3 Running the PC Application
6.3.1 Online Mode
The following steps are required to view signals in online mode using the PC application:
1. Connect the RS232 cable between the PC COM port and the C5515 EVM.2. Complete the installation steps provided in Section 5.3.3. Open the PC application.4. Select online mode and click OK.5. Select the available COM port and click OK.6. Signals transmitted from the C5515 EVM can be viewed on the PC application.
6.3.2 Offline Mode
The following steps are required to view signals in offline mode stored on the PC using the PC application:
1. Open the PC application.2. Select offline mode and click OK.3. Browse and select the previously saved .wav file and click OK.4. View the static ECG waveforms along with the heart rate and lead-off status on the PC application.
7 Options and Selections
7.1 On the C5515 EVM
7.1.1 ECG Display on the C5515 EVM Side
The ECG display on the LCD screen starts by showing the ECG Monitor followed by lead and heart rate;by default, ECG Lead II is displayed.
SW7 switch on the EVM can be pressed to view one channel after the other. Pressing the switch displaysthe next ECG lead in a cyclic manner: II, I, III, aVR, aVL, aVF, V1, V2, V3, V4, V5 and V6.
The SW8 switch on the EVM can be used for the zoom in and zoom out feature for the ECG waveform.Low, Medium (default) and High are the three levels of zooming provided.
If all 10 leads are connected, a green color dot is displayed at the lead status location on the EVM display.In case any one lead fails, the failed lead name is displayed at the lead status location. If more than onelead off is detected, a red color dot is displayed at the lead status location.
Figure 19. Display on the EVM LCD Screen
21SPRAB36B–June 2010 ECG Implementation on the TMS320C5515 DSP Medical Development Kit(MDK)
Copyright © 2010, Texas Instruments Incorporated
References www.ti.com
7.1.2 PC Application
By default, three leads are displayed simultaneously. The sequence of the leads are I, II, III, aVR, aVL,aVF, V1, V2, V3, V4, V5 and V6. Lead-off status and heart rates are displayed on the screen and thevalues are refreshed once every second. The serial port connection status (RS232) for the device isdisplayed on the status bar.
The following features are available on the PC application.
• Next (up arrow) - This button can be used to view the next three lead wave forms.• Previous (down arrow) - This button can be used to view the previous three lead wave forms.• Scaling on Amplitude - This button can be used to vertically zoom in and zoom out of the ECG
waveform display on the PC application.• Scaling on Time - This button can be used to horizontally zoom in and zoom out of the ECG
waveform display on the PC application.• Start Recording - This can be used to start the recording of the ECG waveform. During recording, this
same button is used for the Stop Recording operation. Note that after the start recording option isselected, the zoom options get disabled.
• Stop Recording - This can be used to stop recording and save the ECG waveform as an .ECG file. Itcan be played back using the PC application in offline mode.
• Freeze - This button can be used to view a static waveform. Particular portions of the waveform can beviewed by moving the Left and Right cursors during the Freeze option.
• Unfreeze - Pressing this button enables the waveform to be in continuous scrolling mode.• Cancel: This can be used to close the form.
8 References• TMS320VC5505 DSP Medical Development Kit (MDK) Quick Start Guide (SPRUGO1)
22 ECG Implementation on the TMS320C5515 DSP Medical Development Kit SPRAB36B–June 2010(MDK)
Copyright © 2010, Texas Instruments Incorporated
LA
LA
RA
RA
RA
LL
LL
LE
AD
_I
LE
AD
_II
-2.5
_V
CC
+2
.5_
VC
C
+2
.5_
VC
C
-2.5
_V
CC
-2.5
_V
CC
+2
.5_
VC
C
-2.5
_V
CC
+2
.5_
VC
C
+2
.5_
VC
C
-2.5
_V
CC
-2.5
_V
CC
+2
.5_
VC
C
+2
.5_
VC
C
-2.5
_V
CC
+2
.5_
VC
C
-2.5
_V
CC
+2
.5_
VC
C
-2.5
_V
CC
LP
F_
I
LP
F_
II
DB
15
_R
A
DB
15_
LA
DB
15
_LL
LA
RA
LL
DE
FIB
RIL
LA
TO
RP
RO
TE
CT
ION
(D
P1)
DE
FIB
RIL
LA
TO
RP
RO
TE
CT
ION
(D
P2)
DE
FIB
RIL
LA
TO
R P
RO
TE
CT
ION
(D
P3)
INS
TR
UM
EN
TA
TIO
NA
MP
LIF
IER
(IA
1)
INS
TR
UM
EN
TA
TIO
NA
MP
LIF
IER
(IA
2)
LO
WP
AS
SF
ILT
ER
(LP
F1)
Fc=
159H
z
LO
WP
AS
SF
ILT
ER
(LP
F2)
Fc=
159H
z
GA
IN8
.35
GA
IN8
.35
DN
I
DN
I
DN
I
DN
I
DN
I
C2
0.1
uF
C5
0.1
uF
C8
0.1
uF
C1
0.1
uF
J3
CO
N3
123
TP
17
C100
22nF
U1
A
OP
A2
335
In-
2
In+
3
Out
1
V+8 V- 4
U3
INA
12
8
Vin
-2
Vin
+3
Vo
6
Rg
11
Rg
28
V+7 V- 4
Re
f
5
C3
0.1
uF
R14
0E
D6
9.1
V
R3
10K
R8
0E
R4
6.8
K
R9
10M
D1
9.1
V
R18
0E
D4
9.1
V
D2
9.1
V
C6
0.1
uF
R19
10M
DS
2M
C0
8010000
R6
0E
D5
9.1
V
D3
9.1
V
U1B
OP
A2
335
In-
6
In+
5
Out
7
V+ V-
R16
22K
C98
22nF
U2
INA
12
8
Vin
-2
Vin
+3
Vo
6
Rg
11
Rg
28
V+7 V- 4
Re
f
5
C7
0.1
uF
R12
6.8
K
DS
3M
C0
8010000
R17
10K
TP
9
R2
22K
TP
8
TP
16
R11
10K
R5
10K
R1
310K
R10
22K
C4
0.1
uF
C99
22nF
DS
1M
C0
8010000
J1
CO
N3
123
R1
10M
J2
CO
N3
123
www.ti.com
Appendix A Front-End Board Schematics
A.1 Front-End Board Schematics
The schematics for the ECG front-end board are shown below:
Figure 20. ECG_I_II
23SPRAB36B–June 2010 ECG Implementation on the TMS320C5515 DSP Medical Development Kit(MDK)
Copyright © 2010, Texas Instruments Incorporated
V1
V2
V3
LE
AD
_V
1
LE
AD
_V
2
LE
AD
_V
3
-2.5
_V
CC
+2
.5_
VC
C
-2.5
_V
CC
-2.5
_V
CC
+2
.5_
VC
C
+2
.5_
VC
C
-2.5
_V
CC
+2
.5_
VC
C
+2
.5_
VC
C
-2.5
_V
CC
-2.5
_V
CC
-2.5
_V
CC
+2
.5_
VC
C
+2
.5_
VC
C
+2
.5_
VC
C
-2.5
_V
CC
+2
.5_
VC
C
-2.5
_V
CC
+2
.5_
VC
C
-2.5
_V
CC
+2
.5_
VC
C
-2.5
_V
CC
LP
F_
V1
V2
LP
F_
V2
DB
15
_V
2
DB
15
_V
1
V1
AV
G_
LA
_R
A_LL
AV
G_
LA
_R
A_LL
LP
F_
V3
DB
15
_V
3
AV
G_
LA
_R
A_LL
V3
DE
FIB
RIL
LA
TO
RP
RO
TE
CT
ION
(D
P4)
DE
FIB
RIL
LA
TO
R P
RO
TE
CT
ION
(D
P5)
INS
TR
UM
EN
TA
TIO
NA
MP
LIF
IER
(IA
3)
LO
WP
AS
SF
ILT
ER
(LP
F3)
Fc=
159H
z
LO
WP
AS
SF
ILT
ER
(LP
F4)
Fc=
159H
z
INS
TR
UM
EN
TA
TIO
NA
MP
LIF
IER
(IA
5)
DE
FIB
RIL
LA
TO
RP
RO
TE
CT
ION
(D
P6)
LO
WP
AS
SF
ILT
ER
(LP
F5)
Fc=
159H
z
INS
TR
UM
EN
TA
TIO
NA
MP
LIF
IER
(IA
4)
GA
IN8
.35
GA
IN8
.35
GA
IN8
.35
DN
I
DN
I
DN
I
DN
I
DN
I
DN
I
R3
710K
U6
INA
12
8
Vin
-2
Vin
+3
Vo
6
Rg
11
Rg
28
V+7 V- 4
Re
f
5
C13
0.1
uF
U4B
OP
A2
335
In-
6
In+
5
Out
7
V+ V-
D8
9.1
V
DS
6M
C0
8010000
U7
A
OP
A2
335
In-
2
In+
3
Out
1
V+8 V- 4
C20
0.1
uF
R35
10M
TP
20
J6
CO
N3
123
DS
4M
C0
8010000
R2
06
.8K
J5
CO
N3
123
C15
0.1
uF
C1
01
22
nF
J4
CO
N3
123
R22
0E
D7
9.1
V
C16
0.1
uF
C1
8
0.1
uF
C9
0.1
uF
C1
0
0.1
uF
R32
22K
R3
66
.8K
TP
19
C1
03
22
nF
R26
0E
R30
0E
TP
12
R27
10M
D12
9.1
V
TP
11
R41
10K
C21
0.1
uF
R25
10K
D10
9.1
V
R2
86
.8K
C19
0.1
uF
R38
0E
DS
5M
C0
8010000
R43
10M
R33
10K
U4
A
OP
A2
335
In-
2
In+
3
Out
1
V+8 V- 4
U8
INA
12
8
Vin
-2
Vin
+3
Vo
6
Rg
11
Rg
28
V+7 V- 4
Re
f
5
R34
0E
R2
110K
R42
0E
TP
10
R24
22K
D11
9.1
V
D9
9.1
V
C102
22nF
C12
0.1
uF
R2
910K
C11
0.1
uF
U5
INA
12
8
Vin
-2
Vin
+3
Vo
6
Rg
11
Rg
28
V+7 V- 4
Re
f
5
TP
18
C17
0.1
uF
C1
4
0.1
uF
R40
22K
Front-End Board Schematics www.ti.com
Figure 21. ECG_LEAD_V1_V2_V3
24 ECG Implementation on the TMS320C5515 DSP Medical Development Kit SPRAB36B–June 2010(MDK)
Copyright © 2010, Texas Instruments Incorporated
V4
V5
V6
LE
AD
_V
4
LE
AD
_V
5
LE
AD
_V
6
-2.5
_V
CC
+2
.5_
VC
C
+2
.5_
VC
C
-2.5
_V
CC
-2.5
_V
CC
+2
.5_
VC
C-2
.5_
VC
C
+2
.5_
VC
C
-2.5
_V
CC
+2
.5_
VC
C
+2
.5_
VC
C
-2.5
_V
CC
+2
.5_
VC
C
-2.5
_V
CC
+2
.5_
VC
C
-2.5
_V
CC
+2
.5_
VC
C
-2.5
_V
CC
+2
.5_
VC
C
-2.5
_V
CC
LP
F_
V4
LP
F_
V5
DB
15
_V
6
V6
DB
15
_V
5
V5
DB
15
_V
4
V4
LP
F_
V6
AV
G_
LA
_R
A_LL
AV
G_
LA
_R
A_LL
AV
G_
LA
_R
A_LL
DE
FIB
RIL
LA
TO
RP
RO
TE
CT
ION
(D
P7)
DE
FIB
RIL
LA
TO
R P
RO
TE
CT
ION
(D
P8)
DE
FIB
RIL
LA
TO
R P
RO
TE
CT
ION
(D
P9)
INS
TR
UM
EN
TA
TIO
NA
MP
LIF
IER
(IA
8)
LO
WP
AS
SF
ILT
ER
(LP
F6)
Fc=
159H
z
LO
WP
AS
SF
ILT
ER
(LP
F7)
Fc=
159H
z
LO
WP
AS
SF
ILT
ER
(LP
F8)
Fc=
159H
z
INS
TR
UM
EN
TA
TIO
NA
MP
LIF
IER
(IA
6)
INS
TR
UM
EN
TA
TIO
NA
MP
LIF
IER
(IA
7)
GA
IN8
.35
GA
IN8
.35
GA
IN8
.35
DN
I
DN
I
DN
I
DN
I
DN
I
DN
I
R4
510K
C2
3
0.1
uF
R6
51
0K
R4
46
.8K
U7B
OP
A2
335
In-
6
In+
5
Out
7
V+ V-
C32
0.1
uF
R57
10K
R6
7
10
M
R5
9
10
M
C2
2
0.1
uF
R51
10M
R5
0
0E
R5
40
E
C2
40
.1u
F
J9
CO
N3
123
D16
9.1
V
R58
0E
TP
14
TP
22
J7
CO
N3
123
R66
0E
C1
05
22
nF
R64
22K
R4
91
0K
U1
0B
OP
A2
335
In-
6
In+
5
Out
7
V+ V-
C29
0.1
uF
R62
0E
C2
7
0.1
uF
TP
13
U11
INA
12
8
Vin
-2
Vin
+3
Vo
6
Rg
11
Rg
28
V+7 V- 4
Re
f
5
U1
0A
OP
A2
335
In-
2
In+
3
Out
1
V+8 V- 4
D15
9.1
V
R46
0E
DS
7M
C0
8010000
C2
6
0.1
uF
C25
0.1
uF
R5
310K
R5
62
2K
D1
4
9.1
V
DS
8M
C0
8010000
C3
1
0.1
uF
C1
04
22
nF
D18
9.1
V
R6
110K
TP
21
DS
9M
C0
8010000
C1
06
22
nF
C28
0.1
uF
R5
26
.8K
C3
0
0.1
uF
U9
INA
12
8
Vin
-2
Vin
+3
Vo
6
Rg
11
Rg
28
V+7 V- 4
Re
f
5
TP
15
D13
9.1
V
R6
06
.8K
D17
9.1
V
J8
CO
N3
123
TP
23
R48
22K
U1
2
INA
12
8
Vin
-2
Vin
+3
Vo
6
Rg
11
Rg
28
V+7 V- 4
Re
f
5
www.ti.com Front-End Board Schematics
Figure 22. ECG_LEAD_V4_V5_V6
25SPRAB36B–June 2010 ECG Implementation on the TMS320C5515 DSP Medical Development Kit(MDK)
Copyright © 2010, Texas Instruments Incorporated
+2
.5_
VC
C
+2
.5_
VC
C
-2.5
_V
CC
-2.5
_V
CC
+2
.5_
VC
C
3.3
_V
CC
-2.5
_V
CC
+2
.5_
VC
C
-2.5
_V
CC
+2
.5_
VC
CS
PI_
OU
T
SP
I_C
LK
LP
F_
V6
LP
F_
IIL
PF
_I
SP
I_S
TA
RT
LP
F_
V2
LP
F_
V5
LP
F_
V4
LP
F_
V3
LP
F_
V1
SP
I_IN
SP
I_D
RD
Y
SP
I_C
S
AD
CV
OLT
AG
ER
EF
ER
EN
CE
AD
C
DN
I
La
yo
ut
no
te:
Mo
ve
C4
4 a
s c
los
e to
U1
3.3
1 &
U1
3.3
0 p
ins a
s p
ossib
le
an
d C
33
clo
se
to
U13.6
pin
R11
41
0K
R7
80
E
Y1
32
.76
8K
Hz
R117
10K
TP
31
R69
0E
C4
80
.1uF
R1
20
0E
R11
90
ER
68
0E
C4
5
1u
F
TP
28
U13
AD
S1
258
AIN
04
AIN
13
AIN
22
AIN
31
AIN
44
8
AIN
54
7
AIN
64
6
AIN
74
5
AIN
84
0
AIN
93
9
AIN
10
38
AIN
11
37
AIN
12
36
AIN
13
35
AIN
14
34
AIN
15
33
GP
IO0
14
GP
IO1
15
GP
IO2
16
GP
IO3
17
GP
IO4
18
GP
IO5
19
GP
IO6
20
GP
IO7
21
DO
UT
24
DR
DY
25
MU
XO
UT
N4
3
MU
XO
UT
P4
4
PW
DN
10
RE
SE
T11
CL
KS
EL
12
SC
LK
22
DIN
23
ST
AR
T2
6
CS
27
AD
CIN
N4
1
AD
CIN
P4
2
XTA
L1
8
XT
AL
29
AVDD6
AVSS5
DGND29
DVDD28
PL
LC
AP
7
CL
KIO
13
VR
EF
N3
0
VR
EF
P3
1
AINCOM32
GND_PAD49
TP
30
R77
0E
C3
5
0.1
uF
R7
90
E
R111
10
K
R7
64
7E
U1
6
RE
F5
025
DN
C1
1
VIN
2
TE
MP
3
GN
D
4
TR
IM5
VO
UT
6
NC
7
DN
C2
8
U14
OP
A3
35
In-
4
In+
3
Out
1
V+5 V- 2
C46
0.1
uF
C1
07
10
uF
R70
0E
R7
3
10
K
R11
21
0K
R11
51
0K
U1
5
OP
A335
In-
4
In+
3
Out
1
V+5 V- 2
TP
32
R71
0E
R11
01
0K
C7
9
10
uF
R8
01
K
C5
0
10
uF
C3
6
0.1
uF
C43
10
uF
R123
0E
R11
85
1E
C3
92
2n
F
C41
0.1
uF
R1
21
0E
R7
4
10
K
TP
29
R122
0E
C4
9
0.1
uF
TP
24
R113
10K
R11
61
0K
C4
04
.7p
F
R75
0E
C4
7
10
0u
F
R8
11
00
EC
42
4.7
pF
R72
0E
C3
4
10
uF
C4
4
0.1
uF
C3
72
.2nF
C3
3
0.1
uF
C38
0.1
uF
Front-End Board Schematics www.ti.com
Figure 23. ECG_ADC
26 ECG Implementation on the TMS320C5515 DSP Medical Development Kit SPRAB36B–June 2010(MDK)
Copyright © 2010, Texas Instruments Incorporated
TH
RS
H_V
OL
RA
'
LA
'
LL'
V1
'
V2
'
V5
'
RA
'
V5
'
V6
'
V6
'
V3
'
V3
'
TH
RS
H_V
OL
V4
'
TH
RS
H_V
OL
TH
RS
H_V
OL
V4
'T
HR
SH
_V
OL
TH
RS
H_V
OL
LA
'
TH
RS
H_V
OL
TH
RS
H_V
OL
TH
RS
H_V
OL
TH
RS
H_V
OL
V2
'
V1
'
LL'
-2.5
_V
CC
3.3
_V
CC
+2
.5_
VC
C
3.3
_V
CC
3.3
_V
CC
3.3
_V
CC
3.3
_V
CC
I2C
_IN
T
I2C
_S
CL
I2C
_S
DA
LA
LL
V1
V2
V3
V4
V5
V6
RA
LE
AD
OF
FD
ET
EC
TIO
NC
OM
PA
RAT
OR
S
I2C
I/O
EX
PA
ND
ER
LO
WP
AS
SF
ILT
ER
SF
c=
15.9
Hz
No
te:
IfL
PF
no
tre
qu
ire
dp
ut
a0
ohm
jum
pe
ro
nth
ere
sis
tor
pa
th a
nd
do
not
po
pu
late
ca
pacitors
C5
1
0.1
uF
TP
27
C56
0.1
uF
R90
100K
TP
41
R8
4
100K
R8
5
10
0K
R8
8
10
0K
R9
5
4.7
K
R1
26
0E
R1
32
0E
R1
24
0E
TP
37T
P34
TP
25
TP
44
C55
1uF
R9
1
10
0K
U1
7
TLV
34
01
IN-
4
IN+
3
OU
T1
VC
C5
GN
D
2
TP
38
R131
0E
TP
33
R129
0E
R1
30
0E
TP
35
R86
100K
R9
3
10
K
C9
1
0.1
uF
TP
39
C90
0.1
uF
C9
7
0.1
uF
U1
8
TLV
34
04
IN1
-2
IN1
+3
IN2
-6
IN2
+5
IN3
-9
IN3
+1
0
IN4
-1
3
IN4
+1
2
VCC4
GND11
OU
T1
1
OU
T2
7
OU
T3
8
OU
T4
14
C89
0.1
uF
R1
27
0E
R1
28
0E
TP
26
U20
TLV
3404
IN1
-2
IN1
+3
IN2
-6
IN2
+5
IN3
-9
IN3
+1
0
IN4
-1
3
IN4
+1
2
VCC4
GND11
OU
T1
1
OU
T2
7
OU
T3
8
OU
T4
14
C54
10nF
TP
40
R8
9
100K
R1
25
0E
C9
6
0.1
uF
C9
5
0.1
uF
C9
4
0.1
uF
U1
9
PC
A9
535
A0
21
A1
2
A2
3
PA
04
PA
15
PA
26
PA
37
PA
48
PA
59
PA
61
0
PA
711
PB
01
3
PB
11
4
PB
21
5
PB
31
6
PB
41
7
PB
51
8
PB
61
9
PB
72
0
VCC24
GND12
INT
1
SC
L2
2
SD
A2
3
R83
100K
_P
OT
R8
7
10
0K
R9
2
10
0K
_P
OT
C9
3
0.1
uF
R8
2
10
0K
C9
2
0.1
uF
C5
2
0.1
uF
R9
4
4.7
K
TP
36
C53
0.1
uF
www.ti.com Front-End Board Schematics
Figure 24. ECG_LEAD_OFF_DET
27SPRAB36B–June 2010 ECG Implementation on the TMS320C5515 DSP Medical Development Kit(MDK)
Copyright © 2010, Texas Instruments Incorporated
BU
FF
_L
A
BU
FF
_R
A
BU
FF
_L
L
RL
D_
VO
L
-2.5
_V
CC
+2
.5_
VC
C
-2.5
_V
CC
+2
.5_
VC
C
-2.5
_V
CC
+2
.5_
VC
C
-2.5
_V
CC
+2
.5_
VC
C
+2
.5_
VC
C
-2.5
_V
CC
AV
G_
LA
_R
A_
LL
LA
RA
LL
DB
15
_R
L
RL
D_
VO
L
WIL
SO
NT
ER
MIN
AL
GA
IN-3
9
RL
DR
IVE
CK
T
DE
FIB
RIL
LA
TO
RP
RO
TE
CT
ION
(D
P10)
BU
FF
ER
FO
RL
A,R
A&
LL
sig
nals
R1
04
10K
U2
3
OP
A335
In-
4
In+
3
Out
1
V+5 V- 2
C65
0.1
uF
TP
43
U24
TLV
2221
IN+
1
IN-
3
OU
T4
V+5 V- 2
R96
390K
C5
8
0.1
uF
R9
71
0K
C6
30
.1uF
C6
4
0.1
uF
R1
03
10K
R1
02
22K
TP
42
C57
0.1
uF
D1
9
9.1
VR
99
10K
R1
33
39
0K
C6
2
0.1
uF
U2
2
TLV
22
21
IN+
1
IN-
3
OU
T4
V+5 V- 2
R1
00
10K
C6
1
0.1
uF
R1
05
10K
D2
0
9.1
V
C59
47pF
DS
10
MC
08
010000
C6
0
0.1
uF
R1
01
10K
R9
81
0K
U2
1
TLV
22
21
IN+
1
IN-
3
OU
T4
V+5 V- 2
Front-End Board Schematics www.ti.com
Figure 25. Right Leg Drive
28 ECG Implementation on the TMS320C5515 DSP Medical Development Kit SPRAB36B–June 2010(MDK)
Copyright © 2010, Texas Instruments Incorporated
BR
D_
DE
T1
BR
D_
DE
T0
BR
D_
DE
T0
BR
D_
DE
T1
3.3
_V
CC
1.8
_V
CC
5_
VC
C
5_
VC
C+
2.5
_V
CC
-5_
VC
C
3.3
_V
CC
3.3
_V
CC
5_
VC
C-5
_V
CC
-2.5
_V
CC
+2
.5_
VC
C
-2.5
_V
CC
DB
15
_V
2D
B1
5_
RA
DB
15_
V3
DB
15
_V
4
DB
15
_V
5
DB
15
_V
6
DB
15
_LL
DB
15
_V
1
I2C
_S
CL
I2C
_S
DA
SP
I_C
LK
I2C
_IN
TS
PI_
OU
TS
PI_
IN
RL
D_
VO
L
DB
15
_LA
DB
15
_R
L
SP
I_C
S
SP
I_S
TA
RT
SP
I_D
RD
Y
CO
NN
EC
TO
R IN
TE
RF
AC
EL
DO
+2
.5V
LD
O -
2.5
V
EC
G E
LE
CT
RO
DE
CO
NN
EC
TO
R
FR
ON
TE
ND
BO
AR
D D
ET
EC
TIO
N M
EC
HA
NIS
M
BR
D_
DE
T1
BR
D_
DE
T0
EC
G
ST
ET
H
SP
O2
11
01
10
-5V
INV
ER
TE
R DN
I
EV
MG
ND
-F
EG
ND
ISO
LA
TIO
N
DE
CO
UP
LIN
G+
2.5
V&
-2.5
V
C7
6
10
0uF
C70
1u
F
L1
BE
AD
L5
3.3
uH
C78
10
0uF
TP
6
J10
PO
WE
R_
CO
NN
1 3 5 7 9
2 4 6 81
0
C82
10uF
C7
1
1u
F
R1
08
10
K
C7
5
0.1
uF
TP
2
R1
07
0E
C69 0.0
1uF
C8
7
10
uF
L4
3.3
uH
TP
1
J13
CO
N3
123
C88
0.1
uF
C7
7
0.1
uF
C8
0
10u
F
C8
4
10
uF
C6
8 2.2
uF
C72 2.2
uF
R109
0E
L3
3.3
uH
C8
3
10
uF
C73 0.0
1uF
TP
5
C74 2.2
uF
U26
TP
S6
04
03
IN2
OU
T1
CF
LY
-
3
CF
LY
+
5
GN
D
4
P1
CO
NN
EC
TO
RD
B15
81
5 71
4 61
3 51
2 411 3
10 2 9 1
C66 0.1
uF
C67
1uF
L2
3.3
uH
TP
4
TP
7
U27
TP
S7
23
25
IN2
EN
3
GND1
NR
4
OU
T5
C81
10uF
C8
5
10
uF
R1
06
10K
U25
TP
S7
30
25
IN1
EN
3
GND2
NR
4
OU
T5
J11
DA
TA
_C
ON
N
1 3 5 7 911
13
15
17
19
2 4 6 8 10
12
14
16
18
20
TP
3
C86
10uF
J1
2
DU
MM
Y_
CO
NN
1 3 5 7 9 11
13
15
17
19
2 4 6 81
01
21
41
61
82
0
www.ti.com Front-End Board Schematics
Figure 26. PWR_CONN_INTRFCE
29SPRAB36B–June 2010 ECG Implementation on the TMS320C5515 DSP Medical Development Kit(MDK)
Copyright © 2010, Texas Instruments Incorporated
www.ti.com
Appendix B Front-End Board BOM
B.1 Front-End Board BOM
Table 3 provides the bill of material for the digital stethoscope front-end board.
Table 3. Bill of Material
Ite Quantitm y Value Reference Description Part Number Manufacturer DNI
1 17 0.1 mF C1,C4,C9,C12,C17, CAP CERM 0.10 mF 50 V 5% 08055C104JAT2A AVX DNIC20,C25,C28,C89, 0805 SMD CorporationC90,C91,C92,C93,C94,C95,C96,C97
2 49 0.1 mF C2,C3,C5,C6,C7, CAP CERM 0.10 mF 50 V 5% 08055C104JAT2A AVXC8,C10,C11,C13, 0805 SMD CorporationC14,C15,C16,C18,C19,C21,C22,C23,C24,C26,C35,C36,C38,C41,C44,C46,C27,C29,C30,C31,C32,C33, 48,C49,C51,C52,C53,C56,C64,C65,C66,C75,C77,C88 C57,C58,C60,C61,C62,C63
3 5 10 mF C34,C43,C50,C79, C107 CAP TANT LOESR 10 mF 16 V TPSB106K016R080 AVX10% SMD 0 Corporation
4 1 2.2 nF C37 CAP CERM 2200 pF 5% 50 V 08055A222JAT2A AVXNPO 0805 Corporation
5 1 22 nF C39 CAP CER 22000 pF 50 V X7R 08055C223J4T2A AVX0805 Corporation
6 2 4.7 nF C40,C42 CAP CER 4.7 pF 50 V NPO 0805 08055A4R7BAT2A AVXCorporation
7 5 1 mF C45,C55,C67,C70, C71 CAP CERM 1.0 mF 10% 25 V 08053C105KAZ2A AVXX7R 0805 Corporation
8 3 100 mF C47,C76,C78 CAP ELECT 100 mUF 16 V TK EEE-TK1C101P Panasonic-ECGSMD
9 1 10 nF C54 CAP CER 10000 pF 16 V NPO 0805YA103JAT4A AVX0805 Corporation
10 13 47 pF C59 CAP CERM 47 pF 5% 50 V NPO 08055A470JAT2A AVX0805 Corporation
11 3 2.2 mF C68,C72,C74 CAP CER 2.2 mUF 25 V X7R 08053C225MAT2A AVX0805 Corporation
12 2 0.01 mF C69,C73 CAP CERM 0.01 10% 50 V X7R 08055C103KAT2A AVX0805 Corporation
13 8 10 mF C80,C81,C82,C83,C84, CAP CER 10 mF 16 V X5R 0805 EMK212BJ106KG-T Taiyo YudenC85, C86,C87
14 9 22 nF C98,C99,C100,C101,C1 CAP CER 22000 pF 50 V X7R 08055C223J4T2A AVX02, 0805 CorporationC103,C104,C105,C106
15 10 MC08010000 DS1,DS2,DS3,DS4,DS5, Neon lamp MC08010000 MulticompDS6,DS7,DS8,DS9,DS10
16 20 9.1 V D1,D2,D3,D4,D5,D6,D7, DIODE ZENER 1W 9.1 V PTZTE259.1B ROHMD8, SOD-106D9,D10,D11,D12,D13,D14,D15,D16,D17,D18,D19,D20
17 10 CON3 J1,J2,J3,J4,J5,J6,J7, J8, CONN HEADER 3POS .100 22-28-4030 MolexJ9,J13 VERT TIN
18 1 POWER_CONN J10 Elevated Female Header 5x2 BB02-KD102-T03- Gradconn100000
19 1 DATA_CONN J11 Elevated Female Header 10x2 BB02-KD202-T03- Gradconn100000
30 ECG Implementation on the TMS320C5515 DSP Medical Development Kit SPRAB36B–June 2010(MDK)
Copyright © 2010, Texas Instruments Incorporated
www.ti.com Front-End Board BOM
Table 3. Bill of Material (continued)
Ite Quantitm y Value Reference Description Part Number Manufacturer DNI
20 1 DUMMY_CONN J12 Elevated Female Header 10x2 BB02-KD202-T03- Gradconn100000
21 1 BEAD L1 FERRITE BEAD 470 Ω 0805 BK2125HM471-T Taiyo Yuden
22 4 3.3 mH L2,L3,L4,L5 INDUCTOR POWER 3.3 mH 1.3A VLF4012AT- DK CorporationSMD 3R3M1R3
23 1 CONNECTOR P1 CONN D-SUB RCPT R/A 15POS 745782-4 TycoDB15 PCB AU Electronics
24 9 10M R1,R9,R19,R27,R35,R4 RES 10.0MΩ 1/8W 1% 0805 CRCW080510M0FK Vishay3, R51,R59,R67 SMD EA
25 10 22K R2,R10,R16,R24,R32,R RES 22KΩ 1W 5% 2512 SMD CRCW251222K0JN Vishay40,R48,R56,R64,R102 EG
26 10 10K R3,R11,R17,R25, RES 10KΩ 1/2W 5% 2010 SMD CRCW201010K0JN VishayR33,R41, EFR49,R57,R65,R101
27 8 6.8K R4,R12,R20,R28,R36, High Precision Chip Resistor Y162406K8000T9R VishayR44, R52,R60 6.8KΩ
28 15 10K R5,R13,R21,R29,R37, High Precision Chip Resistor Y162410K0000T9R VishayR45,R53,R61,R97, R98, 10KΩR99,R100,R103,R104,R105
29 38 0E R6,R8,R14,R18,R22, RES 0.0 Ω 1/8W 5% 0805 SMD CRCW08050000Z0 VishayR26,R30,R34,R38, EAR42,R46,R50,R54,R58,R62,R66,R68,R69,R70,R71,R72,R75,R77,R78, R79,R119,R120,R121,R122,R124,R125,R126,R127,R128,R129,R130,R131, R132
30 11 10K R73,R74,R93,R110, RES 10.0KΩ 1/8W 1% 0805 SMD CRCW080510K0FK VishayR111,R112,R113, EAR114,R115,R116, R117
31 1 47E R76 High Precision Chip Resistor 47 Y162447R0000T9R VishayΩ
32 1 1K R80 RES 1.00KΩ 1/8 W 1% 0805 CRCW08051K00FK VishaySMD EA
33 1 100E R81 High Precision Chip Resistor 100 Y1624100R000T9R Vishaym
34 9 100K R82,R84,R85,R86, RES 100KΩ 1/8W 1% 0805 SMD CRCW0805100KFK VishayR87,R88,R89,R90, R91 EA
35 2 100K_POT R83,R92 POT 100KΩ 4MM SQ CERMET 3314G-1-104E Bourns IncSMD
36 2 4.7K R95,R94 RES 4.70KΩ 1/8W 1% 0805 SMD CRCW08054K70FK VishayEA
37 2 390K R96,R133 High Precision Chip Resistor TNPW0805390KBY Vishay390KΩ TA
38 2 10K R108,R106 RES 10.0KΩ 1/8W 1% 0805 SMD CRCW080510K0FK Vishay DNIEA
39 3 0E R107,R109,R123 RES 0.0 Ω 1/8W 5% 0805 SMD CRCW08050000Z0 Vishay DNIEA
40 1 51E R118 RES 51 Ω 1/8W 5% 0805 SMD CRCW080551R0JN VishayEA
41 4 OPA2335 U1,U4,U7,U10 IC OP AMP CMOS SGL SPLY OPA2335AIDGKT TI DNI8-MSOP
42 8 INA128 U2,U3,U5,U6,U8,U9,U11 IC LOW PWR INSTR AMP INA128UA TI, U12 8-SOIC
43 1 ADS1258 U13 IC ADC 24 BIT 125 ksps 48-QFN ADS1258IRTCT TI
44 3 OPA335 U14,U15,U23 IC OP AMP CMOS SGL SPLY OPA335AIDBVT TISOT-23-5
45 1 REF5025 U16 IC PREC V-REF 2.5 V LN REF5025AID TI8-SOIC
31SPRAB36B–June 2010 ECG Implementation on the TMS320C5515 DSP Medical Development Kit(MDK)
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Front-End Board BOM www.ti.com
Table 3. Bill of Material (continued)
Ite Quantitm y Value Reference Description Part Number Manufacturer DNI
46 1 TLV3401 U17 IC OUT COMPARATOR TLV3401IDBVR TINANOPWR SOT23-5
47 2 TLV3404 U18,U20 COMPARATOR LW POWER R-R TLV3404IDR TI14-SOIC
48 1 PCA9535 U19 IC REMOTE 16-BIT I/O EXP PCA9535PWR TI24-TSSOP
49 3 TLV2221 U21,U22,U24 IC RAIL-TO-RAIL OP AMP TLV2221CDBVR TISOT-23-5
50 1 TPS73025 U25 IC LDO REG HI-PSRR 2.5 V TPS73025DBV TISOT23-5
51 1 TPS60403 U26 IC UNREG CHRG PUMP V INV TPS60403DBVT TISOT23-5
52 1 TPS72325 U27 IC LDO REG 200MA 2.5 V TPS72325DBVT TISOT23-5
53 1 32.768KHz Y1 CRYSTAL 32.7680 KHz 12.5 pF C-001R EpsonCYL 32.7680K- Toyocom
A:PBFREE Corporation
32 ECG Implementation on the TMS320C5515 DSP Medical Development Kit SPRAB36B–June 2010(MDK)
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Appendix C Sensors and Accessories
C.1 ECG Cable Details
Figure 27. ECG Cable Details
Cable details: 10 lead ECG cable for philips/hp -snap, button (Part No: 010302013)http://www.biometriccables.com/index.php?productID=692
Cable details: 10 lead ECG cable for philips/hp -Clip-on type (P/n-010303013A)http://www.biometriccables.com/index.php?productID=693
Other compatible cables for MDK: HP/Philips/Agilent Compatible 10 Lead ECG cable
C.2 ECG Sensor
Sensor details: Disposable Electrodes - Medico Lead - Lok
Vendor name: Medico Electrodes International Link : http://www.medicoleadlok.com/
Other compatible parts: Any Ag/AgCl solid gel ECG electrode on the market.
33SPRAB36B–June 2010 ECG Implementation on the TMS320C5515 DSP Medical Development Kit(MDK)
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Appendix D MEDICAL DEVELOPMENT KIT (MDK) WARNINGS, RESTRICTIONS ANDDISCLAIMER
Not for Diagnostic Use: For Feasibility Evaluation Only in Laboratory/Development Environments.
The MDK may not be used for diagnostic purposes.
This MDK is intended solely for evaluation and development purposes. It is not intended for diagnostic useand may not be used as all or part of an end equipment product.
This MDK should be used solely by qualified engineers and technicians who are familiar with the risksassociated with handling electrical and mechanical components, systems and subsystems.
Your Obligations and Responsibilities.
Please consult the TMS320VC5505 DSP Medical Development Kit (MDK) Quick Start Guide (SPRUGO1)prior to using the MDK. Any use of the MDK outside of the specified operating range may cause danger tothe users and/or produce unintended results, inaccurate operation, and permanent damage to the MDKand associated electronics. You acknowledge and agree that:
• You are responsible for compliance with all applicable Federal, State and local regulatory requirements(including but not limited to Food and Drug Administration regulations, UL, CSA, VDE, CE, RoHS andWEEE,) that relate to your use (and that of your employees, contractors or designees) of the MDK forevaluation, testing and other purposes.
• You are responsible for the safety of you and your employees and contractors when using or handlingthe MDK. Further, you are responsible for ensuring that any contacts or interfaces between the MDKand any human body are designed to be safe and to avoid the risk of electrical shock.
• You will defend, indemnify and hold TI, its licensors and their representatives harmless from andagainst any and all claims, damages, losses, expenses, costs and liabilities (collectively, "Claims")arising out of or in connection with any use of the MDK that is not in accordance with the terms of thisagreement. This obligation shall apply whether Claims arise under the law of tort or contract or anyother legal theory, and even if the MDK fails to perform as described or expected.
WARNINGIf defibrillator is used for development purposes, use of medicalgrade EVM input power supply (Accessory Part Number: SL PowerAULT Model MW173KB0503F01) is strongly recommended. Use ofthe Isolator (Accessory Part Number: MOXA Model Name: TCC-82)that isolates the MDK from the PC is also strongly recommended.These accessories provide additional supplemental protection todevelopment users from high voltages that may be present whenintroducing defibrillator voltages during development simulation.There may also be other voltage transients sourced from thedefibrillator to accompanying interface hardware such as apersonal computer when used in conjunction with the ECG/EVMdevelopment hardware.
WARNINGTo minimize risk of electric shock hazard, use only the followingpower supplies for the EVM module: Medical DevelopmentApplications: SL Power AULT Model MW173KB0503F01.
34 ECG Implementation on the TMS320C5515 DSP Medical Development Kit SPRAB36B–June 2010(MDK)
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