May 2006 Rev 1 1/17

UM0242User manual

USB Power Switch demonstrator kit

IntroductionThe objective of this demonstrator is to display to the user the features and capabilities of the USB Power switches (ST204x and ST205x) developed by STMicroelectronics using a Windows® -based host software application and one of several USB low-speed microcontrollers from ST acting as a peripheral device. The host software and the ST7 source code provides a clear picture of the power switch capabilities. The USB communication between host and the device is done through a HID class based protocol developed specially for demonstration board applications .

The demonstration board incorporates microcontroller, programmable voltage regulator, Mosfets, switches and various resistive networks. The onboard regulator can be configured to supply various voltages by selecting appropriate resistance from the resistive network present at the adjust pin of the regulator. Different voltages and loads can be selected from the PC software as well as through switches present on the board. LEDs are provided on the board to indicate the various combinations of input voltage and load applied to the power switch. The board has an ICC connector to program the microcontroller Flash memory. An external 12V charge pump is also provided on the board to allow the user to perform In-Application Programming (IAP) of the microcontroller embedded Flash program memory. Any type of real load (e.g. USB speakers) can be powered from this board by plugging in the connector present on the board.

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Contents UM0242

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Contents

1 Getting started . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

1.1 System requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

1.2 Package contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

1.3 Software installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

1.4 Hardware installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

2 Running the USB power switch kit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

2.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

2.2 USBPS GUI description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

2.3 Communication with the demonstration board . . . . . . . . . . . . . . . . . . . . . 11

2.4 Programming the MCU Flash memory . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

2.5 Plugging of real load . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

2.6 Demonstration board schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

3 Bill of materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

4 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

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UM0242 List of figures

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List of figures

Figure 1. Power switch board layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6Figure 2. Enumeration result . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7Figure 3. USBPS_GUI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8Figure 4. Device database window . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9Figure 5. Sampling information window . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10Figure 6. Calibration Values window . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10Figure 7. Board schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

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List of tables UM0242

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List of tables

Table 1. Jumper settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12Table 2. Switches configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12Table 3. LEDs configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12Table 4. Bill of materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

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UM0242 Getting started

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1 Getting started

1.1 System requirementsIn order to use the USB Power Switch Demonstrator with the Windows® operating system, a recent version of Windows, such as Windows 98, Windows 2000 or Windows XP must be installed on the PC.

The version of the Windows OS installed on your PC may be determined by clicking on the “System” icon in the Control Panel.

1.2 Package contentsThe USB Evaluation Kit includes the following items:

● Hardware content

– One USB Power Switch demonstration board

● Software content

– PC executable software (USBPS_GUI) for using the demonstration board

– PC executable software (DFUGUI) for upgrading firmware through USB using DFU feature.

– ST7 firmware (C source code) for the ST72F62.

● Documentation

– User Manual for using the Power Switch demonstrator kit.

– ST7262 Datasheet.

– USB power switches datasheets.

– Usage document for using DFUGUI.

1.3 Software installationRun the setup file to install USBPS_GUI and follow the on-screen prompts to complete the installation.

1.4 Hardware installationFigure 1 shows a photograph of the demonstration board with all the components usable on this board. The schematic of the demonstration board is given in Figure 7.

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Figure 1. Power switch board layout

1.4.1 Power supply

The microcontroller is directly powered by the USB Connector (bus-powered). While the rest of the circuit needs a 10V/3A supply which has to be plugged in the connectors of the board after inserting the USB cable.

ICCConnector

Regulator

Power

Micro-

Loads

MOSFETs

Charge Pump

controller

Switch

CON2CON3

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2 Running the USB power switch kit

2.1 IntroductionThis USB Power Switch kit consists of two main parts: an USBPS_GUI running on PC and a Demonstration board. Communications between the PC and the ST7 board are done through different USB pipes:

– Control IN and OUT during the enumeration with the bi-directional endpoint 0

– Interrupt IN from endpoint 1 for data transferred from ST7 to PC.

– Interrupt OUT to the endpoint 2 for the data transferred from PC to ST7.

Figure 2. Enumeration result

By starting the USBPS_GUI on the PC, you get a graphical interface (Figure 3) for controlling the demonstration board. This PC software is used to issue various commands and to control data transfers between the PC and the ST7 peripheral.

2.2 USBPS GUI description

2.2.1 Main window

The USBPS GUI enables the user to configure the parameters shown in Figure 3.

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Figure 3. USBPS_GUI

Input parameters

● Device Select: Click the drop-down menu to select the correct board from the list of available devices.

● Load current: Select the correct load to apply at the switch output: 100mA, 500mA, 1A or 2A. Larger loads can be applied by changing the load resistance R37 with the required load on the demonstration board.

● Input voltage: Select the correct input voltage for the switch: 4.4V, 4.75, 5.0V or 5.25V.

● Under Voltage: Select the under voltage protection. When ON, a 1.2V supply is applied at the switch input. At this input supply level, the Power Switch output will be zero, displaying the cut off capability of the Power Switch at low input voltages.

● Short Circuit: Select ON to enable a short-circuit at the Power Switch output. A graph of short circuit current versus time will be plotted in a separate window.

● Power Switch: Select Enable or Disable option on the GUI to control the voltage on the Enable pin of the Power Switch.

● Plot Reaction: Select Turn ON/OFF to display in a separate window the plotting of a graph of the output rise time and fall time, respectively, of the Power Switch.

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Output parameters

● Input Voltage, Output Voltage and Load Current windows display the current parameter settings.

● Over Current: This LED is ON when a current larger than device rating is flowing through the device.

Device status

● Connected: This LED is ON when an HID device is connected to the Power Supply board via a USB cable.

2.2.2 Device Database window

The Device Database window (Figure 4) enables the user to register a new pin-compatible power switch device by entering the device name, maximum current range, short-circuit current and Enable signal polarity parameters.

Figure 4. Device database window

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2.2.3 Sampling Information window

The Sampling Information window (Figure 5) enables the user to update the sampling time and number of samples parameters for short-circuits and to enable the display of graphs separately.

Figure 5. Sampling information window

2.2.4 Calibration Values window

The Calibration Values window (Figure 6) is used for changing the multiplication factors used for calibrating the ADC values.

Figure 6. Calibration Values window

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2.3 Communication with the demonstration board

2.3.1 PC software control of the demonstration board

To use the USBPS GUI, select a particular device (i.e. Power Switch as on the demonstration board) from Device Select drop box. Selection of an incorrect Power Switch will lead to incorrect results.

Note: If the correct device is not listed in the drop box, enter the required information in the Device Database window as described in Section 2.2.2: Device Database window.

Use the various parameters described in Section 2.2: USBPS GUI description to look into the features of the USB Power Switch.

2.3.2 Manual control of the demonstration board

This Power Switch Demonstration board can also work without the PC software. Different voltages and loads can be selected using switch S2 & S3 respectively. Pressing S3 again and again will increment the voltage in the above mentioned steps and after 5.25V under voltage (i.e. 1.2V) is selected. After under voltage the next state is 4.4V. Similarly load at the output can be varied using S2. In default state of the board, 5V is present at Power Switch input and 100 mA load at the output.

2.3.3 Display of demonstration board state

Real time values of input voltage, output voltage of the Power Switch and its load current are incremented every second in the GUI display window. In case of over current through the switch, indication will be given on the GUI through over current LED.

2.4 Programming the MCU Flash memory

2.4.1 Programming through ICC

To program the MCU through ICC, plug in the ICC cable and put jumper JP4 in 2-3 position as described in Table 1. In the firmware two S19 files are available one for sector0 (0xF000-0xFFFF) and other for Sectors 1 and 2 (0xC000-0xEFFF). Program these files in the respective sectors. The board has been tested with the INDART kit.

2.4.2 Upgrading firmware through DFU

Device firmware upgrade (DFU) is used to reprogram Sectors 1 and 2 through USB cable without reprogramming Sector 0. Use the DFUGUI to upgrade Sectors 1 and 2. Refer to help manual of ST7 DFUGUI for a complete description.

2.4.3 Entering DFU mode

Press and hold the switch S3 and reset the board (by pressing S1). The board will now go into DFU mode. Now, Sectors 1 an 2 can be upgraded. To exit DFU mode, reset the board.

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2.5 Plugging of real loadAny type of USB real load can be powered from this board. First plug the USB cable into connector CON2 then plug the load into connector CON3.

Table 1. Jumper settings

Jumper No. Jumper Location Jumper Setting

JP1Connector between o/p of power switch and load.

This jumper should always be present on the board during normal operation. If reading of load current with multimeter is desired then only, jumper should be removed and ammeter should be inserted.

JP2Connector between adjust pin of regulator and ground.

This jumper should not be present on the board else it will cause undervoltage situation. It is kept for future.

JP3Connector between ICCLK pin and OSC1 pin of microcontroller

This jumper is useful only in ICC mode. Don't put this jumper ON if the crystal is present.

JP4Connetor Between 12V input and Vpp pin of the microcontroller.

It’s a 3 pin jumper and useful in ICC and DFU mode. Short its 2-3 pins in ICC mode and 1-2 pins in DFU mode. Through this jumper 12V is supplied to the Vpp pin of the MCU.

Table 2. Switches configuration

Switch No. Switch Use

SW1 Reset

SW2 Load Switching

SW3 Input voltage switching & entry in DFU mode

Table 3. LEDs configuration

LED No LED Color Glowing Condition

LED1 Red Over Current through Power Switch

LED2 Green Presence of 4.4V at Power Switch input.

LED3 Green Presence of 4.75V at Power Switch input.

LED4 Green Presence of 5.0V at Power Switch input.

LED5 Green Presence of 5.25V at Power Switch input.

LED6 Red Under Voltage Condition

LED7 Yellow 400mA Load LED

LED8 Yellow 600mA Load LED

LED9 Yellow 100mA Load LED

LED10 Yellow 2A Load LED

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2.6 Demonstration board schematic

Figure 7. Board schematic

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R15 10k

R27 33

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R37 1E

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R40 5E

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R29 330E

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R53 10k

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R34 0

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Bill of materials UM0242

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3 Bill of materials

Table 4. Bill of materials

Index Qty ReferenceValue/Generic part number

Package Manufacturer

Manifacturer‘s ordering

code/orderable part number

1 1 R1 1.5K SMD 0805 Any

2 20

R2, R3, R4, R5, R6, R7, R8, R9, R10, R11, R12, R43, R44, R45, R46, R47, R48, R49, R50, R51

47K SMD 0805 Any

3 1 R13 470E SMD 0805 Any

4 11R14, R15, R16, R17, R18, R19, R20, R42, R52, R53, R34A

10K SMD 0805 Any

5 10R21, R22, R23, R24, R25, R26, R27, R28, R29, R30

330E SMD 0805 Any

6 1 R35A 1K SMD 0805 Any

7 1 R33 1K5 SMD 0805 Any

8 1 R32 4K7 SMD 0805 Any

9 1 R35 5K1 SMD 0805 Any

10 1 R32A 18K SMD 0805 Any

11 1 R34 0E SMD 0805 Any

12 1 R41 2K2 SMD 0805 Any

13 1 R36 0.1E, 5W LeadedRS Components

RS199-6378

14 2 R31, R37 1E, 5W Leaded Any

15 1 R40 5E ,5W Leaded Any

16 1 R39 10E, 5W Leaded Any

17 1 R38 50E, 2 W Leaded Any

18 3 C1, C11, C12 4.7uF, 25V RB-.2/.4 Any

19 4 C2, C3, C4, C5 10uF, 25V RB-.2/.4 Any

20 1 C6 10nF SMD 0805 Any

21 2 C7, C8 33pF SMD 0805 Any

22 2 C9, C10 220nF Leaded Any

23 2 C13, C14 100nF SMD 0805 Any

24 4 LD2, LD3, LD4, LD5Thru Hole LED 3mm -Green

Any

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UM0242 Bill of materials

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25 4 LD7, LD8 ,LD9, LD10Thru Hole LED 3mm -Yellow

Any

26 2 LD1, LD6Thru Hole LED 3mm -Red

Any

27 1 U1 LM238 TO-3 ST LM238K

28 1 U2

ST2042BDR, or ST2044BDR, or ST2052BDR, or ST2054BDR

SO-8 or SO-16 ST

ST2042BDR, or ST2044BDR, or ST2052BDR, or ST2054BDR

29 1 U3 ST72F621J4 TQFP-44 ST ST72F621J4T1

30 5 U4, U5, U6, U7, U8 STS8DNH3LL SO-8 ST STS8DNH3LL

31 1 U9 ST662A SO-8 ST ST662ABD-TR

32 1 Q1 BC557 or BC558 TO-92A Any

33 2 D1, D2 IN4148 DO-35 Any

34 3 S1, S2, S3 Push Button Any

35 2 CON1, CON2 USB-B-TYPE USB-B Kycon KUSB-BS-1-N-BLK

36 1 CON3 USB-A-TYPE USB-A Kycon KUSB-AS-1-N-BLK

37 1 CON4 HEADER 5X2 IDC-10B Any

38 1 Y1 12MHz Crystal XTAL-3 Any

39 1 HS1 Heat Sink HS-TO3 Any

40 1 X1 VCC12V RS738-547 FARNELL 150-039

41 1 X2 GND RS738-547 FARNELL 150-040

42 4 J1, J2, J3, J4 CON11 SIP-11 Any

43 2 J5, J6 CON8 SIP-8 Any

44 3 JP1, JP2, JP3 CON2 SIP-2 Any

Table 4. Bill of materials (continued)

Index Qty ReferenceValue/Generic part number

Package Manufacturer

Manifacturer‘s ordering

code/orderable part number

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Revision history UM0242

16/17

4 Revision history

Revision history

Date Revision Changes

19-May-2006 1 Initial release.

www.BDTIC.com/ST

UM0242

17/17

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1 Getting started1.1 System requirements1.2 Package contents1.3 Software installation1.4 Hardware installation1.4.1 Power supply

2 Running the USB power switch kit2.1 Introduction2.2 USBPS GUI description2.2.1 Main window2.2.2 Device Database window2.2.3 Sampling Information window2.2.4 Calibration Values window

2.3 Communication with the demonstration board2.3.1 PC software control of the demonstration board2.3.2 Manual control of the demonstration board2.3.3 Display of demonstration board state

2.4 Programming the MCU Flash memory2.4.1 Programming through ICC2.4.2 Upgrading firmware through DFU2.4.3 Entering DFU mode

2.5 Plugging of real load2.6 Demonstration board schematic

3 Bill of materials4 Revision history