iqs128ev04

IQ Switch®

ProxSense® Series

Copyright © Azoteq (Pty) Ltd 2012. IQS156/58EV02 Evaluation Kit User Manual of 4 All Rights Reserved. Revision 1.1 December 2012

IQS128 Long Range Proximity Kit IQ Switch® - ProxSense® Series

The IQS128 ProxSense® IC is a stand-alone capacitive sensor controller with high sensitivity and signal to noise ratio for long range proximity detection.

1. Usage The IQS128EV04 Kit comes with two parts, the base board and the module plugin board. The plugin board should have the indented side pointing towards the electrode of the base board when connected.

Operation:

1) Plug in module board to base board;

2) Plug baseboard to USB power source;

3) Move hand towards electrode to observe Proximity Threshold 1(bottom LED);

4) Move hand closer to observe Proximity Threshold 2

(top LED, can be adjusted to be a touch threshold).

2. Absolute Maximum Specifications Operating temperature -40°C to 85°C Supply Voltage (VDDHI – Vss) 6.5V Maximum pin voltage (OUT, CTRL) VDDHI + 0.5V Pin voltage (Cx) 2.5V Minimum pin voltage (VDDHI, VREG, OUT, CTRL, Cx) VSS - 0.5V Minimum power-on slope 100V/s ESD protection (VDDHI, VREG, VSS, OUT, CTRL, Cx) 4kV

3. Features • Features DYCAL™ Intelligent Hysteresis • Internal Capacitor Implementation (ICI) • Automatic Antenna Tuning Implementation (Auto-ATI) • Supply voltage: 2.95V to 5.5V • Minimal external components • 1-Wire open drain data streaming • Advanced on-chip digital signal processing • User selectable (OTP):

o External synchronization control or o External control over filter operation o I/O Sink or Source selection o Time-out for stuck key o Proximity and Touch sensitivity selections

IQS128 TSOT23-6

IQ Switch®

ProxSense® Series


• 6 pin TSOT23-6 • Touch: 6 mm plastic, 10 mm glass • Proximity: 25cm

IQS128EV04 Kit includes:

• 1 x Module PCB with IQS128 (TSOT23-6) • 1 x Base board with 70 x 80 mm electrode for long range proximity detection

4. Applications • Occupancy sensors • SAR qualification for Tablet PC’s • On-ear detection for mobile phones • 3D glasses • Personal Media Players • White goods and appliances • Human Interface Devices • Proximity activated backlighting • Any applications where a touch and proximity condition can prevail for a extended period of

time with or without a host controller

5. Advantages • Allows for sensor drift in periods of activation and non-activation • Improved digital filtering to reduce external noise • Minimal power consumption (<7µA) when in standby mode (Charge Halt).

6. Device The IQS128 is a single channel capacitive proximity and touch device which employs an internal voltage regulator and reference capacitor (Cs).

The IQS128device has a dedicated pin for the connection of a sense antenna (Cx) and output pin for proximity and touch events on OUT. The polarity of the output pins can be configured. A 1-wire open drain data streaming protocol is implemented for debugging purposes.

Special device configuration can be done by setting one time programmable (OTP) options.

The device automatically tracks slow varying environmental changes via various signal processing algorithms and has an Automatic Antenna Tuning Implementation (Auto-ATI) algorithm to calibrate the device to the sense antenna.

DYCAL™ (Dynamic Calibration) is a special form of hysteresis that can track slow varying environmental change even while the sensor is in a touch state.

The charge transfer method of capacitive sensing is employed on the IQS128. (The charge transfer principle is thoroughly described in the application note: “AZD004 - Azoteq Capacitive Sensing”.)

IQ Switch®

ProxSense® Series


7. IQS128 on AZP128EV04

8. Base PCboard(AZP128EV04)

9. Plugin PCboard(AZP242A02)

CX TOUT

VREG C2 1uF

GND

C4 100pF

R3 470R

TOUT TOUT

R2 2K0

CX

POUT POUT

R1 2K0

VDDHI

POUT 3

TOUT 1

VREG 4

CX 6 VSS 2 VDDHI 5

U1

IQS128 TSOT23-6

VDDHI

C1 1uF C3

100pF

POUT GND VDDHI

Sense Electrode

Plugin area for AZP242A02 USB Power

IQ Switch®

ProxSense® Series


Contact Information Please visit www.azoteq.com for comprehensive datasheets, application notes, reference designs and a list of distributors for your region.

CTRL/POUT

GND

TOUT

VDDHI

CX/Sense Plate

iqs128ev04

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