Rainbow Electronics AT42QT4120 User Manual

Features

Y2A

Y1A

Y0A

RST

SCL

SDA

N/C

Y2B

Vss

VREF

SMPX0X1X2X3

N/C

CHANGE

Vss

Vdd

Vss

Vdd

N/C

Vdd

Vss

Y0B

Y1B

817

282726

AT42QT4120

Vdd

• QField

• Techn ology:

• Panel Materials:

• Adjacent Metal:

• Panel Thickness:

• Interface:

• Moisture Tolerance:

• Power:

• Packages:

• Signal Processing:

• Applications:

• Patents:

™

Touchscreen:

– Up to 3.4 inches diagonal screen size supported

– Patented spread-spectrum charge-transfer (transverse mode)

– Plastic, glass, composites, painted surfaces (low particle density metallic paints

possible)

– Compatible with grounded metal immediately next to sensing channels

– 1 to 2 mm glass, 0.5 to 1.5 mm plastic

–I2C-compatible slave mode, 100 kHz or 400 kHz

– Best in class

– 1.8V to 5.5V (2.5V to 5.5V in high speed mode)

– 32-pin 5 x 5 mm MLF RoHS compliant

– Self-calibration, auto drift compensation, noise filtering

– Mobile electronics, terminals, appliances

– QMatrix™ (patented Charge-transfer method) – QField (patented Charge-transfer method, patent-pending QField optimized for

one-layer sensor element designs)

QField™ 10-bit Touchscreen Sensor IC

AT42QT4120

Summary

1. Pin-out and Pin Listing Descriptions

1.1 Device Pin-out

Note: This is a summary document. A complete document is available under NDA. For more information contact www.atmel.com/touchscreen.

9506AS–AT42–10/08

1.2 Pin Listing Description

Table 1-1. Pin Listing

Pin Name Type Comments If Unused, connect To...

1 N/C O Not connected Leave open

2 CHANGE OD State change notification Leave open

3 Vss P Supply ground –

4 Vdd P Power –

5 Vss P Supply ground –

6 Vdd P Power –

7 N/C O Not connected Leave open

8 N/C O Not connected Leave open

9 Vss P Supply ground –

10 VREF I Supply ground –

11 SMP O Sample output –

12 X0 O X matrix drive line Leave open

13 X1 O X matrix drive line Leave open

14 X2 O X matrix drive line Leave open

15 X3 O X matrix drive line Leave open

16 N/C O Not connected Leave open

17 N/C O Not connected Leave open

18 Vdd P Power –

19 Vdd P Power –

20 Vdd P Power –

21 Vss P Supply ground –

22 A0 I I2C-compatible address select –

23 Y0B I/O Y line connection Leave open

24 Y1B I/O Y line connection Leave open

25 Y2B I/O Y line connection Leave open

26 N/C O Not connected Leave open

27 SDA OD Serial Interface Data –

28 SCL OD Serial Interface Clock –

29 RST I Reset low; has internal 30k - 60k pull-up Leave open or Vdd

30 Y0A O Y line connection Leave open

31 Y1A O Y line connection Leave open

32 Y2A O Y line connection Leave open

I Input only I/O Input and output O Output only, push-pull X Clock resonator OD Open drain output P Ground or power

AT42QT4120

9506AS–AT42–10/08

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