STMPE812A datasheet(6/53 Pages) STMICROELECTRONICS

Part #	STMPE812A

Description	Integrated 4-wire resistive touchscreen controller, pen-down/real-time mode, fullyautonomous

PDF	53 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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6 / 53 page

STMPE812A functional overview

STMPE812A

6/53

Doc ID 18225 Rev 4

Note:

All I/O operates on VCC. All I/O tolerant up to 3.6 V, across VCC = 1.65 - 3.6 V

8 kV HBM ESD on all touchscreen pins (+/- 8 kV vs GND)

0.5 µA max input leakage as input, across VCC range (GPIO, SCL/SDA)

4 µs hardware filter on the 3 GPIOs as input

SDA

-4 mA

I2C data (fail safe, tolerant to 3.6 V regardless of

VCC)

+8 mA/-12 mA at

3.3 V

GPIO-2/ INT (3.6 V tolerant within VCC valid

range)

+8 mA/-12 mA at

3.3 V

GPIO-1/ADC/PWM (3.6 V tolerant within VCC valid

range except VIN_ADC must be less than VCC)

+8 mA/-12 mA at

3.3 V

GPIO-0/ADDR (3.6 V tolerant within VCC valid

range)

VCC

Can be > 80 mA

load at touchscreen

and GPIO drive

1.65 - 3.6 V core/IO supply (0.1 µF decoupling

cap)

No low-voltage detection for POR

20 µs POR from power stable

X+

50 mA current limit

X+

Table 2.

Pin assignments (continued)

Name

Current capacity

Function

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