STMPE321QTR datasheet(1/40 Pages) STMICROELECTRONICS

Part #	STMPE321QTR

Description	3-channel capacitive touchkey controller

PDF	40 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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1 / 40 page

August 2009

Doc ID 15791 Rev 3

1/40

40

STMPE321

3-channel capacitive touchkey controller

Features

■ Up to 3 GPIOs

■ Up to 3 capacitive touchkey inputs

■ Operating voltage 1.65 - 1.95 V

■ Interrupt output pin

■ I2C interface (1.8 V operation, 3.3 V tolerant)

■ 8 kV HBM ESD protection

■ 40 fF resolution, 128-step capacitance

measurement

■ Advanced data filtering (AFS)

■ Environment tracking calibration (ETC)

■ Individually adjustable touch variance (TVR)

settings for all channels

■ Adjustable environmental variance (EVR) for

optimal calibration

■ Capacitive key sensing capability in 27 µA

sleep mode

Applications

■ Mobile phones and smartphones

■ Portable media players

■ Game consoles

Description

The STMPE321 is a 3-channel capacitive

touchkey controller. Capacitance measurement is

implemented in fully optimized hardware.

All 3 I/Os can be configured via an I2C bus to

function as either capacitive touchkey, or as

GPIOs (general purpose I/O).

QFN12

(2.2 x 1.5 mm)

Table 1.

Device summary

Order code

Package

Packing

STMPE321QTR

QFN12 (2.2 x 1.5 mm)

Tape and reel

www.st.com

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