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STMicroelectronics Electronic Components Datasheet

STMPE321 Datasheet

3-channel capacitive touch key controller

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STMPE321 pdf
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STMPE321
3-channel capacitive touch key controller
Features
Up to 3 GPIOs
Up to 3 capacitive touch key inputs
Operating voltage 1.65 - 1.95 V
Internal regulator
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
QFN12
(2.2 x 1.5 mm)
Description
The STMPE321 is a 3-channel capacitive touch
key 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 touch key, or as
GPIOs (general purpose I/O).
Table 1. Device summary
Order code
STMPE321QTR
June 2009
Package
QFN12 (2.2 x 1.5 mm)
Doc ID 15791 Rev 1
Packing
Tape and reel
1/40
www.st.com
40


STMicroelectronics Electronic Components Datasheet

STMPE321 Datasheet

3-channel capacitive touch key controller

No Preview Available !

STMPE321 pdf
www.DataSChoeent4teUn.ctosm
Contents
STMPE321
1 STMPE321 functional overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1 STMPE321 block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.2 Pin assignment and function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.3 STMPE321 typical application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2 Capacitance compensation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.1 Calibration algorithm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.1.1 Noise filtering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.1.2 Data filtering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.2 Power management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3 I2C interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
4 Register map and function description . . . . . . . . . . . . . . . . . . . . . . . . . 12
5 System and identification registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
6 Interrupt controller module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
7 GPIO controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
8 Capacitive touch module registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
9 Maximum rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
10 Electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
10.1 Capacitive sensing characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
11 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
12 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
2/40 Doc ID 15791 Rev 1


Part Number STMPE321
Description 3-channel capacitive touch key controller
Maker ST Microelectronics
Total Page 30 Pages
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