STMPE1208S

STMPE1208S Xpander Logic™ with 12-channel touchkey Features ■ 12 touchkey capacitive sensor inputs www.DataSheet4U.com ■ 12-bit general purpose input/output (GPIO) ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ Operating voltage 2.5 − 5.5 V 98 μA in active mode, 60 μA in idle mode Dual interrupt output pin I2C interface (up to 400 kHz) 7 kV HBM ESD protection Idle and sleep mode for low power operation Advanced data filtering (AFS) Environment tracking calibration (ETC) Individually adjustable touch variance (TVR) setting for all channels Adjustable environmental variance (EVR) for optimal calibration QFN40 Description The STMPE1208S is a 12-channel GPIO capacitive touchkey sensor able to interface a main digital ASIC via the two-line bidirectional bus (I2C). It senses changes in capacitance using a fully digital architecture, giving fast and accurate results at very low power consumption. Automatic impedance calibration ensures that changes in environment will never affect the correct operation of the capacitive touchkeys. Applications ■ ■ ■ ■ ■ ■ ■ ■ Notebook computers Monitors Set-top boxes Televisions Portable media players and game consoles Mobile and smart phones Home entertainment systems Domestic appliances Table 1. Device summary Order code STMPE1208SQTR Package QFN40 Packing Tape and reel July 2008 Rev 3 1/51 www.st.com 51 Contents STMPE1208S Contents 1 Pin configuration and function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 1.1 Power management . . . . . ....