STMPE1208SQTR STMicroelectronics

STMPE1208S S-Touch 12-channel capacitive touchkey controller Features 12 touchkey capacitive sensor inputs 12-bit general purpose input/output (GPIO) Operating voltage 3.0 5.5 V 98 A in active mode, 60 A in idle mode Dual interrupt output pin 2 I C 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) QFN40 Individually adjustable touch variance (TVR) setting for all channels Adjustable environmental variance (EVR) for optimal calibration Applications Description Notebook computers The STMPE1208S is a 12-channel GPIO capacitive Monitors touchkey sensor able to interface a main digital ASIC 2 via the two-line bidirectional bus (I C). It senses Set-top boxes changes in capacitance using a fully digital Televisions architecture, giving fast and accurate results at very low Portable media players and game consoles power consumption. Automatic impedance calibration Mobile and smart phones ensures that changes in environment will never affect the correct operation of the capacitive touchkeys. Home entertainment systems Domestic appliances Table 1. Device summary Order code Package Packing STMPE1208SQTR QFN40 Tape and reel December 2009 Doc ID 14438 Rev 5 1/47 www.st.com 47 Obsolete Product(s) - Obsolete Product(s)Contents STMPE1208S Contents 1 Pin configuration and function 6 1.1 Power management 9 2 Clock setting 10 3 I2C interface . 11 3.1 Start condition . 11 3.2 Stop condition . 11 3.3 Acknowledge bit (ACK) . 11 3.4 Data Input . 12 3.5 Slave device address 12 3.6 Memory addressing . 12 4 Power schemes 14 5 Capacitive sensors . 15 5.1 Capacitive sensing 15 5.2 Capacitance compensation . 16 5.3 Setting of TVR and EVR 16 5.3.1 3-stage data filtering system . 17 5.3.2 Noise filtering . 18 5.3.3 BEEP output . 18 5.3.4 Interrupt system . 19 6 Register map and function description . 20 7 Command registers . 36 8 Maximum rating 39 8.1 Recommended operating conditions 39 9 Electrical specifications . 40 10 Package mechanical data 41 2/47 Doc ID 14438 Rev 5 Obsolete Product(s) - Obsolete Product(s)