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| STMPE1208S 12 channel touch key controller Data Brief Features 12 touch key capacitive sensor inputs 12-bit general purpose Input/Output Operating voltage 2.5-5.5V 98A in active mode, 60A in idle mode Dual interrupt output pin I2C interface (Up to 400KHz) 8kV HBM ESD protection Idle and sleep mode for low power operation Advanced Filtering System (AFS) Environment tracking calibration (ETC) Individually adjustable TouchVariance (TVR) setting for all channels Adjustable EnvironmentalVariance (EVR) for optimal calibration QFN40 5mm x 5mm Applications Notebook Computer, Monitor Set Top Box, Television Portable media player, Game console Mobile phone, Smart phone Home Entertainment Systems Domestic Appliances Description The STMPE1208S is a GPIO 12 channel capacitive touch key 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 touch keys. Table 1. Device summary Part Number STMPE1208SQTR Package QFN40 5mm x 5mm Packaging Tape and reel June 2007 Rev 1 1/12 www.st.com 12 For further information contact your local STMicroelectronics sales office. Contents STMPE1208S Contents 1 2 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Pin settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 2.1 2.2 Pin connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Pin assignment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 4 5 6 Application diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Power management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 2/12 STMPE1208S Block diagram 1 Block diagram Figure 1. Block diagram Data Filtering Unit Automatic Calibration Unit 12-input Capacitive Sensor A_Ref ID_0 ID_1 RESET G_INT T_INT SDAT SCLK Host Interface Unit S_In 0-11 12-bit GPIO BEEP Generator BEEP GPIO 0-11 Clock Control Unit Regulator & Power Control TCLK VPH VREG V25 3/12 Pin settings STMPE1208S 2 2.1 Pin settings Pin connection Figure 2. Pin connection S_IN_3 S_IN_4 S_IN_5 S_IN_6 S_IN_7 S_IN_8 VREG GND VPH V25 S_IN_2 S_IN_1 S_IN_0 RESET_N ID_1 ID_0 GPIO_5 GPIO_4 GPIO_3 GPIO_2 S_IN_9 S_IN_10 S_IN_11 S_REF GND VPH GPIO_6 GPIO_7 GPIO_8 GPIO_9 GPIO_1 GPIO_0 SDATA SCLK QFN40 T_INT G_INT BEEP TCLK GPIO_11 GPIO_10 2.2 Pin assignment Table 2. Pin assignment Pin 1 2 3 4 5 6 7 8 9 10 11 Name GPIO_1 GPIO_0 SDATA SCLK TINT GINT BEEP TCLK GPIO_11 GPIO_10 GPIO_9 General Purpose I/O General Purpose I/O I2C Data I2C Clock Touch Interrupt General Interrupt Beep output Test Pin General Purpose I/O General Purpose I/O General Purpose I/O Description 4/12 STMPE1208S Table 2. Pin assignment (continued) 12 13 14 15 GPIO_8 GPIO_7 GPIO_6 VPH General Purpose I/O General Purpose I/O General Purpose I/O 3-5.5V Power Supply (Regulator Input) Supply to this pin is also used for powering the GPIO 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 GND S_REF S_IN_11 S_IN_10 S_IN_9 S_IN_8 S_IN_7 S_IN_6 GND V25 VREG VPH S_IN_5 S_IN_4 S_IN_3 S_IN_2 S_IN_1 S_IN_0 RESET_N ID_1 ID_0 GPIO_5 GPIO_4 GPIO_3 GPIO_2 GROUND Pin settings Touch Sensing Reference. 1-5pF capacitor for compensation of stray capacitance on board, optional. Capacitive sensing channel 11 Capacitive sensing channel 10 Capacitive sensing channel 9 Capacitive sensing channel 8 Capacitive sensing channel 7 Capacitive sensing channel 6 GROUND 2.5V Supply Internal regulator output 3-5.5V Power Supply (Regulator Input) Capacitive sensing channel 5 Capacitive sensing channel 4 Capacitive sensing channel 3 Capacitive sensing channel 2 Capacitive sensing channel 1 Capacitive sensing channel 0 Active Low Reset I2C Address 1 I2C Address 2 General Purpose I/O General Purpose I/O General Purpose I/O General Purpose I/O 5/12 Application diagram STMPE1208S 3 Application diagram Figure 3. Application diagram Up to 12 "Touch Pads" RESET G_INT Sin 0-11 T_INT SDAT STMPE1208S SCLK GPIO 0-11 System Host Up to 12 GPIO for system usage 6/12 STMPE1208S Power management 4 Power management STMPE1208S operates in 3 states: Figure 4. Power management RESET ACTIVE Host Command Touch or Host Command Time Out SLEEP Host Command IDLE On RESET, STMPE1208S enters ACTIVE state immediately. Upon a fixed period of inactivity, device enters IDLE state. Any touch activity in IDLE state would cause the device to go back to ACTIVE state. If no touch activity is expected, host may set the device into SLEEP state to conserve power. 7/12 Package mechanical data STMPE1208S 5 Package mechanical data In order to meet environmental requirements, ST offers these devices in ECOPACK(R) packages. These packages have a Lead-free second level interconnect . The category of second level interconnect is marked on the package and on the inner box label, in compliance with JEDEC Standard JESD97. The maximum ratings related to soldering conditions are also marked on the inner box label. ECOPACK is an ST trademark. ECOPACK specifications are available at: www.st.com Table 3. QFN40 5mm x 5mm Mechanical data mm. Dim. Min A A1 A3 b D E D2 E2 e L L1 P aaa ccc 45 BSC 0.15 0.10 0.30 3.70 3.70 0.15 0.80 0.00 0.203 ref 0.20 5.00 BSC 5.00 BSC 3.80 3.80 0.40 BSC 0.35 0.40 0.10 3.90 3.90 0.25 Typ 0.85 Max 0.90 0.05 8/12 STMPE1208S Figure 5. Package dimensions Package mechanical data 9/12 Package mechanical data Figure 6. Tape and reel STMPE1208S 10/12 STMPE1208S Revision history 6 Revision history Table 4. Revision history Date 19-Jun-2007 Revision 1 Initial release Changes 11/12 STMPE1208S Please Read Carefully: Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries ("ST") reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. All ST products are sold pursuant to ST's terms and conditions of sale. Purchasers are solely responsible for the choice, selection and use of the ST products and services described herein, and ST assumes no liability whatsoever relating to the choice, selection or use of the ST products and services described herein. No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. If any part of this document refers to any third party products or services it shall not be deemed a license grant by ST for the use of such third party products or services, or any intellectual property contained therein or considered as a warranty covering the use in any manner whatsoever of such third party products or services or any intellectual property contained therein. UNLESS OTHERWISE SET FORTH IN ST'S TERMS AND CONDITIONS OF SALE ST DISCLAIMS ANY EXPRESS OR IMPLIED WARRANTY WITH RESPECT TO THE USE AND/OR SALE OF ST PRODUCTS INCLUDING WITHOUT LIMITATION IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION), OR INFRINGEMENT OF ANY PATENT, COPYRIGHT OR OTHER INTELLECTUAL PROPERTY RIGHT. UNLESS EXPRESSLY APPROVED IN WRITING BY AN AUTHORIZED ST REPRESENTATIVE, ST PRODUCTS ARE NOT RECOMMENDED, AUTHORIZED OR WARRANTED FOR USE IN MILITARY, AIR CRAFT, SPACE, LIFE SAVING, OR LIFE SUSTAINING APPLICATIONS, NOR IN PRODUCTS OR SYSTEMS WHERE FAILURE OR MALFUNCTION MAY RESULT IN PERSONAL INJURY, DEATH, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE. ST PRODUCTS WHICH ARE NOT SPECIFIED AS "AUTOMOTIVE GRADE" MAY ONLY BE USED IN AUTOMOTIVE APPLICATIONS AT USER'S OWN RISK. Resale of ST products with provisions different from the statements and/or technical features set forth in this document shall immediately void any warranty granted by ST for the ST product or service described herein and shall not create or extend in any manner whatsoever, any liability of ST. ST and the ST logo are trademarks or registered trademarks of ST in various countries. Information in this document supersedes and replaces all information previously supplied. The ST logo is a registered trademark of STMicroelectronics. All other names are the property of their respective owners. (c) 2007 STMicroelectronics - All rights reserved STMicroelectronics group of companies Australia - Belgium - Brazil - Canada - China - Czech Republic - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan Malaysia - Malta - Morocco - Singapore - Spain - Sweden - Switzerland - United Kingdom - United States of America www.st.com 12/12 |
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