STEVAL-ICB007V1

STEVAL-ICB007V1 Capacitive touch demonstration board based on the STMPE321 Data brief Description The STEVAL-ICB007V1 demonstration board employs STM32-based capacitive touch to demonstrate the functionality and performance of the STMPE321, a 3-channel capacitive touch key controller. ) s ( ct u d o r P e Capacitance measurement is implemented in fully optimized hardware, and the 3 I/Os can be configured as either capacitive touchkeys or as GPIOs (general purpose input/output). The device is capable of interfacing with a main digital ASIC/controller through the 2-line communication protocol I2C. t e l o ) (s Features • t c u STM32 microcontroller is used as the main digital controller to interface the STMPE321 device STMPE321 device controls 3 different touch keys Touch events are indicated on the LEDs RoHS compliant d o r • • • t e l o P e s b O June 2011 s b O In the STEVAL-ICB007V1 demonstration board, the STM32 microcontroller is used as the main digital controller to interface with the STMPE321 device. The system utilizes the capacitive touchkey controller of the STMPE321 and PWM features of the STM32 to demonstrate the application. The STMPE321 controls 3 different touchkeys using an integrated capacitive touch controller. Touch events are indicated on the LEDs using the STM32 GPIO pins, and the corresponding PWM frequency is generated on a separate LED using the STM32 timer. DocID018907 Rev 1.0 For further information contact your local STMicroelectronics sales office. 1/4 www.st.com 2/4 DocID018907 Rev 1.0 3 2 R11 10k 5 INHIBIT BYPASS 4 LD2985BM18R_SOT23-5L GND OUT S0 S1 C10 10nF 1V8 4 IN NC 1 RST GND U2 STMPE321 5 C7 3V3 1uF C5 5pF DNM 6 SDA R12 10K DNM GND 7 C9 100nF 1V8 R6 1K 8 9 1V8 C6 10uF GND VCC SREF SCL INT S2 NC 3 11 2 10 1 12 U1 CON1 INT 3V3 1V8 CREF 5pF t c u 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 CN3 3V3 SCL GND INT PB15_TIM1_CH3N PB0_TIM3_CH3 s b O CON30 CN2 C8 100nF ) (s 3V3 GND C4 5pF DNM CON2 CON3 BUTTON C 1 4.7K P e d o r C3 5pF DNM BUTTON B 1 b O so let BUTTON A 1 R1 CN1 2 4 6 8 10 LED LED D4 LED D3 LED D2 D1 HEADER5X2 1 3 5 7 9 PB15_TIM1_CH3N PB0_TIM3_CH3 PB1_TIM3_CH4 R8 220 R9 220 R10 220 u d o r P e t e l o CON30 PB13_TIM1_CH1N R4 220 PB1_TIM3_CH4 SDA 3V3 PB13_TIM1_CH1N RST R13 0 DNM INT R7 10K DNM C1 22pF R2 10K 3V3 DNM 3V3 1V8 DNM R5 4.7K DNM C2 22pF SDA SCL R3 10K DNM 1 RST Circuit schematic STEVAL-ICB007V1 Circuit schematic ) s ( ct AM09289V1 STEVAL-ICB007V1 2 Revision history Revision history Date Revision Changes 03-Jun-2011 1 Initial release. ) s ( ct u d o r P e t e l o ) (s s b O t c u d o r P e t e l o s b O DocID018907 Rev 1.0 3/4 Revision history STEVAL-ICB007V1 Disclaimer Please Read Carefully ) s ( ct Information in this document is provided solely in connection with ST products. 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