STEVAL-ICB002V1

STEVAL-ICB002V1 Capacitive touch daughterboard based on the STMPE821 Data brief Features STM32-based STEVAL-PCC009V3 used as motherboard Demonstrates up to 3 capacitive touch keys PWM output / GPIO output features Multiple touch detection RoHS compliant Description The STEVAL-ICB002V1 daughterboard is based on the STMPE821 8-channel capacitive touch key controller. This board connects to the STEVAL- PCC009V3 interface board, which acts as the motherboard, to form the STM32-based capacitive touch demonstration application STEVAL-ICB002V1 designed to evaluate the functioning of the Power to the interface board (motherboard) is STMPE821 device. provided from a USB Mini-B type connector. The The STMPE821 is a GPIO (general purpose daughterboard is powered from the motherboard input/output) port expander with a built-in via the 10-pin connector. capacitive touchkey controller. The device is capable of interfacing with a main digital ASIC/controller using the 2-line communication 2 protocol I C. The STM32 microcontroller is used as the main digital controller to interface the STMPE821 device, and utilizes the capacitive touchkey controller, GPIO controller and PWM controller features of the STMPE821 in the application. The STMPE821 device controls 3 different touchkeys using the integrated capacitive touchkey controller. Touch events are indicated on LEDs using the GPIO controller, and the corresponding PWM frequency is generated on a separate LED using the PWM controller. The STM32-based STEVAL-PCC009V3 interface board acts as motherboard for the application and connects to the STEVAL-ICB002V1 via a 10-pin connector. February 2010 Doc ID 17190 Rev 1 1/4 For further information contact your local STMicroelectronics sales office. www.st.com 4 / / / / 2 / / / / / / 2 2 2 2 0 0 ). 0 ). 0 %2 8%2 8 (% (% 5 5 2 2 2 2 ) 2 0) / 0) 0) 0) Schematic diagram STEVAL-ICB002V1 1 Schematic diagram Figure 1. STEVAL-ICB002V1 daughterboard circuit schematic / N& N& U& U& -.-. U& U& , 4 N& N& .- / 4 , K 4 P& P& % & 6 6)/ / / P& P& / / )/ / ) /) )/ P& P& P& P& / P& P& - V 2/4 Doc ID 17190 Rev 1 . 6) * * 3 3 6) 6 ,% ,% ,% ,% 6) 3434 -0%-0% 3 * * * * 3 3 , 3 3 234 234 K 3 3 3 3 3 3 K K 6 6) 6 3