june 2011 docid018907 rev 1.0 1/4 for further information contact your local stmicroelectronics sales office. www.st.com STEVAL-ICB007V1 capacitive touch demonstration board based on the stmpe321 data brie f features ? 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 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. 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. 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.
circuit schematic STEVAL-ICB007V1 2/4 docid018907 rev 1.0 gnd 1v8 rst 1v8 scl gnd int pb15_tim1_ch3n pb0_tim3_ch3 pb1_tim3_ch4 pb13_tim1_ch1n 3v3 sda scl sda int pb13_tim1_ch1n pb15_tim1_ch3n pb0_tim3_ch3 pb1_tim3_ch4 3v3 3v3 int 3v3 gnd gnd 3v3 1 v8 rst 3v3 3v3 1v8 1v8 dnm dnm dnm dnm dnm dnm dnm dnm dnm dnm r8 220 r8 220 c9 100n f c9 100n f r12 10k r12 10k c2 22pf c2 22pf cn2 con30 cn2 con30 1 2 3 4 5 6 7 8 9 1 0 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 d2 led d2 led c5 5pf c5 5pf c4 5pf c4 5pf c8 100nf c8 100nf c1 22pf c1 22pf u1 stmpe321 u1 stmpe321 nc 4 sda 5 scl 6 12 rst int 11 nc 10 s2 1 s1 2 s0 3 sref 9 vcc 8 gnd 7 c3 5pf c3 5pf c6 10u f c6 10u f r9 220 r9 220 r1 4.7k r1 4.7k r13 0 r13 0 cn3 con30 cn3 con30 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 button c con1 button c con1 1 button b con2 button b con2 1 r6 1k r6 1k button a con3 button a con3 1 d3 led d3 led r10 220 r10 220 u2 ld2985bm18r_sot23-5l u2 ld2985bm18r_sot23-5l in 1 gnd 2 inhibit 3 bypass 4 out 5 c7 1uf c7 1uf r11 10k r11 10k cref 5pf cref 5pf c10 10nf c10 10nf r5 4.7k r5 4.7k r4 220 r4 220 cn1 header5x2 cn1 header5x2 1 2 3 4 5 6 7 8 9 10 d4 led d4 led d1 led d1 led r3 10k r3 10k r2 10k r2 10k r7 10k r7 10k am09289v1 1 circuit schematic
STEVAL-ICB007V1 revision history docid018907 rev 1.0 3/4 2 revision history date revision changes 03-jun-2011 1 initial release.
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