31 Touch Clock BS85B12-5 Touch Key Flash MCU Characteristics Touch Key MCU : BS85B12-5 28-pin SSOP ( 8-bit Flash Type MCU) Internal EPROM Touch Wheel Key Few External Components Required and High Stability Excellent S/N Ratio Touch Wheel Key Application Areas Electronic Clock Products, LED / LCD Clock , etc. Application Circuit SEG1 SEG2 SEG3 SEG4 SEG5 SEG6 SEG7 VIN J1 9V R1 200KΩ BT1 PC1 U1 2 C1 R2 110KΩ 47uF C2 104 Vin HT7550(SOT89) GND 1 3 2 Vout 1 12V 3 VCC C3 C4 10uF 104 COM1 16 15 3 2 1 18 17 4 14 DS1 a b c d e f g DP1 A1 DIG1 11 10 8 6 5 12 7 9 13 a DIG2 b c d e f g DP2 A2 SEG1 SEG2 SEG3 SEG4 SEG5 SEG6 SEG7 SEG1 SEG2 SEG3 SEG4 SEG5 SEG6 SEG7 COM2 COM3 HDSP-521E 16 15 3 2 1 18 17 4 14 DS2 a b c d e f g DP1 A1 DIG1 DIG2 a b c d e f g DP2 A2 11 10 8 6 5 12 7 9 13 HDSP-521E COM2 SEG8 LED1 P1 PA0 PA2 PA7 U2 PB0/TP0_0/SCOM0 PB1/TP0_1/SCOM1 PB2/TP1B_0/SCOM2 PB3/TP1B_1/SCOM3 PB4/TP1B_2/PCK/SSEG8 PB5/PINT/TP1A/SSEG9 PA1/TCK1/INT1/SSEG10 PA4/TCK0/INT0/SSEG11 OSC2 OSC1 PA3/SCS PA0/SDI/SDA PA2/SCK/SCL PA7/SDO PA0 PA2 PA7 R3 R4 R5 R6 330Ω 330Ω 330Ω 330Ω COM1 COM2 COM3 COM4 SEG8 SEG7 SEG6 SEG5 R7 R8 R9 R10 330Ω 330Ω 330Ω 330Ω SEG4 SEG3 SEG2 SEG1 VCC Header 5 CP1 104 SEG8 COM3 LED2 SEG8 COM4 LED3 C5 VCC 1 2 X1 BS85B12-5 VCC 1 2 3 4 5 2 1 1 1 1 1 1 1 1 1 KEY1/SSEG0/SDO/TP0_0/PC0 KEY2/SSEG1/SCL/SCK/TP0_1/PC1 KEY3/SSEG2/SDA/SDI/TPIB_0/PC2 KEY4/SSEG3/SCS/TPIB_1/PC3 KEY5/SSEG4/TPIB_2/INT0/TCK0/PC4 KEY6/SSEG5/TP1_A/INT1/TCK1/PC5 KEY7/SSEG6/PCK/PC6 KEY8/SSEG7/PINT /PC7 KEY9 KEY10 KEY11 KEY12 VSS VDD 28 27 26 25 24 23 22 21 20 19 18 17 16 15 1 PAD1 PAD2 PAD3 PAD4 PAD5 PAD6 PAD7 PAD8 PAD9 1 2 3 4 5 6 7 8 9 10 11 12 13 14 PC0 PC1 PC2 KEY1 KEY2 KEY3 KEY4 KEY5 KEY6 KEY7 KEY8 KEY9 SEG1 SEG2 SEG3 SEG4 SEG5 SEG6 SEG7 SEG8 COM4 R12 10MΩ 32768 C6 PC0 R11 100Ω BZ1 + - Q1 KTC8550S