Touch Clock BS82D20A-3 Touch Key Flash MCU Characteristics Touch Key Flash MCU : BS82D20A-3 28SOP Operating voltage : 2.7V~5.5V 20 touch key functions / Flash Program Memory : 8K16 RAM Data Memory : 7688 / EEPROM Memory : 648 2 I C and UART interfaces Low voltage reset function LED driver with 4 current options R-type LCD (SCOM) Timer module 2 (CTM / PTM) Minimal number of external components Futaba – TK Glass Panel Application Areas Electronic Clock Products, LED / LCD Clock, etc. Application Circuit A 1 2 3 4 5 COM1 SEG_E SEG_D SEG_C COM1 COM E D C COM = G F DP A C B F B G E A SEG_G SEG_F SEG_DP SEG_A SEG_B 10 9 8 7 6 1 2 3 4 5 COM2 SEG_E SEG_D SEG_C COM2 COM E D C COM F = G B F DP A C B G E D 10 9 8 7 6 SEG_G SEG_F SEG_DP SEG_A SEG_B R1 R2 R3 R4 R5 R6 R7 R8 330Ω 120Ω 120Ω 120Ω 120Ω 120Ω 120Ω 120Ω SEG_G SEG_F SEG_DP SEG_A SEG_B 10 9 8 7 6 SEG_G SEG_F SEG_DP SEG_A SEG_B DP A PA2_COM4 1 2 SEG_E 3 SEG_D 4 SEG_C PA2_COM4 5 COM E D C COM F = G F DP A C B B G E D DP DISP3 SEGDOT SEGG SEGF SEGE SEGD SEGC SEGB SEGA 10 9 8 7 6 DISP2 A COM E D C COM E D DISP1 PA0_COM3 1 2 SEG_E 3 SEG_D 4 SEG_C PA0_COM3 5 = B G DP D G F DP A C B F DP DISP4 SEG8_DOT SEG_G SEG_F SEG_E SEG_D SEG_C SEG_B SEG_A SEG8_DOT COM2 SEG8_DOT PA0_COM3 LED1 SEG8_DOT LED2 PA2_COM4 LED3 P1 PA0_COM3 PA2_COM4 PA7 S3 1 2 3 4 5 VCC S2 1 R10 X1 R9 5MΩ 104 R11 BZ 1 32768 1 3 2 9V U2 J1 BT1 2 C4 Vin Vout 1 104 HT7550(SOT89) GND 47uF PAD1 - Q1 KTC8550S 8p VIN C3 + KEY7 KEY6 KEY5 KEY4 KEY3 KEY2 KEY1 C2 0Ω 100Ω OSC1 12V 2 2 CP1 BZ1 VCC VCC 3 C5 10uF S5 GND 9 S7 8 S6 7 S5 6 S4 5 S3 4 S2 3 S1 2 GND 1 10p OSC2 VCC S6 S1 Header 5 C1 S7 S4 C6 104 SEGA SEGB SEGC SEGD SEGE SEGF SEGG KEY7 KEY6 KEY5 KEY4 KEY3 KEY2 KEY1 1 2 3 4 5 6 7 8 9 10 11 12 13 14 U1 PB0/SEG0/KEY1 PB1/SEG1/KEY2 PB2/SEG2/KEY3 PB3/SEG3/KEY4 PB4/SEG4/KEY5 PB5/SEG5/KEY6 PB6/SEG6/KEY7 PB7/SEG7/KEY8 PD3/SEG19/KEY9 PD2/SEG18/KEY10 PC0/SEG8/KEY11 PC1/SEG9/KEY12 PC2/SEG10/KEY13 PC3/SEG11/KEY14 BS82D20A-3 PA3/SDA/RX PA0/TCK1/COM2 PA2/COM3 PA7/SCL/TX/RES VDD PD1/TP0_0/SEG17/XT2 PD0/TP1_0/SEG16/XT1 VSS PA1/COM0/KEY20 PA4/INT/TCK0/COM1/KEY19 PC7/TP0_1/SSEG15/KEY18 PC6/TP1_1/SSEG14/KEY17 PC5/SEG13/KEY16 PC4/SEG12/KEY15 28 27 26 25 24 23 22 21 20 19 18 17 16 15 PA3 PA0_COM3 PA2_COM4 PA7 OSC2 OSC1 COM1 COM2 BZ PC6 PC5 SEGDOT VCC