Touch-controlled Wall Switch BS83A04A-3 Touch Key Flash MCU Characteristics MCU supports 4 Touch Keys Integrated Touch Key and EEPROM functions Few peripheral components, no need for external crystal oscillator, excellent noise immunity Flash MCU, supports ICP re-programming function Flash Program Memory : 1K16 RAM Data Memory : 968 High touch detection update rate Stylish outline, high touch sensitivity BS83A04-3 Product PCBA Product Outline Application Areas Touch-controlled Wall Switches, Instrumentations, Touch-controlled Appliances, etc. Application Block Diagram Application Circuit U1_3 RF_ENC 1 RF_DATA 2 BUZZER 3 LAMP2 4 8 7 6 5 +3V +3V LAMP1 D1_2 Red C1_1 104 +3V KEY1 LAMP1 LAMP2_LED LAMP1_LED BUZZER LAMP2 +3V D1_3 Blue R1_1 15K ICPDA ICPCK ICPMS VDD VSS MCU Control Circuit R1_6 8.2K D1_1 Blue BS83A04A-3 LAMP1_LED LAMP2_LED LAMP2 D1_4 Red R1_3 8.2K VDD VSS PA5/KEY1 PA2 PA1/KEY2 PA0/INT PA3/KEY3 PA6 PA4/KEY4 PA7 KEY2 +3V R1_4 15K ICP Connection Interface Standby Power Circuit F1 2 AC V+ V- AC 1 R4 471K 3 V+ Q2 R8 220 RF_ENC RF_DATA 8 7 6 5 LAMP2 Ns D1 Nb C2 471 D2 C3 D3 R6 470 Buzzer Circuit VCC +3V R7 10K BUZZER R26 10 220uF 13001 V- 2 Np R5 10M C1 470pF 1kV U2 4 AC 1 2 3 4 MHDR2X4 R3 5.1M L2 AC H2 BUZZER LAMP1 U1 L1 1 R2 5.1M 4 Fuse Thermal(RS-9700) L 3 L_IN +3V R1 100K U+ C4 102 U- D4(5.6V) D14 M7 U3 BUZZER Q1 NPN R25 1K U4 KA 3 V+ G 1 AC L1 U5 V- D5(2.5V) 3 10M 2 R11 5.1M 1 SR2 R10 100k AC C6 105 R9 C7 222 On-state Power Circuit D7 SR1 2 4 L 3 2 AC V+ V- AC U8 C11 5.1K C9 C10 220uF 104 U6 VCC D9 M7 M7 C12 R19 10M D12 SR3 C15 222 R24 1K +3V Vin Vout GND C8U7 7130-1 104 220uF LAMP1 D8 R18 5.1M 4 L2 D10(2.5V) 1 SR4 100k R12 R13 20K 1K R17 D6(5.1V/1W) R14 51k R15 C14 105 C5 10uF Regulator Circuit VCC C13 10uF D11(5.1V/1W) R20 5.1K R22 20K U9 R23 51k D13 M7 105 LAMP2 RF Receiver (reserved) H1 RF_DATA RF_ENC +3V 1 2 3 4 5