Standard 12-Touch Keys BS8112A-3 + HT48R003 Characteristics Touch Keys : BS8112A-3 16-pin NSOP + HT48R003 16-pin NSOP Operating voltage : 2.2V ~ 5.5V Low standby current Auto-calibration Reliable touch key detections High power supply rejection Standby and normal operating power modes Maximum key on duration time detection Power supply voltage drop rejection function 12 touch key inputs 2 I C interface 3 Option ◆ ◆ ◆ LSC ‒ lower standby current Key12 / IRQ function select Key wakeup function Sensitivity adjustment using an external capacitor Minimal number of external components Applications Consumer Products, Home Appliances, Industrial Control, Health Care Products, etc. Application Circuit LED2 LED3 LED4 LED5 OUT7 OUT6 OUT5 LED1 JP1 LED6 LED7 LED9 LED8 5 4 3 2 1 LED10 LED11 LED12 GND VDD SDA SCL IRQ CN1 OUT4 OUT3 OUT2 OUT1 OUT4 OUT3 OUT2 OUT1 OUT4 OUT3 OUT2 OUT1 5 4 3 2 1 GND VDD SDA SCL IRQ U2 OUT8 OUT7 OUT6 OUT5 OUT4 OUT3 OUT2 OUT1 R4 R3 R2 R1 220 220 220 220 1 2 3 4 5 6 7 8 PA4 PC5 PC4 PC3 PC2 PC1 PC0 PA3 PA5 PA6 PA7 VDD VSS PA0 PA1 PA2 16 15 14 13 12 11 10 9 LSC OMS VDD GND IRQ SCL SDA 0 OptionA 0 OptionB VDD C1 HT48R003 16NSOP 104 BAT1 CR2032 KEY3 KEY2 KEY4 U1 KEY1 KEY5 KEY6 KEY7 1 2 3 4 5 6 7 8 KEY3 KEY4 KEY5 KEY6 KEY7 KEY8 KEY9 KEY10 KEY2 KEY1 SDA SCL VDD VSS KEY12/IRQ KEY11 16 15 14 13 12 11 10 9 SDA SCL VDD GND IRQ R6 1K R5 1K VDD C2 104 CR2032 BAT1 BS8112A-3 16NSOP KEY8 KEY12 KEY9 KEY11 KEY10