Parallel CPU interface

SPI interrace

32 relay/LED drivers, divided into

4 groups, rated at 40mA

Low current CMOS process

Patented capacitance to voltage

(C-V) converter

A electrode terminal

Common B electrode terminal

Sleep mode

Active shield signal output

Digital moving average filter

Temperature compensation

10-bit ADC

Threshold comparator

Interrupt output

Internal EEPROM

I2C interface

Digital moving average filter

Temperature compensation

10-bit ADC

2 threshold comparators

Interrupt output

Internal EEPROM

SPI interface

8-channel A electrode terminals

Common B electrode terminal

Active shield signal output

Low current CMOS process

Patented capacitance to voltage

(C-V) converter