Datasheet Summary
22-channel multiple switch detection interface with programmable wetting current
Rev. 10
- 20 August 2024
Product data sheet
1 General description
The 33978 is designed to detect the closing and opening of up to 22 switch contacts. The switch status, either open or closed, is transferred to the microprocessor unit (MCU) through a serial peripheral interface (SPI). Individually selectable input currents are available in Normal and Low-power (LPM) modes, as needed for the application.
It also Features a 24-to-1 analog multiplexer for reading inputs as analog. The analog input signal is buffered and provided on the AMUX output pin for the MCU to read. A battery and temperature...