MC34972 Overview
Freescale Semiconductor Technical Data Document Number: 1.0, 9/2013 Multiple Switch Detection Interface with Suppressed Wake-up 34972 The 34972 Multiple Switch Detection Interface with suppressed wake-up 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).
MC34972 Key Features
- Designed to operate 5.5 V VPWR 26 V
- Switch input voltage range -14 V to VPWR, 40 V Max
- Interfaces directly to MPU using 3.3 V/5.0 V SPI protocol
- Selectable wake-up on change of state
- Selectable wetting current (16 or 2.0 mA)
- Eight programmable inputs (switches to supply or ground)
- 14 switch-to-ground inputs
- Typical standby current
- VPWR = 100 A and VDD = 20 A
- Active interrupt (INT) on change-of-switch state