MC33972 | MSDI with Suppressed Wakeup

Overview

The NXP^® MC33972 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 MCU through a SPI
Features a 22-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
Two modes of operation:
- Normal: allows programming of the device and supplies switch contacts with pull-up or pull-down current monitoring switch change of state
- Sleep: provides low quiescent current, making MC33972 ideal for automotive and industrial products requiring low sleep state currents

Features

Interfaces directly to microprocessor using 3.3 V / 5.0 V SPI protocol
Selectable wake-up on change of state
Eight programmable inputs (switches to battery or ground)
Fourteen switch-to-ground inputs
Active Interrupt (INT) on change-of-switch state
Switch Voltage Range -14 – VPWR
Operating Voltage 5.5 V – 26 V (VPWR)
This product is included in NXP^®.s product longevity program, with assured supply for a minimum of 15 years after launch

Features

Interfaces directly to microprocessor using 3.3 V / 5.0 V SPI protocol
Selectable wake-up on change of state
Eight programmable inputs (switches to battery or ground)
Fourteen switch-to-ground inputs
Active Interrupt (INT) on change-of-switch state
Switch Voltage Range -14 – VPWR
Operating Voltage 5.5 V – 26 V (VPWR)
This product is included in NXP^®.s product longevity program, with assured supply for a minimum of 15 years after launch

Key Parametrics