NXP Semiconductors Interface - Interface - Specialized - MC33972ATEWR2 MC33972ATEWR2

The Multiple Switch Detection Interface (part number 41AH8196) is designed to detect the opening and closing of up to 22 switch contacts, transferring the status to a microprocessor unit (MCU) via a serial peripheral interface (SPI). It operates within a supply voltage range of 5.5 V to 26 V and supports switch input voltages from -14 V to 40 V. The device features a 22-to-1 analog multiplexer for analog input reading, with buffered output provided to the MCU. This interface has two operational modes: Normal and Sleep. In Normal mode, it allows programming and provides pull-up or pull-down current to the switch contacts while monitoring their state changes. The Sleep mode is optimized for low quiescent current, making it suitable for applications in automotive and industrial environments where power efficiency is critical. The device also includes features such as selectable wake-up on state change, programmable wetting current options, and active interrupt signaling on switch state changes. The typical standby current is 100 OºA at V_PWR = 5.0 V. Engineers considering this product should evaluate its specifications against their project requirements, particularly in terms of voltage compatibility and power consumption during sleep states.