MC33972ATEW Datasheet

Interface - Specialized


The MC33972ATEW 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). The device also 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.The MC33972ATEW device has two modes of operation, Normal and Sleep. Normal mode allows programming of the device and supplies switch contacts with pull-up or pull-down current as it monitors switch change of state. The Sleep mode provides low quiescent current, which makes the MC33972ATEW ideal for automotive and industrial products requiring low sleep-state currents. MC33972ATEW 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)• 8 programmable inputs (switches to battery or ground)• 14 switch-to-ground inputs • Typical standby current - VPWR = 100 μA and VDD = 20 μA • Active interrupt (INT) on change-of-switch state


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