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MC33972 - Multiple Switch Detection Interface

General Description

of each pin can be found in the Functional Pin Description section beginning on page 10.

Key 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 33972 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 33972 ideal for automotive and industrial products requiring low sleep-stat.

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Other Datasheets by NXP Semiconductors

Part Number Description
MC33972ATEK Multiple Switch Detection Interface
MC33972ATEW Multiple Switch Detection Interface
MC33972TEW Multiple Switch Detection Interface
MC33978 22-channel multiple switch detection interface
MC33903 SBC Gen2

Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

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NXP Semiconductors Data Sheet: Technical Data Multiple Switch Detection Interface with Suppressed Wake-up The 33972 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 33972 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.