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33972A - Multiple Switch Detection Interface

Download the 33972A datasheet PDF (33972 included). The manufacturer datasheet provides complete specifications, pinout details, electrical characteristics, and typical applications for multiple switch detection interface.

Description

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

8 25 28 9 15, 18 24 16 17 29 30 31 32 Pin Name GND SI SCLK CS SP0 3 SP4 7 SG0 6, SG13 7 VPWR WAKE INT AMUX VDD S

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 pullup or pulldown 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 state.

📥 Download Datasheet

Note: The manufacturer provides a single datasheet file (33972_FreescaleSemiconductor.pdf) that lists specifications for multiple related part numbers.

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Full PDF Text Transcription

Click to expand full text
www.DataSheet4U.com Freescale Semiconductor Advance Information Document Number: MC33972 Rev. 9.0, 4/2007 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.
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