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MC33978 - 22-channel multiple switch detection interface

Description

The 33978 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).

Features

  • Fully functional operation from 4.5 V to 36 V.
  • Full parametric operation from 6.0 V to 28 V.
  • Low-power mode current IBATP = 30 μA and IDDQ = 10 μA.
  • 22 Switch detection channels.
  • 14 Switch-to-Ground (SG) inputs.
  • 8 Programmable switch (SP) inputs.
  • Switch-to-Ground (SG) or Switch-to-Battery (SB).
  • Operating switch input voltage range from -1.0 V to 36 V.
  • Selectable wetting current (2, 6, 8, 10, 12, 14, 16, or 20 mA).
  • Pr.

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Full PDF Text Transcription

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MC33978 22-channel multiple switch detection interface with programmable wetting current Rev. 10 — 20 August 2024 Product data sheet 1 General description The 33978 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). Individually selectable input currents are available in Normal and Low-power (LPM) modes, as needed for the application. It also features a 24-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. A battery and temperature monitor are included in the IC and available via the AMUX pin.
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