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MC33978 Datasheet 22-channel Multiple Switch Detection Interface

Manufacturer: NXP Semiconductors

Overview: MC33978 22-channel multiple switch detection interface with programmable wetting current Rev.

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.

Key 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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