MSDI with Suppressed Wakeup

MC33972

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The NXP® MC33972 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 MCU through a SPI
  • 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
  • Two modes of operation:
    • Normal: allows programming of the device and supplies switch contacts with pull-up or pull-down current monitoring switch change of state
    • Sleep: provides low quiescent current, making MC33972 ideal for automotive and industrial products requiring low sleep state currents

Product Details

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Block Diagram

NXP MC33972 Power Actuation Block Diagram

NXP MC33972 Power Actuation Block Diagram
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Features

Key Features

  • Interfaces directly to microprocessor using 3.3 V / 5.0 V SPI protocol
  • Selectable wake-up on change of state
  • Eight programmable inputs (switches to battery or ground)
  • Fourteen switch-to-ground inputs
  • Active Interrupt (INT) on change-of-switch state
  • Switch Voltage Range -14 – VPWR
  • Operating Voltage 5.5 V – 26 V (VPWR)

Product Longevity Program

  • This product is included in the NXP Product Longevity Program ensuring a stable supply of products for your embedded designs. The MC33972 is included in the 15-year program

Key Parametrics

  • Device Function
    powertraincontrol, signalconditioning, switchmonitoring
  • Package Termination Count
    32
  • Package Type
    SSOP32
  • Load Supply Voltage (Min) (V)
    5.5
  • Load Supply Voltage (Max) (V)
    26
  • Interface and Input Control
    SPI
  • Ambient Operating Temperature (Min to Max) (℃)
    -40 to 125

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Software

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