Four Channel Squib Driver IC

MC33797

The NXP® MC33797 is a four-channel squib driver integrated circuit with a complete squib diagnostic and deployment interface for use in automotive air bag modules.

  • Extensive diagnostics and system control features are incorporated to provide fail-safe operation
  • Contains a SPI-compatible 8-bit interface to allow microprocessor control
  • The device has the capability to be used in a standard four-channel squib driver IC or in a cross coupled state with the high- and low-side squib drivers located on separate squib driver ICs
  • Both high- and low-side output drivers are protected against temporary shorts to battery or ground and the current limit threshold is set by an external resistor

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Block Diagram

Four Channel Squib Driver IC

Four Channel Squib Driver IC
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Features

  • Four-channel high-side and low-side 2.0 A FET switches
  • Externally adjustable FET current limiting
  • Adjustable current limit range: 0.8 A to 2.0 A
  • Individual channel current limit detection with timing duration measurement, communicated via SPI
  • 8-bit SPI for diagnostics and FET switch activation
  • Diagnostics for high-side safing sensor status
  • Resistance and voltage diagnostics for squibs
  • Squib driver IC capability to be used for cross-coupled driver firing application (allows high- and low-side FET switches to be located on separate squib driver ICs)

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