Airbag Power Supply and PSI5 Sensor Interface

MC33789

The NXP® MC33789 is a mixed signal IC for airbag safety applications that provides a cost-effective and flexible system IC solution across the range of airbag partitions used in cars and other vehicles.

  • Connects to the 12 V vehicle battery and supplies the multiple voltages of a typical airbag system
  • Can detect switched input states and communicate with both local and remote crash sensors
  • Offers an industry standard interface (SPI) and four PSI5 leader interfaces
  • Diagnostic - self protection capability and a programmable analog interface accessible by the system MCU
  • The MC33789 is a SafeAssure® functional safety solution.

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Block Diagram

Freescale MC33789 Network Transceivers Block Diagram

NXP<sup>&#174;</sup> MC33789 Network Transceivers Block DiagramV
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Features

  • Designed to operate 5.2 V ≤ VPWR ≤ 20 V, up to 40 V transients
  • Safing state machine with programmable sensing thresholds
  • Two configurable high side/low side drivers with PWM capability
  • Four PSI5 satellite sensor leader interfaces
  • Self-protected and diagnostic capability
  • System power mode control with watchdog and system Power On Reset (POR)
  • Supports complete airbag system power supply architecture, including system power mode control, supplies for squib firing (33 V), satellite sensors (6.3 V), and local ECU sensors and ECU logic circuits (5.0 V)
  • Nine configurable switch input monitors for simple switch and Hall-effect sensor interfaces
  • 16-bit SPI interface
  • LIN 2.1 physical layer interface

SafeAssure Functional Safety Program

SafeAssure Functional Safety Program

When it comes to functional safety, NXP stands for quality and reliability. Our SafeAssure program simplifies system-level safety requirements in accordance with ISO 26262.
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