Four Channel Squib Driver IC
Design Files
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Airbag Power Supply and PSI5 Sensor Interface
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.
Product Details
Block Diagram
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
Part numbers include: MCZ33789AE, MCZ33789BAE.
SafeAssure 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.
Read more
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Documentation
Quick reference to our documentation types.
5 documents
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Fact Sheet
Automotive Airbag Safety Systems - Fact SheetFeatured
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Reference Manual
ARDRM, Airbag Reference Demonstrator Reference Manual
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Application Note
AN4388: Quad Flat Package (QFP) – Application Note
Design Resources
Engineering Services
To get further assistance directly from NXP, please see our Engineering Services.
2 engineering services
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Independent Design House (IDH)
Hardware/Software Engineering Services
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Independent Design House (IDH)
Hardware/Software Engineering Services
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