Freescale and the Freescale logo are trademarks of Freescale Semiconductor, Inc., Reg. U.S. Pat. & Tm. Off. Qorivva, SafeAssure and
Xtrinsic are trademarks of Freescale Semiconductor, Inc. All other product or service names are the property of their respective owners.
The Power Architecture and Power.org word marks and the Power and Power.org logos and related marks are trademarks and service
marks licensed by Power.org. © 2012 Freescale Semiconductor, Inc.
Document Number: MC33789FS, Rev. 3.0
For more information, please visit freescale.com
system supplier who addressed the
need for low cost vs. flexibility.
• Question – Is the MC33789’s PSI5
Interface interoperable with other
PSI5 products?
Answer – Yes, Freescale is part of
the PSI5 consortium and has an
ecosystem of crash sensor parts that
communicate with the MC33789. The
MC33789’s PSI5 master interface
supports the P10P 500/3L operation
mode specified in the PSI5 standard
V1.3.
Questions
• Question – Why are there no squib
drivers integrated?
Answer – The number of squib
drivers varies across vehicle
platforms so a fixed number could
be too many or not enough for an
application.
• Question – What drove the MC33789
final silicon partition?
Answer – The MC33789 was the
result of collaboration between
Freescale and a leading airbag
SafeAssure
The MC33789, a SafeAssure solution, is
well suited for use in low to high end airbag
safety systems by allowing the designer
to scale a design for the number of firinig
loops needed while providing enhanced
safety and system reliability.
SafeAssure Program:
Functional Safety, Simplified
Freescale’s SafeAssure functional safety
program is designed to help system
manufacturers more easily achieve system
compliance with functional safety standards:
International Standards Organization (ISO)
26262 and International Electrotechnical
Commission (IEC) 61508. The program
highlights Freescale solutions – hardware
and software – that are optimally designed
to support functional safety implementations
and come with a rich set of enablement
collateral. For more information, visit
freescale.com/safeassure.
MC33789 Key Features
• Designed to operate 5.2 V < V
PWR
< 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 master
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
supplies for squib firing (33 V), satellite
sensors (6.3 V), and local ECU
sensors and logic circuits (5.0 V)
• Nine configurable switch input monitors
for simple switch and Hall-effect sensor
interfaces with internal power supply
• 16-bit SPI interface
• LIN 2.1 physical layer interface.
Protection, Performance, and Ordering Information
Performance
Performance Typical Values
Operating Voltage
5.2 V < V
PWR
< 20 V
Energy Reserve and Squib Firing
Supply
33 V
VCC Supply 5.0 V
Selectable Switch Input Detector
Supplies
1.5 V, 2.5 V, 5.0 V, 6.5 V
Configurable Driver
Output Voltage
Output Current
PWM Frequency
0 V / V
PWR
Min 70 mA
128 Hz
Analog Output Voltage 0 V < V
AOUT
< V
CC
ESD (HBM) ±2000 V
Ambient Operating Temperature (T
A
) -40 °C to +125 °C
Junction Temperature (T
J
) -40 °C to +150 °C
Protection
Protection Detect Limiting Shut Down Auto Retry Status Report
Over-voltage
••••
Over-current/SC
•• • •
Over-temperature
••••
Open load
••
Ordering Information
Order Number Temperature Range Package
MCZ33789AE/R2 - 40 °C to 125 °C 64 LQFP-EP
Contact Sales Evaluation board to demonstrate the key features of the MC33789
MC33789
Data Sheet - Airbag System Basis Chip (SBC) w/ Power Supply and PSI5
Sensor
SG1002 Selectable Switch Input Detector Suppliesr
SG187 Automotive Selector Guide
