MC33789FS Datasheet, PDF (2/2 Pages) Freescale Semiconductor, Inc – Airbag system basis chip (SBC) with power supply and PSI5 sensor interface

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
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 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.
Performance
Performance
Operating Voltage
Energy Reserve and Squib Firing Supply
V_CC Supply
Selectable Switch Input Detector Supplies
Configurable Driver
Output Voltage
Output Current
PWM Frequency
Analog Output Voltage
ESD (HBM)
Ambient Operating Temperature (T_A)
Junction Temperature (T_J)
Typical Values
5.2 V ≤ V_PWR ≤ 20 V
33 V
5.0 V
1.5 V, 2.5 V, 5.0 V, 6.5 V
0 V / V_PWR
Min 70 mA
128 Hz
0 V ≤ V_AOUT ≤ V_CC
±2000 V
-40 °C to+125 °C
-40 °C to+150 °C
Protection
Protection
Over-voltage
Over-current/SC
Over-temperature
Open load
Detect
•
•
•
•
Limiting
•
Shut Down
•
•
•
Auto Retry
•
•
Status
Reporting
•
•
•
•
Ordering Information
Part 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
Airbag System Basis Chip (SBC) with
Power Supply and PSI5 Sensor Interface - Data Sheet
SG1002
Analog and Power Management device comparison - Selector Guide
SG187
Automotive Selector Guide
Benefits
• Master interface supports the PSI5
.
standard, V1.3.
• Provides an integrated solution for almost
all auxiliary functions in a typical airbag
control module
• Automotive temperature range and
qualification
• Suitable for uses from low squib count to
high squib count airbag systems
AE SUFFIX (PB-FREE)
EXPOSED PAD
98ASA10763D
64-PIN LQFP
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Document Number: MC33789FS, Rev. 2.0