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Freescale Semiconductor Electronic Components Datasheet

MC33797 Datasheet

Four Channel Squib Driver

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Freescale Semiconductor
Technical Data
Four Channel Squib Driver IC
The Four Channel Squib Driver IC is 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. The device contains a serial peripheral
interface (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 the high- and
low-side output drivers are protected against temporary shorts to
battery or ground. The current limit threshold is set by an external
resistor.
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)
• Pb-Free Packaging designated by Suffix Code EK
MC33797
Rev 2.0, 07/2005
33797
SQUIB DRIVER
EK SUFFIX (Pb-Free)
98ARH99137A
32-TERMINAL SOICW
ORDERING INFORMATION
Device
MC33797EK/R2
Temperature
Range (TA)
-40°C to 85°C
Package
32 SOICW
33797
VPWR
VIN VBOOST1
TYPICAL
AIR BAG
POWER SUPPLY
FIRING
CAP
VDIAG_1
VFIRE_1A
VFIRE_1B
/4
SQB_HI
SENSE /4
SQUIB
(1A, 1B, 2A, 2B)
VBOOST2
VDIAG_2
SQB_LO /4
5.0 V
FIRING
CAP
VFIRE_2A
VFIRE_2B
/2
VFIRE_RTN
MICROPROCESSOR
ENABLE
ENABLE
VDD
CS
CLK
MISO
MOSI
RST
FEN_1
FEN_2
R_LIMIT_1
R_LIMIT_2
R_DIAG
GND
Figure 1. 33797 Simplified Application Diagram
* This document contains certain information on a new product.
Specifications and information herein are subject to change without notice.
© Freescale Semiconductor, Inc., 2005. All rights reserved.


Freescale Semiconductor Electronic Components Datasheet

MC33797 Datasheet

Four Channel Squib Driver

No Preview Available !

INTERNAL BLOCK DIAGRAM
INTERNAL BLOCK DIAGRAM
VFIRE_2A
SQB_HI_2A
SENSE_2A
SQB_LO_2A
VFIRE_RTN
SQB_LO_2B
SENSE_2B
VFIRE_1A
SQB_HI_1A
SENSE_1A
SQB_LO_1A
VFIRE_RTN
SQB_LO_1B
SENSE_1B
SQB_HI_2B
RST
R_DIAG
GND
SQB_HI_1B
R_LIMIT_1
R_LIMIT_2
Figure 2. 33797 Simplified Internal Block Diagram
33797
2
Analog Integrated Circuit Device Data
Freescale Semiconductor


Part Number MC33797
Description Four Channel Squib Driver
Maker Freescale Semiconductor
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MC33797 Datasheet PDF






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