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MC33797 Fiches technique(PDF) 1 Page - Freescale Semiconductor, Inc

No de pièce MC33797
Description  Four Channel Squib Driver IC
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Fabricant  FREESCALE [Freescale Semiconductor, Inc]
Site Internet  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

MC33797 Fiches technique(HTML) 1 Page - Freescale Semiconductor, Inc

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MC33797
Rev 2.0, 07/2005
Freescale Semiconductor
Technical Data
* 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.
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
Figure 1. 33797 Simplified Application Diagram
SQUIB DRIVER
33797
ORDERING INFORMATION
Device
Temperature
Range (TA)
Package
MC33797EK/R2
-40°C to 85°C
32 SOICW
EK SUFFIX (Pb-Free)
98ARH99137A
32-TERMINAL SOICW
VDIAG_2
VFIRE_1A
VDIAG_1
FEN_1
FEN_2
CS
VFIRE_2B
VDD
VFIRE_2A
SQB_HI
SENSE
VFIRE_RTN
SQB_LO
R_LIMIT_2
GND
VFIRE_1B
R_LIMIT_1
R_DIAG
MOSI
CLK
MISO
33797
FIRING
CAP
FIRING
CAP
VPWR
TYPICAL
AIR BAG
POWER SUPPLY
VIN
VBOOST1
VBOOST2
ENABLE
ENABLE
SQUIB
(1A, 1B, 2A, 2B)
/4
/4
/4
/2
MICROPROCESSOR
RST
5.0 V


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