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33797 Datasheet(PDF) 1 Page - Freescale Semiconductor, Inc |
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33797 Datasheet(HTML) 1 Page - Freescale Semiconductor, Inc |
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1 / 34 page  Document Number: MC33797 Rev 3.0, 11/2006 Freescale Semiconductor Advance Information * This document contains certain information on a new product. Specifications and information herein are subject to change without notice. © Freescale Semiconductor, Inc., 2006. 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. Figure 2. 33797 Simplified Application Diagram SQUIB DRIVER 33797 ORDERING INFORMATION Device Temperature Range (TA) Package MC33797EK/R2 -40°C to 85°C 32 SOICW MCZ33797EK/R2 EK SUFFIX (PB-FREE) 98ARH99137A 32-PIN 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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