MCZ33797 Datasheet | Freescale Semiconductor

features are incorporated to provide fail-safe operation. The device contains a serial peripheral interface (SPI) patible 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, municated 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. SQUIB DRIVER EK SUFFIX (PB-FREE) 98ARH99137A 32-PIN SOICW ORDERING INFORMATION Device MC33797EK/R2 MCZ33797EK/R2 -40°C to 85°C 32 SOICW Temperature Range (TA) Package VPWR VBOOST1 TYPICAL AIR BAG POWER SUPPLY VBOOST2 FIRING CAP FIRING CAP VDIAG_1 VFIRE_1A VFIRE_1B VDIAG_2 VFIRE_2A VFIRE_2B VDD CS CLK MISO MOSI RST FEN_1 FEN_2 R_LIMIT_1 R_LIMIT_2 SENSE SQB_LO VFIRE_RTN SQB_HI /4 SQUIB (1A, 1B, 2A, 2B) /4 /4 /2 5.0 V R_DIAG MICROPROCESSOR ENABLE ENABLE Figure 2. 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., 2006. All rights reserved. INTERNAL BLOCK DIAGRAM INTERNAL BLOCK DIAGRAM VFIRE_2B VDIAG_2 FEN_2 FEN_1 VDIAG_1 VFIRE_1B...