Datasheet > 33797

33797

更新时间： 2022-04-23 23:00:11

品牌	Logo	应用领域
飞思卡尔 - FREESCALE		驱动器
页数	文件大小	规格书
34页	579K
描述
Four Channel Squib Driver IC

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33797 数据手册

Document Number: MC33797

Rev 3.0, 11/2006

Freescale Semiconductor

Advance Information

Four Channel Squib Driver IC

33797

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.

SQUIB DRIVER

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

EK SUFFIX (PB-FREE)

98ARH99137A

32-PIN SOICW

• 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)

ORDERING INFORMATION

Temperature

Package

Device

Range (T )

• Pb-Free Packaging designated by Suffix Code EK

MC33797EK/R2

MCZ33797EK/R2

-40°C to 85°C

32 SOICW

Figure 1.

33797

VIN

VBOOST1

VDIAG_1

SQB_HI

V_PWR

SQUIB

(1A, 1B, 2A, 2B)

TYPICAL

VFIRE_1A

AIR BAG

FIRING

CAP

SENSE

POWER SUPPLY

VFIRE_1B

VDIAG_2

VBOOST2

SQB_LO

VFIRE_RTN

VFIRE_2A

VFIRE_2B

FIRING

CAP

5.0 V

R_LIMIT_1

R_LIMIT_2

VDD

CLK

R_DIAG

MISO

MOSI

RST

ENABLE

FEN_1

FEN_2

MICROPROCESSOR

GND

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.

12 3 4 5 6 7...34

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