Document Number: MC33812

Rev. 4.0, 7/2009

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., 2009. All rights reserved.

Multifunctional Ignition and

Injector Driver

The 33812 is an engine control analog power IC intended for

motorcycle and other single/dual cylinder small engine control

applications. The IC consists of three integrated low side drivers, one

pre-driver, a +5.0 V, voltage pre-regulator, an MCU watchdog circuit,

an ISO 9141 K-Line interface, and a parallel interface for MCU

communication. The three low side drivers are provided for driving a

fuel injector, a lamp or LED, and a relay or other load. The pre-driver

is intended to drive either an Insulated Gate Bipolar Transistor (IGBT)

or a bipolar Darlington transistor to control an ignition coil.

Features:

• Designed to operate over the range of ~4.7 V

• Fuel Injector driver - Current Limit - 4.0 A Typical

• Ignition pre-driver can drive IGBT or Darlington bipolar junction

transistors

• Ignition pre-driver has independent high and low side outputs

• Relay driver - Current Limit - 4.0 A Typical

• Lamp driver- Current Limit - 1.5 A Typical

• All external outputs protected against short to battery, over-current

• Ignition and other drivers protected against over-temperature

• Interfaces directly to MCU Using 5.0 V parallel interface

• VCC voltage pre-regulator provides +5.0 V power for the MCU

• MCU Power On RESET generator

• MCU watchdog timer circuit with parallel refresh/time setting line

• Independent fault annunciation outputs for ignition, injector and relay drivers

• ISO-9141 K-Line transceiver for communicating diagnostic messages

• Pb-free packaging designated by suffix code EK

Figure 1. 33812 Simplified Application Diagram

SMALL ENGINE CONTROL IC

33812

*Note: AEC qualified for automotive applications

ORDERING INFORMATION

Device

Temperature

Package

MCZ33812EK/R2

-40° to 125°C

32 SOICW-EP

EK Pb-FREE SUFFIX

98ASA10556D

32 Pin SOICW EP

MRX

33812

LAMPOUT

MCU

RESET

ROUT

RELAY OR

MIL

RESET

VCC

MTX

INJIN

VCCSENS

DGND

+5 V

IGNIN

IGNOUTH

ISO9141

ISO9141

IGNFB

VCCREF

INJOUT

INJECTOR

GPIO

RXD

TXD

PGND1,2

WD_INH

TM_EN, TEST2

GPIO

GPIO

WDRFSH

INJFLT

IGNFLT

GPIO

GPIO

LAMPIN

RIN

GPIO

GPIO

IGNSUP

PNP

IGNOUTL

(IGBT DRIVER SHOWN)

OTHER LOAD

Note: Surge Voltage protection recommended on VPWR

GPIO

RELFLT

+5 V

VPWR