Freescale Semiconductor
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Document Number: MC33814
Rev. 1.0, 8/2012
Two Cylinder Small Engine
Control IC
The 33814 is an engine control analog power IC intended for two cylinder
motorcycle and other small engine control applications. The IC consists of
six integrated low side drivers, three pre-drivers, a Variable Reluctance
Sensor (VRS) input circuit, a voltage pre-regulator using an external pass
transistor, and two 5 volt internal regulators, one for the microcontroller
unit (MCU) VCC supply, and one for use as a protected sensor supply.
Also included is an MCU reset control circuit with watchdog, an ISO 9141
K-Line interface for diagnostic communication and a Serial Peripheral
Interface (SPI). The six low side drivers are intended for driving two fuel
injectors, a lamp, two relays or other loads, and a tachometer. The pre-
drivers are intended to drive IGBT or MOSFET transistors to control
ignition coils, and a HEGO heater. The device is packaged in a 48 pin
LQFP-EP with an exposed pad.
Features:
• Operates over supply voltage range of 4.5 V
V
PWR
36 V
• Logic stability guaranteed down to 2.5 V
• Two fuel injector drivers - typical of 1.3 A each
• Two Ignition IGBT or general purpose gate pre-drivers
• One O2 sensor (HEGO) heater general purpose gate pre-driver
• Relay 1 driver, typically 2.0 A, can be used for fuel pump control
• Relay 2 driver, typically 1.0 A, can be used as power relay control
• Lamp driver, typically 1.0 A can also be used to drive an LED
• V
PROT
protected sensor supply tracks V
CC
+5.0 V regulator
• MCU reset generator - system integrity monitor (watchdog)
• V
PP
pre-regulator provides power for V
CC
and V
PROT
regulators
• Independent fault protection with all faults reported via the SPI
• ISO 9141 K-line interface for communicating diagnostic messages
• Start-up / shut-down control and power sequence logic
• Interfaces directly to MCU using a 5.0 V SPI and logic I/O
• Differential / single-ended VRS conditioning circuit with auto/manual
selected thresholds and filter times with digital and tachometer outputs
.
V
BAT
V
BAT
Keyswitch
33814
TWO CYLINDER SMALL ENGINE
CONTROL IC
98ASA00173D
AE SUFFIX (PB-FREE)
48-PIN LQFP-EP
Applications
Small Engine Control for:
• Lawn Mowers
• Motor Scooters
• Small Motorcycles
• Lawn Trimmers
• Snow Blowers
• Chain Saws
• Gasoline-driven Electrical Generators
• Outboard Motors
MC33814
KEYSW VPROT ROUT2
VPWR
LAMPOUT
ROUT1
TACHOUT
VPPREF
O2HFB
VPPSENS
O2HOUT
VCC
O2HSENSP
RESETB
O2HSENSN
V
BAT
MIL
5.0 V Sensor Supply
Relay 2
(Power)
Relay 1
(Fuel Pump)
TACHOMETER
MCU
O2 Heater
V
CC
+5.0 V
RESETB
SPI
GPIO
GPIO
GPIO
GPIO
GPIO
GPIO
GPIO
GPIO
GPIO
GPIO
GPIO
4
SPI
MRX
MTX
BATSW
RIN1
RIN2
IGNIN1
IGNIN2
INJIN1
INJIN2
VRSOUT
O2HIN
VRSP
VRSN
GND
V
BAT
INJOUT1
Injectors
INJOUT2
ISO9141
IGNFB1
IGNOUT1
IGNFB2
IGNOUT2
IGNSENSP
IGNSENSN
ISO9141
V
BAT
V
BAT
Crankshaft VRS
Figure 1. 33814 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., 2012. All rights reserved.
FREESCALE [ FREESCALE SEMICONDUCTOR, INC ]
