MC33814 Datasheet, PDF (1/50 Pages) Freescale Semiconductor, Inc – Two Cylinder Small Engine Control IC

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Document Number: MC33814
Rev. 1.0, 8/2012
Two Cylinder Small Engine
Control IC
33814
The 33814 is an engine control analog power IC intended for two cylinder
motorcycle and other small engine control applications. The IC consists of
TWO CYLINDER SMALL ENGINE
CONTROL IC
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
98ASA00173D
AE SUFFIX (PB-FREE)
48-PIN LQFP-EP
• Two fuel injector drivers - typical of 1.3 A each
Applications
• 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
Small Engine Control for:
• Lawn Mowers
• Motor Scooters
• Small Motorcycles
• Lawn Trimmers
• Snow Blowers
• Chain Saws
• Gasoline-driven Electrical Generators
• Outboard Motors
• 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
Keyswitch
V_BAT
MC33814
KEYSW
VPWR
VPROT _ROUT2
LAMPOUT
V_BAT
MIL
5.0 V Sensor Supply
Relay 2
(Power)
MCU
V_CC
+5.0 V
RESETB
VPPREF
VPPSENS
VCC
RESETB
ROUT1
TACHOUT
O2HFB
O2HOUT
O2HSENSP
O2HSENSN
TACHOMETER
Relay 1
(Fuel Pump)
O2 Heater
SPI
4
GPIO
GPIO
GPIO
GPIO
GPIO
GPIO
GPIO
GPIO
GPIO
GPIO
GPIO
Crankshaft VRS
SPI
MRX
MTX
BATSW
RIN1
RIN2
IGNIN1
IGNIN2
INJIN1
INJIN2
VRSOUT
O2HIN
VRSP
VRSN
GND
INJOUT1
INJOUT2
ISO9141
IGNFB1
IGNOUT1
IGNFB2
IGNOUT2
IGNSENSP
IGNSENSN
V_BAT
Injectors
V_BAT
ISO9141
V_BAT
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.