Document Number: MC33814 NXP Semiconductors Rev. 14, 10/2020 Technical Data Two cylinder small engine control IC 33814 Powered by SMARTMOS technology, the 33814 delivers a cost-optimized IC solution for managing one and two-cylinder engines. With six drivers, three pre- TWO CYLINDER SMALL ENGINE drivers, a 5.0 V regulator for the MCU, a protected external sensor supply, and a CONTROL IC high level of integration, the IC offers an ideal response to contemporary market requirements. The innovative VRS system optimizes noise immunity under cranking conditions. Diagnostic and protection features present on all outputs allow applications to operate with greater safety. Features: Operates over supply voltage range of 4.5 V < V < 36 V PWR Start-up/shutdown control and power sequence logic with KEYSW input MCU supply: V is a 5.0 V (2.0 %, 200 mA) regulated supply CC Sensor supply: V (100 mA) is a V tracking protected sensor supply PROT CC Three configurable pre-drivers for IGBT or general purpose gate MOSFETs for 98ASA00737D ignition and O sensor (HEGO) heater: 2 AE SUFFIX (PB-FREE) PWM 48-PIN LQFP-EP Overcurrent shutdown Short-to-battery shutdown Applications: Six low-side drivers with full diagnostics, self-protection and PWM control: Small Engine Control for: Two fuel injector drivers, R = 0.6 , I = 1.8 A, to drive typical 12 DS(on) LIMIT Motor scooters high-impedance injectors Small motorcycles Relay 1 driver, R = 0.4 , I = 3.0 A, to drive fuel pump Lawn mowers DS(on) LIMIT Relay 2 driver, R = 1.5 , I = 1.2 A, to drive power relay Lawn trimmers DS(on) LIMIT Lamp driver, R = 1.5 , I = 1.2 A, to drive warning lamp or an LED Snow blowers DS(on) LIMIT Chain saws Programmable Tachometer Driver, R = 20 , I = 60 mA, to drive DS(on) shutdown Gasoline-driven electrical generators a Tachometer display Outboard motors Innovative configurable VRS conditioning circuit, with two different parameter settings for engine cranking and running mode and an optional automatic mode to improve noise immunity in cranking conditions K-line (ISO9141) MCU reset generator and programmable watchdog MCU Interface: 16-bit SPI and parallel interface with 5.0 V IO capability . MC33814 V BAT 5.0 V Sensor Supply Keyswitch V BAT V BAT KEYSW VPROT Relay 2 ROUT2 VPWR MIL (Power) LAMPOUT VPPREF ROUT1 Relay 1 (Fuel Pump) TACHOUT VPPSENS TACHOMETER O2HFB O2 Heater MCU V O2HOUT CC VCC +5.0 V O2HSENSP RESETB RESETB O2HSENSN V BAT 4 SPI SPI INJOUT1 Injectors GPIO MRX V BAT GPIO MTX INJOUT2 GPIO BATSW GPIO RIN1 ISO9141 ISO9141 GPIO RIN2 GPIO IGNIN1 IGNFB1 GPIO IGNIN2 IGNOUT1 GPIO INJIN1 IGNFB2 GPIO INJIN2 IGNOUT2 GPIO VRSOUT GPIO O2HIN VRSP IGNSENSP V BAT VRSN IGNSENSN GND Crankshaft VRS Figure 1. 33814 simplified application diagram NXP B.V. 2020.Table of Contents 1 Orderable parts . 3 2 Internal block diagram 4 3 Pin connections . 5 3.1 Pinout diagram . 5 3.2 Pin definitions 5 4 General product characteristics . 8 4.1 Maximum ratings 8 4.2 Static electrical characteristics 10 4.3 Dynamic electrical characteristics 16 4.4 Timing diagrams . 18 4.5 Typical electrical characteristics . 19 5 General IC functional description and application information . 22 5.1 System controller 22 5.2 Watchdog 27 5.3 System reset 30 5.4 Power supplies 31 5.5 Drivers blocks . 34 5.6 Pre-driver 42 5.7 VRS circuitry 47 5.8 ISO9141 bus 54 5.9 Mode code and revision number . 55 5.10 SPI . 55 5.11 SPI registers mapping . 58 6 Typical applications . 65 6.1 Output OFF open load fault . 65 6.2 Low-side injector driver voltage clamp 65 6.3 Reverse battery protection . 65 7 Packaging . 66 7.1 Package mechanical dimensions 66 8 Revision history 69 33814 2 NXP Semiconductors