MC33814: Two Cylinder Small Engine Control IC

Overview

The NXP^® 33814 is an engine control analog power IC delivering a cost-optimized solution for managing one and two-cylinder engines.

With six drivers, three pre-drivers, a 5.0 V regulator for the MCU, a protected external sensor supply, and a 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.
The device is packaged in a 48 pin LQFP with an exposed pad for a minimum space footprint.

Operates over supply voltage range of 4.5V < VPWR < 36V
Start-up/shut-down control and power sequence logic with KEYSW input
MCU supply: VCC is a 5.0V (±2.0%, 200 mA) regulated supply
Sensor supply: VPROT (100 mA) is a VCC tracking protected sensor supply
Two configurable pre-drivers for IGBT or general purpose gate MOSFETs for
ignition and O2 sensor (HEGO) heater:
- PWM
- Overcurrent shutdown
- Short-to-battery shutdown
Six low-side drivers with full diagnostics, self-protection and PWM control:
- Two fuel injector drivers, RDS(on) = 0.6 Ω, ILIMIT = 1.8 A, to drive typical 12 Ω
- high-impedance injectors
- Relay 1 driver, RDS(on) = 0.4 Ω, ILIMIT = 3.0 A, to drive fuel pump
- Relay 2 driver, RDS(on) = 1.5 Ω, ILIMIT = 1.2 A, to drive power relay
- Lamp driver, RDS(on) = 1.5 Ω, ILIMIT = 1.2 A, to drive warning lamp or an LED
- Programmable Tachometer Driver, RDS(on) = 20 Ω, Ishutdown = 60 mA, to drive
- a Tachometer display
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 5.0V IO capability

Operates over supply voltage range of 4.5V < VPWR < 36V
Start-up/shut-down control and power sequence logic with KEYSW input
MCU supply: VCC is a 5.0V (±2.0%, 200 mA) regulated supply
Sensor supply: VPROT (100 mA) is a VCC tracking protected sensor supply
Two configurable pre-drivers for IGBT or general purpose gate MOSFETs for
ignition and O2 sensor (HEGO) heater:
- PWM
- Overcurrent shutdown
- Short-to-battery shutdown
Six low-side drivers with full diagnostics, self-protection and PWM control:
- Two fuel injector drivers, RDS(on) = 0.6 Ω, ILIMIT = 1.8 A, to drive typical 12 Ω
- high-impedance injectors
- Relay 1 driver, RDS(on) = 0.4 Ω, ILIMIT = 3.0 A, to drive fuel pump
- Relay 2 driver, RDS(on) = 1.5 Ω, ILIMIT = 1.2 A, to drive power relay
- Lamp driver, RDS(on) = 1.5 Ω, ILIMIT = 1.2 A, to drive warning lamp or an LED
- Programmable Tachometer Driver, RDS(on) = 20 Ω, Ishutdown = 60 mA, to drive
- a Tachometer display
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 5.0V IO capability