ST L9177A小型机动车引擎控制方案
ST公司的L9177A是采用ST BCD专有技术实现的器件,能够提供全套电源和信号处理外设,以控制低端应用如小型摩托车,微型代步车(K-car), 航海发动机等两缸内燃机.集成了5V主电源稳压器,4V 40mA传感器电源的跟踪稳压器和2.5mA 5V待机用稳压器.此外,两路喷油器驱动器,O2传感器加热器和两个继电器驱动器由两个并行输入和SPI接口来控制,其它的继电器和灯驱动器则由SPI控制,步进马达驱动器用来驱动双线圈绕组马达,用于引擎怠速控制,满足AEC-Q100规范,工作电压6-18V,基本功能低至3.9V.本文介绍了L9177A主要特性, 步进马达驱动器框图, 应用电路图以及评估板EVAL-L9177A主要特性,框图,电路图,材料清单和PCB设计图.
L9177A is a device realized in ST BCD proprietary technology, able to provide the full set of power supplies and signal preprocessing peripherals needed to control a 2 Cylinder internal combustion Engine for Low End Application (e.g. small motorcycle, K-car, nautical engines, etc.).
L9177A integrates a 5 V main voltage regulator, a 5 V 40 mA tracking regulator for sensor supply and a 2.5 mA 5 V standby regulator.
The two channels injector drivers, the O2 sensor heater and two relay drivers can be controlled both with parallel input and with SPI interface. One additional relay driver and the lamp driver are controlled by SPI. The stepper motor driver is designed for a double winding coil motor, used for engine idle speed control.
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