[原创] ST ALED1642GW+STM8 16路汽车照明评估方案

ST公司的ALED1642GW是16路LED驱动器,具有误差检测,电流增益控制和12/16位PWM亮度控制,输出电压20V,16个电流源提供3mA到40m A恒流LED驱动电流,满足AECQ100资格认证,电源电压3V-5.5V,高达30MHz 4线接口,具有热关断和超温警报,主要用在全色/单色显示器,仪表盘和汽车内部照明.本文介绍了ALED1642GW主要特性,功能框图和简化应用电路,以及基于ALED1642GW和STM8A汽车照明评估板STEVAL-ILL073V1主要特性,电路图和材料清单.

The ALED1642GW is a monolithic, low voltage,low current power 16-bit shift register designed forLED panel displays. The ALED1642GWguarantees 20 V output driving capability allowingthe user to connect several LEDs in series. In theoutput stage, sixteen regulated current sourcesprovide from 3 mA to 40 mA constant current todrive the LEDs. The current is programmedthrough an external resistor and can be adjustedby a 7-bit current gain register in two subranges.

The brightness can be adjusted separately foreach channel through 12/16-bit grayscale control.Programmable turn-on and turn-off time (fourdifferent values available) improves the low noisegeneration performance of the system.

Open/short error detection mode is available inthe ALED1642GW. The auto power-shutdownand auto power-on features (selectable) allow thedevice to save power without externalintervention.
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