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DS90UB948-Q1: FPD-LINK-III的从片DS90UB948的I2C地址跳变问题

Part Number: DS90UB948-Q1

Hi Ti engineer

在使用TI的FPD-LINK 给商用车供导航的过程中,发现了DS90UB949识别到从片DS90UB948的地址发生跳变,导致偶尔上电后黑屏的情况,还请帮忙分析一下具体原因,,谢谢!

 SCHEMATIC1 _ 02_Decoder_DS90UB9.pdf

  • 您好,您是怎么判断地址发生跳变的?948的地址是由IDx引脚的上下拉阻值大小决定的。

    上电后黑屏,我怀疑和I2C地址没关系,可能和上电时序有关,是否用示波器测试上电时序,验证下PDB和电源的上电时序是否满足: