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DAC7554: DAC7554刚上电时有概率不输出,多次上电又会正常,请问是什么原因?

Part Number: DAC7554

我们电路板使用DAC7554驱动,有时刚上电时不能正常输出电压驱动恒流源电点亮LED,这时不能正常驱动电压后程序中一直间隔100ms驱动后DAC也不能正常输出,请问这是因为什么原因?电路板MCU有复位电路,复位多次后很可能又会正常。