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DAC8830: DAC8830输出电压问题

Part Number: DAC8830

问题1:DAC8830输出电压一直保持不变;

问题2:DAC8830上电,输出不复位到0,输出电压值是上次断电前输入的数据;

SPI引脚时序图SDI与SCLK,SCLK与CS,由于只有两通道示波器,所以分成了两次抓拍了这三个引脚了时序;

上图为DAC8830上电就输出一个电压值,没有上电复位到0,波形绿色为电源,黄色为输出电压;

上图为电路设计图