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TLC2551不能正常工作

user1903213
Intellectual 346 points
Other Parts Discussed in Thread: TLC2551, MSP430F149, TLV2541

硬件设计为：

操作TLC2551的SPI时钟频率为500KHz；

读时序参照《SLAA171--Interfacing the TLV2541 to the MSP430F149》，

自己用示波器测试到的时序如下；

模拟输入口的电压是固定的2.46V，

但是每次读到的值都不同；

程序如下：

问题：

1. 为什么蓝色通道的SDO空闲时会有1V左右的跟随CLK的波形？

2. 软件读不到值