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ADS124S08典型应用——Three Wire RTD,电流源配置好了但是没有输出

 

这是芯片手册上给的电路图,我照着这个原理图画了PCB

按照下表,我选择的是500uA的电流输出,参考电阻选择的3.6K(实测3.54K

其它电阻电容我参考的手册:

现在能通过SPI对寄存器进行正常的读和写,且寄存器读出来的值跟下表一样:


但是测试RTD两端的电压一直为0,测试RBIAS两端的电压也为0,现在找不到问题所在,求大神解答。