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请教下ADS1130的问题

Other Parts Discussed in Thread: ADS1130, ADS1131

TI大神们及各位网友大虾们:

         最近使用TI的ADS1130采集电阻桥式传感器的输出值遇到一点问题:

1、我将VREFN与SW两脚相连了,但是为什么VREFN脚上的电压不为0啊,看到手册上说要将SW与GND连接起来,可是应该怎么连接起来呢?硬件直接连接还是软件设置?

2、有参考程序吗?对应STM32系列MCU的,麻烦提供一下。