您好，
您是使用的LMP91000EVM吗，在LMP91000EVM用户指南里有说明：www.ti.com/.../snau121a.pdf
下面摘自用户指南文档：
2.5.2. Power supply
1. Remove R7 resistor
2. Connect a supply voltage (2.7V to 5.25V) between VDD test point and GND test point
2.5.3. Voltage reference
If the on board 2.5V voltage reference fits the requirements of the application, do not accomplish the following steps.
1. Remove R6 resistor
2. Connect a reference voltage (1.5V to VDD) between VREF test point and GND test point
