INA214: if GND pin can use negative voltage

zhongfei zhao

Part Number: INA214

In my design, I want to sense about 10-600mA current use 0.045ohm current-sensing resistor. I am concerned that the output may be nonlinear when detecting small currents, so I want to give negative voltage like -5V to the GND pin and short REF pin to system GND. If INA214 can work normally when using negative voltage with GND pin.

over 1 year ago

0 Amy Luo over 1 year ago

TI__Guru**** 185470 points

您好，

您是担心在小幅值输出时，不在 INA214输出范围是吗？

您可以在INA214 REF管脚接一个电压，让INA214 输出以此参考电压输出。如果您测量的电流是双向的，一般REF管脚推荐接供电电压的中间值，即若5V供电，REF接2.5V，这样输出在2.5V基准上上下摆动。

0 zhongfei zhao over 1 year ago in reply to Amy Luo

Intellectual 300 points

我的设计中只会涉及单向电流。我可以在REF pin上供一个特定电压，比如0.2V，但是这个0.2V的电压精度我比较担心。我想，如果能在GND pin上添加上负电压并在REF pin接系统地，就能保证低电压输出时的线性度跟精度，所以我想确认下GND pin上是否允许接负电压并在REF pin上接系统GND。