INA237: Measured value and VI monitor reading values are different

Anoop M

Part Number: INA237
Other Parts Discussed in Thread: SYSCONFIG

HI,

We are getting different current readings from Ina 237.
Each reading has a 150mA difference. If you have any sample program or sample calculation, please share it it with me.

1)circuit input 48V/1A max ,1mE sensing resistor

Thanks, regards,

Anoop

over 1 year ago

0 Mitch M over 1 year ago

TI__Mastermind 22065 points

Hello Anoop,

With a maximum current of 1A, and a sensing resistor of 1mΩ, your full scale rage is just 1mV.... That is a very small percentage of the ±40.96mV (or ±163.84mV) sensing rage. To increase accuracy, you will want to adjust your shunt resistor to fully utilize the full scale measurement range. Here is a link to an app not that will help you pick an appropriate shunt resistor:

https://www.ti.com/lit/pdf/sboa511

That app note uses this calculator tool:

https://www.ti.com/tool/download/SBOR021

As, if you are interested, here is a link to SysConfig, that can help with firmware development:

https://dev.ti.com/sysconfig/index.html?product=ascstudio&module=/ti/sensors/currentsensor/INA237

Regards,

Mitch