INA220: INA220 application

Nanfang Liao

Intellectual 2085 points

Part Number: INA220

Hello

My customer want to use our INA220 to detect the load current, and they need to detect both positive and negtive current, the bus voltage is 12V, and they need to detect <10mV voltage precision, and detect <5mA current precision

positive current: 200mA to 600mA

negtive current: -200mA to 0mA

Please help to check if the schematic is OK, and also give some recommendation about the Rshunt and register setttings, thanks

over 9 years ago

0 Mayrim Verdejo over 9 years ago

TI__Genius 15770 points

Hi Nanfang,

I have the following comments for the schematic:

For better accuracy I would remove the input resistors. If customer prefers to have filter resistors the value needs to be 10ohms or less.
What is the value of the pull up resistors of SDA and SCL lines? Also why they have 33 ohms in SDA and 0ohms in SCL?

Recommendations for Rshunt resistor:

Please refer your customer to training video session 4:

https://training.ti.com/getting-started-current-sense-amplifiers-session-4-how-choose-appropriate-shunt-resistor

Recommendations for Register settings:

Please refer your customer to Programming section of the datasheet (8.5). Also, refer your customer to training video session 15:

https://training.ti.com/getting-started-current-sense-amplifiers-session-15-programming-power-settings

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INA220: INA220 application