Part Number: TIDA-01608 Other Parts Discussed in Thread: INA260 , INA226-Q1 , INA239-Q1 Hi,
I am developing an application to measure the current from a 12V Vehicle battery in different load conditions,
the voltage will be in between +11 V to 13V maxim…
Hello Kevin,
No, these grounds cannot be left disconnected, or the common mode voltage spec limit may be violated and the device could get damaged. If you need a separate GND between between the MCU and the load, then you have a couple options:
Add a…
Hi Chase,
You have many options for this. Our shunt based devices (the INA series) can't typically handle that high of voltage on their own, but we have this reference design for the INA226 ( https://www.ti.com/tool/TIDA-00639 ) that allows you to…
Hello Shivaraj,
The EVM you are looking for is the INA4235EVM or INA4230EVM, found here: https://www.ti.com/tool/INA423XEVM . For a voltage measurement, our device can only handle a positive common mode voltage, up to 48V, so it will not work with your…
Hello Mp,
The problem is most likely a logic level issue between the Isolator and the INA. Check the logic thresholds (especially logic low thresholds) to make sure your isolator is compatible. Note that most isolators have different specs for each side…
Hi Ann, The INA238's datasheet has reference block diagrams in the Applications section - Section 8.2. Also, please note that this solution of using an rectifier and voltage divider would only work if the INA238 is being used for low-side sensing. I…
Hey Zabieru-san ,
In addition to what Clemens said, here are some reference designs using an isolator that you can use as a reference:
https://www.ti.com/tool/TIDA-01608 (with an integrated shunt: INA260)
https://www.ti.com/tool/TIDA-00313 (external shunt…
Hey Sivam,
Clemens is correct that our device needs to be on the same ground as what it is measuring. An isolated ADC is one good option. Another option if you still want to use the INA226 would be to use a digital isolator, or mirror the current to a…
Hello Abhijith,
You will not be able to measure the VBUS voltage in this configuration because the GND for the INA237 and the load are not shared. The GND for the INA237 and the load must be the same in order to read voltage.
You can use an isolator to…
Hello Parth
Thank you for using the TI forum. You can accomplish this though either mirroring the current or sensing low side and dividing down the bus voltage. Here are a few examples:
Mirroring current (shunt on the high-side):
https://www.ti.com/tool…
