INA226 , INA228 red module

[oduled]

Hello, Could you add connection diagram for the red module with 0.002ohm shunt resistor?
Did you try using same module with INA228 ?

[wollewald]

Hi @oduled , I have added a circuit diagram for the red module. There are different options: you can apply it on the high side, on low side, and you can include the shunt vor the bus voltage and power measurements or not.
Important is to not use the small In-/In+ connectors, but the bigger connectors which are labelled as "Current + / -". For reasons I don't understand there are 4.7 ohm resistors between In+ and the shunt and between In- and the shunt. To me this makes no sense.

I have not seen an INA228 module anywhere. Have you found it somewhere? If yes, I would be interested in a link.

I was thinking about including other INAxxx current and power sensors but there are so many:
https://www.ti.com/amplifier-circuit/current-sense/digital-power-monitors/products.html
Maybe I will have a closer look into the ones which have three or four channels.

I hope this answers your questions.

[wollewald]

A short addition to my comment: The 4.7 ohm resistors do make sense. It seems that the developers of the modules have followed the recommendations in the datasheet and added a filter:

But if you let your load current flow through the IN+/IN- connectors on the module, the INA226 measures the voltage drop over the two 4.7 ohm and the shunt resistor - and that makes no sense and is very confusing.

[oduled]

Hi,
Thanks that you update library and schematic diagram
I bought INA228 from AliExpress ,It's with same INA226 PCB, chip pinout is the same.
What I need to do for using it in fast mode(400kHz) or High speed mode 2.94MHz?
What is the short amplitude pulse that I can measure with it?

[wollewald]

Hi @oduled , the INA226 and the INA228 may have the same pinout but internally they are very different. For example: the INA228 has 20 registers, the INA 226 has only 10. The INA228 is a 20 bit device, The INA226 is a 20 bit device. If I planned to write a library for the INA228, it would be a separate one. It's not much code which could be recycled.

I found two other libraries on Github which you could try:
https://github.com/adafruit/Adafruit_INA228
https://github.com/RobTillaart/INA228

Meanwhile I have also found IN228 based modules. I will order some and test the libraries. Depending on the result I might write an own library, but even if I decide to do this, it will take time.