Survey -- 2 rail power monitor part -- 3.3V@5A /Smbus

Delun Kao

Intellectual 265 points

Other Parts Discussed in Thread: INA3221, INA228, INA237, INA260

HI TI,

There is currently a project that will require two-rail power monitoring. Is there a recommended IC?

Can the address of smbus be set by myself?

Br,

Delun

over 3 years ago

0 Delun Kao over 3 years ago

Intellectual 265 points

0 Javier Contreras4 over 3 years ago in reply to Delun Kao

TI__Mastermind 26485 points

Hello Delun,

We have many options that you can narrow down here. The first question is do you need a Dual channel. Unfortunate we only have singles and a three channel device.

3channel- INA3221.

If you are looking for single we just started sampling the INA228 with 20 bit resolution. Or lower cost INA237 with 16 bits or resolution.

About the I2C address each device will have limited addresses you can use and normally controlled through address pins.

0 Delun Kao over 3 years ago in reply to Javier Contreras4

Intellectual 265 points

HI Javier,

Because of space considerations, INA260 has Integrated Resistor, I think it might be more helpful to me, Or do you have better suggestions?

The attachment is my expected schematic, can you help to confirm? thanks.

BR,

Delun

0 Javier Contreras4 over 3 years ago in reply to Delun Kao

TI__Mastermind 26485 points

Hello Delun,

The schematic looks fine just be aware that all the pull-ups resistors are in parallel. If you add more I2C pins you will have a much larger load if you include a pull up resistor for each device.

0 Delun Kao over 3 years ago in reply to Javier Contreras4

Intellectual 265 points

Hi Javier,

If the pull up resistance is changed from 10k to 4.7k, will it be better than now?

BR,

Delun

0 Javier Contreras4 over 3 years ago in reply to Delun Kao

TI__Mastermind 26485 points

Delun,

You can keep it at 10k. I was just mentioning if you have other pull up resistors(not on this schematic page) you may need to be aware they are all in parallel and can decrease your overall pull up resistance.

Power management

Power management forum

Survey -- 2 rail power monitor part -- 3.3V@5A /Smbus