BQ27520-G4: Resolution of current detection.

Kengo.Y

Part Number: BQ27520-G4

Hi team,

I'd like to measure currents under 1mA.
Do you have any ideas to do this?

And then,
what is the problem with current sense values outside the recommended range?

BR,
Kengo.

11 months ago

0 Jonny 11 months ago

TI__Mastermind 22681 points

Hello Kengo,

Please refer to this Application Report on Enhanced Resolution Gauging for Low Current Applications Using Scaling. I believe this document covers what you are asking.

Regards,

Jonny.

0 Kengo.Y 10 months ago in reply to Jonny

Guru 10880 points

Hi Jonny,

I read the application note you gave me.
I also tried Deadband=0 , but could not read less than 1mA.
Is there any other way?

0 Jonny 10 months ago in reply to Kengo.Y

TI__Mastermind 22681 points

Hello Kengo,

The document I provided goes over the recommended way to achieve higher resolution for lower currents. With that being said, the gauge won't report a current lower than 1mA due to the fact that the register is not configured to report floating point (i.e. down to uA resolution), but the gauge should still measure these lower currents, it just won't report them when you poll the register.

Regards,

Jonny.

Power management

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BQ27520-G4: Resolution of current detection.