BQ76952: Conversion the 24 bits ADC cell current data to userA data.

Dan Groswirth1

Part Number: BQ76952

Hi again:

Based on your previous answer, is the eq. 1 bit = VREF2 / (5 * 2^23) = 29.564nV for current calculation is also applied for calculation of the 24 bits cell current data that can be read by reading registers 0x0071, 72 etc. ?

Please advise the right conversion the 24 bits ADC data to userA data.

Thanks

Dan

over 4 years ago

0 Matt Sunna over 4 years ago

TI__Guru* 81034 points

Hi Dan,

The raw counts are not affected by the userA setting. Multiplying the results by this factor (29.564nV) will give you the voltage across the sense resistor. Dividing by the sense resistor value will give you the current in A.

userA can be set to 0.1mA, 1mA, 10mA, or 100mA. So to convert to mA for example, you would multiply by 1000.

Best regards,

Matt

0 Dan Groswirth1 over 4 years ago in reply to Matt Sunna

Prodigy 190 points

Hi Matt:

Just to be sure:

I have 0.001 ohm sense resistor.

If I get raw adc count for charge current value as, for example, 1000000, and I mult it by 29.5nV I get 0.0295 volts.

for current value I must devide it by 0.001 ohm resistor value to get 29.5 amper...

Is that OK?

How cell # rwa current adc counts that |I get by 0071,72... and the 29.5nV are related as I dont have resistor value for the cell current meaurement to use in calculation...

What I dont understand?

Power management

Power management forum

BQ76952: Conversion the 24 bits ADC cell current data to userA data.