BQ76952: Current Measurement error over Temperature meaning and test condition

Emma Wang

Part Number: BQ76952

Hi expert,

My customer want to know the test condition of this waveform (Current Measurement error over Temperature)to calculate their sampled data.

The graph means the sampling error corresponding to the 4 voltage ranges at different temperatures, or the sampling error of 4 different sampling voltage ranges under the same voltage range at different temperatures.

Since the error is different, in my understanding, it is 4 voltage ranges? am I right?

besides, could you kindly give more details on test condition, such as current measurement units and shunt resistance?

Emma

over 2 years ago

0 Max Verboncoeur over 2 years ago

TI__Mastermind 25760 points

Hi Emma,

This graph is comparing the temperature drift error at 4 different input voltage ranges: SRP-SRN = 0-50mV, 50-100mV, 100-150mV, and 150-200mV. These values were calculated from the error specifications given in Section 7.15.

Regards,

Max Verboncoeur

0 Emma Wang over 2 years ago in reply to Max Verboncoeur

TI__Expert 5190 points

Max,

Thanks for your reply.

My customer want to do some calibration to eliminate the error caused by temperature.

they are confused at four waveform ranges, could you kindly send me the data you draw the waveform, for better supporting customer.

Emma

0 Arelis Guerrero over 2 years ago in reply to Emma Wang

TI__Expert 5645 points

Hi Emma,

In observance of the September 4 US Holiday, we will be out of office till September 5.

Regards,

Arelis G. Guerrero

0 Max Verboncoeur over 2 years ago in reply to Emma Wang

TI__Mastermind 25760 points

Hi Emma,

The image attached below provides the specifications of the coulomb counter. The graph was produced using these different contributors to the error. The purpose of the multiple ranges is to show off the fact that the gain error is more pronounced as the current increases. It's worth noting that the error in mA is usually larger at larger currents, but the percent error tends to improve.

Regards,

Max Verboncoeur

Power management

Power management forum

BQ76952: Current Measurement error over Temperature meaning and test condition