BQ76PL455A-Q1: VSENSE and AUX calibration

Vikram Jain

Part Number: BQ76PL455A-Q1

Hi All,

How do we calibrate the VSENSE and AUX measurement after scaling to incorporate the Gain and Offset error ?

I did go through sec 8.1.3.2 and 8.1.3.3 but hardly could understand anything.

can someone please help me learn this ? VSENSE 1 measures 3.662 using microcontroller and measures 3.6179 with BQ GUI. So there is a delta of ~50mV difference.

Kind Regards

Vikram Jain

over 7 years ago

0 Vikram Jain over 7 years ago

Intellectual 485 points

So if I am right VIN1 and VIN2 are the voltage measured from Accurate Multi meter and VOUT1 and VOUT2 are scaled voltage measured from BQ (raw adc values and sclaed in my code) ?

VIN1 3.653
VIN2 3.524
VOUT1 3.661
VOUT2 3.533
slope (m) 0.992248062
GEC 512
OEC -480

values i get are as follows so are they correct ? Please someone do reply.

0 Vikram Jain over 7 years ago in reply to Vikram Jain

Intellectual 485 points

Can someone please reply ? @ David Wiest Jr

0 David Wiest Jr over 7 years ago in reply to Vikram Jain

TI__Genius 11480 points

Hi Vikram,

I apologize for the delay in response, thank you for bumping it back up.

It seems like you do have the correct handle on things. Make sure you convert from Decimal to Hex, then drop the upper 8 bits, and take the two's complement of the lower 8 bits. This will be the value you write to the register.

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BQ76PL455A-Q1: VSENSE and AUX calibration