No calibration in Mass production of bq27541 & bq20z75

1) Do i need any other modification for the bq27541?

For calibration no. You just need to average each of the parameters in the calibration section of df

2) Can i cancel to calibrate each board individually in M.P. is there any risk?

The trade off of averaging the values is reduced measurement accuracy. We have customers that average and that has worked ok for them. We recommend checking to see that the measurement accuracy works for you after doing the average.

3) How to calculate the calibration values by myself? 

you do not calculate the calibration parameters your self. the gauge performs the calibration routines when you click the calibrate button on bqstudio 

 4)   Is there any document which shows the calibration process?

refer to the user guides of the devices. They describe the calibration process.

thanks

Onyx

Hi, Onyx

I want to know the main factor which cause the accuracy?
IC itself, resisters, or PCB?

Take the temperature for instance.
To bq27541, IC connects one external NTC resister. Is the NTC resister variation which causes the temperature variation? or PCB, IC itself?
Can you show me the calculation method, circuit architecture? It can help me to understand.

Thanks
J.C Chen

There is no way to quantify the variation given different customers will have different boards and there may be variations in the different components that make up the board.. The burden rests on you to test between if using the averaged values the accuracy meets you specs or calibrating each unit

Onyx

error in accuracy measurement is a usually a combination of the different factors you mentioned. Your best bet will be to run tests to make the decision between calibrating each board or using the averaged calibration parameters . Customers who use the averaged have seen pretty good results .

-Onyx