BQ76952: bq76952

Hello Mohit,

You are able to use different sense resistor values through adjusting CC Gain and Capacity Gain, but please consider protection threshold needs in this process. 

Current, resistor, and protection threshold considerations: Table 16-1. BQ76952 Design Requirements and The Sense Resistor Selection excerpt under Section 16.2.2 Detailed Design Procedure in the BQ769x2 datasheet (BQ76952 3-Series to 16-Series High Accuracy Battery Monitor and Protector for Li-Ion, Li-Polymer, and LiFePO4 Battery Packs datasheet (Rev. B) (ti.com)). 

Calibrating CC gain and Capacity gain: Section 10.10 Current Calibration in the BQ769x2 datasheet and Section 2.6 Current Calibration in the Calibration and OTP Programming Guide (BQ769x2 Calibration and OTP Programming Guide (Rev. A)).

Current accuracy information: CURRENTly questioning the accuracy of your battery monitor? technical article (+) CURRENTly questioning the accuracy of your battery monitor? Improve battery safety and accuracy with these tips - Power management - Technical articles - TI E2E support forums

I hope this helps!

Best,

Andria

Hello Andria 

Thank you for replying. 

I have checked the shunt resistor value but that was the maximum value which we can take minimum value is user dependent based on the design.

Is there any supporting material from which we have a step by step process for the current calibration.

In technical sheet and otp datasheet it is quite  confusing.

If any supporting material will be there then please share with us.

Thank & Regards

Mohit Aggarwal

Hi Mohit,

I am sorry to hear that you are having difficulty understanding the data sheet and OTP programming guides.  I do not know if you saw the last resource I linked, but this offers a more in-depth explanation: Current accuracy information: CURRENTly questioning the accuracy of your battery monitor? technical article (+) CURRENTly questioning the accuracy of your battery monitor? Improve battery safety and accuracy with these tips - Power management - Technical articles - TI E2E support forums.  

Additionally, the OTP programming guide offers a step-by-step guide on calibration for your precise application. Please refer to section 2.6 for the step-by-step and section 2.9 for applicable code. Unfortunately, I cannot offer a more step-by-step approach than these guides, as they offer the most clear and concise explanation possible.

Best,

Andria