Understand Battery parameters for BQ34EVM Software

PJE52465

Hi all

In my battery datasheet I have the 5,10 and 20Hr Capacity however in the EVM sofwtare unders configuration tab it askes for the Design Capacity in mAH ,

is this 20Hr rateing the Design capacity ( I would exepect so) which is 105 AH for my battery ,

secondly the parameter needs me to set the Design Capacity in mAH in my case then 105 000 mAH but this is not accepted by the Sofware ,the software reports

a max of 32000 mAH is allowed as Design Capacity parameter, In the Flash Configuration manual it mentions design capacity /5 is this the correct thing to do

this in my case 105/5 = 21 (21000 mAH).

Then the Full charge Capacity is that the same number as the Design Capacity I would expect so alo but not sure or clear on this

Any help greatly apprecated

over 13 years ago

0 ThomasCosby over 13 years ago

TI__Guru 73830 points

Peter,

Current, capacity, etc. are generally handled in mA, mAh, etc. So, your 105Ah pack will be 105000 mAh. The device registers can only support up to 32767 mAh, but the device offers X10 Mode. This mode can be invoked by setting the X10 bit in the Pack Configuration register. In X10 Mode, the units will be 10mAh instead of 1 mAh. Therefore, you would enter the 105000 mAh as 10500 cAh (centiAmpHours) in the register. Special current calibration is required when operating in X10 Mode. See the X10 Mode section of the datasheet.

Regards
Tom

0 PJE52465 over 13 years ago in reply to ThomasCosby

Intellectual 390 points

Tom

Thank you very much this clears the issue, I was faceing appreciate your time and efforts to help .

Regards

Peter

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Understand Battery parameters for BQ34EVM Software