With BQ20z95EVM-001 we are trying to create Golden Image file for a older Batterypack. The Battery pack is taken out from a laptop. When we tried to do cycling, we couldn't create the Golden Image file for this battery pack. The updatestatus in the DataFlash is not gettting increased from 04 to 06. What could be the problem. The design capacity of the battery pack is 5200mAh. But the Full Charge Capacity calculated by the bq20z95 is around 2000mAh.
Is this Full charge capacity is accuarate. If it is accurate how much accurate it is when Max Error is 5%. Do we have to change design capacity of the battery pack to this Full Cahrge Capacity value so that we can create the Golden Image file.
It sound like the gauge has been damaged, then. This can happen if the gauge loses power while updating a DFI or SENC file.
As for chemistry updating, this should have been done before creating your golden image. The correct chemistry is critical for obtaining a good learning cycle. This can be done in bqEasy.
If the device is not communicating, then you won't be able to update the firmware. You should try another board out.
What is .ENCR file? Does it contain only Default Dataflash? or does it have default chemistry file included in it.?
What default files are flashed into the new EVM before it is shipped?
Is there a default chemistry file flashed into the EVM when it is shipped?
Please clarify my doubts
Is it possible to replace only the IC bq20z95DBT on the board?
If we replace the IC, will it work? As we can get this IC and replace it on the board. Is it a good idea?
Will gauge work properly? Do we need any additional flashing of files before we replace the IC?
Thanks & Regards,
Yes, you can change out the IC as well. You will need to rewrite your golden file to the new IC after replacing it, though. The new IC will come with default firmware.
An ENCR file is just default data flash with ID 100. ID 100 is the default chemistry that comes on all ICs.
What happens when any of the permanent flag is raised leading to permanent failure of the FETs. Can't they be fixed by writing PF key in a sealed gauge.
As once the gauge is sealed we do not have access to all commands. So this means, some how once the FET failure flag is raised the Smart battery is useless..
In the EVM once the learnign cycling is over and golden image is created with max error 1%. If we use this golden file in the production line flashing in all battery packs and install in system. Will the gauging continue to work with 1% accuracy?
Thanks & regards
Permanent failures are generally used to disable a pack permanently. They are usually configured to blow a fuse. It is possible in data flash to disable the fuse blow action for any of the permanent failures if you don't want to blow the fuse. However, the FETs will still be turned off and can only be turned back on again by sending the PF Keys to the gauge. The gauge needs to be unsealed in order to do this. There is no way to do it when the device is sealed.
The gauge will continue to work with 1% accuracy, but generally this is only at room temperature and with a similar load that you used during learning. If conditions change, such as temperature or loading, you may see accuracy decrease some, but it should remain within 3% for most conditions.
Will TI provide us the DataFlah golden image file for the gasgauge IC bq20z75?
For that what specifications do you need.? We are thinking to use moli ICR18650j battery pack in our product. Can you provide us the final golden image file which we can flash into the gasgauges in our production line.
If you can provide us the golden image file and we flash it into the gauge.. will it work with the accuracy of 1% ...?
Do you need our load characteristics as well ..to provide us DataFlash golden image file..
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