bq20z65EVM Terminate Discharge

Markus Zaunschirm

Hi there,

Is it possible to automatically stop the gas gauge from discharging the battery? And which parameter needs to be set?

I want the gas gauge to terminate discharging (switch off the DFET) if the overall pack voltage is at 14400mV. I set the Term Voltage to 14400mV. But when running a learning circle the window displays : Discharge to 13200mV. However, I need the gauge to terminate charging at a cell voltage of 3600mV. I can set the CUV in the 1st level safety to 3500mV. Would it least stop discharging if one of the cells is at 3500mV or a bit less? Why is the DFET not turned of when a TDA is set, or at least when the remaining capacity is 0%?

Thanks for your help,

Markus

over 12 years ago

0 Onyx Ahiakwo over 12 years ago

TI__Guru* 76230 points

Markus

yes, The fets turn off if the CUV threshold is reached which in your case is 3500mV. The terminate discharge alarm or the rem cap has no control over the fets.

thanks

Onyx

0 Markus Zaunschirm over 12 years ago in reply to Onyx Ahiakwo

Prodigy 120 points

Hi Onyx,

so this means that the TermVoltage in the IT Config register has no effect on the DFET and is just used for the remainig capacity claculation?

Thanks,

Markus

0 Onyx Ahiakwo over 12 years ago in reply to Markus Zaunschirm

TI__Guru* 76230 points

Hi Markus,

That's correct. The term voltage is used by IT for capacity calculation and has no effect on the DFET.

thanks

Onyx

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bq20z65EVM Terminate Discharge