BQ40Z80: accuracy vs calibration

Vincenzo Pizzolante

Part Number: BQ40Z80
Other Parts Discussed in Thread: BQ-HI-PRODUCTION

hi,

1) What is accuracy of 7s cell measurement with and without calibration?

2) Which tool can be used to program the part in production (such as BQ-HI-PRODUCTION) with possibility of calibration of the IC?

thanks a lot in advance

Vincenzo

over 5 years ago

0 Andy Liu (BMS) over 5 years ago

TI__Guru 52115 points

Hi Vincenzo,

See the answers in the following threads.

a) https://e2e.ti.com/support/power-management/f/196/t/855198

b) https://e2e.ti.com/support/power-management/f/196/p/843649/3121431

c) https://e2e.ti.com/support/power-management/f/196/t/841862

Andy

0 Vincenzo Pizzolante over 5 years ago in reply to Andy Liu (BMS)

TI__Mastermind 25286 points

hi Andy,

thanks a lot for response.

Yes, this helps a bit, but regarding accuracy, there is only "best case", while we need to know, what is the worst case accuracy of 7s cell measurement, so we can take decision in advance if to prepare tester with calibration feature or not in order to start with mass production.

We should have some characterization data, feel fre to share with me in pvt

Vincenzo

0 Andy Liu (BMS) over 5 years ago in reply to Vincenzo Pizzolante

TI__Guru 52115 points

Hi Vincenzo,

I don't think we have the accuracy number for the worst case. Bascially, calibration is necessary to achieve good accuracy gauging performance. I would suggest your customer follow the app note below to do the calibration.

https://www.ti.com/lit/an/slua868/slua868.pdf

Andy

Power management

Power management forum

BQ40Z80: accuracy vs calibration