BQ76952: Temperature and power consumption issues

Ethan Liu

Part Number: BQ76952
Other Parts Discussed in Thread: BQSTUDIO

Tool/software:

Hi team,

We used a BQ76952 chip, and we encountered two problems:
1: We collected the battery cell temperature through BQ76952 and found that the low temperature collection was inaccurate, and the 18k temperature model inside the chip was used.
2: When the chip enters deep sleep, the power consumption is more than 200 uA, which is inconsistent with the specification. Is there something wrong with it?

The above is a bit urgent, please respond urgently, thank you!

BR,

Ethan

4 days ago

0 Maxwell Verboncoeur 3 days ago

TI__Mastermind 20750 points

Hi,

Today (Nov. 29) is a U.S. holiday. The team will be back in office on Monday, and will get back to you then.

Thank you for your patience.

Regards,

Max Verboncoeur

0 Ethan Liu 1 day ago in reply to Maxwell Verboncoeur

TI__Intellectual 765 points

Hi Maxwell,

Hope to get your feedbacks soon, thanks

BR,

Ethan

0 Alexis_H 9 hours ago in reply to Ethan Liu

TI__Expert 6990 points

Hello Ethan,

Thank you for your patience.

1. Are the temperature measurements calibrated? If not, Section 2.7 Temperature Calibration in the BQ769x2 Calibration and OTP Programming Guide will be helpful. We also offer a thermistor coefficient calculator tool. Here is the link to the tool: Thermistor Coefficient Calculator. Here is a link to the FAQ in how to use it: BQ76952 Configuring Temperature Model FAQ.

2. 200uA is very large for when the chip is in deep sleep mode. This sounds like it could still be in NORMAL mode potentially. Can you double check if the part is in DEEPSLEEP mode or not by checking the status with BQStudio or reading the register? Section 6.1 0x00 Control Status() and 0x12 Battery Status() Commands in the BQ76952 Technical Reference Manual will tell you which register to read to know.

Best Regards,
Alexis

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BQ76952: Temperature and power consumption issues