BQ25672: Application issues

Reed

Expert 2300 points

Part Number: BQ25672
Other Parts Discussed in Thread: , BQSTUDIO, BQ25798

HI,

Can BQ25672 solidify some setting parameters inside?

over 2 years ago

0 Md Munir Hasan over 2 years ago

TI__Expert 3335 points

Hi Reed,

Our experts are on holiday break. They will respond to you when they return.

Best Regards.

0 Jeff F over 2 years ago in reply to Md Munir Hasan

TI__Guru**** 180186 points

Hi Reed,

By solidify, do you mean have the charger retain those settings after power is removed? If so, the answer is no. The register settings return to default values if the watchdog timer expires or if VBUS and BAT pin voltages drop before their respective UVLO voltages.

Regards,

Jeff

0 Reed over 2 years ago in reply to Jeff F

Expert 2300 points

Jeff, thank you for your feedback.

There are other issues as follows:

1. If the battery is not connected and the input is powered normally, and the CE PIN is pulled low, what is the voltage of VSYS at this time?

2. Resistance setting for charging temperature range, Is there a table for calculating resistance values based on battery NTC parameters?

3. the datasheet 8.3.6, How to understand this:

No battery or battery removed while charge enabled and TS pin function is disabled -

4. Do you have any relevant SDKs or software examples?

0 Jeff F over 2 years ago in reply to Reed

TI__Guru**** 180186 points

Hi Reed,

Regarding 1, SYS voltage pulses between BATREG setting and MINSYS setting as the BAT capacitors charge, terminate, recharge, repeat, assuming no TS fault due to missing thermistor.

Regarding 2, there is no table but attached is an excel spreadsheet that should help.3718.BQ2579X_TS_Calc.xlsx

Regarding 3, see my response to 1 above. With no battery, no TS fault and charge enabled, SYS and BAT pulse.

Regarding 4, linux driver for the family is at the link below. The driver simply helps with I2C register reads and writes.

https://git.ti.com/gitweb?p=ti-analog-linux-kernel/dmurphy-analog.git;a=commit;h=75997c21e9dfc0d54b7f774bfb37e6af796ff293

Regards,

Jeff

0 Shen weiping over 2 years ago in reply to Jeff F

Prodigy 70 points

Because the device is powered by DC 12V adapter, there is no use of USB d+d-. Please tell me how to deal with the d+d- pin without USB, and then how to deal with the useless QON pin,such as hanging?

Is there any other temperature rise data for BQ25672?

0 Jeff F over 2 years ago in reply to Shen weiping

TI__Guru**** 180186 points

Hi Shen,

Please refer to

https://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/1309080/bq25672-bq25672-application-parameter/4973635#4973635

Regards,

Jeff

0 Shen weiping over 2 years ago in reply to Jeff F

Prodigy 70 points

Jeff, thank you for your feedback.

Regarding 1, If the battery is not connected and the input is powered normally, and the CE PIN is pulled low but TS pin function is not disabled，Will it be the same as your response?

0 Shen weiping over 2 years ago in reply to Shen weiping

Prodigy 70 points

There are other issues as follows:

2.VBAT_UVLOZ set so low 2.4V or 2.6V, 2S battery conditions, what else will be useful?When will it be used?

0 Jeff F over 2 years ago in reply to Shen weiping

TI__Guru**** 180186 points

Hi Shen,

If no battery, power applied, /CE=low and TS fault due to missing thermistor (i.e. TS not disabled), V(SYS) does not pulse.

Regarding VBAT_UVLO reports undervoltage lockout, meaning when the IC doesn't have high enough voltage for I2C to function and SDRV to turn on the shipFET if used in battery only mode (no input power).

Regards,

Jeff

0 Shen weiping over 2 years ago in reply to Jeff F

Prodigy 70 points

Hi Jeff,

BQ25672EVM configuration file for BQSTUDIO does not appear in the
Charger, download the .BQZ file from the EVM product folder-----No, where can I download it?

0 Jeff F over 2 years ago in reply to Shen weiping

TI__Guru**** 180186 points

Hi Shen,

You can use BQ25798 BQZ file for BQ25672. The BQZ file shows up to 5A charge current but BQ25672 is limited to 3A. Also, BQ25672 does not have backup mode like BQ25798.

Regards,

Jeff

0 Shen weiping over 2 years ago in reply to Jeff F

Prodigy 70 points

Hi Jeff,

...BQ25798 BQZ file for BQSTUDIO does not appear in the
Charger?

0 Shen weiping over 2 years ago in reply to Jeff F

Prodigy 70 points

Hi,Jeff,

BQ25672, When the input current reaches ILIM(IINDPM) and VBAT is much lower than VSYSMIN, what is the VSYS voltage?

0 Jeff F over 2 years ago in reply to Shen weiping

TI__Guru**** 180186 points

Hi Shen,

In IINDPM, V(SYS) = V(BAT) because the BATFET turns on full to support the load on SYS.

Regards,

Jeff

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BQ25672: Application issues