BQ25895: Inquiries about Thermistor

MJ Jeon

Genius 5240 points

Part Number: BQ25895
Other Parts Discussed in Thread: BQ25890

Hi,

I am constructing a circuit using BQ25895.

What does thermistor in the reference circuit do?

Can you give a brief explanation?

The temperature of the battery pack is being checked by receiving information from the battery pack.

Is it mandatory to use thermistor as in the schematic?

If it is a thermistor to sense the temperature of the IC itself, it should be used,

but if it is to sense the temperature of the battery pack, I don't think it is necessary.

Please confirm.

Thanks.

Regards,

over 4 years ago

0 Ning T over 4 years ago

TI__Guru 57861 points

MJ,

The device continuously monitors battery temperature by measuring the voltage between the TS pins and ground. Please refer to 8.2.7.5.1 Cold/Hot Temperature Window in Charge Mode for the details.

Thermistor is not a must-have.

Thanks,

Ning.

0 Ning T over 4 years ago in reply to Ning T

TI__Guru 57861 points

MJ,

Please visit https://e2e.ti.com/support/power-management/f/196/t/874557 for BQ2589X: Schematic Review and PCB Layout Design Tips and https://e2e.ti.com/support/power-management/f/196/t/875386 for BQ2589x/BQ25898x FAQs. BQ25895 is similar to BQ25890.

Thanks,

Ning.

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BQ25895: Inquiries about Thermistor