BQ25300: Regarding Thermistor Temperature Monitoring

Kyohei

Expert 1440 points

Part Number: BQ25300

Tool/software:

Hi team,

When using the device, please stop charging if the temperature is below 2°C and above 43°C.

What are the values of VT1 and VT3 when substituted into the following equations (1) and (2)?

In this case, should I use the values highlighted in the table below?

Best regards,

Kyohei

6 months ago

0 Ning T 5 months ago

TI__Guru 57481 points

Hi Kyohei,

For VT1%, may use typical 73.5%, For VT3%, may use typical 47.25%,

Thanks,

Ning

0 Yuta Nishie 5 months ago in reply to Ning T

Genius 4955 points

Hi Ning-san,

My name is Nishie and I work in the same team as Kyohei.

1. Regarding VT1%, please tell me the difference between the use cases of Typ 73.5% and Typ 71.5%.

2. Regarding VT3%, please tell me the difference between the use cases of Typ 47.25% and Typ 48.25%.

Best Regards,

Nishie

0 Ning T 5 months ago in reply to Yuta Nishie

TI__Guru 57481 points

Hi Nishie,

Each VTx% has rising and falling thresholds.

Thanks,

Ning

0 Kyohei 5 months ago in reply to Ning T

Expert 1440 points

Hi Ning-san,

Thank you for your reply,

Is it possible to use the BQ25300 with threshold values such as Thot: 43℃ and Tcold: 2℃, which do not add up to 45℃?

If possible, is there a calculation formula for thermistors with different characteristics than the 103AT-2, such as thermistor resistance values (18.3KΩ at 2℃ and 6.1KΩ at 43℃)?

Best regards,

Kyohei

0 Ning T 5 months ago in reply to Kyohei

TI__Guru 57481 points

Hi Kyohei,

For RT1 and RT2 calculation tool, please refer to http://www.ti.com/lit/zip/slurax7 for the BQ2589x calculator tool. Although it was developed for the BQ2589x, the principle is similar and can be used for BQ25300 with minor changes.

Thanks,

Ning.

0 Kyohei 5 months ago in reply to Ning T

Expert 1440 points

Hi Ning-san,

Thank you for your reply.

Is it correct to assume that it is possible to use the BQ25300 with thresholds such as Thot: 43°C and Tcold: 2°C, where the total does not reach 45°C?

Also, the calculation tool (http://www.ti.com/lit/zip/slurax7 for the BQ2589x calculator tool.) cannot be opened due to an error; should I contact customer support?

Best regards,

Kyohei

0 Ning T 5 months ago in reply to Kyohei

TI__Guru 57481 points

Hi Kyohei,

http://www.ti.com/lit/zip/slurax7

Maybe

Thanks,

Ning.

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BQ25300: Regarding Thermistor Temperature Monitoring