BQ25883: Operation Temperature Control on Battery Discharging

Pierson Wang

Part Number: BQ25883

Hi,

When I checking the BQ25883's datasheet, I found the VBCOLD and VHOT only support in OTG mode. If I disable the OTG function, would this features still works in normal case.

For example, the battery discharging temperature is 0C to 60C, does there has any temperature related register could control?

over 4 years ago

0 Wyatt Keller over 4 years ago

TI__Guru** 105590 points

Hello Pierson,

The temperature thresholds are different for OTG and normal boost mode. The boost mode temperature range can be configured by changing the RT1 and RT2 resistors. You can adjust how much charge current and the charge voltage in register 0x08, but the percentages of REGN are preset and can't be changed like the BCOLD and BHOT parameters since it follows the JEITA percentages.

Sincerely,

Wyatt Keller

0 Pierson Wang over 4 years ago in reply to Wyatt Keller

Prodigy 20 points

Hi Wyatt,

I think the boost mode only for charging, right? And JEITA also only works at charging? If I want to control the battery discharging (Without OTG function) related to temperature, does it means the only way is --- I read the TS_ADC register and use MCU to control the whole system operation?

0 Wyatt Keller over 4 years ago in reply to Pierson Wang

TI__Guru** 105590 points

Hello Pierson,

Yes that's correct. Yes if you want to control during discharging you would have to read the temperature data and then use the MCU to make any changes. We usually recommend the gauge does the temperature monitoring if there is a gauge in the system.

Sincerely,

Wyatt Keller

0 Pierson Wang over 4 years ago in reply to Wyatt Keller

Prodigy 20 points

I saw there has lot of pre-set TS percentage, does there any limitation on reading TS_ADC percentage range? Or we could read from 0% to 100%?

0 Wyatt Keller over 4 years ago in reply to Pierson Wang

TI__Guru** 105590 points

Hello Pierson,

The percentages are based on REGN, so this would really depend on your thermistor and resistor network. The range is 21% to 80% of REGN that is reported by register 0x10.

Sincerely,

Wyatt Keller

0 Pierson Wang over 4 years ago in reply to Wyatt Keller

Prodigy 20 points

Hi Wyatt,

Looks like "21% to 80% o REGN" is not mentioned in the datasheet. In the datasheet, I only found the range is 0% to 94.9% on the 0x21 register description, would you mind clarifying more?

+1 Wyatt Keller over 4 years ago in reply to Pierson Wang

TI__Guru** 105590 points

Hello Pierson,

You are correct, this charger is 0% to 94.9% range. I had looked at the wrong reference.

Sincerely,

Wyatt Keller

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BQ25883: Operation Temperature Control on Battery Discharging