BQ27426: Temp accuracy spec range for internal temperature sensor

Beginner

Part Number: BQ27426

As title, I think Fig4 in DS is used to explain the accuracy for internal temperature sensor.

My questions are

1. Based on this figure, the best accuracy is at ~10degC. But normally, it should be at 25degC normal temp. Thus I would like to double confirm if this figure is true.

2. If we perform a temp calibration at 25degC, does it means the curve will be corrected. In the other hand, 0% is at 25degC and the curve is shift to higher and until 25degC is 0% error.

over 5 years ago

0 Wyatt Keller over 5 years ago

TI__Guru** 105590 points

Hello,

The Datasheet should be correct: the lowest error is at -10degC. I will double check though.

The error at each temperature reading would be based on your calibration temperature, this could compound the error from the current temperature and your calibration temperature error.

Sincerely,

Wyatt Keller

0 Beginner over 5 years ago in reply to Wyatt Keller

TI__Intellectual 2381 points

Hello,

1. Please help to confirm this figure#4 is correct.

2. Seems like I didn't get answer for question#2.

Assume temp error @ 25degC is 5% and temp error @ 0degC is -1%. After perform a calibrate process at 0 degC, supposedly the temp error will be 0%.

Does it mean temp error@25degC will be 5+ 1 = 6%?

0 Kang Kang over 5 years ago in reply to Beginner

TI__Mastermind 24870 points

Hello Beginner,

1. Figure 4 was measured on a bq27426 EVM. Do you have any specific measurement issues you are seeing on the bq27426?

2. No, we would really need to measure the temperature on a per board or per IC basis.

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BQ27426: Temp accuracy spec range for internal temperature sensor