The influence of Ibias

user4005424

Part Number: TMP61

Hi，

I plan to use Vias 3.3V and Rbias 18.4k to sample the temperature. Form datasheet, the resistance of TMP61 is different due to the change of Ibias. Now, I want to calculated the accuray of the sample temperature. So, could you tel me how much is difference between data in table 6 and my condition？

Thank you .

over 4 years ago

0 Jalen Tate89 over 4 years ago

TI__Genius 9675 points

Hi,

Allow me to double check with the team and get back with you.

Jalen

0 Jalen Tate89 over 4 years ago

TI__Genius 9675 points

Hi,

The information you stated is correct, using a 18.4k Rbias will result in a a different transfer table than what is pointed in the datasheet due to the change of Ibias. The transfer table in the data sheet references a Vbias of 2.5V.

We have not characterized the device at 3.3V Vbias with an 18.4k Rbias, but what I can provide is a 3.3V Vbias and 10kOhm polynomial equation for the transfer table of our device. You would need to change your Rbias to 10k for this to be most accurate, or characterize with 18.4kOhm Rbias on your own.

Jalen

0 user4005424 over 4 years ago in reply to Jalen Tate89

Prodigy 150 points

HI，

Please tell me the polynomial equation for 3.3V Vbias 10kohm Rbias， I will change to 10k and calculate.

Thank you.

0 Jalen Tate89 over 4 years ago in reply to user4005424

TI__Genius 9675 points

You can use the 4th order polynomial of 8479.87 + 55.48T + 0.1577T^2 - 2.849E-4 T^3 + 2.165E-6 T^4.

Jalen

Sensors

Sensors forum

The influence of Ibias