TMS320F28069: internal temperature sensor accuracy / calibration constants

Part Number: TMS320F28069

Hi all

My customer wants to use the internal temperature sensor of the TMS320F28069 as a 2nd source for temperature measurements and they have this question about accuracy:

In this post it is stated that accuracy is only +/-20°C

https://e2e.ti.com/support/microcontrollers/c2000/f/171/t/157574?TMS320F28069-F28069-F2806x-F2806-Internal-Temperature-Sensor-Accuracy

Does this already consider the internally stored calibration constants as outlined in SPRUH18H page 555 ?

www.ti.com/.../spruh18h.pdf

Best regards

Ueli

over 5 years ago

0 MatthewPate over 5 years ago

TI__Guru* 81820 points

Ueli,

Yes, this note comprehends the calibrated values stored on the device.

However, in this scenario as a backup to the primary temp sensor, I think there could still be good value here. If possible the customer could take some data with both the external and internal temp sensors and store the digital ADC conversion of the temp sensor as a reference and store it to OTP or flash. As the system ages they could periodically check for some continuity between the two over time.

If the internal temp sensor is meant to be a kind of failsafe backup, then we would have to comprehend the error mentioned in the DS. Its also worth noting that the measurement is at the junction level of the F2806x so it may be somewhat higher than an ambient reading by the internal temp sensor due to self heating.

Best,

Matthew

0 Ue over 5 years ago in reply to MatthewPate

TI__Genius 17255 points

Matthew

Thank you for the quick reply / the clarification.

Best regards

Ueli

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TMS320F28069: internal temperature sensor accuracy / calibration constants