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DLP2021-Q1: Temperature-sense diode (Diode-connected transistor) accuracy

Soumya Gutti
Prodigy 60 points
Part Number: DLP2021-Q1
Other Parts Discussed in Thread: TMP411-Q1, TMP411, DLP3021-Q1

We are going to integrate "TMP411-Q1"(Temperature sensor) with the "DLP2021-Q1". I need below details
1) What is the n-factor for the Diode-connected transistor used inside DLP2021-Q1?
(This is required to calculate the temperature error)
2) What is the temperature accuracy of the Diode-connected transistor in DLP2021-Q1?
Should we calculate accuracy using n-factor as mentioned in the "TMP411-Q1" datasheet or is there any default value?

  • +1
    TI__Expert 8500 points

    Hello User,

    For these two questions, the TMP411 N-factor reset value is 3 according to the FPGA Programmer's Guide for the DLP3021-Q1 and DLP2021-Q1. 

    Please note, only the FPGA firmware for the DLP3021-Q1 supports the temperature sensor measurement. For the DLP2021-Q1 the temperature sensor measurement of the TMP411 must be offloaded to an external MCU because the FPGA firmware does not support this feature.

    If you are using the AM263x solution for the DLP2021-Q1, then the temperature sensor measurement function has not yet been implemented. 

    Regards,

    Lori 

  • 0 in reply to Lori Wang
    Prodigy 60 points

    Hi Lori,

    Thanks for the n-factor input.

    But we are going to use AM263x (AM2632COKFHMZCZRQ1) for DLP2021-Q1 and also "TMP411-Q1". 

    Could you please share the timeline when the Temperature Measurement function will be implemented?

    Regards

    Soumya

  • +1 in reply to Soumya Gutti
    TI__Expert 8500 points

    Hi Soumya,

    You can use TMP411-Q1 to be implemented independent of the DMD driver on the AM263x solution. You will need to develop the temperature measurement function by your own based on the TMP411-Q1 datasheet. 

    My previous information about the N-factor is based on the FPGA firmware, not for the AM26xx. 

    We will include a temperature sensor on the next-gen AM26xx EVM, but we don't have a timeline to be shared yet. 

    Regards,

    Lori  

  • 0 in reply to Lori Wang
    Prodigy 60 points

    Hi Lori,

    Thanks for the information.

    Regards

    Soumya

  • 0 in reply to Soumya Gutti
    TI__Expert 8500 points

    You're welcome!

    Regards,

    Lori