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AWR2E44PEVM: How to eFUSE?

Lina Kim
Prodigy 590 points
Part Number: AWR2E44PEVM
Other Parts Discussed in Thread: AWR2944

Tool/software:

Hi team,

When customer check TI EVM schematic, TPS78417QDBVRQ1 using for efuse.

It doesn't matter if they don't use that part in the development stage, but I think it will be necessary during production.

When I check the AWR2944 Datasheet, 1.7V is needed to write the key once before production, but it seems that the method is not suitable for the field board.

Can you explain how to  efuse? Are you have any jig board regarding this?

 

Regards,

Lina

  • 0
    TI__Mastermind 30215 points

    Hello,

    Yes, 1.7V should also be used in production. There are a few criteria which should be met for the VPP supply.

    1. VPP voltage should only be applied after all other supplies are up and stable. VPP must be ramped up at the end.

    2. VPP should only be connected during the fusing process. Once this is complete, VPP should be removed. As in the EVM design, you can use a jumper to accomplish this. Or, you can use a probe in production (leave an exposed test point for VPP and test probe will contact this test point and supply 1.7V during key writing process).

    3. VPP noise and transients should be kept to a minimum. Regulator must be able to handle 50mA load without any transients occurring on the supply. Any fluctuations in the voltage on this supply during the writing process can cause errors/failures.

    Regards,

    Adrian

  • 0 in reply to aozer
    TI__Prodigy 590 points

    Hello Adrian,

    Then, is it normal to prepare 1.7V supply on the field board? For that one time?

    Regards,

    Lina

  • +1 in reply to Lina Kim
    TI__Mastermind 30215 points

    Hello,

    Sorry for the delay.

    Yes, 1.7V needs to be provided to the board during fusing. Once completed, the 1.7V supply should be disabled.

    Regards,

    Adrian