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TRF7960ATB Build Issue

John Zigrang
Intellectual 530 points

I just received two TRF7960ATB boards via DigiKey and both has the wrong Regulator on them.

They are designed to have the tps61222DCKT on them which is a fixed 5.0V boost.

But instead they had the tps61222DCKR which is adjustable.

I tried to work with Ti customer support on this and after a week and taking picture of the issue, they claim the board is correct.

Has anyone else had issues with the build of the board or EVM boards?

Did TI do anything about it?

Is there a better options for RFID then TI?

  • 0
    TI__Guru* 91206 points

    John - 

    you are correct - please let me know which distributor you ordered from and to whom you spoke with in the customer support area and i will ensure you get replacements. Sorry about that - it was a mixup at the subco which has been fixed some time back,

    my email is: josh.wyatt@ti.com

    sorry for your trouble here - and i am glad you reached out on the Forum. 

  • 0 in reply to Josh Wyatt
    Expert 1525 points

    Just as an FYI update, I received two TRF7960ATB boards 2-3 weeks ago from Digi-key and while I can't distinguish the markings on the IC well enough to know that the voltage booster is incorrect, I am not getting 5 V out of it. Instead I'm getting around 2.3 V, well outside the operating conditions for the TRF'.

    This is at least 8 months after this issue is known, and I saw no mention of this anywhere except here. Just lucky chance I saw these threads:

    http://e2e.ti.com/support/wireless_connectivity/f/667/t/321592.aspx
    http://e2e.ti.com/support/wireless_connectivity/f/667/t/329622.aspx

    Shouldn't someone either recall the boards or at least make a mention of it? As the chip is quirky (see the errata sloa140.pdf) this is not what you typically check on a brand-new dev board.

    Josh, I've emailed you directly, appreciate any help I can get from you.

  • 0 in reply to mslothy
    TI__Guru* 91206 points

    the sub-co and distribuiton was supposed to take care of all these - the issue is the population of the regulator. the sub-co installed TPS61222CKR instead of CKT. and the CKR is adjustable versus fixed output - so then the issue occurs. 

    you can still use them while we figure out how to make it right by you on this - just set up the part for operation at lower voltage - so make Chip Status Control register 0x20 or 0x30, instead of using 0x21 or 0x31.

    sorry for the delay - i will also reply to your email, too. 

  • 0 in reply to Josh Wyatt
    Expert 1525 points

    Thanks for the answer Josh,


    setting it to 0x20/0x30 sets the chip to work according to a 3V power supply, I read out 2.3V on Vin though. This is far below the specified operating conditions for the chip (>=2.7V) which most likely explains why the RF isn't working. Tricky, as the SPI and the chip was working as expected otherwise.


    Best,

    Marcus