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Lite FET-Pro430 Elprotronic Flash FAIL

takeshi matsuzaki
Expert 2030 points
Other Parts Discussed in Thread: MSP430FR5739

Hello,

My customer has problem with flashing FRAM in MSP430FR5739 by Lite FET-Pro430 Elprotronic.
MSP430FR5739 is on customboard, the Fail occurs on some board (not all).

Details of operation is following.

It seems like it fails at "ERASE FLASH" and "BLANK CHECK".
But when doing "ERASE FLASH" after Fail, it goes well.

And do the "AUTO PROG" after "ERASE FLASH", it goes well too.

After some trials, my customer found 3 good ways.
1) "AUTO PROG" without "BLANK CHECK", this works fine.
2) "AUTO PROG" after "ERASE FLASH", this works fine too.
3) Only do "WRITE FLASH", this works fine too.

And the device(MSP430FR5739) which has been flashed well once, it would be flashed wuthout no Fails after that.

Do you know what the cause is ?

Regards,
Takeshi Matsuzaki

  • 0
    Guru 74080 points
    Hi Takeshi!

    I remember a similar case that was caused by a faulty supply connection between the FET and the target. This does not need to be the same here, but I would check proper connections first, just to be sure. Back then, the Vcc line did not have contact and it looked like during a few tries to access the device the capacitors on the target board got charged via the protection diodes of the MSP, finally having enough energy to establish a connection for a short time.

    Dennis
  • 0
    Guru 34483 points

    One plus for FRAM over Flash devices is that there is no need to "erase" it (write 0FFFFh to all location) before write. I will never understood people for "erasing" FRAM.

    Blank checking is another option (for flash devices) that is (for my point of view) irrelevant, because it doesn't guaranty that flash write after successful blank checking will be successful. Marginal read should be used for this. 

  • 0 in reply to Dennis Eichmann
    Expert 2030 points

    Hi Dennis,

    Thanks for givin' your good experience and suggestion.
    VCC on his bord may not eough as you said.

    Thanks!
    Takeshi Matsuzaki

  • 0 in reply to zrno soli
    Expert 2030 points
    Hi zrno,

    I'm so greatful such two big men mind this issue.
    Yes, eraing FRAM may be useless, because it is only write FFFFh like SRAM.

    Thanks!
    Takeshi Matsuzaki

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