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DM6446 0.8V on 1.8V power pad

Eason Wang
Genius 13460 points

Hi 

My customer meet an issue about power/reset before mass production:

Customer find that 1.2V power will cause 1.8V pad have 0.8V measured , even 1.8V power is not on.  This will cause reset failure issue because the reset signal is tighted to 1.8V supply(Because there will be 0.8V before 1.8V is on, the RC reset circuit will go High much faster than designed)

Is there similar things been observed? Will it be harmful to the device?

I have got below work around for customer, they haven't decide to accept or not:

1. Use 2 resisters to get 1.8v from 3.3v pwr , so their will not be 0.8V issue. (Tested and passed)

2. Use larger value C in RC circuit, so the reset release time will be much longer. (Haven't tested yet)

Any suggestions?

Thanks & Best Regards,

Eason Wang

 

  • 0
    TI__Genius 13460 points

    Hi, My customer has fixed the reset issue, but they wander if the 0.8V voltage is harmful to the chip.

    Is there any idea to find out why there is the 0.8V on 1.8V pad?  I never heard of this and it should come from there design only.

    BR,

    Eason