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DM355 PLL issue

gunjantalsania
Prodigy 115 points

We are using TI DM355 chip in our one of the project. By mistake we had given 3.3 V supply to PLL1 module of the chip instead of 1.3V. We are not able to connect DM355 to CCS.
 
Our query is Does DM355 chip has inbuilt Clamping module to overcome this over power issue ? Or will it get damaged due to this issue ? Do we need to replace the chip ?
 
Can you please help us solving this issue.

  • 0
    TI__Mastermind 41665 points

    gunjantalsania said:
    Our query is Does DM355 chip has inbuilt Clamping module to overcome this over power issue ? Or will it get damaged due to this issue ? Do we need to replace the chip ?

    The DM355 does have current clamping however there is no guarantee of protection, in particular if a 1.3v supply like the PLL voltage exceeds 1.7v as shown in table 4.1 of the datasheet than there is the potential for permanent damage meaning you may need to replace the chip. I am not sure how likely it is that the PLL was permanently damaged by the 3.3v operation, we do not test parameters beyond the maximum ratings. This is something you would have to test out, if the board that had the pll exposed to 3.3v will not work properly but an updated board that only ever had 1.3v on the PLL does work than you are probably looking at a need to replace the device.