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MSP430F5340: Regarding MSP430 failure on EFT/Burst

Part Number: MSP430F5340
Other Parts Discussed in Thread: MSP430FR5994

I am using MSP430F5340 in my design and the only I/Os used are that of ADCs and UART and the rest of the I/O lines are grounded. I tested the design on EFT/Burst and observed that if I used the internal DCO at 8Mhz as my clock (no external crystal used, crystal pins grounded) the MSP doesn’t malfunction even with 4KV pulse. If I used an external crystal of 16MHz with series resistances of 22ohm and capacitors of 33pF(crystal ABM3-16.000MHZ-D2Y-T), the MSP hangs completely 0.5KV pulse. I am confused as to why external crustal result into such a failure in EFT testing? What points I need to check in lsyout or otherwise.

  1. During test I unknowingly didn't change the XT2DRIVE bits from 0 to 1 while changing from a 8MHz crystal to 16Mhz crystal. Will that make any difference while doing EFT tests?

  2. When I referred MSP430FR5994 launchpad schematic it didn't show external capacitors. Should I use those? If I opted not to use those then is there any way to enable internal capacitors of the MSP. And if yes, of what values should I choose? And the launchpad design didn't show any series resistances also. Should I use those as well or not?

  3. And If I decided to use internal crystal /DCO at 8Mhz, will it be stable in the temperature range of -20 to +70 Degrees or at-least between 0 to 70 Degrees.   

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