Hi all,
I have been have a strange fault occurring with the DP8570 device. I have roughly 20 board in which this device has been used on and they all fail at the same point all at high temperature. Out of the 20 faults 13 are from one batch and 7 are off another. The weird thing is that when you spray it with the freezer spray it works!
in more detail it follows these stages during a test in which it fails.
1. The initial WRITEn's switch between page 0 and page 1 and the data is read and saved to RAM
2. The test then begins and READ and WRITEn data which overwrites the current data on both pages.
3. The next step READ's the data is correct on both pages.
4. Finally the data from the RAM is restored.
The fault always occurs at stage 3 where the data is read off both pages but fails at the end of the page 0 read. I have connected the device to a logic analyzer only to find that the fault happens on the MSB of the data bus. It doesn't seem to read the test data that was inputted successfully in stage 2
Could this be faulty batches or is there something else going on here?
Thanks!