My customer use TPS25750 on their project. In their production line test pattern, they will read the BOOT_STATUS register to check the if PatchConfigSource is 5h, and I2cEepromPresent is 1h confirm the TPS25750 work with EEPROM well. The normal good board would show value 5h for PatchConfigSource and 1h for I2cEepromPresent; however in their recent second source verification build of other circuit on the same board, they find the register show PatchConfigSource 7h, I2cEepromPresent 0h. Both two boards could output 9V voltage which is exactly what they configured the part. Full read back register as below:
OK PCBA 10100010111100100000000000011100 (A2F2001C) byte4-1
NG PCBA 11100010111100100000000000000100 (E2F20004) byte4-1
Get following questions:
- PatchConfigSource 7h show reserved mean, what does this exactly mean?
- Does it possible to get 9V output while TPS25750 report no EEPROM? What may cause this issue?
- Any suggestion for further test?
Could you help share comments on this?