Hi,
We have a PCB with two AFE5818, both have the same electrical schematic configuration and share the same power supplies.
One of them is not responding to our SPI communication.
- All SPI signals are the same on both AFE’s
- I/O’s are configured correctly
- power supply ripple on all rails is <20mV
- No power drop was detected on all rails after configuration and Power Down pin release.
- Clock seems to behave the same on both AFE’s
- We tried connecting all AFE2 to AFE1 signals (except for their SDO)
- AFE1 SDO on power-up measure approx. 0.3v while the BAD AFE2 SDO is 1.8v
Attached plot screen shot and layout & schematics.
I would appreciate your help with this issue, or even a hint on what could make the 2nd AFE act the way it does (drops as the 1st is doing, and immediately release the line)
Best Regards,
Rotem
Edit: Design files removed as per customer request.