Hi,
We have a CPU-board design based on the iMX7D Sabre evaluation board (MCIMX7D-SABRE). In recent light of some strange power-on / power-off behaviour with our board we have some questions about the purpose of U37 (TPS3808G30DBVT) in the Sabre Evaluation board. It would be very helpful for our debug effort if you could shed some light on how this specific part of the system is intended to work.
During a power-down (with sufficient capacitance attached on the PSU_5V0 rail) we have seen the following:
Best regards,
Erlend
Hello,
As I understand the following circuit is considered.
The mentioned circuit serves to meet general recommendation to remove power (voltage source)
for all components on the board in case of a processor reset. This avoids having to determine if a
component critical to rebooting the processor is in the necessary state to support a reboot.
So, total system POR may be recommended for reboot (via WDOG).
As for Your case, please check if VSNVS voltage is (always) provided.
Have a great day,
Yuri
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