Hi everyone, my team and I are developing a custom board for the compute module 4. We're having trouble just booting up. We've made sure only the 5v line has voltage in it before the boot up sequence. We're also using a lab power supply to test and made sure our compute module boots up on the evaluation board. Yet we see this pattern (attached file) when we start the board. Seems like there is a periodic dip on the 5.v (blue) and and spike on the 3.3v (yellow). The purple line is the global_en pin just after being released by an stm32 from being grounded, so is pulling itself up. Seems a bit slow, but we're not sure if that is the issue.
Has anyone seen this pattern and if so, were you able o fix it? Many thanks in advance !
Has anyone seen this pattern and if so, were you able o fix it? Many thanks in advance !
Statistics: Posted by aaronilai — Fri Nov 22, 2024 8:32 am — Replies 1 — Views 18