Hi,
I have some questions regarding the bq500412 EVM. I recently made a proto PCB referring to bq500412EVM.
But proto pcb is not working normally . proto pcb has some problems.
I attached the image files regarding following problems.
First problem,
Snooze signal of proto pcb is always active (3.3V). but Snooze of bq500412EVM is approximately 700 ms pulse signal.
When these conditions appear?
Yellow is EVM pulse wave and Green is proto active wave.
Second problem,
Once I removed the Q7 and I made the EN work Forcibly. Vcc is working well.
DPWM signal of proto pcb is different from the DPWM signal of EVM.
DPWM of EVM is single-pulse bursts approximately every 500 ms.
But DPWM of proto pcb have a different pulse wave form and approximately 2s period.
what is this problem?
Yellow is EVM wave and Green is proto wave.
Finally, I attached image regarding V_SENSE and I_SENSE.
Yellow is V_SENSE of EVM and Green is V_SENSE of proto.
Yellow is I_SENSE of EVM and Green is I_SENSE of proto.
I want to know why proto pcb don't working normally.
Making me know how to fix this issues would be appreciated.
Thanks.
Best Regards.