Part Number: DLPA3005
I have a platform that PMIC/LED driver is DLPA3005. We got a strange issue. The first time power up will be fail, then power off and wait within 3 second. The second time power will be sucessed. I had analysis the issue PCBA and find resetz signal go low when DLPA3005 initial. The Int signal of DLPA3005 is normal when resetz signal go low. we have no idea that why Resetz go low. Please help to check which point that i can test or debug ? .
we have 20 pcs PCBA in this pilot run and only 2 pcs PCBA has this symptom.
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I had do more debug today, i had measured SPI sign between DLPA3005 and DLPC3437. The waveform had indicated that DLPC3437 had communicated with DLPA3005 before resetz go low.
Does it cause by init file that about DLPA3005 setting?
In reply to Andrew Wallace1:
In reply to Huang Kenny1:
Sorry for the delay.
This looks like the second power up of the board may work due to some caps being charged up from the first attempt.
It may be good to look for negative glitches on VIN first and then check for a short low pulse on INTZ. The acquisition mode or time base may need to be changed to check for either issue.
It would also be good to probe the output voltages and the DMD voltages to see if they come up or not.
Normally, one or more 47uF caps should be placed on VIN close to the DLPA3005.
- If tantalums are used, please make sure they have low ESR.
- Ceramics can be used to give equivalent capacitance.
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