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AM4382: AM4382CZDNA30S

Pankaj Kanthaliya
Prodigy 65 points
Part Number: AM4382


Hi,

This is Pankaj from eInfochips India and I am currently working on AM4382CZDNA30S Processor Based Project which is used for EPOS application and we are using TPS65218D0RSLR PMIC with the AM4382CZDNA30S Processor and my system is battery (3.7V@2500maH) as well as 5V External DC supply operated and we have IRIS, RGB Camera, wifi, BLE Barcode scanner and Finger Print sensor Interface on Board and now we are facing two major issues as:

1.Board Reboot Issue over Battery: As in this issue when we are discharging battery over the use case: IR LEDs, IRIS camera, WIFI, Display continuous ON then after some time my board gets reboot and this shall occurs very randomly like during discharging sometimes it came on battery drained at 50 percent and sometimes it came on battery drained 30 percent.

2.Processor Damage Issue: We have observed in three boards as VDD_CORE_1.1V core supply and VDDSHV_3V3 of processor gets short with ground. In this case we try to find all possible reasons but we didn't got any technical reason due to that the board get damaged so could you let us more about this processor sensitivity as is very sensitive towards ESD or required any other special care instructions or is there any such related problems with this processor earlier.


Regards,
Pankaj Kanthaliya

  • 0
    TI__Guru* 86180 points

    Pankaj,

    1.  Most likely you are reaching some voltage threshold in the PMIC, which is causing a reset to the processor.  Can you determine the cause of the reset?  Is the reset from the PMIC toggling to cause the reboot?  Or is it some internal reset in the processor?  You can check the reset reason in the RM_WKUP_RSTST register

    2. There could be many reasons for this, including issues with board assembly, device handling, or board design issues.  Did the short occur immediately when applying power to a new board, or did the short occur after operating the board for some time?  If it is only happening on a few boards, you could have an assembly issue.  Has the board been x-rayed for any shorts?  Double check the power sequencing requirements are met.  Also, ensure none of the pins of the AM438x are powered before the device is powered.  You should have a full power tree for the board to ensure all supplies are sequenced properly, especially ones that are not controlled by the PMIC.  If you have provisions to measure current on each power rail, ensure there is no excessive current draw. 

    You will have to narrow down these issues before you can get a good handle on what is causing them.

    Regards,

    James