Hi,
We have one more issue with the TPS65910A31 start-up.
Same issue as we mentioned in the below E2E with a different customer.
https://e2e.ti.com/support/power_management/pmu/f/200/t/501127
Few of the custom boards(AM335x+TPS65910A3A1) don't power up...
The VRTC voltage is very low in between 0V and 0.8V.
Same as the above E2E the problem is related to the capacitor value on VRTC pin,
if we change capacitor value on VRTC pin to 0.1uF all the boards were working perfectly fine.
The Boards are working with 0.1uF on VRTC
but we are not sure if this is a proper workaround?
Because as per the TPSxx datasheet, the capacitor value for VTRC should be in the range of 0.8uF to 2.64uF.
Note:
This application don't use Back-up mode or any sort of Low power mode,
the application will be ON always once powered up. AM335x is used in RTC feature disabled mode.
This issued has occurred with many of our customers using TPS65910
and we believe there is some problem in the TPS65910's VRTC during power-up.
Is this some kind of Errata or limitation of this device?
You can also find the details of same issue in the below E2E post also.
https://e2e.ti.com/support/arm/sitara_arm/f/791/t/320847
Confirmation:
Please let us know if it is OK to use 0.1uF on VRTC instead of 2.2uF(TYP)?
It will be helpful for many customers if there is mention on this issue in the manual or wiki page.
Best Regards
Kummi