T-SIM7080G battery insertion issue (old batch vs. new batch)

[Peer77]

Hi Lewis,
hope you are doing OK.

Would be great if you could advise on the following, it is quite a big issue.

The situation: I have received a new batch of ESP32S3 with SIM7080G, which is now coming without the big diode next to the USB-C connector. So it makes it a bit easier to skip the removal and proceed right away with soldering the cable to the upper pad to feed 5V into it (as described in issue  #49) Very nice!

While testing the new batch against the old version (came with diode , and diode has been removed afterwards) I used the exact same repository for both batch versions, but got different results:

OLD BATCH:
    ⁃    inserting 18650 and have physical switch switched in direction of USB-C connector, the LilyGo remained switched off and only came to live when 5V was fed to the pad where the diode was located (as desired)
    ⁃    When 5V is removed, I used PMU.isVbusIn() to trigger a timer to switch off the Lilygo after 30s via calling PMU.shutdown(). This works very well.

NEW BATCH:
    ⁃    after having inserted the 18650, the Lilygo switches on right away (when switch is ON) despite the absence of 5V!
    ⁃    Also, after calling PMU.shutdown(), I can see that the powerlines for the modem are shutdown (as expected), but the VSYS voltage is not being shutdown(the connected LED remains lit)

I updated also the XPowerLib to latest version to check if this fixes the problem, but the issue remains.

Is there a fix for this issue to bring back the old behaviour (seen on old batch)? It is a significant change.

Thanks in advance, any advice is much appreciated.

Greetings, regards,
Peer

[lewisxhe]

Hi, Peer

1. The new version AXP2101 has changed the default configuration at the factory, and the default setting is to automatically start the machine when the battery is inserted.
2. In the new version, VSYS will not turn off the output when the machine is turned off, but will keep output
   In general, the new SIM7080G uses the newly configured AXP2101.