M5Stack Gray reboots when USBC power removed

[Barky919]

Hi all, I have purchased 4 units of M5 Stack, those gray color with MPU9250 to migrate some of my projects. It is a great product. However, what I find to be a showstopper is when I unplug the USB-C cable, the M5 reboots. It does no matter the battery is fully charged or not. The M5 are useless this way as I plan to use in a car, and the USB power comes from a converter using switched 12V wire. All 4 units behaves the same.

I would like to know if this is a IP5306 issue, or a USB DTR/RTS issue. Also the way to fix this.
Without this issue, it is the perfect encased unit for my projects.

[Barky919]

I have tried jumping the Reset pin to +3.3V, but it still reboots when I unplug the USB cable:

• Internal battery; powered on. Connect the USB cable = no reboot.
• Internal battery; powered on. Disconnect the USB cable = immediate reboot.

[ajb2k3]

On the main pcb is a white square with a date on it. what does you have written there?

[Barky919]

Tnx;
It has "2018.3" on the small white square.

[ajb2k3]

@barky919 Please contact M5Stack support and tell them your issues including this reference date.

[progman]

II have same problem. Date is 2018.3 on board

[world101]

Just found this on Twitter: https://mobile.twitter.com/lovyan03/status/1162512607279890434

2200μFのコンデンサをM5Stackの3v3とGNDの間に入れてUSB挿抜テスト。ノーマルボトムでは成功、USB抜いてもリセットせずにそのまま動作しました。

Using google translate:
Insert a 2200μF capacitor between 3v3 of M5Stack and GND for USB insertion / extraction test. It succeeded in the normal bottom, and it worked as it was without resetting even if USB was removed.

[Barky919]

Thank you, will try today.

[cepics]

@barky919 said in M5Stack Gray reboots when USBC power removed:

Thank you, will try today.

it works??