Used esp32 pico v3 , designed own pcb , but failed to show on device manager

XUEZHI
Posts: 8
Joined: Sat Dec 18, 2021 5:10 am

Re: Used esp32 pico v3 , designed own pcb , but failed to show on device manager

Postby XUEZHI » Fri Jan 07, 2022 6:08 am

captain_morgan wrote:
Thu Dec 23, 2021 8:36 am
Not exactly sure if this is would cause failure to enumerate (I use the QFN24 version, with the VIO pin) but it appears RSTb should be tied to VDD not VBUS.
2.1 Power
In all cases, a 1 kΩ pull-up on the RSTb pin is recommended. This pull-up should be tied to VIO on devices that have it. On devices
where VIO is connected to VDD or devices that do not have VIO, this pull-up should be tied to VDD. The RSTb pin will be driven low
during power-on and power failure reset events.
so it should be a 3.3v not a 5v , also i may put resistor value too large? but i dnt think it will totally shut down the CP2102

XUEZHI
Posts: 8
Joined: Sat Dec 18, 2021 5:10 am

Re: Used esp32 pico v3 , designed own pcb , but failed to show on device manager

Postby XUEZHI » Fri Jan 07, 2022 6:10 am

boarchuz wrote:
Thu Dec 23, 2021 4:25 am
Check VDD on the CP2102N
cp2102n should connect to VDD is it? should not connect to VBUS? maybe thats why my board not working?

XUEZHI
Posts: 8
Joined: Sat Dec 18, 2021 5:10 am

Re: Used esp32 pico v3 , designed own pcb , but failed to show on device manager

Postby XUEZHI » Fri Jan 07, 2022 7:42 am

I only put power on VBUS but i didnt put for VDD....
My mistake ...
Now it shows on device manager , but still cannot load firmware, should be some other problem

captain_morgan
Posts: 42
Joined: Wed Dec 09, 2015 6:39 pm

Re: Used esp32 pico v3 , designed own pcb , but failed to show on device manager

Postby captain_morgan » Sat Jan 08, 2022 3:53 am

I'm not sure what exactly you did next but you should know the CP2102N has two power modes. Bus powered is where VBUS is attached to VREGIN like you have. In this case VDD become a 3.3 volt OUTPUT and should not also have VBUS connected to it. My prior suggestion was connecting RSTb to VDD

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