USB Not Recognized

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uranyumx

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Hello,

On my custom designed PCB, there is a USB port for battery charging and programming ESP32 microcontroller. When I plug in to the PC, I get "USB Not recognized" message. In addition, the two LEDs are light up. In the datasheet of the charger IC (STBC08), it says there is "not enough power". But I checked the power pin (1st pin) of the USB port, there is 5.1V. So why is there a problem? Do you have a solution for that?

I attached the schematic of the power management part.



Thank you,
 

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Hi,

The PC message: "USB Not recognized"
means the USB_host inside the PC can not communicate with the USB device.

From your schematic there is nothing that can communicate vis USB.

So, I´m not surprised about the message.

***
Regarding your LEDs.
What do you expect?

****

Btw: Your schematic shows "3.3V linear voltage regulator"
It does not seem to be "linear"

Klaus
 

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I have USB-UART bridge as well for programming the microcontroller.
I expect "Power ON" LED is ON only.

 

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Hi,

CP2102:
* missing power supply capacitors
* missing GND connection

Klaus
 

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    uranyumx

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Thank you @KlausST ! I fixed the GND connection with a jumper wire. Are the power supply capacitors critical?

Why are the both two LEDs keeping the lights ON?
 

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Hi,

uranyumx said:
Are the power supply capacitors critical?
Click to expand...
I personally think the manufacturer knows best. If they recommend the capacitors, I´d use them.
If you don´t use them, don´t complain when it (temporarily / randomly) fails.

*****

uranyumx said:
Why are the both two LEDs keeping the lights ON?
Click to expand...
Again: What do you expect? .. and why?

I see nothing wrong ...

Klaus
 

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I personally think the manufacturer knows best. If they recommend the capacitors, I´d use them.
If you don´t use them, don´t complain when it (temporarily / randomly) fails.
Click to expand...
I see, let me check it.

Again: What do you expect? .. and why?

I see nothing wrong ...
Click to expand...
All right, let me try to flash the firmware of the microcontroller.
 

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Did you see what appears on Device Manager panel on the devices tree ( assuming you are on Windows ) ?
If so, did you check if at least what error was diagnosed and/or if some device ID was caught ?
If so, did you search for its device driver somewhere ?
 

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After fixing the GND connection, I saw the USB-UART bridge IC name. Then I successfully downloaded it. Now I will try to upload the firmware.
--- Updated ---

FvM said:
I'm missing info about voltage at +Bat and 3.3V node.
Click to expand...
The battery voltage is 3.7V (represents with Bat+)
 

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