USB Device Not Recognized for STBC08PMR

AE104 · ‎2024-04-11

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.

willzhou · ‎2024-04-11

Hi
PC USB is 5V /500mA and STBC08 is 800mA standalone linear Li-Ion battery charger with thermal regulation ,

PROG pin connect res R2 is 2K, based on datasheet, recommend you modify this R2 value.

Based on "the two LEDs are light up " means 00 pre charge mode.

file:///C:/Users/zhouwill/Downloads/an2407-800ma-standalone-linear-liion-battery-charger-with-thermal-regulation-stmicroelectronics.pdf

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