VBUS should still connect to the USB connector power pin so that the CP2102 can enumerate when it detects presence of a physicall USB connection.VDD and REGIN can also be tied together if the circuit can provide a well filtered 3.3V. You can connect REGIN pin of CP2102 to this power source (consult the datasheet for voltage limitations). This configuration is suitable when you have a mains powered application or an application where power consumption is not very relevant to you. Programs for cars and diagnostics VAG EEPROM Programmer v1.19 VAG EEPROM Programmer v1.If the rest of the circuit uses power from the same USB port, make sure you account for the total power consumption and keep it under the maximum specified USB host current capability.This is to ensure that the short circuit or overcurrent protection inside the USB host does not trip up when the decoupling caps draw a surge of current on connection. Note that the total capacitance on the USB power lines should be 4.7uF or less in typical applications.That will ensure that the CP2102 does not run your battery down for no reason. If your application is powering the ESP32 or ESP8266 from another source such as a LiPo battery pack, this mode is the one you should use. This configuration is suitable for cases where you want the CP2102 to activate only when the USB connector is plugged in. In the bus-powered mode, the chip gets its power from the USB port. In the programmer schematic presented above, the CP2102 is configured to bus-powered mode.
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