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mCookie-USBTTLC module, is a switching chip based on CH340 USB bus, and it can be directly connected with mCookie-Core or mCookie-Core+, to make them communicate with the computer, to download programs and debug serial ports.
Can external power supply be used together with USBTTLC to supply power to the system?
Because the 3.3 power current of the current version of USBTTLC is too small (within 100mA), it is not recommended. In test phase, you can only use USBTTL, and after the completion of the program debugging, you can use external power supply directly to supply power.
When downloading programs, you can use it and it can be reused.
When debugging programs, you can directly use MicroUSB to supply power.
To learn more about the mCookie-USBTTLC module specification, visit: mCookie-USBTTLC Wiki page.