Could I connect a Micro USB and a USB-C in parallel? Is it possible to include b - Page 1
Forum section: electronics / beginners

author: Haruka156
author_rank: Newbie
timestamp: June 05, 2024, 01:03:39 am
content: Hello everyone, this is my first post here. I hope you can give me a hand. I've been researching this topic for days, but I haven't given up yet. Let me explain:I have a somewhat old tablet with Windows 8 that comes from the factory with a micro-USB receptacle connector. It belongs to my somewhat forgetful father. After formatting it, I thought about changing the micro-USB port to a USB-C port. He has lost the charger, and although it was recommended that I buy an adapter, I'm sure that will end up being lost as well. I want to create something integrated into the device. I thought it would be better if I could replace the port, as USB-C chargers are easier to find here in Argentina.I was not able to solder the new USB-C connector using the same positive and negative pads because the USB-C receptacle is larger, and the micro-USB in that place has some multilayer ceramic capacitors very close by that obstruct me from soldering it. So, I thought I could solder the USB-C receptacle in another place on the PCB (on some ground plane) and keep the micro-USB port in its place. This way, I wouldn't have to cover the old hole, and both ports could be used to charge the same battery, as long as they are not used simultaneously. This didn't seem too difficult to me since the port is only used for charging and does not support OTG functions.After investigating diode OR-ing and power mux configurations, I realized that neither configuration would be convenient due to the voltage drop of the diodes, which would largely limit the charging capacity. I also researched charging signatures to determine the charging capacity of the tablet I was experimenting with. Everything indicates that it uses the BC 1.2 DCP protocol, and the data lines are shorted through a 200Ω resistor. However, the case states that the input voltage is 5 volts at 2.5 amps, and as I understand it, BC 1.2 DCP supports up to 1.5 amps. Could this be a more recent implementation, or am I mistaken?At the moment, I have both micro-USB and simple USB-C connectors like the ones in the photos, 5.1k pull-down resistors for a possible connection of the CC pins of the USB-C, copper sheets to make the pads, epoxy resin to glue them to the board, and USB-C modules on Arduino-type PCBs. According to this publication (https://forum.arduino.cc/t/how-to-replace-mini-usb-with-usb-c/937776), pin 5 is ID. What would happen if I made a connection with enameled copper wire in parallel between both ports (whether simple ones or those mounted on the PCB) and connected it to the system as in the diagram?If it is not possible to do this with both ports, could I then use the USB C module and if it is true that pin 5 is the ID pin, make the connections from the micro USB pads without risks?Thanks in advance for your answers.PS: Sorry for my possible grammatical errors in English, I am learning the language.If it is not possible to do this with both ports, could I then use the USB C module and if it is true that pin 5 is the ID pin, make the connections from the micro USB pads without risks?