All Questions
19
questions
0
votes
1
answer
82
views
Is there a voltage limit implemented in USB A to USB C charging?
We have a supplier that designed a battery pack for us. The pack has a USB C port, and comes with a USB A to USB C cable.
The cable only has two wires (V+ and GND), with CC resistors embedded in the ...
- 3
0
votes
2
answers
136
views
Charge USB C cable with no CC pin
I just want to make a "USB C" charging cable from 5V power supply (have cut cable w/ red black green and white pins connected from factory). I just want to use 500 mA max.
How do I connect ...
1
vote
1
answer
123
views
Asymmetric charging with (symmetric) USB C
I'm wondering if asymmetric charging behavior (does it differently depending on which orientation is used on the cable connector) is a feasible failure mode with USB C, which is supposed to be an ...
- 113
0
votes
1
answer
105
views
USB C Power delivery doesnt work properly
I'm designing a 5V Power source for USB-C devices.
Based on this hackaday article I've chosen 10k Pullup resistors between the CC lines and 5V to indicate that my source can supply up to 3A.
My power ...
- 464
1
vote
1
answer
66
views
Android tablet, RFID reader module + Charging with one USBC port [closed]
I came here to ask you for some advice, comments or a completely different approach to my project.
I have an Android tablet with a USB-C port and I would like to connect to the port RFID reader module ...
- 11
2
votes
1
answer
333
views
Creating a USB-C pass-through with power charging detection
I want to check if a tablet or laptop has a USB-C cable plugged in so I can have a visual confirmation that it is connected correctly.
Most of the tablets I use do not have any visible feature that ...
- 797
0
votes
1
answer
83
views
Is it dangerous to charge laptop from car batterry? [closed]
Can we use a laptop charging adapter without a car? Is it dangerous?
Example: 12v car battery -> automobile auxiliary power outlet(car cigarette lighter) -> car adapter DC-DC with PD 12v to 20v -...
-2
votes
1
answer
114
views
Reverse engineering: Why is there a PD IC in this Adapter?
I have a question regarding an Ethernet and USB-C(PD) to USB-C Adapter:
Amazon-Link: https://www.amazon.com/Ethernet-Charging-Thunderbolt-Chromecast-Chromebook/dp/B09MTN8ZT3/ref=sr_1_3?crid=...
- 1
2
votes
1
answer
467
views
How does USB passthrough charging work?
I am currently making a keyboard for a phone. It connects to the phone using USB-C.
I'd like to be able to charge the phone while the keyboard is connected, so I need some kind of pass-through ...
- 879
3
votes
1
answer
4k
views
USB-C power negotiation
We designed a power board that can deliver 5V and 3V3. Those two voltages are provided by two boost/buck converters that can deliver 3A each. The board accepts power from a USB-C socket which is ...
- 31
4
votes
2
answers
2k
views
USB communication between Android phone and MCU while continuously charging the phone
I am working on a project where I have to communicate between an Android phone and a microcontroller through USB and continuously charge the phone. I have very limited experience with USB and would ...
- 41
0
votes
2
answers
255
views
charging speed from USB QC3.0 to USB-C PD
I am trying to find this information online for a while but I cannot find any precise info, thus Q on this community seems appropriate.
I would like to know if a device having USB PD charging port (...
- 103
2
votes
1
answer
510
views
How to build an usb c to micro usb cable? [closed]
I bougth a new phone, it came with usb type c charger, i mean there's a usb c port on the charger and a usb c to usb c cable. I had a wireless charging base wich i want to use with my new phone, this ...
0
votes
0
answers
44
views
Battery and External Power without Diodes Circuit
I'm designing a power system for my project. My project is powered from standard 18650 li-ion battery (or other 3.7V battery) or from USB 5V power source. Originally, my requirements were broader, I ...
- 3,623
0
votes
2
answers
3k
views
Simplest adapter resistors to charge a phone while the phone is an OTG host
I tried to make a micro USB to USB-C adapter by making the connections shown with red lines below (so 11 of the 24 USB-C pins are used and other pins float). This is the view looking into the USB-C ...
- 564