Questions tagged [usb]
USB is Universal Serial Bus. If your question relates to a specific chip, please mention it in your question.
3,563
questions
-1
votes
0
answers
24
views
USB C to A cables [closed]
I have many USB C to A cables, but only one meets the specs and works for me
https://www.usb.org/sites/default/files/USB%20Type-C%20Spec%20R2.0%20-%20August%202019.pdf
P86 USB Type-C to USB 3.1 ...
- 1
0
votes
2
answers
46
views
USB C Power Delivery using below schematic?
I have limited experience with USB C and I want to design a board which needs to charge both a smartphone and another subsystem which draws around 1W. I have read that by just connecting a 5.1k ...
- 65
0
votes
0
answers
37
views
What is the meaning of a 28k pull-up resistor in an USB A-to-C cable?
Since that debacle a few years ago, I assembled a small test harness where I plug every new A-to-C cable that I get to check for the 56k pull-up resistor between CC and Vin and toss out the ones that ...
- 23
1
vote
0
answers
58
views
USB connector: inward positioning relative to front panel
I am going to use 292336-1 USB connector and having difficulties figuring out the information on recommended inward offset relative to front panel surface.
The datasheet, in its recommended PCB layout,...
- 7,088
0
votes
1
answer
45
views
Connect ADS1298 to PC via USB
I designed an ECG board based on ADS1298 and schematics in this document (pages 52, 53, 55) with some customizations. I should connect it to PC via USB.
As I found here, TI evaluation board uses a DSP ...
0
votes
2
answers
72
views
Wiring USB-C connector to micro-USB
I have some problems wiring the micro-USB cable to a USB-C connector. I have used the wiring scheme found here, but neither the data are transferred nor the power is supplied to the device.
The ...
0
votes
1
answer
47
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
1
vote
0
answers
40
views
FT232H USB to I2C Device Not Detected
I am using an IC from FTDI, FT232H. I am using it to connect to a video decoder, via I2C, from a USB port on my type6 CPU module. I am able to detect the FT232H and install the proper driver on the IC ...
- 95
0
votes
0
answers
22
views
How to design dual mode USB Type C power bank?
I want to design power bank that has 2 USB Type C ports and uses a large lithium battery inside.
I want to be able to use 100W power delivery when possible. I am absolutely overwhelmed by looking at ...
- 147
0
votes
0
answers
42
views
Can someone help interpret the wiring for this camera? [closed]
I am trying to figure out how to wire this camera from aliexpress.
I think I've figured out that D- and D+ and 3.3V and GND are the pins on USB， but I'm not really sure what LED power, PTC, or ...
- 19
0
votes
1
answer
48
views
USB 2.0 Full-speed differential impedance
The USB 2.0 Full-speed specifications, and numerous other sources on the internet list a signal differential impedance of 90 ohms. However, most designs use a pair of 22 ohm termination resistors on ...
- 403
0
votes
0
answers
65
views
USB extension with DC-DC (step-up/down) conversion? [closed]
I want to use a RTL-SDR at a remote location via USB 2.0 to ~10m instead of buying an antenna cable. At the end there is no power available, otherwise I would have used a USB hub. How to deal with ...
- 103
0
votes
2
answers
32
views
USB 3.0 SS lines issue
Can you route USB 3.0 SS lines to two PCB's but the USB controller is located on the second PCB?
The PC host is connected to the first PCB over a usb c-c connection (center usb port in image). Then ...
0
votes
2
answers
56
views
PCB Design review for STM32 USB-UART bridge
Could anyone review the schematic for CH340 chip. My goal is to drive STM32F030C8T6 automatically into bootloader mode while uploading code.
Unfortunately I am not able to program this board without ...
- 1
1
vote
1
answer
33
views
Circuit to handle multiple PSU input options [duplicate]
I'm trying to design a simple circuit that can handle different power supply sources for my microcontroller project.
The microcontroller and its associated circuitry need 3.3V, and additionally I need ...
- 461
0
votes
0
answers
96
views
Can I use SATA traces on PCB for USB 3.0?
Can I use SATA traces (SSD_RX+/- & SSD_TX+/-) on a PCB for USB 3.0 data transfer? I am designing a test system for PCBs. There are SATA lines and I think this 2 pairs can use for USB 3.0 data ...
- 51
0
votes
2
answers
41
views
USB Type C mobile phone charger Design using MPQ4242-AEC1
I am planning to design a USB type C charger for my bike. This is the first time I am designing a USB charger. I decided to use MPQ4242-AEC1 from MPS.
A 12 V will be coming from my battery. As per my ...
- 2,217
0
votes
0
answers
35
views
Configuring a USB-C/PD Controller IC for a Type-A Output
I'm working on a new USB charging product to be installed on airplanes. I understand the power requirements well enough: it has to take 12V-32V input and be able to provide up to 45W of power per ...
- 31
0
votes
0
answers
35
views
Will my circuit to add status LEDs to indicate VBUS current draw work as intended?
I am a mechanical engineer with very limited electronics knowledge. Recently I decided to undertake a project to design a USB 3.1 hub for a personal project, to get a better understanding of ...
- 1
0
votes
1
answer
53
views
Seeking USB-C Female PCB Connector for Razer Kraken X Headphones Adaptation [closed]
I’ve recently undertaken a project to adapt my Razer Kraken X USB headphones from a USB-A to a USB-C connection. Originally, these headphones featured a male USB-A cable designed for PC connection. I ...
- 103
0
votes
1
answer
66
views
How to use one USB-C port between 2x ESP32-S3 - Switched by toggle switch?
I am trying to switch over a USB and it's associated Data +/- traces with a physical toggle switch.
I've tried to work out how to do it with just the switch, but I don't think that would work as it ...
0
votes
1
answer
55
views
Transistor as a switch with square wave input [closed]
I want to construct a circuit that contains a transistor and a LED. I have a supply square wave input voltage(0-5v). Help me to construct a circuit when input is 0v ,if LED on and input is 5v then ...
- 3
0
votes
0
answers
8
views
How to get 50 points so I can comment on something that I think is useful information [migrated]
1.The problem is I need 50 points to be able to leave a comment on something and I feel the information is relevant.
2.I have went as far as making a name then attempting to comment only to find a ...
2
votes
3
answers
857
views
Why are CC1 and CC2 only connected to USB-C?
This is a schematic where USB-C is used to power a circuit device.
Notice that there are only VBUS and CC1 and ...
- 1,145
-1
votes
3
answers
33
views
USB-A - USB-C cable with 100W [closed]
I have a Xiaomi phone that shows 3 options when connecting the charger: Charging, Fast Charging and Turbo Charging. (Not sure which wattage is each one)
I have a fast charger that when I use a USB-C - ...
- 101
0
votes
1
answer
40
views
USB Type-C receptacle vs plug
I am learning about USB Type with the help of this material.In that you can see that two figures Fig1 and Fig2 says USB Type-C receptacle and plug.
May I know the difference between USB Type-C ...
- 59
0
votes
0
answers
65
views
USB-C Pogo Pin Coupler Troubleshooting
I've been working on this project for a while now and have hit a bit of a wall.
I've been designing a magnetic cable coupler for a automotive device (Comma3X). The device communicates with the car via ...
2
votes
0
answers
40
views
Mechanical USB interrupt [closed]
I'm quite the noob to USB controllers. I want to create a mechanical interrupt for USB power for a connected device.
Long story. Car has a USB a connection (probably3.0) for the stereo/phone ...
- 21
0
votes
2
answers
140
views
Are there any egregious errors in this design?
I'm attempting to design a USB 2.0 hub based on the USB2514Bi, but I seem to be running into some issues. The hub will have an additional daughter board, hence the switches and breakout headers, but ...
0
votes
0
answers
11
views
TUSB106 To DP Port and USB
I have a SOM which is having USB Type C + DP , Now I need to develop a carrier Board for the following requirement as given in Block diagram.
Is TUSB1064 Will capable of doing that, as mentioned in ...
- 11
1
vote
1
answer
43
views
USB to USB Back-Side Device Communications [closed]
I wonder, if two USB devices are connected to a single computer, may they correspond without any interaction with the host computer? I understand the need to an active component in the network. What ...
- 11
6
votes
3
answers
1k
views
Does USB-C Power Delivery require both CC pins or D+/D- pins?
I'm working on a project to update a device to use a Li-Ion battery rather than non-rechargables. I would like it to be charged via USB-C.
I have previously used IP2721 to handle the power delivery ...
- 85
0
votes
1
answer
97
views
Powering a dc motor from a robotics set with a USB 3.0 PC port
I got my hands on a Gigo microbit robotics set.
It uses a control box to house the microbit. As you can see from the control box specs, it uses 6 AA batteries, but it can also use an external micro-...
- 101
1
vote
1
answer
114
views
Solder pads ripped - charging via test pads?
My uncle asked me to repair a tablet but when I opened the tablet I saw that the micro USB connector was completly ripped off the board and I lack the tools to scrape free some of the copper to solder ...
- 11
0
votes
1
answer
56
views
How do I troubleshoot the ESP32 USB JTAG/UART interface on a new PCB design?
Question
How do I troubleshoot the ESP32 USB JTAG/UART interface on a new PCB design?
Background
My son is working on a project to track satellites and this is the first time that we have worked with ...
- 1,912
0
votes
1
answer
61
views
Is this circuit safe to be powered via USB for my 3 V 350 mA LEDs?
I'm building a simple circuit connected via USB to a number of LEDs in parallel, but I've always heard that USB connections are 5 V so I put a 10 Ohm resistor in series with the LEDs as shown on the ...
- 15
0
votes
1
answer
66
views
Custom PCB using ESP32 is rebooting infinitely after upload
I have designed a schematic for a project using the ESP32-WROOM-32. The ESP32 will upload code (without having to press the boot button and this is a first hint at error), but the ESP32 continues to ...
0
votes
1
answer
72
views
How to connect multiple devices using one USB port and a breadboard?
I have an audio device with 8 channels, every 2 of which need to be powered by a 5V power outlet. Up until now, my lab used USB chargers to solve the problem.
But now I have to improve upon it, and I ...
1
vote
0
answers
87
views
Monitoring Power/Connection status with INA219 and Arduino
Hey all I am looking to monitor the voltage/plugged in of a USB-C device.
I am using the INA219 to monitor the voltage using the I2C (SDA/SCL) lines to my Arduino (not shown in the schematic).
I just ...
- 743
0
votes
0
answers
83
views
Plugging in USB causes MCU to die
I have seen the below circuit at work. It has two supporting circuits on one PCB, each with its own ground.
The circuit with the micro-USB is tied to the MCU circuitry via L3, L4, and C30.
The MCU ...
- 2,207
0
votes
2
answers
85
views
Is it possible to send 18 watts via USB-A?
Actually this might be a cable question. I see wall warts out there advertising 18 watts.
3A USB Type-A & USB Type-C Wall Charger
The spec says "Output Voltage- 1 x USB Type-A 18 W"
I ...
- 1
0
votes
0
answers
41
views
USB 2.0 FS device over USB C with both power directions
I'm designing a battery-powered device with the following requirements:
rq1: (a) Charge the device's battery over a USB C receptacle, or (b) provide power over the same receptacle. Both directions ...
0
votes
1
answer
79
views
How to position the 1.5 kΩ pull-up resistor on USB Type-C D+ connection?
I am designing a TYPE C plug with STM32L432KC MCU and was wondering how to physically position the 1.5 kΩ pull-up resistor on D+ connection.
(male plug --- ft323 --- mcu)
Should it be next to the MCU ...
- 60
0
votes
1
answer
36
views
Standard USB OTG to USB C IC [closed]
I have a board that supports USB-OTG, with an integrated PHY in my MCU. It's fairly trivial to support a keyed connector (like Micro-B), but I figure USB-C would need a seperate chip to handle the non-...
- 143
1
vote
1
answer
57
views
DIY project - Listen to Guitar Amp on a USB headset [closed]
I have a Fender mustang GT40 which has a 3.5mm female audio jack connector so that the audio from the amp goes only to the headphones (crucial for me since I live in an apartment). It works wonders ...
- 15
0
votes
0
answers
62
views
Why are USB galvanic/isolators needed on battery operated devices?
Why are galvanic/optical USB isolators used?
I am an astro-photographer who does imaging at remote site locations on battery. I never encountered galvanic/optical USB isolation in devices until ...
0
votes
1
answer
62
views
Will this battery to USB auto switching circuit work?
I want to have a project be powered by six AA batteries or USB. When the USB cable is attached the circuit should automatically switch off the battery input and start using 5 V from the USB.
This is ...
0
votes
0
answers
147
views
ESP32-S3 USB Serial is read-only
I have a ESP32-S3-DevKitC-1 board. It has two USB ports, one connected to a USB to UART chip (brigde), the other connected to SoC directly (USB Serial).
The USB Serial is much faster than bridge for ...
1
vote
2
answers
74
views
USB Current Oscillation ~ 100 mA Without Device [closed]
Apologies for my lack of deep knowledge here - this is not my background and I am definitely an amateur so I greatly appreciate your willingness to help me!
Background: I was curious about the ...
- 11
1
vote
2
answers
67
views
STM32F417 DFU bootloader fails to start HSE crystal
I have a problem with a custom STM32F417 board. On some boards the DFU bootloader works fine, while on other ones it fails to connect by USB. In my custom firmware all boards connect fine by USB.
...
- 8,442