Questions tagged [usb]
USB is Universal Serial Bus. If your question relates to a specific chip, please mention it in your question.
2,836
questions
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35 views
LTE to Serial-over-USB [closed]
I am trying to develop a device to give simple, serial access to remote equipment. I imagined a small device - like a USB thumb-drive - which is plugged into (and powered from) the USB port of a Cisco ...
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1answer
23 views
Can I replace a usb micro b connector with JST xh connector?
I am working on a project where stm32 HID device is connected to a PC using USB cable. There is no need for unplugging on the product side, so can I replace a usb connector with JST one or directly ...
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2answers
81 views
Just chopped two USB cables,but one of them looks unusual
I just chopped two USB cables but one of them has three white cables and one grey. The other wire has normal colouring of:-Black, Green, White, Red
First wire:
White
White(has single orangestrand)
...
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0answers
26 views
Controlling Yihua 995D for USB control
I recently purchased a YIHUA 995D SMD Rework Station and me being the geek that I am wanted to see if I could perhaps control it (via USB/ATMEGA) by using my PC and touch screen instead of physically ...
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43 views
I accidentally plug my “usb c” (it connected to a ssd t5 samsung) to “usb a” port on my laptop
I accidentally plugged my "usb c" (it connected to a ssd t5 samsung) to "usb a" port on my laptop, it cause "a shock" (I guessed ¯_(ツ)_/¯), it just made my laptop shut ...
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1answer
60 views
Hi everyone, do somebody have experience with usb on assembly level for stm32?
Need a help with enumeration process, can't receive set_address from hub (PC). when answering to get device descriptor, getting reset but no set_address request only zero-length PKTSTS_SETUP_COMP->...
9
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3answers
1k views
Should I connect RXD to TXD and vice versa?
The circuit below is used to flash firmware to a microcontroller. There is a Micro-USB port on the PCB used to connect to a host computer. The USB lines (D+, D-, etc.) then go through a bridge chip (...
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43 views
Power distribution problem in multi-camera usb array
Problem Summary
My MacBook Pro (development system) can successfully capture images from 24 cameras in the multi camera assembly we have assembled. But when our assembly is attached to a new Raspberry ...
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0answers
27 views
Need help to power the device and connect a keyboard to android TV device [closed]
I have an android TV that I want to boot into recovery mode which I can do with a pin on the side. But I can't interact with the menu since it has only 1 micro USB which it needs for power. Is there ...
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0answers
26 views
USB Interfacing of TETRA device with microcontroller
I am trying to interface my TETRA device with the microcontroller using the USB interface. The microcontroller will act as a usb host while the TETRA will act as a USB device. I am using STM32F469I-...
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18 views
Building a KM switch, IC recommendations? [closed]
I'm looking for recommendations for an IC to switch my keyboard and mouse between my raspberry and pc.
Does anyone have some good ideas?
The circuit will have input for the keyboard and mouse and then ...
1
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1answer
47 views
5v USB to 12v DC
I purchased a 5V USB to 12V DC step up converter cable from Amazon. My intention was to use a USB power bank to power a 12V DC monitor, but I’m running into a bit of a problem.
When testing the cable ...
2
votes
1answer
88 views
USB and Battery switching circuit not working [and buck boost converter not working either]
I am an absolute beginner when it comes to electronics and this is my first circuit, so please excuse my ignorance and thank you for your patience and help.
I am trying to build a circuit which ...
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0answers
45 views
USB host and device in PIC32 controller
Planning to use same PIC32 controller for USB A (Host) and USB B (Device).
Connecting any one USB port to normal USB lines (D+ & D-)
Connect one more USB port to UART pins, again which will ...
0
votes
1answer
55 views
Migrating from USB 3.0 Micro B to Type B connector
The current design uses a Micro B connector for the USB 3.0 connectivity. Unfortunately, this connector is susceptible to mechanical stress if the PCB is not handle with care, which results in ripped ...
1
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1answer
74 views
Can USB 3.0 tracks be closer together than 5W if they're quite short?
I am currently laying out a space constrained PCB which contains some USB 3.0 Superspeed differential pairs. These USB signals are confined to the PCB, going from a Cypress CX3 chip to a USB 3.0 Hub ...
0
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1answer
36 views
Wiring SMD Micro USB to ESP32 MCU
I am trying to connect a SMD micro USB to my ESP chip using a USB to UART bridge. The schematic being followed is attached below. But there are a few things on the diagram that I find confusing, the ...
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2answers
41 views
5 Pins soldered from a USB 2.0 type A cable
I have just recived a new product and I want to replace the permanent USB cable that is soldered to the board with a shorter female end USB. The problem is that when I disassembled the item I saw that ...
1
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0answers
80 views
STM32F103VCT6 Custom board not working
I made a custom board using STM32F103VCT6 MCU as shown in the attached schematic below. I soldered all the components as per the schematic and powered it on. The board worked for sometime and stopped ...
2
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3answers
84 views
Why are common mode chokes with 90 ohm @ 100 MHz recommended for USB 2.0 Hi-Speed data lines?
When one looks at common mode chokes for USB 2.0 applications choke manufacturers always recommend CMC with a common mode impedance of 90 ohms @ 100 MHz.
Example
How does this relate to
USB 2.0 ...
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2answers
52 views
USB Host and Device communication happen in the same controller preferably Pic controller
Working on new project, which requires- 1st port is for HOST function with Type A connector and 2nd is for Device function with Type B connector & not support USB host port and device port at the ...
0
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1answer
50 views
Daisy Chain USB Devices with USB2422
I'm designing a keyboard and I want to be able to daisy chain another USB device through it. I have a Drop ALT that does this and I really like it. It has two USB C ports and you can connect either ...
0
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0answers
24 views
USB differential data lines pulled up to 5 V
My design uses the compute module 3+ board from the raspberry pi foundation. I used the FSUSB42MUX schematic from the CMIO board to have a slave/host USB port. My problem is the D+ and D- lines are ...
0
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2answers
41 views
Efficient strategy to acquire multiple spi interfaced sensors data in parallellover several spi buses?
I want to continuously acquire temperature from many ( ~20) thermocouple MAX 31856 all on one PCB ultimately. This chip interface with spi. The project language is python
Because of the sensor latency,...
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0answers
38 views
USB vs Bluetooth power saving
I need to transfer almost all kinds of data (arrays, video/audio stream, control signals) between mcu and an Android smartphone. MCU will accumulate data from smartphone and further send it by other ...
0
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1answer
22 views
Did I connect the FT232 with the Digital isolator Data wired the other way?
I think I connected the Data wires from the FT232RL to the USB Isolator ADUM3160BRWZ upside down.
I just want to confirm this, Data - of the one should be connected to Data + of the other ?
Datasheet ...
0
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1answer
64 views
Is it possible to solder a USB cable directly to a board?
I'm working on a design for a PCB carrier for Raspberry Pi Compute Module 4, and I need to connect by USB 3.0 a wire to this carrier board. Is it possible to solder it directly to the PCB in order to ...
1
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1answer
77 views
USB plug adaptation for Dremel 7750
So, I recently threw out a bag of random chargers I didn't think I was using anymore. Later I found that my Dremel charger was part of these. I did however save all the connectors and just threw out ...
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2answers
53 views
How to choose DC resistance parameter of a USB 2.0 common mode choke?
How do i know whether i have to choose a bigger sized common mode choke with lower DC resistance for USB 2.0 D+/D- lines or using a smaller one with higher DC resistance is also just ok?
In fact there ...
1
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0answers
38 views
Differential pair length matching considering phase
According to Microchip's document Implementation Guidelines for Microchip’s USB 2.0 and USB 3.1 Gen 1 and Gen 2 Hub and Hub-Combo Devices, the Superspeed differential pairs should be length matched ...
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0answers
7 views
Receiving and displaying video-over-usbc with a laptop [migrated]
Not sure this is the right place to ask such a question, but i am wondering: now that video is delivered over usb-c (i suppose over displaylink but idk if there are other protocols as well), would it ...
0
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2answers
39 views
Mini USB Male to 3.5mm female tips?
I got some helmet speakers for free from my work. I was hoping to just install them and them plug in a 3.5mm connection to my phone and play away. But the speakers have a mini usb since you "need&...
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0answers
47 views
Charge device and power other devices over the same USB port
I'm creating a raspberry pi based mobile device. It has a LiPo-battery and a lipo charger, which will power the raspberry pi. The device should have one usb port, over which the device can be charged ...
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1answer
63 views
How to use USB 5V output for 3.3V webcam module
I want to use an old webcam module from a notebook which needs 3.3V. Therefore I want to solder it to a USB cable and use it at an USB port on my computer.
For now I use the 3.3V source from a ...
1
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1answer
42 views
Which USB spec actually defines support for Dual Role Device? Type-C or USB 3.1?
I'm trying to get a concrete answer on what determines DRD support... the port type (USB-C) or the protocol type (USB 3.1). Besides the poor naming scheme with USB 3.0/3.1/3.2, there's a lot of ...
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44 views
Is a USB charging A-to-C Y-cable a really bad idea?
I know it's non-standard, just trying to figure out if it could work safely.
On one end is a standard USB-A plug that can be plugged into chargers or computers.
On the other end are two USB-C plugs ...
4
votes
2answers
414 views
What was the communication protocol used on board the Apollo moon lander?
It seems that the development of TTL was contemporary ~1961 the maiden moon landing of the Apollo vehicle, while the development of one of the oldest digital signalling standards RS232 using the UART ...
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4answers
140 views
Is there a way I can convert from USB to LVDS UART (~1Mbps)? [closed]
I'm working on a spacecraft that requires very low noise levels so it was requested that we pursue LVDS UART. So it's using something similar to RS-422 because it's differential, but instead of a ...
0
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3answers
56 views
Smart phone USB-C Data and Power
I have a Samsung Note 9 with a weird technical issue that has to do with usb standards. If I plug in the phone to a PC using a USB-C to USB-C cable, the phone will charge and transfer data to the PC. ...
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1answer
87 views
How to convert USB 2 device with USB A connector to flippable USB C
This question has been asked a couple of times, with some interresting answers but I need to go further in depth. My device is a Corsair Void Pro USB. I want to change its USB A connector to a USB C ...
0
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1answer
43 views
Connecting USB shielding of two hosts and one peripheral
I'm making a simple project regarding switching USB connection between two computers. I would like to know if it is safe to connect USB shielding for pc1, pc2 and peripheral together, while keeping ...
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0answers
52 views
Why usb3.1 Type-C has two Dbus, RXbus and TXbus?
So I am using a camera and making it connect to a hub. The hub only has 9 pins(single Dbus, RXbus and TXbus) while camera has usb3.1 which has double if all these buses (D,RX and TX). So to connect it ...
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2answers
72 views
Hardware that can spoof mA usage or cause it
I have a device that is expecting to trigger when the TV turns on/off except I can't plug the TV directly into it. I have a WeMo smart plug which is meant to spoof the TV turning on/off however, I ...
0
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2answers
59 views
Do I need to use a diode when combining two usb 5 volt lines?
I want to use a USB bus powered device with my laptop. However, it draws to much current from the laptop and won't work. Do I need to use a diode(s) if I solder another 5 volt line powered by a wall ...
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3answers
50 views
Can FPC 0.5mm cause usb 3.0 interference inside itself?
I am designing an 4-port USB 3.0 hub and using fpc 0.5mm connector to connect it to other usb devices. Will using fpc 0.5mm cable have interference because of high data rate? I am talking about the ...
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0answers
25 views
we designed circuit using usb2240 when started USB side is working fine,sd card nothing shows up:
we designed circuit using usb2240 when started the USB side is working fine. However, when I put in a micro-SD card (FAT32 formatted, with some sample files for checking) to the holder, nothing shows ...
0
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1answer
53 views
What is the reason why USB plugs connect power before data
I am designing USB unplugging/plugging hardware and I wanted to know why USB plugs are designed such that the power leads make a connection before the data. Is it purely to ensure that data is not ...
1
vote
1answer
49 views
High-speed Network Link between two Processors without Cable
My goal is to set up a high-speed network link between two identical processors (Qualcomm SOMs) that will be present on the same PCB. Since I have severe restrictions on weight I cannot use the ...
0
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0answers
35 views
External 8MHz Oscillator not working for STM32F405RGT6 custom Hardware
I am using custom-designed hardware for STM32F405RGT6. I need to put the chip in DFU mode to perform a DFU firmware upgrade. I am able to flash the chip via the STLINK, which indicates that the chip ...
0
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1answer
31 views
Pre-charge circuit for USB devices
Mains SMPS converter chips (e.g. L6565) usually have pre-charge function to prevent the inrush current into a completely discharged capacitor. In high-power PSUs, a precharge resistor is often used, ...
