Questions tagged [usb-device]

Quesions about the design of USB devices that connect to a USB host, such as a PC.

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USB IC from Cypress does not let me charge devices with power adapters with unconnected data pins

I have a product using the Cypress CY7C65213 USB-UART bridge controller. We started to face some field problems where the clients reported that the device was not charging with some power adaptors. I ...
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SD storage class controller error (code 10) on Windows 10 but not windows 7 [migrated]

We have a unit that has a VUB300 SD card reader IC designed in to allow the offload of data from an SD card over USB. When connected to a windows 7 PC, the card reader works fine and I can read / ...
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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 ...
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Can I remove the power wires of USB 3.0 and still use data wires? [closed]

So I have this SATA to USB converter for 2.5 inch HDD I want to cut away the power port (5v) and use the remaining data port with an separately powered (12v) 3.5 inch HDD. I was wondering if this ...
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How to connect USB to an ATmega328p?

I'm making a board that requires an ATmega328P to respond to commands from a computer. It needs to be connected with USB. I am new to this and trying to figure out how to best do this. I know I'll ...
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USB-C data-only cable for phone to battery-powered accessory

Basically I have phone and a battery powered USB/Bluetooth controller. The Bluetooth connection isn't great, so I want to use it wired. However it drains my phone battery to recharge its own. I'd ...
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FT231XS FTDI USB UART self-powered circuit

I haven't been able to find a full example of a self-powered FT231XS circuit. I was hoping to get feedback on what I have put together from studying the datasheet (any glaring issues?): 3v3_RUN is my ...
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USB-C device (UFP) sourcing power?

I would like to design a device with an USB type C connector, USB2.0 only, no PD function, UFP data role but the power role is source only. The device is a self-powered peripheral that sources energy ...
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Does this board do anything else than exposing D+,D- and Vcc,Gnd to some plugs?

I disassembled a JBL Flip 4 blutooth speaker and put out its micro-usb board. I found an image of the bottom and of the top on ebay. I have also made an image of my board, but it's full of glue. So ...
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STM32 USB HID Keyboard skipping key presses

I have an STM32F3DISCOVERY evaluation board which has an stm32f3 mcu on it. I am trying to use the board to emulate a USB keyboard. I used the STM32CubeIDE to enable USB communication, configure the ...
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How to go about repairing a ripped solder pad on a USB flash drive?

I have a flash drive that sustained damaged the USB port. It looked like it just needed to be reseated with fresh solder and some TLC so I went ahead and started to remove the damaged port and then ...
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LED Matrix to reduce current consumption

I'm trying to control RGB LEDs via USB. All LEDs have the same color, so I'm controlling them with only 3 PWM signals (generated from a PIC). The problem I'm facing is to reduce the current needed in ...
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connecting USB2.0 to USB Type C plug

I have a camera that connects to USB2.0 Type A I would like to connect it to my laptop that has a USB Type C receptacle.. I can't use a converter. What is the wiring diagram for this solution? I have ...
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"Invalid PID Sequence"

I'm trying to create a HS USB device. The chirp sequence goes OK, but the device won't fullt enumerate. Device Manager reports "The request for the device descriptor failed". SO that's ...
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USB 2.0 Device Signal Quality xHCI Testing

I haven't run this test in 3-4 years and when I did it was the EHCI version. If I understand correctly, I need to use the xHCI version because my host controller is a new-ish laptop that supports up ...
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Using TUSB2036 for two USB 2.0 Ports

I want to use TUSB2036, where the upstream is a USB2.0 port (USB2_DP, USB2_DN) comes from Intel CPU. For my design I need two USB2.0 downstream ports for WWAN and WIFI M.2 Application. Can this device ...
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Do I need a license to use a USB-A plug on my power cable?

I want to make a product that has a power cable with a USB-A plug on it. There is no USB socket on the device, the cable just enters the device, similar to the HomePod mini. The idea is to instruct ...
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Using USB5742 USB 3.2 Gen 1 HFC IC with pre-configured firmware

Due to Chip Shortage problem, I have been looking for USB 2.0 Hub Controller for long time now. I need only two USB 2.0 Downstream (PHY) ports for my design. I contacted MicroChip and they have the ...
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What would happen if earth ground and the PCB ground came into contact?

So I have an ATX PSU that I'm converting into a 12v, 5v power supply. I also have a group of 4 USB ports from an old computer that I connected to the 5v line of the ATX PSU. Unfortunately, the USB ...
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Intermittent USB Enumeration

I have a FS USB-powered device I'm working with. We have multiple different devices that all use the same USB circuitry, but for some reason on the latest build (700 pieces) of a particular device we'...
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Limit inrush current for USB and large capacitors

I am building an ESP32 custom board (project link and full schematics/layout.) I want to add USB to it for programming only. Power Supply: USB to serial: During normal operation, the board will be ...
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Are USB cables active circuits?

I always assumed a USB cable between two devices is just a collection of wires. I recently saw some pictures when shopping for cables indicating they have internal circuitry. Could someone clarify if ...
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USB Device Intermittent Disconnects

I have Xilinx Eval Board(SP605) with USB-UART bridge(SI CP210x). The board is connected to Win10 Computer USB port. The USB communication is failing intermittently when running tests. Observation so ...
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Female micro USB with 3.3V USB webcam

I have taken a 3.3V webcam out of an old laptop and have tried to get it to run on USB with a different computer. My first attempt of cutting off the end of a USB phone charging cable and soldering ...
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Can a device distinguish between USB HDD and flash drive?

I have a smart TV (LG C1) that can "pause" live TV, but demands a USB HDD attached. It will refuse a brand new USB 3.2 flash drive, but will happily use a 2014 mediocre HDD on USB 3.0. I ...
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2 votes
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Why does the ESP32 DevKit has a green box?

I am trying to copy the ESP32 DevKit behavior in my own PCB (my pcb project). I want that the ESP is powered from USB when plugged (for programming purpose only), but then powered by my external PSU ...
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2 votes
2 answers
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USB C Mod not working with high wattage PD cables

I made a USB C mod for my calculator. I wired all the Vbus, ground, D+, and D- pins to the corresponding mini B traces. Also did the 5.1K resistor as a pd from CC to ground so that USB C to C would ...
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Problems turning USB-A mouse dongle to USB-C

today I was trying to turn my old USB-A mouse receiver to an USB-C mouse receiver. I was using an USB-C plug of an old broken USB-C to USB-A/Ethernet-Adapter (similar to the one in the picture), it ...
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1 vote
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STM32 USB Mass Storage on External OSPI Flash

Hardware Target: I am using the STM32L4R9IDISCOVERY board Achievement 1: Building a little-fs file system, reading & writing files in the OSPI Flash memory with these functions: ...
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Do I need to switch power and ground on USB 3.0?

I am an electronics novice, so before I start cutting my cable, I want to ask people who know more than me. I have a project that has a USB 3.0 hub inside, and I want a single switch to handle the DC ...
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UVC FIFO master interface

I have to interface OV7670 camera module (without an external memory like AL422 for now) to a UVC USB chip FT602Q in 245 synchronous FIFO mode for my webcam project prototype. I followed some ...
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Questions about USB system architecure

I am reading about USB system architecture. A couple of things are not quite clear from the description on the Internet. Is the USB controller on the host called "host controller"? Are PHY ...
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Developed USB device not recognized on Windows/Linux - device descriptor error - RTL2832 dev board

I am developing a hardware where I would like to use an SDR circuit (RTL2832). However on the first prototype the circuit does not work. It has a USB interface however when I connect it to PC the ...
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Streams supported or not?

I'm reading documentation about this component: https://www.microchip.com/en-us/product/LAN7800 . It is a Ethernet to USB 3.0 Bridge. In a documentation point appears this: The USB functionality ...
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Trying to identify an (OEM?) analogue video USB capture board with <GsubR> logo

I am trying to diagnose a scientific instrument with a USB bus fault. It has a built-in analogue video camera which produces a CVBS output. This drives the small double-sided header board I am trying ...
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1 vote
2 answers
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USB C host and peripheral at the same time [closed]

Can a Dual-Role USB C port (e.g. on a smartphone) be used in both roles at the same time? So can it e.g. be connected to a PC and a keyboard at the same time?
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Implementing a USB hub with MITM (packet interception) capabilities

I'm working on a project in which I essentially need to implement a USB hub that also contains an embedded Linux SoC that would man-in-the-middle the connection between an upstream USB host and a ...
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-1 votes
1 answer
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How does PC install drivers and device info? [closed]

Can someone please explain how a PC knows all the info of a device as soon as you plug it in? How can I add this functionality to a bluetooth or USB device?
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Protection and filter on USB Power Lane device

Struggling finding good information, I would like to know which protections should be on a USB device ? The device is custom battery charger pcb (using MP2607 from MPS) which should be plugged on AC ...
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Designing a product with USB Host and Device mode and connectors

I'm the product manager for a line where we are going to develop a new version that supports USB devices. So the product will act as a host via USB 2.0. However, the same product also needs to be ...
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USB-C Dual Role Data and Alternate Mode

I have a question about USB-C - USB 3.0 Design. I have asked to some manufacturers (Renesas, Texas Instruments) if their PCIE to USB controllers support Dual Role Data but they told to me that that ...
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USB3320 REFCLK Pin

I'm looking at the Zybo USB OTG Schematic and the USB3320 datasheet. I noticed that USB3320's REFCLK pin is not connected. I read in the datasheet that the refclk pin needs to be connected to the ...
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How to hard-wire CC and CC2 pins for a hard-wired device?

I am designing a board with a Microchip USB7252 hub IC and a superspeed device. The superspeed device is wired directly into Port 1 of the USB7252. Port 1 is designed to be wired to a Type-C connector,...
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Vbus led doesn't turn off after disconnecting USB cable

I designed a circuit based on FT232XS (USB bus powered configuration). I placed red Led on vbus, when I disconnect the usb cable the led doesn't completely turn off and (tx, rx) leds start slightly ...
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USB C splitter with two charge for 2 usb monitors

I have a laptop with 2 USB C ports only. I want to be able to continue charging the laptop via one of the USB C ports and then use the remaining USB C port to split two directions, so that it provides ...
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Problem with data transfer using USB power lines (so no data lines)

I am using a Omnidots SWARM vibration sensor to measure vibrations on construction sides, works fine but I do need a battery from Omnidots in order to make it work off-grid and those batteries are ...
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Is there a default state of a configurable IC?

I am making a USB hub and the controller chip is configurable, but i am wondering if the hub can work without configuration, if I can put a bunch of no connect flags on half the pins. Here is the ...
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USB C PD source not powering simple USB 2.0 sink

I made a simple PCB that I wanted to be powered through a USB C connector with low current requirements (~50mA). I spent some time reading through the USB C Spec as well as reading other relevant ...
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USB data on Pi Zero not working after extending the USB data lines on it to another board

So, for my project, I took a Raspberry Pi Zero, which is to be put in an enclosure. When placed in the enclosure, the micro USB connectors on the Pi Zero cannot be accessed. Hence I took the USB data ...
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Battery charging from USB and max current

I'm designing a wearable device, which is powered by a lipo battery. It can consume up to 100 mA, with 2A short peaks. The battery needs 360mA for charging. Charging IC with power path is used. And ...
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