Questions tagged [usb-hub]

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USB2514B not working properly

i'm using the USB2514B to create a 1 to 4 usb hub with some other relays. The problem is that when any device is connected, windows shows the "USB Device not recognized" error. When using ...
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1 answer
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Splitting a USB-C for aux power

I'm building a mechanical keyboard and I need more current from my PC than I can get from one usb port. Can buy/make a usb splitter that I can plug into two A ports on my PC and plug into my USB-C MCU?...
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2 votes
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How do I connect USB Type-C signals to a USB Type-A connector?

I am designing a USB hub circuit by using USB7002. It gives out two USB 3.2 Gen 1 ports with Type-C support. Each of these two ports has two pairs of RX and TX differential pairs (SS-RXA, SS-RXB, SS-...
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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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  • 533
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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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  • 533
2 votes
1 answer
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USB Power Inside of Freezer / Fridge [closed]

Background of the project: I am doing my own DIY Keezer (keg freezer) which basically turns a chest freezer into a fridge that will hold kegs with the assistance of a temperature controller. The ...
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Crafting a Superspeed USB Type-C port out of two ports on a USB 3 hub?

I am designing a “simple” USB-C Hub, that will have two downstream facing USB-C ports (and nothing else), both supporting USB 3 speeds. I have solved some of the challenges already- VCONN, power ...
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1 vote
2 answers
42 views

Replacing USB251xB/xBI USB 2.0 HUB Controller

Due to Chip Shortage problem, I need to replace Microchip USB251xB/xBi USB 2.0 Hi-Speed Hub Controller with USB3503T-I/ML I'm using only two USB 2.0 ports. the chip will be used in an Industrial ...
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  • 533
2 votes
3 answers
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VF vs. VFR Suffix: Whats the Difference?

On Digikey, I have found 2 parts that have the same datasheet and same product attributes, but one is $2 cheaper and has VFR at the end of its name instead of VF. Here are the products and datasheets: ...
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1 vote
1 answer
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Does USB have some kind of current cutter that cuts the current for safety? [closed]

I accidentally got 24V into the GND on my Arduino and then the USB shut off - but not all of them. When I restarted my computer, then all USB shut off and they are not giving out any current. Notice ...
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Wiring to connect three USB 3A receptacles (to connect my laptop to an active usb hub from one of two locations)

I'm a total noob in electronics ) I am trying to solder three USB 3A receptacles in a way that would allow me to connect my laptop to my active USB hub from either of two locations (there will be only ...
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4 votes
2 answers
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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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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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2 votes
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Is this USB Hub 3.0+2.0 hybrid safe to use?

So I just bought a USB 3.0+2.0 hub hybrid. When I check the PCB, the pin out is new to me (see photo). From host, two of the USB 2.0 data lines (red lines) went straight to the hub IC, then from the ...
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1 answer
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USB hub IC overcurrent Pin: active LOW or active HIGH?

I am using USB2517 - USB 2.0 Hi-Speed 7-Port Hub Controller IC to make a USB 2.0 hub. What I do not understand (or its missing from the IC's datasheet), is Pins OCS[7:1]_N, which are "Input from ...
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-1 votes
2 answers
158 views

Use USB D-/D+ only on USB 3.0 IC

I want to design a USB hub 3.0 with only D- and D+ data pins (So I wont implement the USB 3 functionality). I chose CYUSB3328 IC for this job. (The reason I do not use a USB 2.0 for this, is because I ...
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1 answer
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USB7216 hub: where to connect "VCORE" power

I am trying to make my own USB hub using USB7216 IC, and trying to understand how should I power the 'VCORE' pin. Based on the datasheet, it should receive a ~1.15V power: Page 42: Page 44: But it ...
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0 votes
1 answer
51 views

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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6 votes
3 answers
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Why might some video not go through a USB hub?

I'm having a strange problem with a USB Hub. I'm using a Microchip USB7206 evaluation kit. I have two camera boards. The first is a Leopard Imaging stereo camera board, which uses an OV00580 image ...
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USB2514B usb hub circuit with powered upstream device

I am designing a board that contains a USB hub IC which the upstream port connected to an Android mobile device, and the downstream ports connected to various other ICs or external devices. The board ...
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0 votes
1 answer
73 views

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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How does a USB-C dock work? What is the difference between an expensive dock and a cheap USB hub

So I notice that cheap $20 USB-c hubs (no power supply) lower transfer speed for connected devices. This isn't surprising, after all my laptop only have 1 lane and now all the mouse, keyboards, ...
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-3 votes
1 answer
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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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1 vote
3 answers
77 views

What does filtered analog power mean in datasheet?

I am making a USB hub and found a controller chip on Digikey. In the datasheet, it says some of the pins need 3.3V filtered analog power. I then searched the datasheet and found nothing else giving ...
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2 answers
78 views

USB 3.0 Host with two devices on one line: a 2.0 hub and 3.0 port

Is it possible/sane to connect a USB 3.0 host controller's D+/D- pins via a USB 2.0 hub (to allow several downstream USB 2.0 ports) while connecting the USB 3.0 ss pins directly to a USB 3.0 connector ...
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USB 3.x to Ethernet then Ethernet back to USB 3.x IC a.k.a usb over ip

Hey all I’ve been looking around a lot for a company that has a type of USB 3.x over IP. The ones I only see are not ICs but full blown products. These products cost $250+ so I’m looking to see if I ...
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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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3 votes
1 answer
101 views

Why can't you make a thunderbolt 3 hub?

So laptops with thunderbolt 3 are pretty common, docks are common, every other kind of USB seems to be able to be used with a hub. I know thunderbolt 3 can be daisy chained, theoretically eliminating ...
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1 answer
131 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 ...
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1 answer
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Block current flow out of powered USB hub when supply is off

I have a custom computer setup with a standard 5V SMPS module powering many attached devices: an Ethernet hub, USB hubs, Raspberry Pis. (To eliminate the need for 6+ wall-warts) I have a basic eBay ...
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0 votes
2 answers
114 views

monitoring voltage and amperage on Raspberry Pi USB ports

Question: Is there a way to get the Pi to tell me the instantaneous voltage and amperage on the USB port that I could write to a data file? Why I am trying to do this: I am trying to monitor rapidly ...
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0 votes
1 answer
35 views

How do I determine my new power requirements when switching my peripheral to Raspberry Pi

Problem: I have just moved my camera array USB peripheral from a MacBook Pro to a Raspberry Pi 400, and the Pi can only see at most 19 of the 24 cameras that the MacBook Pro can see. I think this is ...
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1 answer
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Help on creating a USB Hub Switch that enables multiple computers to share USB device?

In the past year of working from home I grew tired of a ritual that I have to do every morning and every afternoon, the usb peripheral change. I have tried different solutions multiple keyboards/mices/...
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1 answer
275 views

Purpose of this IC in USB 3.0 Hub

I'm trying to design my own USB 3.0 hub based on this commercial design, I can understand everything in this design except the usage of IC "ASM1543". Unfortunately there is no datasheet ...
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USB 2.0 0.9A and Data (hub) Simultaneously

Trying to combine USB hub and higher-than-default USB charging currents. My experience with implementing USB is close to zero, although I usually have no problems with datasheets and other designs I ...
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1 answer
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USB splitter for a tablet

I have a tablet that has one USB-C exit. I need to connect power supply and USB to LAN adapter at the same moment. I have bought the only USB-C splitter I could get and it does not work (despite ...
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2 votes
3 answers
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Is 5.5V safe for USB storage devices?

I have a USB-A 3.0 hub with ten ports. I've owned it for about 2 years now without any issues, until recently. About a couple of months ago I had a flash drive plugged into one of the ports on the hub ...
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-1 votes
1 answer
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USB Type-C 10Gb mux, or hub IC [closed]

I am planning to create a PCB that takes the Type-C frontpanel header, with a speed of 10 Gbps and provides two USB Type-C ports from that one cable. The PCB will be a frontpanel mod. During my IC ...
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Need help troubleshooting connection between STM32F103 microcontroller and FE1.1S USB Hub

I'm working on an embedded system project, utilizing an STM32F103 microcontroller, and an FE1.1S USB hub. The STM32F103 fails connection to the FE1.1S USB hub (wired to port 4). Ports 1-3 work on the ...
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0 votes
1 answer
55 views

Understanding USB Descriptors speed

I have several USB devices that are capable of running High Speed 2.0 (480 Mbps) mode but runs Full Speed 1.1 (12 Mbps) instead. Take for example a USB DAC: It advertise USB 2.0 compliant and fall ...
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USB Product as both Host and Device without OTG

Can a product behave as a USB Host in one setup and as USB Device in another setup without having USB OTG capabilities? My intuition says that this is not possible, since if it was, there would not be ...
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0 votes
3 answers
823 views

Connecting 50 Arduino slave devices to a single master Raspberry PI

I am designing a automation system and need to have multiple slave devices(probabaly arduino UNO or NANO) communicating both ways with master device (Raspberry PI). There is a server and database ...
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1 answer
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What happens when a computer is plugged into another computer by USB? [closed]

I am just curious about what happens when you have a USB 2.0 cable with two male ports, and plug both the ends in two different computers (not for data transfer reason, or any other reason, just ...
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Noise with TPA3110D2 amplifier on the same power supply as an USB HUB

I have a TPA3110D2-based, XH-A232 amplifier board powered by a 12V switching supply (S-120W-12V). The input is the headphone output of a monitor connected to a PC. I would like to power an USB HUB ...
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1 vote
2 answers
187 views

Exceeding 5m for USB 2.0 Full Speed

USB 2.0 Full Speed (12Mbit/s) and USB 2.0 High Speed (480Mbit/s) are both specified as having a maximum cable length of 5m. Why does Full Speed not allow a longer cable length, given its much lower ...
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Bypass SuperSpeed USB3.1 lines around USB2.0 Hub

I found this document online, which shows an interesting USB routing topology that I have not seen before. The 4x superspeed lines go straight from the USB3 connector to the SuperSpeed IC, but the ...
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2 answers
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Are there any guidelines to injecting power at the USB 3 device side instead of having it powered from the host? Basically making it self powered?

I am trying to power two USB 3 cameras off 24V, so I can power a LED circuit at the same time, instead of 5V and basically put a 5V regulator at each camera side. I am wondering if there were a good ...
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1 answer
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DIY Powered USB Hub PCB

For my home project I need to connect multiple Arduino's to a Raspberry Pi. My raspberry pi controls everything in my house and the arduino's are going to be used to get sensor data. I want to ...
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1 vote
1 answer
107 views

Drive resistor value for crystal in USB hub

I am designing a one-up two-down USB hub based on a TUSB2036 USB FS hub. I am going to use a 6MHz crystal as recommended in their datasheet: The usage of the resistor doesn't really make sense to me ...
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2 votes
1 answer
589 views

USB2517 USB hub unable to enumerate

I've made a USB hub PCB using a USB2517 controller, but it's not working. When I plug it into the host computer, I get a "not recognised" message on Windows and "unable to enumerate" message on Linux. ...
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