Questions tagged [usb-hub]

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1answer
44 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,...
6
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3answers
315 views

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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0answers
21 views

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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0answers
43 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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0answers
41 views

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, ...
-3
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1answer
77 views

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 ...
1
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3answers
72 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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2answers
54 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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0answers
49 views

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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0answers
46 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 ...
3
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1answer
89 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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1answer
87 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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1answer
44 views

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 ...
0
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2answers
63 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 ...
0
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1answer
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 ...
0
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1answer
54 views

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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1answer
155 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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0answers
34 views

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 ...
0
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1answer
63 views

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 ...
2
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3answers
294 views

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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1answer
110 views

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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1answer
195 views

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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1answer
50 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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0answers
41 views

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 ...
0
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3answers
565 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 ...
1
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1answer
102 views

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 ...
0
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1answer
118 views

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 ...
1
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2answers
131 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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2answers
74 views

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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2answers
220 views

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 ...
0
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1answer
318 views

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 ...
1
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1answer
75 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 ...
1
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1answer
402 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. ...
0
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1answer
64 views

USB IF specification for back powering Hubs

Is there any design specification in the USB forum that states what amount of back powering current from a device to a hub is allowed? I understand that it may be zero but I also can't seem to find ...
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0answers
140 views

USB hub upstream power backfeed

I'm designing a board that implements a USB hub. The upstream port will be connected to an Android tablet (or something like that) and the downstream ports will feed some other devices. The board ...
0
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1answer
87 views

Power output neccesary to power multiple USB devices at once?

If I have a device that requires 5V and 2A to function, what kind of power supply would I need to power 4 of these devices at the same time to their full capacity? Here is an example setup: Power ...
0
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2answers
327 views

Transistor for USB Hub power control

I'm trying to add power control to a USB hub based on the Terminus Tech FE1.1s hub chip. From the datasheet, I know the chip supports ganged power control, so all ports share a single switch. That's ...
0
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3answers
442 views

DYI USB Hub - It is possible to just connect ports in parallel?

I want to make device what is similar to KVM switch. I have mouse + keyboard connected to my table PC and I want to use it for my notebook as well. I decided to make USB HUB with 2 USB input (for ...
0
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1answer
63 views

USB3/2 hub cascading (reverse hierarchy)

I want to implement multiple USB ports using one USB3.0 and one USB2.0 hub with four ports each. The microprocessor I want to implement these ports for has just a single USB3.0 port left (of which the ...
0
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1answer
91 views

USB 3.0 hub confusion [closed]

For a while I thought I could distinguish between USB 2.0 and 3.0 (or 3.1 gen 1) standars from the hardware point of view. Now I am confused however, because I have noticed that my USB 3.0 hub has the ...
4
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1answer
295 views

Can I use the USB 2.0 and 3.x channels simultaneously in a USB 3.x port?

I am designing an FPGA development board for myself. I want a moderately high speed link (400-500MB/s) to the host PC and I'm considering several options, including an FTDI FT-60x bridge IC. The ...
0
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1answer
88 views

USB Port Amperage

So I have built a Benchtop Power Supply out of an old computer power supply to power and test misc. gadgets I have created. I would like to attach 2 salvaged USB ports from a junked computer to the 5v ...
0
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1answer
164 views

A rather big (28 ports) USB hub design consultation

I have to design a big USB-hub that only full- or low-speed USBs will be connected to the downstream ports. I've already made it with FE1.1 and four FE2.1. The first one converts 1 USB to 4 USBs, ...
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1answer
1k views

Can I cut off a USB C plug, and replace it with a USB C socket

I need a USB C (female) to USB 3.0 Micro B (male) cable. Unfortunately, I can only find a male - male cable. Is it possible to cut the USB C plug off, and solder the wires to something like this: Or ...
3
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1answer
614 views

Why does my bus-power-only USB hub enumerate as self-powered? [closed]

When I plug in a Sweex NPUS0480 4-port USB 2.0 hub, it is enumerated as self powered (according to the windows USBView application). However, it is in fact bus powered. There is no DC connector on ...
0
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1answer
96 views

Current limit a bus-powered usb 3.1 hub

I'm currently designing a bus-powered usb 3.1 hub. It will use a USB-C for UFP and 3 USB-A downstream. The hub will only be acting as a sink. As of my understanding, since it may be connected to USB ...
2
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2answers
89 views

USB 3.1 Gen 1 Transfer Speed Through Hub

If I have a USB Host Controller that supports USB 3.1 Gen 1 plugged into a hub, and 2 storage devices connected to the downstream ports, if I transfer data from one storage device to the other through ...
3
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2answers
228 views

Does the Microchip/SMSC PHYBoost technology help with Rx, or does it boost Tx only?

So I'm doing some configurations on a product which has a LAN9514 chip (datasheet), that features the "PHYBoost" technology. Microchip's website is very vague about the technology, and my impression, ...
0
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2answers
76 views

USB EC vs PIC MCU [closed]

I'm trying to make a peripheral with an embedded USB hub, which will include USB-C 3.1. As I've been researching USB I've found that Microchip has a whole slew of embedded controllers dedicated to USB,...
0
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2answers
277 views

USB 2 connection to USB 3

I want to design a chip level circuit to connect USB 3 port to several USB 2 devices. I think the best way is using a Hub like TUSB8041, TI 4 port hub USB 3. As far as I know, the USB 2 and 3 are ...