Questions tagged [usb-hub]

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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 ...
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1answer
41 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 ...
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26 views

How can I connect multiple modules/devices to one single usb port

Currently I have one GSM IOT-GA6 module connected to my laptop using a CP2102 usb adapter. Currently im able to communicate with the device sending AT commands using ...
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2answers
66 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 ...
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33 views

Can a USB 3.0 and a USB 2.0 be connected on to the same USB 3.0 port (without using a hub)? [duplicate]

I wanted to know if two separate devices (USB 2.0 and USB 3.0) can be connected to the Same port of a USB 3.0 host without using a hub, just by splitting the signal wires? To elaborate more, can I can ...
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20 views

How do I design a circuit with overload and shortcircuit protection for a multi-usb type c powered hub only?

I am planning on getting a number of raspberry pi 4, for now we will say room for 5. They have usb type c connectors on them, and can receive 5v at 5 amps. Therefore the total amps is 5 ports * 5a ...
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3answers
86 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 ...
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1answer
33 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 ...
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1answer
82 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 ...
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1answer
84 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 ...
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1answer
63 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 ...
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1answer
138 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
453 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 ...
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1answer
61 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 ...
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1answer
56 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 ...
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2answers
60 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 ...
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2answers
204 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, ...
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2answers
61 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,...
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2answers
82 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 ...
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3answers
535 views

How critical is PCB layout for USB Full-Speed?

I have designed a custom USB hub PCB with a TI TUSB2046(USB Full-Spped hub). Considering 12Mbps data rate, how critical are the layout constraints for the USB data lines? I did not follow the exact ...
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2answers
152 views

What happens when devices request different voltages from a USB hub? [duplicate]

I'd like to charge two devices with one USB charger, one requests 5V, the other 9V. I plug an USB hub (potentially an old USB 2.0 one) in the (9V capable) charger and plug the two devices in the hub. ...
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1answer
113 views

Modifying USB 2.0 Hub to use an upstream Type C connector won't communicate Data

I have taken a cheap Amazon Basics USB 2.0 Hub and have started soldering wires on it with a USB C plug breakout I bought from Pololu I soldered the Vbus, Gnd, D+ and D- respectively from the USB C ...
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3answers
72 views

Does a plugged in 12v usb-charger use energy when no device is connected?

I hard-wired a 12v cigarette-plug into my a-pillar. The whole point is to have an additional phone charger on the leftside where my phone mostly sits. I connected it directly to the battery ( with a ...
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1answer
123 views

USB hub and upstream/downstream speeds

I am designing a USB hub that has a 2.0 upstream connection (pc is only 2.0). To one of the downstream ports I am connecting a Ethernet to USB IC capable of USB3.0 speed and Gb ethernet. My question ...
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2answers
713 views

USB hub circuit

I have a custom made USB hub with 4 USB ports. It gets 5V max 500mA. Below is the datasheet for the hub chip http://minipcsale.ru/images/Minix-Neo-X8-h/GL852G.pdf now my question is If i connect 4 ...
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1answer
207 views

LAN9500A Ethernet Adapter

I'm designing a USB-to-Ethernet adapter (actually a prototype of a piece of a larger board). As those following my questions will know, I've had some ups and downs getting the USB part working, but ...
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1answer
52 views

Why is it so hard to find a Thunderbolt 3 to USB 3.0 hub online? [closed]

I want an extra USB terminal on my macbook and thought this would be a good opportunity to use my my never touched thunderbolt port. So i searched on ebay for a Thunderbolt 3 to USB 3.0 female. ...
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1answer
163 views

TUSB2046B signalling but not enumerated

Following on from my previous questions, I'm still trying to get this USB hub to work. My circuit now looks like this: Note that this is only providing USB access to other on-board devices and so I'...
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1answer
106 views

TUSB2046B crystal not oscillating

Further to my previous question, I also noticed that the crystal there was a 12MHz where this should have been 6MHz (due to an inventory error - the wrong part was fitted). I've removed the 12MHz ...
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3answers
3k views

What is the difference between usb root hub and usb host controller?

From the oracle wiki (usb controller): The USB host controller has an embedded hub called the root hub. The ports that are visible at the system's back panel are the ports of the root hub. ...
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3answers
550 views

How do USB hubs work when same device is connected

I was reading on how USB hubs work and since there is only 1 master, master sends a command to an endpoint. However, how does a USB hub work when there are 2 same devices plugged into a USB hub? How ...
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1answer
478 views

USB chokes for USB power

We are designing a ultra low noise USB 2.0 hub. I am thinking to add a common mode choke to + and - of the USB connector, in addition to the D+ and D- choke to remove the common mode noise. I am ...
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1answer
196 views

Would a microcontroller USB hub allow packet interception?

I am designing a packet interceptor that will allow pass through of a USB barcode scanner to the host unless the packet matches a certain format. Think USB keylogger but instead of copying the sent ...
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1answer
87 views

USB Diff Pair used by 2 devices on PCB

My PMIC uses the DP/DN pair of USB type C to get the maximum current that it can draw to power up the circuit or charge the battery. The problem is that i don't have a hub and the signal from ...
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2answers
135 views

USB2512 - Too low input voltage in datasheet

I have two USB2512BI-AEZG(datasheet) ICs and would like to drive them using only one external crystal for well known reasons. What is misleading me is ultra low input low voltage specified in the ...
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1answer
1k views

How can I add additional components and connections to make this USB hub functional?

I started designing a simple 4 port USB hub based around the FE1.1S IC. Using the datasheet, I managed to connect connections to almost all the pins... but there are some that confuse me. Schematic ...
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3answers
9k views

Can I Build My Own USB Hub? [closed]

Would it be possible to make a USB Hub from scratch? Like, designing a PCB, and hand soldering components on to it? What microchip would I have to use as the controller? Is there a simple controller ...
1
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1answer
423 views

Choosing an SMD Resettable fuse for a 2.5 Ampere USB charger port

So I have googled for more than an hour, trying to find the specific answer for this, and maybe Im searching all wrong, but here comes my question. I have a USB-hub combined with one fast charging ...
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1answer
91 views

USB HUB not responding

In my design I am using a USB2517i USB 2.0 Hi-Speed 7-Port Hub Controller and I am following the microchip reference schematic with the default settings. I am trying to interface the USB hub with ...
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1answer
314 views

Are USB 2.0 hubs required to disable downstream VBUS when upstream VBUS is removed

I'm using a Microchip USB2517 7-port USB hub in a self-powered application, and I'm interested in the behaviour of the device if the upstream VBUS detect signal is removed. I'd like to know if the ...
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2answers
372 views

How do I do to solder the adapter in the port and still use the same usb port without ruining the notebook? [closed]

I have a laptop that the wireless network card does not work, but I do not want to use my usb input for putting an external adapter, my idea is to open the laptop and solder the adapter inside the ...
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2answers
995 views

Designing a USB switch, schematic done, wanting a second opinion

I want to design a prioritized reverse USB hub, where a USB flash drive is connected by default to a device but switches to another when a connection is present. The setup of my product uses a ...
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2answers
142 views

Can i use 3 usb cables connected to a multi port charger to produce 15v DC ? is it safe? [closed]

I also want to know if the standard usb cable can handle such voltage or current..
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1answer
527 views

USB 3.0 RX&TX Connection

Sorry for the inexperience. This will be quick. I have two Texas Instrument ICs, one is a device, the other is a hub. I'm looking at a USB 3.0 device that has the TX and RX lines. When connecting ...
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2answers
565 views

My USB D+ and D- signals have what looks like a clock signal embedded onto it. The chip is a ISP1362

I am trying to load a firmware up-rev to a device with a USB stick. It doesn't see the stick. My USB D+ and D- signals have what looks like a clock signal embedded onto them. The chip is an ISP1362 ...
5
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4answers
3k views

Properly route through hole USB-C

I'm having major problems making a good layout with a through hole USB-C connector. Have anyone done a good layout for one? The best I have managed now looks pretty terrible and one of the ...
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1answer
291 views

Which diode to choose to prevent molex PC PSU powered HUB to be damaged or backfeed

I want to power my cheap, powered USB 2.0 7-port HUB via standard PC PSU (build molex to barrell adaptor). I want to make sure it's not backfeeding into computer. I want to be able to power the hub ...
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1answer
209 views

What is the effect of remapping ports on a USB hub

I'm using the USB2517 for a project. It's a seven port hub, and I'm using six of them. I'm working through the config settings, and I'm stumped by the port remap registers. The datasheet gives the ...
11
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1answer
3k views

USB 3.0 Hub shield connection

This is about the seemingly controversial shield to ground connection. The system is basically a body-worn intel-based computer, powered by a battery. Two USB 3.0 (or 3.1 Gen1) cables come out to a ...
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2answers
220 views

Parallel wall-charging USB-mini devices

I have 20 identical devices (GPS trackers- QStarz BT-1300ST) which are charged by mini-USB cables. I have no need for data transfer, which is done by bluetooth. I have bought two USB hubs that are ...