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Questions tagged [usb-hub]

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0
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1answer
53 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
122 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, ...
1
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1answer
140 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 ...
0
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1answer
43 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
45 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
54 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
188 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
55 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
50 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 ...
1
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3answers
254 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 ...
0
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2answers
107 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. ...
1
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1answer
53 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
55 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 ...
1
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1answer
99 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 ...
0
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2answers
332 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 ...
1
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1answer
130 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
46 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. ...
1
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1answer
94 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'...
0
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1answer
78 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 ...
0
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3answers
1k 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. ...
0
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3answers
364 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 ...
0
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1answer
328 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 ...
0
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1answer
124 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 ...
1
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1answer
80 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 ...
0
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2answers
119 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 ...
-1
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1answer
671 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 ...
5
votes
3answers
6k 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
vote
1answer
347 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 ...
1
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1answer
84 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 ...
1
vote
1answer
228 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 ...
-2
votes
2answers
284 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 ...
0
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2answers
716 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
129 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..
0
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1answer
367 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 ...
0
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2answers
468 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
2k 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 ...
0
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1answer
229 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 ...
1
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1answer
168 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 ...
8
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1answer
2k 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 ...
1
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2answers
216 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 ...
0
votes
1answer
45 views

multiple peripherals though a single USB type C

I'm trying to build a TV set-up box composed of several peripherals such as: computer(raspberry compute module), wireless audio transmitter and a DSP each with various power requirements. I would ...
-1
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2answers
1k views

Homemade dual USB hub [duplicate]

Can I make a dual port USB HUB without a controller (parallel connection) it is only going to be used for a mouse and a keyboard. In other words will the Pc recognize them as 2 devices. Thanks
0
votes
1answer
337 views

Do I need USB isolator for laptop computer?

I have a product which is powered from main AC power. I need to serial communicate the product with a computer, for example sending some bytes to the product by the terminal program in the computer. I ...
2
votes
1answer
1k views

Wiring of USB 2.0 hub using a USB-C connector

I have a USB 2.0 hub with 7 ports and an external power supply. I wanted to replace the USB 2.0 connector with a USB type-C connector. That connector has the following documentation: I found the ...
0
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1answer
2k views

GL850G without over-current protection

i am using the GL850G in gang mode for a circuit without over current protection to extend my available USB ports. on power up the crystal starts oscillating for around 40ms then stops. then i using a ...
0
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1answer
219 views

Can faulty USB 3.0 device break USB 3.0 circuit in my computer? [closed]

can a faulty USB 3.0 hub with Ethernet port break USB 3.0 circuit in a laptop so that only USB 2.0 in those USB 3.0 ports works after that? Consider no device connected to the USB hub, only Ethernet ...
5
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1answer
1k views

What does the USB non-removable strap option actually change?

I am designing a device that uses a Microchip USB2412 2-port USB hub. The downstream ports of the hub are internally directly connected to other devices. Upstream is a removable USB B for power & ...
2
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1answer
596 views

Replacing a 5V female barrel connector on USB hub with female USB micro

Is it possible (and relatively easy) to replace a 5 V power plug (barrel connector) on a USB hub with a standard USB Micro power-only female? If so, is there anything special (besides hooking up the +...
0
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1answer
503 views

Is the self-powered USB hub powering my devices?

I bought a cheap Hub for powering my 5 arduino(s). It has an AC wall power adapter. Can i determine if it actually powers my USB devices and what amount of current per USB port can deliver? The USB ...
0
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3answers
87 views

How does current work in hubs?

Okay, I'm a total noob and don't know if I'm even wording this question correctly, but I'll try. My understanding is that the power supply (an USB power supply in my case) determines the current. I ...