Questions tagged [usb-hub]

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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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1answer
42 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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35 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 ...
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3answers
91 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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1answer
78 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 ...
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1answer
85 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 ...
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2answers
65 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
40 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
103 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 ...
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1answer
118 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 ...
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1answer
42 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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1answer
190 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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1answer
37 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
48 views

Separate powering for USB

I have a 7-port self-powered USB 2.0 hub and I want to use but I want to feed power from another source so that I can give all connected devices 500mA of power. I also want to have a switch for each ...
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70 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 ...
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1answer
62 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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0answers
31 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
108 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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3answers
155 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
47 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
89 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
120 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
77 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
150 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
852 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
433 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
80 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
69 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
212 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
71 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
179 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
1k 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
218 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
225 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
197 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
169 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
1k 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
308 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
59 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
213 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
139 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
5k 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
748 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
654 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
92 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
143 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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2answers
3k 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
12k 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 ...
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1answer
556 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
105 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 ...