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83 Threads found on Hub Usb
Hopefully someone with some expert usb knowledge can help me. I have a 4 port usb 2.0 hub that is using an Alcor AU6254 microcontroller. The 4 port hub is comprised of two boards -a Main board and a daisy chained secondary board. Two ports on each board. Each board has the same microncontroller. When certain HID devices (...)
Hi, Use an usb hub. Is there another option? Klaus
How do you have a four-port usb hub consolidate to one usb port and the computer knows which usb is talking to it at any given time? I think of like a keyboard (multiplexer?) but a friend says "Serial Communications", I accept to be wrong but why all the articles don't seem to actually explain how... just mentions things (...)
I use multiple external hard drives with my current laptop (3TB (3.5" usb External), 2TB(3.5" eSATA External), 1TB (2.5" 9.5mm tall usb hub Cooling Pad), and 1TB (2.5" 12.5mm tall usb HDD Shell). the 1TB (was unpowered) in the shell fell out of my hand while shifting my laptop, cooling pad, external hdd, and power cord (...)
Best to read what TI says about Port hub power and pay attention to the ESR*C values used on +5. Provisions to prevent excessive hub surge and also low ESR < 1 Ohm >>> * C value <100us
Hi, Document about enumeration. In short: usb power is always active. Usually there is only a polyfuse installed to limit the current to the device. (Never seen hubs with power switches or current sensors, but there may b
Reference designs are published by hub chip vendors. They usually rely on a 5V DC supply, so you need a small SMPS. Calculate 500 mA for each downstream port and about 300 mA for the hub, usually regulated down to 3.3V. I have used SMSC/Microchip usb2514 4-port hub some time ago.
The PIC32 will connect to the computer via usb CDC and Ethernet. The PIC32 can either act as an usb host or a device, either connect to the hub upstream port or to a PC usb port. In so far the intended topology isn't feasible. Embedded hosts may include hub support in it's list of targetted devices (...)
Unless you make a custom board based on the usb hub, you're not likely going to have much success making your hub "smart". The usb controller chip interface to the logic is where you want to check for what you are trying to do. Tapping into the usb connector signals will likely degrade the signaling on the (...)
usb specification requires short circuit strength of usb receivers, any usb data or power line against each other. In so far the hub shouldn't be damaged even if the device is controlled incorrectly. I think the most likely explanation is this: Your 12 pin connector misses the feature of power/ground connecting first but (...)
in my project i need usb hub controller with 2 port. I have seen TI's controller Tusb2036. but i m looking for alternative and controller also. so which usb hub controller is better than this.
Hello, as the title suggested, I am trying to add 2 ethernet interface and several usb port to my Rasp Pi, using LAN9512. Since this will be used in project and the client wanted me to make the device as small as possible, using already available usb hub and usb to ethernet is not possible. In fact, I did so for first (...)
Dear All I am looking for Free software that can use to check and monitor Enumeration process from the OS point of view ,when we connect usb device ( Ex: Pen drive ) to the usb hub under windows OS Thanks In advance
Hi, I need to interface lots of microcontrollers to a single Windows PC. How much - 100 pieces. All of them have UART, of course; but usb is not available. I was wondering if I can use 11 usb hubs, each with 10 output ports connected in daisy chain. PC | 1to10 usb hub | 10x 1to10usb (...)
Hello, First I must say that I am pretty noob with electronics design, but I try to understand things best I can. I am having a hard time with one embedded system I trying to get to work. Problem relates to usb which is used as communication infrastructure. There is a host device that has several PIC based devices connected via usb (...)
The question isn't very specific. "transmit its output to a software using wi-fi" sounds like the job of a basic wifi-to-usb hub which can be better purchased from the shelf.
Hi I'm new to the board and in need of some help. Im an amature astrophotographer and dealing with 12v and 120v power sources. I need to keep my equipment using 12v's an not rely on a 12v to `120v converters these was battery life which I need the most. The equipment I am questioning is fairly easy but my knowledge is none. I need to power my usb h
Trying to use PLX usb controller NE2282 PCI-3.0 Interface. This IC supports only one port. How do I design for connecting two downstream ports. Should I use a separate 2 port hub controller say from SMSC and connect it to NET2282?
usb hub usb2514 - implementation doubt I'm using usb2514 to design a BUS powered system which has 3 devices to be connected at present . My doubt is regarding the SUSP_IND/LOCAL_PWR/NON_REM0 pin . My system is bus powered so the pin has to be LOW . The device on my port 1 is non removable so the pin has to be HIGH . (...)
Hello sir, In my project I am implementing 4port usb hub. Can anybody suggest me a cheaf and best ic for that?