USB power to external device

On Sat, 17 Feb 2007 08:15:28 +1100, in comp.arch.embedded Don McKenzie
<look@mysig.com> wrote:

>martin griffith wrote:
>
>> Not sure if this is the right place , but:
>> 
>> I need to power some analogue stuff from a USB port, and AFAIU the USB
>> on the PC/MAC will limit the current available to 100mA on connect. I
>> think I will need about 200mA, so how do I "simply" inform the source
>> to let me have it?
>
>Have a look at:
>http://www.dontronics-shop.com/product.php?productid=16456
>100ma
>and
>http://www.dontronics-shop.com/product.php?productid=16141
>500ma, 5V, 3.3V, and USB RX and TX at TTL levels if you need them.
>
>May be an overkill for what you want, may not be, but at least an 
>alternative.
>
>Don...
thanks Don, and your KIT123  is still working :-)
had a couple of vino's, so I read it in the am
anyway, done some diging and found

http://www.obdev.at/products/avrusb/index.html

might be something in it for you?


martin

martin griffith wrote:

>>>I need to power some analogue stuff from a USB port, and AFAIU the USB
>>>on the PC/MAC will limit the current available to 100mA on connect. I
>>>think I will need about 200mA, so how do I "simply" inform the source
>>>to let me have it?

>>Have a look at:
>>http://www.dontronics-shop.com/product.php?productid=16456
>>100ma
>>and
>>http://www.dontronics-shop.com/product.php?productid=16141
>>500ma, 5V, 3.3V, and USB RX and TX at TTL levels if you need them.

>>May be an overkill for what you want, may not be, but at least an 
>>alternative.

>>Don...

> thanks Don, and your KIT123  is still working :-)
> had a couple of vino's, so I read it in the am
> anyway, done some diging and found

Thanks for the good feed back Martin.

> http://www.obdev.at/products/avrusb/index.html
> might be something in it for you?

I'll have a good read of it shortly also.

I do have a couple of alternatives here as well:

15-Feb-2007
The FTDI VDIP1 module is an MCU to USB host controller development 
module for the VNC1L device.  VDIP1 is supplied on a PCB designed to fit 
a 24-pin DIP socket and provides access to all UART, SPI and FIFO 
interface pins of the VNC1L device.
http://www.dontronics-shop.com/product.php?productid=16621

15-Feb-2007
The FTDI VNC1L USB Host Controller ICs not only handle the USB Host 
Interface, and data transfer functions but owing to the inbuilt 8/32-bit 
MCU and embedded Flash memory, VNC1L encapsulates the USB device classes 
as well.  When interfacing to mass storage devices such as USB Flash 
drives, VNC1L also transparently handles the FAT file structure 
communicating via UART, SPI or parallel FIFO interfaces via a simple to 
implement command set.
http://www.dontronics-shop.com/product.php?productid=16620

Don...

-- 
Don McKenzie
E-Mail Contact Page:               http://www.dontronics.com/e-mail.html

Crystal clear, super bright OLED LCD (128x128) for your microcontroller.
Simple serial RX/TX interface. Many memory sizes.
http://www.dontronics-shop.com/product.php?productid=16460

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