Reply by Wim Lewis ●July 26, 20082008-07-26
In article <3f388f3d-684e-40e0-907a-fbb1ae57f894@f36g2000hsa.googlegroups.com>,
Bob  <bob3635x@yahoo.com> wrote:

>Does anyone know the lowest cost microcontroller with a USB interface?
>
>I have done some Googling, and it seems there are quite a few USB
>microcontrollers based on either ARM or 8051.  Either is okay, but
>they are not very cheap.  They are all over $3 @ qty 1000.
>
>The cheapest I have found so far is the Atmel AT90USB82, which is
>an AVR.  It is just under $2 @ qty 1000.


If you only need low-speed USB, you can do it in software on
an ATtiny:
    http://www.obdev.at/products/avrusb/index.html
Presumably this would let you shave a little off the MCU cost, but the
USB implementation licensing might eat up that advantage.

-- 
   Wim Lewis <wiml@hhhh.org>, Seattle, WA, USA. PGP keyID 27F772C1
Reply by Neil ●July 23, 20082008-07-23
Bob wrote:

> Does anyone know the lowest cost microcontroller with a USB interface?
> 
> I have done some Googling, and it seems there are quite a few USB
> microcontrollers based on either ARM or 8051.  Either is okay, but
> they are not very cheap.  They are all over $3 @ qty 1000.
> 
> The cheapest I have found so far is the Atmel AT90USB82, which is
> an AVR.  It is just under $2 @ qty 1000.
> 
> Here is what I need:
> 
>    Essential:
>       USB (low or full speed)
>       Cheap
>       10 I/O  (8 outputs, 2 inputs)
>       >= 1k program memory
>       >= 256 bytes non-volatile data (eg EEPROM)
> 
>    Nice to have:
>       UART
>       Integrated Oscillator
>       Very low power sleep mode
>       Small package
> 
>    Not needed:
>       High-speed USB
>       Fast CPU
> 
> If anyone has any other suggestions, please let me know.
> 
>    -Bob

Microchip has $2.12
Reply by Antti ●July 22, 20082008-07-22
On 22 juuli, 09:32, Bob <bob36...@yahoo.com> wrote:

> Does anyone know the lowest cost microcontroller with a USB interface?
>
> I have done some Googling, and it seems there are quite a few USB
> microcontrollers based on either ARM or 8051. =A0Either is okay, but
> they are not very cheap. =A0They are all over $3 @ qty 1000.
>
> The cheapest I have found so far is the Atmel AT90USB82, which is
> an AVR. =A0It is just under $2 @ qty 1000.
>
> Here is what I need:
>
> =A0 =A0Essential:
> =A0 =A0 =A0 USB (low or full speed)
> =A0 =A0 =A0 Cheap
> =A0 =A0 =A0 10 I/O =A0(8 outputs, 2 inputs)
> =A0 =A0 =A0 >=3D 1k program memory
> =A0 =A0 =A0 >=3D 256 bytes non-volatile data (eg EEPROM)
>
> =A0 =A0Nice to have:
> =A0 =A0 =A0 UART
> =A0 =A0 =A0 Integrated Oscillator
> =A0 =A0 =A0 Very low power sleep mode
> =A0 =A0 =A0 Small package
>
> =A0 =A0Not needed:
> =A0 =A0 =A0 High-speed USB
> =A0 =A0 =A0 Fast CPU
>
> If anyone has any other suggestions, please let me know.
>
> =A0 =A0-Bob


there exist china made usb flash micros with 1.0 usd cost, but they
arent easy to get
1.84 is already not so bad

i did recall c8051f326 pricing 2.36 usd but digikey list a bit more so
you maybe cant get at 2.30
they are nice as they have onchip oscillator and run FS not LS like
the cypress cheap things
i also considered myself once the USB82 ,but eh the last penny is not
always worth saving
also if you need add crystal :(

so if you can use LS use the sub 2 usd cypress LS chip

Antti
Reply by rickman ●July 22, 20082008-07-22
Your need for EEPROM narrows the field considerably.  Flash is nearly
universal in MCUs, but EEPROM is much less common.  Is this actually
required?  Can it be added externally?  I expect it is a cost issue,
but you need to compare MCU with EEPROM cost vs. MCU + EEPROM cost.
You may be able to do better using a separate EEPROM.

Rick


On Jul 22, 2:32 am, Bob <bob36...@yahoo.com> wrote:

> Does anyone know the lowest cost microcontroller with a USB interface?
>
> I have done some Googling, and it seems there are quite a few USB
> microcontrollers based on either ARM or 8051.  Either is okay, but
> they are not very cheap.  They are all over $3 @ qty 1000.
>
> The cheapest I have found so far is the Atmel AT90USB82, which is
> an AVR.  It is just under $2 @ qty 1000.
>
> Here is what I need:
>
>    Essential:
>       USB (low or full speed)
>       Cheap
>       10 I/O  (8 outputs, 2 inputs)
>       >= 1k program memory
>       >= 256 bytes non-volatile data (eg EEPROM)
>
>    Nice to have:
>       UART
>       Integrated Oscillator
>       Very low power sleep mode
>       Small package
>
>    Not needed:
>       High-speed USB
>       Fast CPU
>
> If anyone has any other suggestions, please let me know.
>
>    -Bob
Reply by Walter Banks ●July 22, 20082008-07-22

Bob wrote:


> Does anyone know the lowest cost microcontroller with a USB interface?
>
> Here is what I need:
>
>    Essential:
>       USB (low or full speed)
>       Cheap
>       10 I/O  (8 outputs, 2 inputs)
>       >= 1k program memory
>       >= 256 bytes non-volatile data (eg EEPROM)
>
>    Nice to have:
>       UART
>       Integrated Oscillator
>       Very low power sleep mode
>       Small package
>
>    Not needed:
>       High-speed USB
>       Fast CPU
>
> If anyone has any other suggestions, please let me know.
>
>    -Bob


Depending on quantity Cypress M8A and M8B  parts
used in mice and keyboards. reasonable 8 Bit processor
and good reference designs. I am biased we wrote the C
compiler for the two parts families.



Regards,

--
Walter Banks
Byte Craft Limited
http://www.bytecraft.com
walter@bytecraft.com Canada
Reply by Frank Buss ●July 22, 20082008-07-22
Bob wrote:


> Does anyone know the lowest cost microcontroller with a USB interface?
> 
> I have done some Googling, and it seems there are quite a few USB
> microcontrollers based on either ARM or 8051.  Either is okay, but
> they are not very cheap.  They are all over $3 @ qty 1000.
> 
> The cheapest I have found so far is the Atmel AT90USB82, which is
> an AVR.  It is just under $2 @ qty 1000.
> 
> Here is what I need:
> 
>    Essential:
>       USB (low or full speed)
>       Cheap
>       10 I/O  (8 outputs, 2 inputs)
>       >= 1k program memory
>       >= 256 bytes non-volatile data (eg EEPROM)


You could take a look at your computer mouse. My Dell mouse has a
CY7C63813, which you can get for $1.84 for 410 units:

http://www.componentsuperstore.com/Store/ProductDetails.aspx?ProductIdentifier=CY7C63813SXCCYPRESS3700911

It doesn't have EEPROM, but you can re-program flash blocks from the
firmware. USB is low speed, only. It has 8k flash and 256 bytes RAM.

-- 
Frank Buss, fb@frank-buss.de
http://www.frank-buss.de, http://www.it4-systems.de
Reply by Bob ●July 22, 20082008-07-22
Does anyone know the lowest cost microcontroller with a USB interface?

I have done some Googling, and it seems there are quite a few USB
microcontrollers based on either ARM or 8051.  Either is okay, but
they are not very cheap.  They are all over $3 @ qty 1000.

The cheapest I have found so far is the Atmel AT90USB82, which is
an AVR.  It is just under $2 @ qty 1000.

Here is what I need:

   Essential:
      USB (low or full speed)
      Cheap
      10 I/O  (8 outputs, 2 inputs)
      >= 1k program memory
      >= 256 bytes non-volatile data (eg EEPROM)

   Nice to have:
      UART
      Integrated Oscillator
      Very low power sleep mode
      Small package

   Not needed:
      High-speed USB
      Fast CPU

If anyone has any other suggestions, please let me know.

   -Bob