Cheapest USB microcontroller?

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:

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

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

snipped-for-privacy@bytecraft.com Canada

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

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

Microchip has $2.12

If you only need low-speed USB, you can do it in software on an ATtiny:

Presumably this would let you shave a little off the MCU cost, but the USB implementation licensing might eat up that advantage.

--
   Wim Lewis , Seattle, WA, USA. PGP keyID 27F772C1