Products
Adapter for communicating to I2C, SPI and serial buses from a USB port. Output pins may alternatively be configured as general purpose digital input/output and analog inputs.
$21
Devantech self-powered USB to RS485 adapter with support for baud rates up to 250kbps, automatic bus turn-around, and buses up to 128 devices.
$27
Cross-platform USB to I2C interface adapter to connect any 100kHz I2C device or bus to a host PC.
$25