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Saelig's dongle offers easy USB-to-I2C connection

The IOW24-DG provides handshaking via clock stretching and a programmable timeout function.

-- Test & Measurement World, 11/17/2009 7:00:00 AM

You can use the IOW24-DG dongle from Saelig to quickly and easily connect I2C devices via a USB port. Based on the IO-Warrior 24 I/O controller chip from Code Mercenaries, the dongle comprises an assembled and tested PC board, a four-wire cable, and a two-part snap-fit dongle case. The cable can be soldered to the dongle PC board, providing flexible pinouts to fit your application.

The I2C master interface of the IOW24-DG operates at 100 kHz and allows a throughput of up to 750 bytes/s. In addition, the IOW24-DG provides handshaking via clock stretching and a programmable timeout function to prevent the dongle from hanging up due to malfunctioning slave devices. A special mode to communicate with Sensirion humidity sensors is also available.

Both 3.3-V and 5-V outputs can be used to power small external circuits. To allow compatibility with 3.3-V slaves, internal pull-up resistors can be switched off under software control. The dongle PC board has solder pads for pull-up resistors and protection diodes to 3.3 V.

The mechanical dimensions of the IOW24-DG are within the limits for use with a standard USB plug. This prevents the dongle from blocking adjacent ports and allows multiple dongles to be used on a single computer or USB hub. Since the dongle employs the IO-Warrior 24 chip, it is compatible with IO-Warrior software and development tools, as well as Linux, MacOS, and Windows. No specific drivers are required.

The IOW24-DG dongle costs $39. OEM versions, including customized cabling, are also available.

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