The National Instruments USB-8451 I²C/SPI Interface Device is a versatile, bus-powered solution designed for robust communication with integrated circuits, peripheral interface devices, and System Management Busses. Offering eight independently configurable digital I/O lines, the USB-8451 provides flexibility for various applications such as I²C device configuration and LED toggling, making it ideal for consumer electronics development.

This compact interface device features a USB series B receptacle and dual 16-position screw terminal plug headers for connectivity. Its proximity to I²C/SPI devices helps mitigate noise issues, enhancing reliability in communication. The USB-8451 operates without the need for an external power source, drawing power through its full-speed USB interface, which supplies up to 80 mA with a maximum of 500 mA, ensuring easy portability and installation.

Incorporated protective measures safeguard against overcurrent, overvoltage, and undervoltage conditions on SPI and digital I/O signals. The device supports four SPI modes and an advanced API for executing custom I²C and SPI transactions. Designed for indoor use, the operational temperature range is 0 °C to 45 °C, while it can be stored between -40 °C and 85 °C. The device measures 2.50 in. × 3.35 in. × 0.91 in. (6.35 cm × 8.51 cm × 2.31 cm) without connectors and weighs 3 oz (84 g).

The USB-8451 has transitioned to the Maintenance product life cycle phase as of March 31, 2022, yet remains available for repair and purchase through Apex Waves. For detailed specifications and to request a quote, please contact a sales representative.