The CSR USB-SPI Converter Windows Driver is a driver package for enabling communication between a Windows computer and a device that uses the CSR USB-SPI (Serial Peripheral Interface) converter hardware. CSR (Cambridge Silicon Radio) is known for making Bluetooth and wireless chipsets, but they also manufacture USB-to-SPI converters that allow devices with SPI communication to connect to a PC via USB.

When you connect a CSR USB-SPI converter to your computer, you need a proper driver so that the operating system can recognize the device and facilitate communication with the hardware using SPI protocol.