Texas Instruments' LMP91050/51 design kit (consisting of the LMP91050/51 evaluation module, the SPIO-4 digital controller board, the Sensor AFE software, and the user’s guide) and the LMP91051 design kit (consisting of the LMP91051 evaluation Board, the SPIO-4 digital controller board, the Sensor AFE software, and this user’s guide) are designed to ease evaluation and design-in of Texas Instrument’s LMP91050/1 configurable AFE for Nondispersive Infrared (NDIR). Data capturing and evaluations are simplified by connecting the SPIO-4 digital controller board (SPIO-4 board) to a PC via USB and running the Sensor AFE software. The data capture board will generate the SPI signals to communicate to and capture data from the LMP91050/1. The user will also have the option to evaluate the LMP91050/1 without using the SPIO-4 board or the Sensor AFE software.