The Holt HI-8437 Evaluation Board demonstrates the features of the HI-8437, a 32 channel discrete-to-digital sensor IC with SPI interface and high impedance inputs. The HI-8437 has a low threshold sensing capability, programmable in 100mV increments from 0.4V to 5.2V. The EVM (Evaluation Module) plugs into a Holt ‘General Purpose SPI Evaluation Board, based on a Freescale MC9S12XDT512 microcontroller motherboard. The motherboard MCU communicates with the HI-8437 via the SPI interface. Switches and LEDs help navigate the operating modes and confirm data and status information. A Serial UART output from the MCU provides debug and data messages to be sent to a PC using any terminal emulation program such as HyperTerminal. Example source code is provided with the kit, enabling the customer to develop their own control software.