The Holt HI-8429 Evaluation Board demonstrates the features of the HI-8429, an 8-channel Ground/Open or 28V/Open discrete-to-digital sensor IC with SPI interface. The HI-8429 is powered from 3.3V ± 5% VLOGIC and 12 to 16.5V VDD supply voltages. The device is configured and sensor data read by the SPI serial bus. Sensor input thresholds and hysteresis are programmed via the SPI bus by writing to the four on-chip DACs. The EVM (Evaluation Module) contains a 16-bit, Freescale MC9S12XDT512 MCU, which is used to interface to a terminal emulator and control the device.
The Holt CD, included with the evaluation kit, contains example source code, providing an easy path for the customer to develop their own control software. 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 Tera Term. The HI-8429 Evaluation Board has two HI-8429 devices mounted on the board so the customer can evaluate SPI daisy chain operation. A bank of LEDs monitors the outputs on either bank of eight sensors.