QSG-8429 Datasheet, PDF (2/19 Pages) Holt Integrated Circuits – HI‐8429 Eight Sensor Array with Ground/Open or Supply/Open and SPI interface.

INTRODUCTION
This board demonstrates the features of the HI‐8429 eight input discrete sensor IC. 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 are set by writing to the four on chip
DACs. Note in this document the references made to Airbus sensor levels are referring to the levels
specified in the Airbus specification ABD0100H. This EVM (Evaluation Module) contains a 16 bit,
Freescale MC9S12XDT512 MCU, this is used to interface to a terminal emulator and control the HI‐8429.
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 is shown in the picture below; two HI‐8429 devices are 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.
This guide summarizes how to set up and get running quickly. Additional support material is provided
on CD‐ROM
QSG‐8429 Rev. New
HOLT INTEGRATED CIRCUITS
2
Oct 2014