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Application Note of Watchdog Timer and DIO Function Library for Nuvo/Nuvis/POC Series
Copyright © 2013 Neousys Technology Inc. All Right Reserved. Page 8 of 38
Using DIO Function
Wiring for DIO
The digital input function of Nuvo series is implemented using a photo-coupler with a
internally series-connected 4.7kΩ resistor. You need to provide a voltage to specify the
logic high/low state. The input voltage for logic high is 5~24V, and the input voltage for logic
low is 0~1.5V.
The digital output function of Nuvo series is implemented using Power MOSFET +
Analog Device iCoupler® component. The DO channels are configured as NO
(normally-open) configuration. When you turn on system, all DO channels have a
deterministic state of logic 0 (circuit disconnected from GND return). When logic 1 is
specified, MOSFET is activated and GND return path is established. The digital output
function on Nuvo series supports sinking current connection. The following diagrams are
the suggested wiring for DO: