Matrix-orbital LCD0821 User Manual download pdf (Page 12)

4.2 Common Features

General Purpose Outputs

Figure 8: GPO Header

Table 6: GPO Pinout

Function

GPO

Gnd

A unique feature of the LCD0821 is the ability to control relays* and other external devices using a single

General Purpose Output. It can source up to 10mA of current at five volts when on or sink 20mA at zero

volts when off. The two pin header can be interfaced to a number of female connectors to provide

control to any peripheral devices required.

*Note: If connecting a relay, be sure that it is fully clamped using a diode and capacitor in order to absorb any

electro-motive force (EMF) which will be generated.

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Matrix-orbital LCD0821 User Manual Page 12