Matrix Orbital LCD0821 - Manual (Page 12)

8
4.2 Common Features
General Purpose Outputs
Figure 8: GPO Header
Table 6: GPO Pinout
Pin Function
1 GPO
2 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.