Matrix-orbital LCD2041 Legacy User Manual download pdf (Page 13)

LCD2041 rev 2

GPO

240 ohm

resistor

Jumper

Figure 2-10 Bypassing 240 ohm resistor

Note: The GPOs do not have any over current or over/under voltage protection so care must be taken when

using them. For instance if the external device is a relay it must be fully clamped (using a diode and

capacitor – see Figure 2-11) to absorb any generated back electro-motive force (EMF).

10 - 10 0 u F

1N400 1

Re lay

coil

GPO

Figure 2-11 Clamping a Relay

1 2 ... 8 9 10 11 12 13 14 15 16 17 18 ... 29 30

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Matrix-orbital LCD2041 Legacy User Manual Page 13