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+5V
gnd
G2
load
load
G1
GND
GND
Note: load must be 250 ohms minimum
Figure 2-3Using the General Purpose Outputs
If the device which is being driven by a GPO requires a relatively high current (such as a relay) it must have
an internal resistance greater than 250 ohms, or must be current limited to 20 mA by means of a suitable
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) to absorb any generated back electro-motive force (EMF).
10 - 100 uF
G2
+
Relay
coil
GND
1N4001
Figure 2-4 Clamping a Relay
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