GETTING STARTED
1.3.2
General Purpose Input /Output connector
The General Purpose Inputs and Outputs are connected to the
picasso
TM
by a sub D-9 connector.
In Figure 5 you see a close-up of the sub D-9 connector. The pin connections are listed in
Table 3.
When you use the general-purpose inputs or outputs you have to connect an external 5 V power
supply. The maximum voltage is 5.5 V and the input current is 10 mA.
ATTENTION: The maximum output current is 100mA.
The outputs are open drain, which means that logic 1 will force the output to ground. A wiring
example to connect an output is given below.
ATTENTION: When the computer is turned off and the external power supply stays up the
output will also be forced to ground.
Sub D-9
Pins
Input 0
1
Input 1
2
Output 0
4
Output 1
5
VCC (5V)
6
GND
3,9
Table 3
1
5
6
9
Figure 5: Close-up of the
sub D-9 connector
