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5.6 General I/O
General I/O provides analog input as well as digital output. Each General I/O port can be used either as input or as output.
A 680-ohms pull-up resistor connects to +5 VDC and can be switched on and off for each I/O independently. I/O voltage with
pull-up on is approx. +4.3 VDC, because the protection diode is connected in series (0.7 V dropdown).
Analog input is rated 0 – 5 VDC. Analog to digital (A/D) converter has 10-bits precision (i.e. 1024 levels).
Digital output can switch max. 24 VDC / 80 mA. Output voltage for output switch on is approx. 0.6 V.
I/O schematic diagram
Input / Output Signal
Connector pinout
5-pin 3.5 mm
1 2 3 4
S S
S S
G
ON
680 Ohm
Ground
Figure 5-12. I/O schematic diagram.
Table 5-18. Connector pinout.
GENERAL I/O
Pin
Signal
Description
S
Signal
Input / Output Signal 1 - 4
G
GND
Common ground for all I/Os
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+5 VDC
OFF
PULLUP
value ON / OFF
A
D
10 bit
Chapter 5: Connecting
INPUT
OUTPUT
value CLOSE / OPEN
Page 35
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