When an input like this is configured to current mode, it can’t withstand the normal maximum input voltage rating. The maximum rating is lowered in this case to 15 volts.
These pins are analog inputs
The pins can be configured either as a current input or as a voltage input.
There is a control signal for selecting:
Voltage mode: High impedance input for signal from 0 to 5 V
Current mode: Low impedance input for signal from 0 to 22 mA
These pins can be used as high impedance voltage inputs for signals from 0 to 5 volts or low impedance current inputs for signals from 0 to 22,7 milliamperes.
Pins of this kind can be used as e.g. joystick connection when 54,7 kΩ GND (voltage input) is selected.
The input impedance of each pin is controlled by a bit in output memory (%Q)
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|
When an input like this is configured to current mode, it can’t withstand the normal maximum input voltage rating. The maximum rating is lowered in this case to 15 volts. |
These pins can also be used as digital inputs by using an application library.
The pin must be configured to voltage mode when using as digital input
Electrical characteristics
|
Symbol |
Parameter |
Conditions |
Min |
Max |
Units |
|
VI |
Input Voltage measuring range |
|
0 |
5 |
V |
|
RI |
Input Resistance |
Voltage mode (referenced to GND) |
typ. 54,7 |
kΩ |
|
|
Current mode |
typ. 220 |
Ω |
|||
|
II |
Input Current measuring range |
|
0 |
22,6 |
mA |
|
TIRE/IE |
Total Input Referred Error /Input Error |
|
|
|
mA |
|
πI |
Time Constant of Input Low Pass Filter |
|
|
|
ms |
|
CI |
Input pin capacitance |
|
typ. 1 |
nF |
|
|
VI-range |
Input voltage range |
Voltage mode Overload conditions (Note 1) |
-0,7 |
32 |
V |
|
Current mode Overload conditions (Note 1) |
-0,7 |
15 |
V |
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Note 1: Exceeding the max value might cause damage to input.
