Epec CAN Module Family
2024 CONTROL MODULE
12 / 34
07.10.2010
2024G08,G18 / MAN000185
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3.4 Digital Input / PWM Output / Digital Output
These pins are current sourcing outputs. In other words, pin connects the load to positive supply
voltage. The application program can also simultaneously monitor the actual state of the pin.
This feature makes it possible to detect short circuits to the ground. Open loads can not be
detected because the internal load resistor is connected to the ground.
Connector X1 Connector X2
X1.1
X1.2
X1.3
X1.4
X1.7
X1.8
X1.14
X1.15
X1.16
X1.17
X1.22
X1.23
X2.1
X2.2
X2.5
X2.6
X2.7
X2.8
X2.9
X2.10
X2.16
X2.17
X2.22
X2.23
These kind of outputs are also capable to generate pulse width modulated (PWM) output
signals. This feature is useful when driving proportionally controlled loads, e.g. proportional
hydraulic valves. Monitoring the state of the pin is generally not possible when the pin is used as
a PWM signal output.
PWM frequencies can be configured under software control in groups of outputs. The frequency
is set by HW_SET_PWM_FREQ function call. The setting is done by a PWM channel but
setting the frequency of one channel sets also the frequencies of all the other channels in the
same groups.
In very carefully selected applications a pin of this type can also be used as an input by using
the output state monitoring feature. In those cases, the output functionality of the pin must of
course be kept in off state. It must be taken care in system design that the output unintentionally
switching to on state causes no harm to the system.
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