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5.4.1 Device Output Range/Types
There are three types of output options – On/Off, Pulse-Width Modulation (PWM), or Servo. This section
describes these output options.
5.4.1.1 ON/OFF Output Type
The ON/OFF output mode switches the output to be a binary ON or OFF. Depending on if the output is
configured as Active Low or Active High, the ON/OFF mode can correspond to different polarities.
5.4.1.2 Pulse-Width Modulation (PWM) Output Type
Pulse-Width Modulation (PWM) controls the amount of power given to a device by cycling the on/off
phases of a digital signal. PWM consists of a duty cycle and frequency. The Duty Cycle measures the amount
of time a signal is in the ON state as a percentage. The frequency controls how fast the PWM cycle is
repeated. Users can select between the following settings:
Option
Value
Description
Rate
100 Hz
Signal has a constant 100 Hz frequency with 0-100% Duty Cycle
10 Hz
Signal has a constant 10 Hz frequency with 0-100% Duty Cycle
1 Hz
Signal has a constant 1 Hz frequency with 0-100% Duty Cycle
0.1 Hz
Signal has a constant 0.1 Hz frequency with a 0-100% Duty Cycle
Signal Type
Active LOW When the output is active, it is pulled to ground (LOW)
Active HIGH When the output is active, it is in a high impedance state
5.4.1.3 SERVO Output Type
The SERVO output allows driving servo motors that control position. A Servo output is a special case of the
PWM output, where the ON time varies between 1.0 msec and 2.0 msec or between 0.5 msec and 2.5 msec,
with the lower bound representing 0 degrees and the upper bound representing 180 degrees of angular
travel. The typical non-critical frequency is 50 or 100 Hz. Servo outputs are always active high.
Option
Value
Description
Rate
100 Hz
Signal has a constant 100 Hz frequency
50 Hz
Signal has a constant 50 Hz frequency
Pulse Width
Range
1.0-2.0 msec On time varies between 1 and 2 msec
0.5-2.5 msec On time varies between 0.5 and 2.5 msec
Figure 26: SYNC interface output type selection
20 % Duty Cycle
Example shows a PWM output signal configured
with a 100 Hz frequency and active HIGH
outputs. The duty cycle has been set to 20%.
100 Hz
Figure 27: PWM function diagram
