UMAX140610. LIN
– J1939 CAN Protocol Converter with PWM Output. Version 1
Page: 15-81
3.2.1 Digital PWM/Digital Frequency
Simply setting the
“Output at Minimum Command”
and
“Output at Maximum Command”
to
corresponding value in each range will drive the output to different range options. The unit of
measurement for PWM output variables is percentage [%] and Hertz [Hz] for the frequency
output. Pulse Width Modulated output use a fixed frequency determined by the value in the
“Fixed Frequency/Duty Cycle”
setpoint and frequency output use a fixed duty cycle as
selected by this setpoint.
3.2.2 Digital Mixed PWM and Frequency
With the
‘Mixed PWM and Frequency’
output type, output control signal controls duty cycle of
the output. With this output type duty cycle is considered as main variable, thus associated
setpoints are interpreted in percentages, Frequency control signal is selected with
“Frequency
Control Source”
and
“Frequency Control Number”
setpoints. Associated
“Mixed Output
Frequency Min”
and
“Mixed Output Frequency Max”
setpoints determine minimum and
maximum values of the frequency control signal.
3.2.3 Digital ON/OFF
If a non-digital control is selected for this type, the command state will be OFF at or below the
minimum input, ON at or above the maximum input, and it will not change in between those
points. In other words, the input has its built-in hysteresis, as shown in the figure below. This
relationship is true for any function block that has a non-digital input mapped to a digital control.
Figure 4. Analog to Digital Input
Only when a
‘Digital ON/OFF’
type has been selected will the
“Digital Control Response”
setpoint be enabled as shown in the table below.
Table 6. Digital Control Response Options
Value
Meaning
0
Normal Logic
1
Inverse Logic
2
Latched Logic
3
Blinking Logic
