UMAX140610. LIN
– J1939 CAN Protocol Converter with PWM Output. Version 1
Page: 16-81
When the output is being driven by the Control Input, the state is logically set to OFF when the
Control Input is zero and is set to ON whenever a non-
zero value is written. By default, ‘
Normal
Logic’
is used. The resulting Drive State will depend on the “
Digital Control Response
” as the
table below.
Table 7. Digital ON/OFF Logic
Value Meaning
Logic State
Drive State
0
Normal Logic
OFF
OFF
ON
ON
1
Inverse Logic
OFF
ON
ON
OFF
2
Latched Logic
ON to OFF
No change
OFF to ON
State change (i.e., OFF to ON or ON to OFF)
3
Blinking Logic
OFF
OFF
ON
Toggling OFF and ON at the rate defined in setpoint
“
Digital Blink Rate
” (in ms)
3.2.4 Common Parameters
In order to prevent abrupt changes at the output due to sudden changes in the command input,
the user can choose to use the independent up or down ramps to smooth out the response.
The
“Ramp Up (Min to Max)”
and
“Ramp Down (Max to Min)”
parameters are in
milliseconds, and the step size of the output change will be determined by taking the absolute
value of the output range and dividing it by the ramp time. However, these setpoints are set to
zero by default since in most signal conversion applications, fast response times are desired.
Another setpoint
“Digital Type VPS range”
determines if the signal will toggle between 0V
and
+6V
or +
13V
.
