CCpilot VA
1.2
Technical Manual
2017-03-13
www.maximatecc.com
23
5.8.
Configurable Inputs
CCpilot VA
has eight configurable inputs for a wide range of digital and analog measurements.
Note that there are two types of inputs. Channels 1-4 support resistance measurement but lack internal
pull-up resistors. Channels 5-8 lack support for resistance measurement but have internal pull-up
resistors. A summary of digital and analog input modes for each input are listed in the table below:
Input modes
Configurable
Input 1-4
Configurable
Input 5-8
Digital input modes
Digital input
Selectable ranges:
Selectable input
configurations:
5V, 10V or 32V
Floating or pull-
down
5V, 10V or 32V
Floating, pull-up or
pull-down
Frequency
measurement
Selectable range:
Selectable input
configuration:
0.1-15 000 Hz
Floating or pull-
down
0.1-15 000 Hz
Floating, pull-up or
pull-down
Analog input modes
Voltage
measurement
Selectable ranges:
5V, 10V or 32V
5V, 10V or 32V
Current
measurement
Range:
Input resistance:
4-20 mA
100 Ω
(overload protected)
4-20 mA
100 Ω
(overload protected)
Resistance
measurement
Selectable ranges:
500 Ω or 5 000 Ω
(N/A)
For electrical specification at different input modes, see
chapter 7.1
.
Note that the input grounds are internally joined with each other and with main supply ground.
Precautions should be made to avoid ground-loops between input grounds and between input- and
main supply ground. Ground-loop currents may affect readings.
The co-processor handles all configurable inputs and adds features such as averaging for frequency
measurement and protection of current input shunt resistors. Measurement results are accessible to
user applications through software APIs. Refer to the
CCAux API documentation
for programming
details. Each input mode is described more in chapters 5.8.1 - 5.8.4 below.
5.8.1.
Digital input and frequency measurement
Digital and frequency inputs modes can be used for connecting simple logical signals (for example
switch to battery/ground or various logic output sensors) or frequency-output sensors commonly used
in industrial applications.
Each input can be individually configured for accepting a variety of logic signal levels and can be set as
either floating, with internal pull-down (available on all channels) or internal pull-up (available on
channels 5-8 only). This makes the inputs compatible with a wide range of sensors with different
output types and signal levels.
The selectable internal pull-ups (input 5-8 only) are sourced from the main supply input through
internal over-voltage protection. Therefore, pull-ups will follow the main supply voltage but never
exceeds 32 V
DC
in case of main voltage transients.
External pull-ups may be used if other pull-up
