CCpilot VS 12”
Product revision: A
Technical Manual
2017-11-23
www.crosscontrol.com
17
The co-processor handles the configurable input and adds features such as averaging for frequency
measurements. 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 and 5.8.2 below.
5.8.1.
Digital input and frequency measurement
Digital and frequency input 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.
The input can be configured for two different logic signal levels thresholds and can be set as either
pull-down only or internal pull-up (together with the pull-down). This makes the input compatible
with a wide range of sensors with different output types and signal levels.
The selectable internal pull-up is sourced from the main supply input through internal over-voltage
protection. Therefore, pull-up will follow the main supply voltage but never exceed 55 V
DC
in case of
main voltage transients.
Frequency measurement is implemented by timer captures at a time-base of 72 MHz (100 ppm).
This time-base gives a theoretical frequency resolution of approximately 0.014 Hz at 1 kHz and 3.12
Hz at 15 kHz (better resolution at lower frequencies). Refer to the
CCAux API documentation
for
details about available configurations.
See chapter 7.1 for electrical characteristics such as absolute maximum voltage, digital threshold
levels, pull-up strength, frequency range and accuracy.
5.8.2.
Voltage measurement
The input can be used for measuring DC-voltages in range of 0-32 V.
See chapter 7.1 for electrical characteristics such as impedance and accuracy.
5.9.
High-side outputs
CCpilot VS 12”
has six self-protected high-side digital outputs for switching various external loads
such as buzzers, relays, solenoids, lamps or other resistive or inductive loads.
The high-side output drivers are powered from the main supply voltage through internal over-
voltage protection that limits the output voltage to 50 V
DC
(typ) in case of supply voltage transients.
Four of the outputs are specified for 400mA load and two are specified for 800mA load, but all use
the same technical solution. Each output is current-limited to 1200 mA per channel (typ).
Each output provides diagnostics/fault-detection for both ON- and OFF-state according to Table 4
below.
Table 4: Diagnostics and fault detection for high-side outputs
OFF-state
ON-state
Open load
-
Short to battery
-
-
Overload or short to ground
-
Over-temperature
