Figure 49: CAN Reference Schematic
2.17.3 Unused CAN Interface Signal Termination
According to the Apalis standard, the CAN interface signals do not need to be GPIO capable. It
depends on the module whether the CAN interface signal pins can be used for other purposes if
the CAN interface is not in use. Some Apalis modules provide the CAN interface by using a
dedicated controller. It is recommended to tie the CAN RX signals to ground or 3.3V if the interface
is not used. This can help in reducing the power consumption of modules with stand-alone CAN
controller.
2.18 PWM
The Apalis module form factor defines five pulse width modulator (PWM) outputs - four general
purpose outputs and one dedicated for the backlight of the display. Since not all SoCs provide up
to five PWM channels, there might be some shared channels which cannot be used concurrently.
Please read the relevant datasheet of the module carefully. The maximum output frequency and
the available duty cycle steps can also vary between the different Apalis modules.
2.18.1 PWM Signals
Table 30: PWM Signals
2.18.2 Reference Schematics
The PWM output signals can be used to drive motors, LEDs, robotic servos, fans, etc. It is possible
to get an analogue signal with a simple low pass filter.
To Next Page
Loading...
