Instruction manual

Camera interfaces
MARLIN Technical Manual
Page 28
The inputs can be connected directly to +5 V. If a higher voltage is used, an external resistor
must be placed in series. Use @+12 V a 470 Ω and @+24 V a 1.2 kΩ resistor.
 Voltages above +45 V may damage the optical coupler
 Setting inputs to high-speed mode requires very clean input signals. It is recommended to
use the normal speed mode (default).
The optical coupler inverts all input signals. Polarity is controlled via the IO_INP_CTRL1..2
register.
Input signal
Input polarity
Input
Input state
Opto-
coupler
Figure 20: Input block diagram