Monarco-HAT-Hardware-Reference-Manual

Monarco HAT Hardware Reference Manual 20190728-1
15
Digital Outputs (DOUT) 3.2.4.
Description and Electrical Design
Monarco HAT has 4 digital non-isolated open-drain outputs. The open-drain topology was chosen for
best flexibility in connecting various devices.
Outputs are able to sink up to 1 A current, which is enough for direct connection of a robust
contactor coil or a small DC motor. Maximal switching voltage is 40 V. All outputs are protected
against short-circuit, peak overvoltage and driver thermal overload.
To allow direct connection to a standard 5 V CMOS/TTL logic inputs, pull-up resistors (1.2 kOhm) with
a diode to 5 V rail are integrated.
Image 3.4: Digital outputs internal implementation.
Image 3.5: Digital inputs connection examples with various actuator types.