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Duet 3 1HCL Expansion Board
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The Duet 3 Expansion 1HCL has a number of peripheral inputs and outputs for functions such as sensing motor temperature, controlling a brake and axis endstop. It connects to the Duet 3 CAN-FD bus using RJ11 connectors (the same as the Duet 3 Mainboard 6HC, Duet 3 expansion boards, and the tool distribution board). Multiple 1HCL boards can be daisy-chained on the bus, with power (up to 48V) provided locally. This allows for very large machines to be constructed without a significant wiring burden and signal integrity issues.
The documentation contains more details; a summary of the feature set is here:
ARM Cortex-M4F microcontroller running at 120MHz.
An advanced TMC2160A stepper driver: SPI controlled, can be run in open loop or closed-loop mode. Maximum motor current 6.3A peak per phase (4.45A RMS).
Two medium-current (2.5A max recommended) outputs at VIN or VBRAKE voltage with PWM capability
Two 3.3V-level PWM capable output (3mA max),
Two digital inputs
One thermistor/PT1000 input
12 to 48V power input
On-board 12V, 5V and 3.3V regulators
CAN-FD interconnect to main controller board and other expansion boards