BIGTREETECH
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1 Product Introduction
BIGTREETECH EBB36 CAN V1.1 is a nozzle adapter board made by the 3D
printing team of Shenzhen BIQU Technology Co., Ltd. for a 36 stepper motor
extruder. It can communicate via a USB or CAN, which greatly simplifies wiring.
1.1 Product Features
1. With a BOOT and RESET buttons reserved, users can update the firmware
via DFU mode by USB.
2. Adding a protection circuit on the thermistor avoids burning the main control
chip caused by electric leakage of the heater cartridge.
3. The thermistor can select the pull-up resistor value via a jumper, in this way, it
can support PT1000 (2.2K pull-up resistor), which is convenient for DIY.
4. The USB power is selected through a jumper cap, which effectively isolates
the motherboard DC-DC and USB 5V.
5. Reserve the I2C interface, this interface can also be used for filament
runout/blocking detection, or DIY for other functions.
6. A follow current diodes are added to the inductive load interface (fan) to
ensure that when the fan MOS is turned off, the fan winding current has a
follow current loop, which effectively prevents the high voltage generated by
the winding drain at the MOS tube when it is turned off. Considering the size
of the board and the switch characteristics of the extruder fan, a Schottky
diode in a SOD-323 package is used.
7. The DCDC step-down circuit is reversely connected to a diode to prevent the
subsequent circuit from being damaged due to the reverse connection of the
power line.
8. Onboard MAX31865 (optional function, the version without 31865 does not
have this function, but there are reserved pads), supports 2-wire/4-wire
PT100/PT1000 selection.
9. Support communication via CAN or USB. The terminal resistor 120R of CAN
can be selected through a jumper cap, and it reserves a CAN expansion
interface.
10. Equipping the ESD protection chip on the USB port prevents the main control
from being broken down by the static electricity of the USB port.
11. Limit switch hardware debouncing circuit.
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