Backplane connector¶
A female 20-pin double-row connector (PBD-20R) with 2.54mm pitch is mounted on the controller board for backplane connection.
Dimensions and output pins numbers in BPC (BackPlane Connector), connector-side view.
Pin function:
1 - GND, duplicates the corresponding pin of mini USB connector.
2 - VBUS, duplicates the corresponding pin of mini USB connector.
3 - D-, duplicates the corresponding pin of mini USB connector.
4 - D+, duplicates the corresponding pin of mini USB connector.
5 - Joy, an analog 0-3 V input used for external joystick connection.
6 - Pot, an analog 0-3 V input used for general purpose.
7 - RX, a serial port input, 3.3V logic.
8 - TX, a serial port output, 3.3V logic.
9 - A Clock signal for external driver control, 3.3V logic.
10 - A Direction signal for external driver control, 3.3V logic.
11 - BUT_R, an external "Right" button input.
12 - BUT_L, an external "Left" button input.
13 - A common input/output (or an Enable signal if an external driver is used), 3.3V logic.
14 - An output for magnetic brake control, 3.3V logic.
15 - Synchronization output, 3.3V logic.
16 - Synchronization input, 3.3V logic.
17 - A LED Power output displaying 3.3V power supply for controller.
18 - A LED Status output displaying controller's operating mode.
19 - A LED output for left limit switch.
20 - A LED output for right limit switch.
Note. No additional connection or pull-up to ground/power supply is required for idle pins. Just don't use them.
IMPORTANT. A maximum designed operating voltage for Joy and Pot analog inputs is UP TO 3V. Never supply these inputs with higher voltage, including 3.3V value, otherwise the proper operation of all the analog channels of the controller may get disrupted and the controller itself or the motor may get damaged.
IMPORTANT. The outputs available at the internal connector are not protected. Mounting of any additional buffers or filtering chains is a total responsibility of user or developer who designs a backplane intended to use these lines.
IMPORTANT. While the controller is unpowered, no voltage over 0.3V relative to the DGND pin is allowed on the internal connector. Provision of any additional protection preventing those accidents (if possible) is a total responsibility of user or developer who designs a backplane intended to use these lines.