Connecting the Pervasive Displays e-Paper EPD Extension Kit Gen 3

Compared to previous generations, the Pervasive Displays e-Paper EPD Extension Kit Gen 3 includes a 20-way cable with the standard electronics colours.

This eases the identification of each signal, speeds up the connection and limits the errors

So connecting the Pervasive Displays e-Paper EPD Extension Kit Gen 3 or EXT3 is as easy as counting from 1 to 10!

Connecting the EXT3 to the screen

The Extension Kit Gen 3 features two connectors for flat cables:
  • Top with 34 ways for the 9.7" and 12.2" screens,
  • Right with 24 ways for the other screens.

Gently lift the lock up, insert the flat cable and replace the lock back. Only one screen can be attached at a time.

The final step is the jumper for the inductance.
  • Top with 47 µH for screens larger than 5.0",
  • Bottom with 10 µH for screens smaller than 4.37".
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On the example shown on the right, a 24-way flat cable is attached and the jumper is positionned for a screen smaller than 4.37".
For a safe connection of the e-paper displays, please refer to EPD Handling and ESD Precaution.

Connecting the EXT3 to the micro-controller

To connect the EXT3 to the micro-controller, plug the 20-way cable into the male pins of the EXT3 board with
  • The white cable in front of the white mark of the silk-screen;
  • The black cable in front of the black mark of the silk-screen. It is also marked with a white dot on the connector.
All the signals are detailed below. Note that that pins 11 and 20 are optional.
Picture
On the micro-controller side, only the top part of the 20-way cable numbered 1 through 10 is going to be connected:
  • White number 10 for GROUND
  • Black number 1 for +3.3V
  • Brown number 2 to SPI clock
  • Green number 6 for SPI MISO
  • Blue number 7 for SPI MOSI
      
Power and logic signals are 3.3V only.

Connecting the EXT3 to 5V may damage the board and the screen. A regulator and logic level converters are required.
The connections for the other cables are specific to each board.

On the sofware side, the hV_Configuration.h file of the ePaper_EXT3_Basic_Library (link 1, link 2) lists those configurations.

To select a given board, just use the board name to the screen constructor, here for boardLaunchPad.

On the hardware side, the following sections provide the configurations for the most popular boards:
hV_Configuration.h

    









					
									

		
	






Posted: 28 Feb 2021
Updated: 24 May 2021, 24 Aug 2021, 16 May 2022