• sales

    +86-0755-88291180

7.5inch e-Paper (C)

Introduction


Note:
 The raw panel require a driver board, If you are the first time use this e-Paper, we recommend you to buy the HAT version or buy more one driver hat for easy use, otherwise you need to make the driver board yourself. And this instruction is based on the version with PCB or driver board.

800x480, 7.5inch E-Ink display HAT for Raspberry Pi, three-color, SPI interface


【Version update instructions】:

  • This product has been updated to V2 version with higher resolution, supporting 800x480 resolution (V1 version has 640x384 resolution)
  • The hardware structure and interface of V2 version of this product are compatible with V1 version, but the software needs to be updated


Interfaces


VCC3.3V
GNDGND
DINSPI MOSI
CLKSPI SCK
CSSPI chip select (Low active)
DCData/Command control pin (High for data, and low for command)
RSTExternal reset pin (Low for reset)
BUSYBusy state output pin (Low for busy)


Working principle


Introduction


This product is an E-paper device adopting the image display technology of Microencapsulated Electrophoretic Display, MED. The initial approach is to create tiny spheres, in which the charged color pigments are suspending in the transparent oil and would move depending on the electronic charge. The E-paper screen display patterns by reflecting the ambient light, so it has no background light requirement. Under sunshine, the E-paper screen still has high visibility with a wide viewing angle of 180 degree. It is the ideal choice for E-reading.


Communication protocol




Note: Different from the traditional SPI protocol, the data line from the slave to the master is hidden since the device only has display requirement.

  • CS is slave chip select, when CS is low, the chip is enabled.
  • DC is data/command control pin, when DC = 0, write command, when DC = 1, write data.
  • SCLK is the SPI communication clock.
  • SDIN is the data line from the master to the slave in SPI communication.

SPI communication has data transfer timing, which is combined by CPHA and CPOL.

  1. CPOL determines the level of the serial synchronous clock at idle state. When CPOL = 0, the level is Low. However, CPOL has little effect to the transmission.
  2. CPHA determines whether data is collected at the first clock edge or at the second clock edge of serial synchronous clock; when CPHL = 0, data is collected at the first clock edge.
  • There are 4 SPI communication modes. SPI0 is commonly used, in which CPHL = 0, CPOL = 0.

As you can see from the figure above, data transmission starts at the first falling edge of SCLK, and 8 bits of data are transferred in one clock cycle. In here, SPI0 is in used, and data is transferred by bits, MSB first.

TAG: ESP32-S3N8R8 7inch LCD Display TouchScreen 800×480 WiFi Bluetooth CAN RS485 Sensor Raspberry Pi Autofocus Camera Bus servo driver board ESP32 S3 2.1 inch Round LCD Development Board 480x480 TouchScreen Display LVGL HMI With QMI8658C 6-Axis Sensor UART 7inch LCD 1024×600 Computer PC Monitor Display Secondary Screen TypeC USB CPU RAM Only For Windows Bus Servo Adapter A Electronic EYE 0.71 inch Round LCD Display Screen For Arduino Raspberry Pi ESP32 Pico STM32 Arduino Thermal imaging Milk-V 2.13inch e Paper HAT+ Black-White 250x122 E-Ink For Raspberry Pi /Jetson Nano /Sunrise X3 Pi /Pwnago CH340 driver MAX9296 GMSL Camera Adapter Board 2-Ch High-Speed And Low-Latency Transmission For Jetson Orin Nano/NX ESP32-S3 1.28inch LCD Raspberry Pi 5 PCIe to 2-CH PCIe FFC Dual PCIe HAT Board Pi5 Double 3.5 inch LCD Computer CPU GPU RAM Monitor PC USB Secondary Display Screen ESP32-S3FH4R2 ESP32-C3FN4 Raspberry Pi 1.54inch OLED Raspberry Pi 5 Silver-Shadow Case