• 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: Raspberry Pi Pico 2 RP2350 With 0.96 inch LCD Display 0.96inch Screen 160×80 Onboard RP2350A Arduino Thermal imaging camera Raspberry Pi Pico 2 Plus RP2350 Board RP2350A Type-C Power Adapter X1012 Raspberry Pi 5 POE And PCIe to M.2 NVMe SSD Board Pi5 2280 Power over Ethernet SIM7600G H Mini PCIe SIMCom Original 4G LTE Cat-4 Module Global Coverage GNSS DDSM400 Direct Drive Servo Motor All-In-One Design Hub Serial -LIN Bus Motor Raspberry Pi 5 Fan NanoKVM-USB Quick Start spotpear Changeable Photo Frames Raspberry Pi 5 PCIe to M.2 5G/4G/3G HAT With RM520N-GL X1005 Raspberry Pi 5 PCIe to M.2 NVMe Dual SSD Adapter Board HAT Pi5 Double 2230/2242/2260/2280 Accelerometer Rockchip LuckFox XIAO RA4M1 Tiny SuperMini Board For Arduino Uno IDE For SeeedStudio R7FA4M1 Arduino MLX90640 Solar Power Manager Module (D) Raspberry Pi 5inch Display 1024x600 HDMI Capacitive TouchScreen 5 inch LCD B Wide-Cover For Mini PC