• sales

    +86-0755-88291180

2.9inch e-Paper HAT (D)

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.




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 5 PCIe to SATA Expansion Board with EEPROM HAT+ Industrial Isolation USB TO RS232/485/422/TTL FT232RNL Serial UART Converter Adjustable Focus Spotpear XIAO-nRF52840 Plus 20GPIOs BLE Sense Tiny SuperMini Onboard Mic/Sensor For Arduino For SeeedStudio 360° Raspberry Pi 5 Silver-Shadow Case Raspberry Pi 4B ESP32 2 inch Capacitive TouchScreen LCD Display ST7789 CST816D 240x320 For Arduino/Raspberry Pi/Pico Raspberry Pi RTC WatchDog BPI-M4 Zero Gripper Serial Robotic Arm Gripper Mechanical claw Serial Bus Servo ST3215/CF35-12 Raspberry Pi RP2040 Raspberry Pi 5.83 inch e-Paper link (G) RYBW 800x480 For Arduino / Jetson / STM32 /ESP32 Raspberry Pi 5 Power Luckfox Raspberry Pi 5 Serial Jetson Nano Raspberry Pi display ESP32-S3 Relay 6-Channel IOT WiFi Bluetooth RS485 Pico Protection Circuits