SPI

SPI timing format

SPI commands are used to communicate between the host and the COG driver. The SPI format used differs from the standard in that two-way communications are not used.

When setting up the SPI timing, PDI recommends verifying both the SPI command format and the SPI command timing in this section.

SPI pin definition

• SCLK - serial peripheral interface clock
• SDIN - serial peripheral interface data
• D/C# - serial peripheral interface command and data pin
• CS# - panel chip select

The maximum clock speed of the display is 20MHz (Write), 2.5MHz (Read).

Step	Pin/Register	Data/Value	Name/Unit	Comment
SPI	0x50	0x27		Fast Update only
SPI	0x10	Image array	DTM1	Old image for Fast
SPI	0x13	Image array	DTM2	New image for Fast
SPI	0x50	0x07		Fast Update only

with

• Register is the register index, in the examples 0x50, 0x10, and 0x13.

• Data/Value could be

  • A fixed value, in the example 0x27,

  • Multiple values, in the example DTM1 and DTM2 for image data array,

• The D/C line is pulled LOW for command and HIGH for data.

SPI command timing

The following specifications apply for VDDIO - GND = 2.3V to 3.6V, TOPR = 25°C, CL=20pF

3.4”

5.8”, 7.4”