2.7" Diagonal E-Ink Display (4098)

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psherman42
 
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Joined: Fri Oct 08, 2021 10:11 pm

2.7" Diagonal E-Ink Display (4098)

Post by psherman42 »

What is the driver chip that is mounted on this board? Is it the IL91374 part, from Good Display, or some other part? What is the command to read back revision information, is it 0x70? What is the command to read back status information, is it 0x71?
Sending either of these commands shows no data on the MISO_3V line (pin 17 of IC1 has temporarily been lifted so not interfere with the low impedance output of IC1). In readback mode, is the SDA (SDIO) pin an open-drain output, thus requiring pull-up?
As wired, BSI=L which means 4-wire SPI interface mode. Could it be the case that, in 4-wire SPI mode, the driver chip does not offer readback function? Must the 3-wire SPI mode be used?

The Eagle CAD files and schematic for this board appear to be at https://github.com/adafruit/Adafruit-E- ... isplay.brd although I cannot find any Bill Of Materials document, spreadsheet, or other list.

Related question about which driver chip is mounted is in viewtopic.php?p=856129&hilit=4098#p856129

Thanks!

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