Adafruit Qualia ESP32-S3 for TTL RGB-666 Displays

SKU: ADA5800 Brand: Adafruit

There's a few things everyone loves: ice cream, kittens, and honkin' large TFT screens....

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There's a few things everyone loves: ice cream, kittens, and honkin' large TFT screens. Adafruit are no strangers to small TFT's - from Adafruit's itsy 1.14" color display that graces many-a-TFT-Feather to Adafruit's fancy 3.5" 320x480 breakout screen. But most people who dabble or engineer with microcontrollers know that you sort of 'top out' at 320x480 - that's the largest resolution you can use with every day SPI or 8-bit 8080 interfaces. After that, you're in TTL-interface TFT land, where displays no longer have an internal memory buffer and instead the controller has to continuously write scanline data over a 16 or 18 or 24 pin interface.

TTL interface TFT displays can get big: they start out at around 4.3" diagonal 480x272, and can get to 800x480, 800x600 or even 720x720. For displays that big, you need a lot of video RAM (800x480 at 24 bit color is just over 1MB), plenty of spare GPIO to dedicate, and a peripheral that will DMA the video RAM out to the display continuously. This is a setup familiar to people working with hefty microcontrollers or microcomputers, the sort of device that run cell phones, or your car's GPS navigation screen. But until now, nearly impossible to use on low cost microcontrollers.

The ESP32-S3 is the first low-cost microcontroller that has a built in peripheral that can drive TTL displays, and can come with enough PSRAM to buffer those large images. For example, on the Adafruit Qualia ESP32-S3 for TTL RGB-666 Displays, Adafruit use a S3 module with 16 MB of Flash and 8 MB of octal PSRAM. Using the built in RGB display peripheral you can display graphics, images, animations or even video (cinepak, natch!) with near-instantaneous updates since the whole screen gets updated every ~30FPS.

This dev board is designed to make it easy for you to explore displays that use the "secondary standard' 40-pin RGB-666 connector. This pin order is most commonly seen on square, round and bar displays. You'll want to compare the display you're using to this datasheet, if it matches you'll probably be good! One nice thing about this connector ordering is that it also includes pins for capacitive touch overlay, and Adafruit wire those up to the ESP32-S3's I2C port so you can also have touch control with your display.

On the Qualia board Adafruit have the S3 modules, with 16 pins connected to the TFT for 5-6-5 RGB color, plus HSync, VSync, Data Enable and Pixel Clock. There's a constant current backlight control circuit using the TPS61169 which can get up to 30V forward voltage and can be configured for 25mA-200mA in 25mA increments (default is 25mA). Power and programming is provided over a USB C connector, wired to the S3's native USB port. For debugging, the hardware UART TX pin is available as well.

Since almost every GPIO is used, and almost all RGB-666 displays need to be initialized over SPI, Adafruit put a PCA9554 I/O expander on the shared I2C bus. Arduino or CircuitPython can be instructed on how to use the expander to reset and init the display you have if necessary. The remaining expander pins are connected to two right-angle buttons, and the display backlight. 

The expander is what lets Adafruit have a full 4-pin SPI port and two more analog GPIO pins - enough to wire up an MMC in 1-wire SDIO mode along with an I2S amplifier to make an A/V playback demo. Maybe Adafruit can even eat ice cream while watching kitten vids! There is also the shared I2C port, Adafruit provide a Stemma QT / Qwiic port for easy addition of any sensor or device you like.

Technical Details

Product Dimensions: 57.3mm x 44.4mm x 7.1mm / 2.3" x 1.7" x 0.3"

Product Weight: 13.3g / 0.5oz

Documents

This product is listed in:

Development Boards>ESP32

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