OLED B Click is a compact add-on board that lets you add a small but bright and crisp display to your design. This board features the MI9639BO-B2, a 96x39px light blue monochrome passive matrix OLED display from Multi-Inno Technology. The display on OLED B Click board™ is 19.3x7.8mm with an integrated OLED controller, the SSD1306. This controller has built-in functionalities like contrast control, normal or inverse image display, vertical and horizontal scrolling functions and much more accessible through the I2C serial interface. The display is bright, has a wide viewing angle, and low power consumption. This Click board™ is suitable for applications where bright and crisp blue text or icons need to be displayed.

OLED B Click is supported by a mikroSDK compliant library, which includes functions that simplify software development.

OLED B Click as its foundation uses the MI9639BO-B2, a 19.3x7.8mm 96x39px light blue monochrome passive matrix OLED display from Multi-Inno Technology. The MI9639BO-B2 display features an SSD1306, a 128x64 dot-matrix OLED/PLED segment/common driver with a controller. The controller has built-in functionalities like contrast control (256-step brightness control), normal or inverse image display, vertical and horizontal scrolling functions, and much more accessible through the I2C serial interface.

OLEDs are emissive and don't require a separate backlight as LCD technology does, reducing the OLED display's overall power consumption compared to LCDs. It also does not suffer from loss of contrast due to bleed-through of the backlight in the "off" pixels. OLEDs, being emissive, have a consistent contrast ratio greater than 100:1 with no limitation in viewing angle. In addition, they don't suffer from temperature-related response time delays and contrast changes.

Like any OLED display, the MI9639BO-B2 is made from a thin film of an organic compound that emits light when exposed to a current. A small monochrome display like this one represents an ideal solution for displaying text or icons. The MI9639BO-B2 display is bright, has a wide viewing angle, and low power consumption.

In addition to the display's main power supply, taken from the +3.3V microBUS™ power rail, the MI9639BO-B2 has another power pin, more precisely the power supply for DC/DC converter circuit. This pin is the power supply pin for the internal buffer of the DC/DC voltage converter. Therefore, for this pin, the Click board™ uses a low dropout linear regulator AP7331 from Diodes Incorporated, providing a 3.6V power supply out of 5V mikroBUS™ rail.

OLED B Click communicates with MCU using the standard I2C 2-Wire interface to read data and configure settings. It provides the possibility of the communication-enable feature routed to the CS pin of the mikroBUS™ socket, enabling the OLED B Click for MCU communication only when the CS pin is pulled to a low logic state. In addition, it has two more pins. First is related to the reset function, routed to the RST pin on the mikroBUS™ socket (when the pin is in a low logic state, the initialization of the chip is executed), and the second labeled as D/C and routed to the PWM pin on the mikroBUS™ socket is I2C peripheral address selection pin.

NOTE: If the noise accidentally occurs at the displaying window during the operation, please reset the display to recover the display function.

This Click board™ is designed to be operated only with a 3.3V logic voltage level, while 5V is used as a supply voltage of the AP7331 LDO. The board must perform appropriate logic voltage level conversion before use with MCUs with different logic levels. However, the Click board™ comes equipped with a library containing easy-to-use functions and an example code that can be used, as a reference, for further development.

• Interface: GPIO, I²C, SPI
• Compatibility: mikroBUS™
• Dimensions: 42.9 x 25.4mm
• Input Voltage: 3.3V, 5V

• Schematic
• MI9639BO-B Datasheet
• SSD1306 Datasheet
• OLED B Click User Manual
• GitHub