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1300 Henley CourtPullman, WA 99163509.334.6306www.digilentinc.comPmodOLED™ Reference ManualRevised May 24, 2016This manual applies to the PmodOLED rev. AOverviewThe PmodOLED features an SPI-controlled monochrome OLED display, perfect for embedded applications requiringsmall, complex visual output.Features include:128×32 pixel graphic OLED displayClock speeds of up to 10 MHzInternal display buffer16 different brightness settingsSmall PCB size for flexible designs12-pin Pmod connector with SPI interfaceLibrary and example code available in resourcecenterThe PmodOLED.1Functional DescriptionThe PmodOLED uses a standard 12-pin connector to display output on a 128x32 pixel organic LED (OLED) panel.The graphic display panel uses the Solomon Systech SSD1306 display controller.An SPI interface is used to configure the display, as well as to send the bitmap data to the device.The PmodOLED displays the last image drawn on the screen until it is powered down or a new image is drawn tothe display.

Refreshing and updating is handled internally.DOC#: 502-222Copyright Digilent, Inc. All rights reserved.Other product and company names mentioned may be trademarks of their respective owners.Page 1 of 3PmodOLED™ Reference Manual1.1Power SupplyThe PmodOLED has two field-effect transistors (FETs) that control the display’s two power supplies. The VDDCcontrol toggles the power to the logic of the display. The VBATC control toggles the power to the OLED displayitself.These two pins have pull-up resistors that turn off their respective power supplies when they’re not being driven.These pins are configured as outputs and driven low to turn on the power supply.The PmodOLED has a particular power-on/power-off sequence that must be followed to prolong the life of thedisplay.Power-on sequence:1.2.3.4.5.6.7.Apply power to VDD.Send Display Off command.Initialize display to desired operating mode.Clear screen.Apply power to VBAT.Delay 100ms.Send Display On command.Power-off sequence:1.2.3.4.2Send Display Off command.Power off VBAT.Delay 100ms.Power off VDD.Interfacing with the PmodThe display has a D/C pin (display or command select) that determines whether bytes sent to the display areinterpreted as commands or as display data.

The D/C pin is set high for display buffer access and low for commandaccess.The RES pin is used to reset the SSD1306 display controller. The RES pin is driven low for reset and driven high fornormal operation. The low-going reset pulse must be a minimum of 3us (microseconds) in duration for the displaycontroller to reset correctly.The UG2832 display is a serial device that is accessed using SPI. It is a write-only device, so it is not possible to readthe display buffer contents or status from the panel.

The maximum SPI clock frequency is 10Mhz. The CS (ChipSelect) pin has to be held low for the display to receive data over the SPI interface.Digilent has libraries for the PmodOLED that provide functions for initializing the display and rendering simple textand graphics onto the display. These libraries can be used as-is or as a starting point for a more sophisticatedgraphics library. They are available on the PmodOLED product page at www.digilentinc.com.Copyright Digilent, Inc. All rights reserved.Other product and company names mentioned may be trademarks of their respective owners.Page 2 of 3PmodOLED™ Reference ManualConnector J1PinSignalDescription12CSSDINSPI Chip Select (Slave Select)SPI Data In (MOSI)3NoneUnused Pin4SCLKSPI Clock7D/CData/Command Control8RESPower Reset9VBATCVBAT Battery Voltage Control10VDDCVDD Logic Voltage Control5, 116, 12GNDVCCPower Supply GroundPower SupplyTable 1.

Interface connector signal description.For more information on the OLED display interface, see the UG-2832HSWEG04 datasheet available online or fromUnivisio.The OLED display uses a compatible command set from the SSD1306 device. For more information, see theSSD1306 datasheet available at www.solomon-systech.com.Copyright Digilent, Inc. All rights reserved.Other product and company names mentioned may be trademarks of their respective owners.Page 3 of 3.

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