6032-410-000 Digilent

1300 Henley Court Pullman, WA 99163 509.334.6306 www.digilentinc.com Orbit BoosterPack Reference Manual Revised June 5, 2013 This manual applies to the Orbit BoosterPack rev. A Overview The Digilent Orbit BoosterPack is an add-on board for the Texas Instruments Stellaris LaunchPad microcontroller evaluation kit. The Orbit greatly expands the input/output capabilities of the LaunchPad, as well as introducing Digilent Pmod expansion connectors. Features include: Two 1x6 Digilent Pmod connectors 3-axis accelerometer 2 256 Kbit I C EEPROM 2 I C temperature sensor 128x32 pixel OLED display Analog potentiometer The Orbit BoosterPack. 1 Orbit BoosterPack Hardware Description The following gives a basic description of the input/output hardware contained in the Orbit BoosterPack and how to use it. Refer to Appendix A for a table showing pin definitions. 1.1 OLED Graphic Display The Orbit board provides a 128x32 pixel, organic LED (OLED), graphic display panel. The graphic display panel used is the WiseChip/Univision UG-23832HSWEG04. This display uses the Soloman Systech SSD1306 display controller. The UG2832 has a power on/power off sequence that should be followed. Failure to follow the power on/power off sequence can shorten the life of the display. The Orbit provides two FETs for software control of the two power supplies for the display. The VDD OLED control is used to turn on/off the power to the logic of the display. The Copyright Digilent, Inc. All rights reserved. DOC : 6032-502-000 Page 1 of 5 Other product and company names mentioned may be trademarks of their respective owners. Orbit BoosterPack Reference Manual VBAT OLED control is used to turn on/off power to the OLED display itself. These two pins have pull-up resistors to turn off their respective power supplies when not being driven. The pins are made to be outputs and are driven low to turn on the power supplies. Power on sequence: 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: Send Display Off command Power off VBAT Delay 100ms Power off VDD The display has a D/C pin (display or command select) that is used to determine whether bytes sent to the display are interpreted as commands or as display data. The D/C pin is driven high for display buffer access and is driven low for command access. This pin is shared with VBUS detection on the LaunchPad. If VBUS is present, the pull- down resistor acts as a pull-up resistor in conjunction with resistor 6 (R6) on the LaunchPad. Please see the note in the Orbit BoosterPack Schematic available from www.digilentinc.com. The D/C pin is also a non-maskable interrupt (NMI) pin on the LaunchPad, and is locked on the device s power- up. In order to unlock the D/C pin to be used as a general purpose output, 0x4C4F434B must be written to GPIOLOCK register. For more information, please see the LM4F120H5QR Datasheet at: www.ti.com. The RES pin is used to reset the SG1306 display controller. The RES pin is driven low for reset and driven high for normal operation. The low-going reset pulse must be a minimum of 3 s (microseconds) for the display controller to reset correctly. The UG2832 is a serial device that is accessed using SPI. It is however, a write-only device. It is not possible to read back either the display buffer contents or any kind of status from the panel. The maximum SPI clock frequency supported by the UG2832 is 10MHz. Digilent has a library for use with the Orbit BoosterPack that provides functions for initializing the display and rendering simple text and graphics onto the display. This library can be used as is or as a starting point for a more sophisticated graphics library and is available at www.digilentinc.com. 1.2 Digilent Pmod Connectors Two 1x6 pin female Digilent Pmod connectors are provided for functional expansion of the Orbit BoosterPack. They are labeled JA and JB respectively. Header JA has signals routed to the Synchronous Serial Interface (SSI) Copyright Digilent, Inc. All rights reserved. Page 2 of 5 Other product and company names mentioned may be trademarks of their respective owners.