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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
DOC#: 6032-502-000
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Other product and company names mentioned may be trademarks of their respective owners.
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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 3μs (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)
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Orbit BoosterPack™ Reference Manual
peripheral on the LaunchPad. These signals can be used with Pmods that use standard 3 or 4 wire SPI
communication protocol.
1.3
Discrete Digital I/O Devices
Pushbuttons:
There are two pushbutton switches labeled BTN1 and BTN2. A read to the corresponding GPIODATA
register bits will return a '0' when the button is released and a '1' when the button is pressed.
Slide Switches:
There are two slide switches labeled SW1 and SW2. A read to the corresponding GPIODATA
register bits will return a '0' when a switch is down (toward the LEDs) and
a '1'
when a switch is up (toward the
OLED display).
LEDs:
There are four LEDs, labeled LD1 – LD4. An LED will be illuminated when the corresponding GPIODATA
register bit is set to a
'1'
(given the corresponding direction bit has been set in the GPIODIR registers) and off when
set to a
'0'
.
1.4
2
I
2
C Bus
2
The I C bus from the LaunchPad microcontroller board is brought onto the Orbit BoosterPack. There are three I C
devices on the board: a 256 Kbit EEPROM, a temperature sensor, and an accelerometer. In addition, there is a
2
2
connector for taking the I C bus off of the board to connect to additional external I C devices.
I C Connector:
Connector J5 can be used to extend the I C bus off of the board to connect to additional external I C
2
devices. J5 is a standard 2x4 pin header connector with 0.100” spaced pins. It provides access to the I C signals, SCL
2
and SDA, plus VCC3V3 and GND. The VCC3V3 can be used to power external I C devices.
The I C bus uses open collector drivers to allow multiple devices to drive the bus signals. This means that pull-up
resistors must be provided to supply the logic high state for the signals. The Orbit BoosterPack provides 2.2 K-ohm
pull-up resistors. Generally, only one set of pull-up resistors are used on the bus.
Digilent has several small I/O modules available that can be connected using the I C connector. These include a 4-
channel, 12-bit A/D converter, serial character LCD panel, 3-axis gyroscope, real-time clock/calendar, and I/O
expander.
EEPROM:
A 256Kbit (32Kbyte), I C EEPROM is provided using a Microchip 24LC256. This EEPROM, IC3, is located on
the bottom side of the board.
The seven bit I C device address for the EEPROM is '1 0 1 0 A2 0 0', where A2 is an external pin. Pin A2 is pulled
2
high through a 10 K-ohm resistor and a cuttable trace at JP7. Therefore, the 'as-is' seven bit I C device address for
the EEPROM is '1010100', or 0x54. Cutting the trace between pins 1 and 2 of JP7 and loading a two-pin header
with a shorting block on pins 2 and 3 of JP7 will make the 10 K-ohm resistor acts as pull-down. In this case, A2 must
be set to '0' in software.
For complete technical documentation on the 24LC256, refer to the data sheet available from
www.microchip.com.
Temperature Sensor:
A digital temperature sensor is provided using a Microchip TCN75A 2-Wire Serial
2
Temperature Sensor. The temperature sensor, IC4, is an I C device, and is located next to BTN1.
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2
2
2
2
2
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The TCN75A is rated for an accuracy of +/-1ºC and has selectable resolution from 0.5ºC down to 0.0625ºC. The
seven bit device address is '1001111', or 0x4F. Note that the last three bits set to '1' because external pins A2, A1,
and A0 are pulled high by 10 K-ohm resistors and cuttable traces at JP2, JP4, and JP6.
The TCN75A provides an alert output that can be programmed for various functions.
For complete technical documentation on the TCN75A, refer to the data sheet available at
www.microchip.com.
Accelerometer:
A 3-axis accelerometer is provided using an Analog Devices ADXL345. This accelerometer, IC2, is
located to the right of BTN2. The silkscreen shows the axis configuration.
The 7 bit I C device address for the accelerometer is '0011101', or 0x1D.
The ADXL345 has two output pins for setting configurable interrupts, which include activity, inactivity, and
DATA_READY.
For complete technical documentation on the ADXL345, refer to the data sheet available at
www.analog.com.
2
1.5
Potentiometer
A potentiometer (pot) is provided on the board to be used as an analog signal source or analog control input. The
pot is a 1 K-ohm trimmer pot connected between the VCC3V3 supply and ground. The wiper of the pot is
connected to analog input AIN0.
Appendix A: Orbit BoosterPack Pinout Table
Connector #
J1
J1
J1
J1
J1
J1
J1
J1
J1
J1
J2
J2
J2
J2
J2
J2
J2
Pin #
1
2
3
4
5
6
7
8
9
10
1
2
3
4
5
6
7
Port and
Bit
-
PB5
PB0
PB1
PE4
PF5
PB4
PA5
PA6
PA7
-
PB2
PE0
-
-
-
-
Function
VCC3V3
LD4
JB_03/RX
JB_02/TX
INT2_ACL
/RES_OLED
INT1_ACL
JA_02/MOSI
SW2
SW1
GND
SCL
BTN2
-
-
-
-
Description
Power supply
User LED
Pmod connector B pin 3/Rx
Pmod connector B pin 2/Tx
Accelerometer Interrupt Output
OLED reset
Accelerometer Interrupt Output
Pmod Connector A pin 2/Serial Out
Slide switch
Slide switch
Ground
I C clock
Push button
-
-
-
-
Not connected
Not connected
Not connected
Not connected
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2
Notes
UART1
UART1
SSI0
I2C0
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Orbit BoosterPack™ Reference Manual
J2
J2
J2
J3
J3
J3
J3
J3
J3
J3
J3
J3
J3
J4
J4
J4
J4
J4
J4
J4
J4
J4
J4
8
9
10
1
2
3
4
5
6
7
8
9
10
1
2
3
4
5
6
7
8
9
10
PA4
PA3
PA2
-
-
PD0
PD1
PD2
PD3
PF1
PE2
PE3
-
-
-
PB3
PF0
PF1
PC6
PC7
PD6
PD7
JA_03/MISO
JA_01/SS
JA_04/SCK
-
GND
SCK_OLED
/CS_OLED
BTN1
SDI_OLED
VBAT_OLED
VDD_OLED
AIN
-
-
-
SDA
JB_04/RTS
JB01/CTS
LD1
LD2
LD3
/DC_OLED
-
2
Pmod Connector A pin 3/Serial In
Pmod Connector A pin 1/Slave Select
Pmod Connector A pin 4/Serial Clock
-
Ground
OLED serial clock
OLED chip select
Push button
OLED serial data in
OLED VBAT enable
OLED VDD enable
Potentiometer
-
-
-
I C data
Pmod connector B pin 4/Request to
Send
Pmod connector B pin 1/Clear to Send
User LED
User LED
User LED
OLED data/command select
SSI0
SSI0
SSI0
Not connected
SSI3/SSI1
SSI3/SSI1
SSI3/SSI1
AIN0
Not connected
Not connected
Not connected
I2C0
UART1
UART1
Not connected
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Other product and company names mentioned may be trademarks of their respective owners.
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