Digilent 6032-410-000P-BOARD - Manual (Page 3)

Orbit BoosterPack Reference Manual
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axis gyroscope, real-time clock/calendar, and
I/O expander.
EEPROM: A 256Kbit (32Kbyte), I
2 C EEPROM
is provided using a Microchip 24LC256. This
EEPROM, IC3, is located on the bottom side of
the board.
The seven bit I
2 C device address for the
EEPROM is ‘1 0 1 0 A2 0 0’, where A2 is an
external pin. Pin A2 is pulled high through a 10
K-ohm resistor and a cuttable trace at JP7.
Therefore, the ‘as-is’ seven bit I
2 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 Temperature Sensor. The
temperature sensor, IC4, is an I
2
C device, and
is located next to BTN1.
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
2 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 .
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.