M 5 2 2 3 3 D E M O
S E P T E M B E R 2 5 , 2 0 0 6
16
Table 5:
Ethernet Port Status LED’s
Indicator Color MCU Signal
ePHY Status
COL
Red
LED_COL
ON – Packet Collisions Detected
DUP
Grn
LED_DUP
ON – Full Duplex, OFF – Half Duplex
SPD
Grn
LED_SPD
ON – 100T, OFF – 10T
LNK
Grn
LED_LNK
ON – Link Detected
ACT
Grn
LED_ACT
ON – Link Active, TX or RX
NOTE:
The Ethernet port must be initialized and active for status indications.
ACCELEROMETER
The M52233DEMO applies an MMA7260Q, 3-axis accelerometer for tilt and motion-sense ap-
plications. The accelerometer supports 4 user selectable sensitivities - 1.5g / 2g / 4g / 6g.
Separate (X/Y/Z) axis readings are routed to the MCU through the ACC_EN option header. A
SLEEP* input allows the device to be placed in a low-power mode.
An option header at ACC_EN allows the user to disconnect the accelerometer if necessary. In
default configurations, this option header is not installed and a cut-traces located on the bottom
of the board provide a signal path. To disconnect the accelerometer, simply open the cut-trace
and install a 1x3 pin-header at ACC_EN. Install a shunt on each signal to reconnect the ac-
celerometer. The table below shows the signal connections to the MCU.
Table 6
: ACC_EN Option Header
Signal MCU Input
X
AN4
Y
AN5
Z
AN6
In default configuration, this option header is not installed. Cut-
traces on the bottom of the PCB provide signal pathways. To iso-
late these analog inputs, simply open the cut-traces and install a
2x3, 0.1” pin header.
USER OPTIONS
The M52233DEMO includes various input and output devices to aid application development.
User I/O devices include 12 pushbutton switches, 4 green LEDs, and 1 potentiometer. The
table below summarizes user option connections on the development board.
