M 5 2 2 2 1 D E M O U S E R G U I D E
J A N U A R Y 1 8 , 2 0 0 7
17
Refer to the MCF52223 RM for additional information on using the OTG Phy. Also refer to the
USB2.0 Specification and the On-the-Go Supplement to the USB2.0 Specification for addi-
tional information. The USB2.0 Specification and the OTG Supplement can be downloaded
from the USB Implementers Forum (USB-IF) at
www.usb.org
. These documents are also
available on the Axiom Manufacturing Support CD.
ACCELEROMETER
The M52221DEMO 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. The
SLEEP* input allows the device to be placed in a low-power mode. Separate (X/Y/Z) axis
readings are routed to the MCU
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-trace completes the 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 accelerometer. The table below
shows the signal connections to the MCU.
Table 3
: 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 M52221DEMO includes various input and output devices to aid application development.
User I/O devices include 2 pushbutton switches, 4 green LEDs, and 1 potentiometer. The ta-
ble below summarizes user option connections on the development board.
Table 4: User Option Connections
OPTION
MCU PORT
MCU PIN
SW1
IRQ7
58
SW2
IRQ1
56
LED1
DTIN0
22
LED2
DTIN1
23
LED3
DTIN2
18
LED4
DTIN3
19
RV1
AN0
25
