MCF5441X Tower Module Hardware Specification
Page 12 of 31
Figure 1 - MMA7361L Connection Diagram
By default the control signals are not connected, but can be enabled using Cut-Trace pads. By default
the MMZ7361L is configured to operate in normal mode with 1.5g sensitivity and no self test
functionality.
The MMA7361L Accelerometer is connected as follows to the MCF54418 MPU:
Accelerometer
MCF54418
Configuration
Cut-Trace Pad
X
OUT
ADC_IN0
CT3
Y
OUT
ADC_IN1
CT6
Z
OUT
ADC_IN2
CT9
g-Select
PST[0]/GPIO2
CT7
nSleep
PST[1]/GPIO3
CT12
Self Test
PST[2]/GPIO4
CT4
0g-Detect
PST[3]/GPIO5
CT10
Table 7 - Accelerometer Connection to MCF54418
By default the analog signals from the accelerometer are connected to the ADC channels 0-2 of the
MCF54418. If desired the connection to the accelerometer can be disconnected and the ADC channels
of the MCF54418 can be connected to the edge connectors for use on a module connected to the
TWR-ELEV.
To change the connection of ADC 0, 1, and 2 use the Cut-Trace pads CT3, CT6, and CT9 respectively.
Using a tool with a razor blade tip sever the connection between the pads 1 and 2 of each required
Cut-Trace implementation. Using a solder iron make a connection between pad 1 and pad 3.
By default the control signals for the MMA7361L accelerometer are not connected to the MCF54418.
To change the connection of the control signals (G-Select, nSleep, Self Test, and 0g-Detect) use the
respective Cut-Trace pads: CT7, CT12, CT4, and CT10. Using a solder iron create a connection between
pads 1 and 3.
Note that it is not possible to disconnect the default signals routing (PST[3:0]) for the these signals,
they are used for OSBDM functionality.
For more details regarding the Cut-Trace pad options and the pad numbering refer to the Cut-Trace
Pad section of this document.
4.9
Potentiometer
The TWR-MCF5441X includes an on-board potentiometer to allow the user to simulate an analog
input.
