User Manual

ZSTAR3 Sensor Board Description
ZSTAR3 Reference Design Manual, Rev. 0.1
3-16 Freescale Semiconductor
Preliminary
Pr
e
l
i
m
i
n
a
ry
Figure 3-2. Sensor Board Block Diagram
Figure 3-3. - ZSTAR3 Sensor Board Software Overview shows in more detail, how different software
and hardware modules co-operate with each other. The main task of the Sensor Board is to:
• periodically wake-up from power saving mode
• measure all three XYZ acceleration values from the Sensor
• compose a data frame using simple ZSTAR3 RF Protocol
•use SMAC (Simple Media Access Controller) to send this data frame over the RF link
• go to sleep
This basic loop repeats roughly 30 times per second (period is 33.333ms) providing nearly a real-time
response from the Sensor.
MMA7450L
accelerometer
Power
MC13213
SIP - System in
Antenna
CR2032
Lithium battery
package
MCU + RF
MMA7360LT