User Manual

ZSTAR3 Wireless Sensing Triple Axis Reference design Introduction
ZSTAR3 Reference Design Manual, Rev. 0.1
2-10 Freescale Semiconductor
Preliminary
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Figure 2-2. ZSTAR3 Block Diagram
2.2 Features of ZSTAR3
• Sensing of acceleration in 3 axes
• Handles digital and analogue sensors
• Wireless communication with sensors through the 2.4 GHz band
• RF protocol supports 16 sensors on one USB stick (receiver)
• STAR topology of RF network
• Data rate of a sensor is 30, 60 or 120 Hz
• Typical wireless range is 20 m, two walls or one floor
• Auto calibration function of the sensor
• USB communication on the receiver part
— Virtual serial port - interface for GUI and serial port terminal
— HID class - mouse for windows
— HID class – keyboard (game controller)
• 8-bit/16-bit working modes
• 3 push buttons on the sensor board
• Current consumption:
— in normal run mode: 1.8 - 3.9 mA, depends on the actual data rate
— in sleep mode: less than 900 nA
• Power consumption depends on the current output values of the sensor. At a standstill, the board
transmits only every 10th packet
• Sensor Board is powered by a coin-sized CR2032 3V battery
• Small size board fits a circular plastic box
MMA7360L
HC908JW32
MMA7450L
/
MC13213