RD3172MMA7455L Freescale Semiconductor, RD3172MMA7455L Datasheet - Page 43

• Manufacturer Part Number: RD3172MMA7455L
• Description: EVAL BOARD FOR MMA7455L
• Manufacturer: Freescale Semiconductor
• Series: ZSTAR3r

Specifications of RD3172MMA7455L

• Design Resources: ZSTAR3 Schematic
• Sensor Type: Accelerometer, 3 Axis
• Sensing Range: ±2g, 4g, 8g
• Interface: RF
• Sensitivity: 16, 32, 64 LSB/g
• Voltage - Supply: 3V
• Embedded: Yes, MCU, 16-Bit
• Utilized Ic / Part: MMA7455
• Acceleration: 5000 g
• Sensing Axis: Triple Axis
• Output Type: Digital
• Interface Type: I2C, SPI
• Operating Voltage: 3.6 L
• Operating Current: 490 uA
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With/related Products: MMA7455L

5.3.2
The ZSTAR Zpacket is contained inside the MC1319x/MC1321x standard packet structure, which is
consistent with the IEEE 802.15.4 Standard. The SMAC library transparently adds a 16 bit Packet control
field (see chapter 7.2.1.1 of IEEE 802.15.4 Standard specifications) to differentiate packets from ZigBee
and other standards.
The Zpacket becomes a payload data for the SMAC standard packet and contains the following fields:
5.3.2.1
The ZSTAR3 uses for RF network identification an ID number called the NetNum. It is placed in FLASH
memory of each participant of the ZSTAR3 RF protocol. The USB stick randomly generates it at the first
time of its life cycle and it can be changed by a command from the PC. The sensor board has this number
erased from manufacture and it is set up with the first valid packet received in the ZSTAR3 RF protocol
format. The network number in the sensor board can be cleared by pressing all the buttons together during
a board wake-up sequence or by a command from the USB stick. Packets with different Network numbers
are simply ignored.
This field is 16 bits long.
Freescale Semiconductor
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Preamble
Section 5.3.2.1, Network Number (NetNum)
Section 5.3.2.2, RX Strength
Section 5.3.2.3, Zcommand
Section 5.3.2.4, Zdata
Network number
Zpacket Format
Network Number (NetNum)
SFD
MC1319x/MC1321x Packet Structure
strength
FLI
Packet control
RX
field
Figure 5-1. Zpacket Format
SMAC Packet Structure
ZSTAR3 Zpacket Structure
Zcommand
DRM103, Rev. 2
Payload Data
SMAC payload
Zdata
SFD (Start of Frame Delimiter)
FLI (Frame Length Indicator)
FCS (Frame Check Sequence)
Software Design
FCS
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