RD3172MMA7455L Freescale Semiconductor, RD3172MMA7455L Datasheet - Page 50

• 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

Software Design
5.4
ZSTAR3 USB Protocol - Extended STAR Protocol
The ZSTAR3 demo uses a subset of the original ZSTAR demo protocol commands. The Original ZSTAR
is built on the STAR demo protocol. This way, most of the software originally developed for the
RD3152MMA7260Q (ZSTAR) and RD3112MMA7260Q (STAR) is also usable with the ZSTAR3 demo.
The STAR demo communicates over the RS232 serial line with a simple text-based protocol. The same
protocol is used in ZSTAR/ZSTAR3 for communication between the USB stick and a PC (over a virtual
serial port). The PC application sees the same interface (serial port) and the same protocol as if a STAR
demo was connected. The ZSTAR3 uses extended STAR/ZSTAR protocol to provide all the new features.
Because the ZSTAR3 can serves up to 16 connected sensor boards, all commands that work with the sensor
boards are communicated with one selected board by the ‘N’ command from
Section 5.4.3, Subset of
Newly Added ZSTAR3 Protocol
Commands.
5.4.1
Subset of Original STAR Protocol Commands
The ZSTAR3 software contains all unchanged original STAR commands. Some commands can send
extended information in the ZSTAR3 mode - the ZSTAR3 USB protocol extends some original commands
when the PC sends any command from a new subset of the command table. This extended information
returns to the PC information resulting from individual commands.
Table 5-4. Legend of Colors
Legend
Red
Direction PC -> USB stick
Blue
Direction USB stick -> PC, regular data
Magenta
Direction USB stick -> PC, extended data
DRM103, Rev. 2
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Freescale Semiconductor