Freescale's ZSTAR3 wireless sensor reference design supports digital and analog accelerometers and communicates with a USB node connected to a PC via the RF ZigBee® 2.4 GHz communication module. The main components in ZSTAR3 include three-axis analog Accelerometer MMA7361L, three-axis digital accelerometer MMA745xL and system-in-package (SiP) MC13213. This article introduces the main features of the main components of the ZSTAR3 wireless sensor reference design, the sensor board block diagram and the sensor board material list using analog sensors and digital sensors and ZSTAR3 Reference design circuit diagram.
MulTIple wireless sensing triple-axis reference design
The ZSTAR3 system accommodates mulTIple analog and digital accelerometer boards,
Connected through an RF ZigBee® 2.4 GHz communicaTIon to a single USB node connected to a PC. The accelerometer boards measure acceleraTIon in three axes using a pin compatible digital or, optionally, an analog sensor. The sensor sensitivity is defined by the selected accelerometer. The USB node is part of the ZSTAR design, equipped with dedicated software supporting multiple nodes.
The ZSTAR3 project offers a new PC software interface that shows all the basic accelerometer functions and utilizations. Freescale's RD3172MMA7456L ZSTAR3 can help you streamline your solution with the convenience of wireless control. The ZSTAR3 is a small portable board design that utilizes the following products :
MMA7361L analog or MMA7456L digital triple-axis accelerometer
MC1321x 2.4 GHz low-power transceivers and an S08 MCU in one package
Target application: The ZSTAR3 design provides small portable boards with the capacity to demonstrate and
Evaluate various accelerometer applications that accommodate a cost-effective, low-power wireless connection. Applications include:
Mobile phones
Handheld gaming devices
Portable media players
MP3 players
PDAs
Personal computer peripherals
GPS navigation devices
Health care devices
Toys
Robotics
Figure 1. ZSTAR3 reference design outline drawing
The main components supported by the ZSTAR3 reference design:
1) Three-axis analog accelerometer MMA7361L
The MM7361LT is a low power, low profile capacitive micromachined accelerometer featuring signal conditioning, a 1-pole low pass filter, temperature compensation, self test, 0g-detect which detects linear free-fall, and g-Select which allows for the selection between 2 sensitivities. Zero-g offset and sensitivity are factory set and require no external devices. The MM7361LT includes a sleep mode that makes it ideal for handheld battery powered electronics.
MMA7361L main features:
3mm x 5mm x 1.0mm LGA-14-pin package
Low current consumption: 400 μA
Sleep mode: 3 μA
Low voltage operation: 2.2 V - 3.6 V
High sensitivity (800 mV/g at 1.5g)
Fast turn on time (0.5 ms enable response time)
Self test for free-fall detect diagnosis
0g-Detect for free-fall protection
Signal conditioning with low pass filter
Robust design, high shocks survivability
RoHS compliant
Environmentally preferred product
Low cost
2) Three-axis digital accelerometer MMA745xL
The MMA745xL is a digital output (I2C/SPI), low power, 3 x 5 x 1 mm low profile package capacitive micromachined accelerometer featuring signal conditioning, a low pass filter, temperature compensation, self test, configured to detect 0g through interrupt pins ( INT1 or INT2), and pulse (click) detect for quick motion detection. The 0g offset can be customer calibrated using assigned 0g registers and g-Select which allows for command selection of 3 sensitivities (2g/4g/8g). Zero-g Offset and sensitivity are factory set and
Require no external devices. The MMA745xL includes a standby mode that makes it ideal for handheld battery powered electronics.
Main features of MMA745xL:
Digital output (I2C/SPI) for processor system performance
Low-profile 14-pin 3 mm x 5 mm x 1 mm LGA package
LGA volume is 71 percent smaller than a Quad Flat No-Lead (QFN) package
XYZ: three axes of sensitivity in one device (2g, 4g, 8g)
Low current consumption
Standby mode: 5 μA
Low-voltage operation: 2.4 V - 3.6 V
Customer assigned registers for offset calibration
Programmable threshold interrupt output
Level detection for motion recognition (shock, vibration, free-fall)
Single or double click (pulse) recognition
High sensitivity
— 64 LSB/g at 2g
— 64 LSB/g at 8g in 10-bit mode
3) System Level Package (SiP) MC13213
The MC13213 System in Package (SiP) integrates the MC9S08GT MCU with the MC1320x transceiver into a single 9x9mm LGA package. The MC13213 provides 60 K Flash memory and 4 K of RAM. By using the IEEE 802.15.4 Compliant MAC, or BeeStack ZigBee Protocol Stack, the MC13213 is an ideal solution for sensing and control applications that require mesh networking.
Main features of MC13213:
40 MHz HCS08 low-voltage, low-power core
60 KB Flash and 4KB RAM memory
Seven addressing modes for the CPU
Multiple 16-bit timers
2V to 3.4V operating voltage with on chip voltage regulator
-40 to +85 degrees C operating temperature
Low external component count
Requires a single 16 MHz crystal
Programmable frequency clock output for MCU
Auto-trim feature for Crystal accuracy
Eliminates the need for external variable capacitors
Allows for automated production frequency calibration
9x9x1 mm 71-pin LGA package
Figure 2. Sensor board block diagram. Table 1. Sensor board bill of materials (using analog sensors)
Table 2. List of sensor board materials (using digital sensors)
Figure 3. ZSTAR3 circuit diagram
MulTIple wireless sensing triple-axis reference design
The ZSTAR3 system accommodates mulTIple analog and digital accelerometer boards,
Connected through an RF ZigBee® 2.4 GHz communicaTIon to a single USB node connected to a PC. The accelerometer boards measure acceleraTIon in three axes using a pin compatible digital or, optionally, an analog sensor. The sensor sensitivity is defined by the selected accelerometer. The USB node is part of the ZSTAR design, equipped with dedicated software supporting multiple nodes.
The ZSTAR3 project offers a new PC software interface that shows all the basic accelerometer functions and utilizations. Freescale's RD3172MMA7456L ZSTAR3 can help you streamline your solution with the convenience of wireless control. The ZSTAR3 is a small portable board design that utilizes the following products :
MMA7361L analog or MMA7456L digital triple-axis accelerometer
MC1321x 2.4 GHz low-power transceivers and an S08 MCU in one package
Target application: The ZSTAR3 design provides small portable boards with the capacity to demonstrate and
Evaluate various accelerometer applications that accommodate a cost-effective, low-power wireless connection. Applications include:
Mobile phones
Handheld gaming devices
Portable media players
MP3 players
PDAs
Personal computer peripherals
GPS navigation devices
Health care devices
Toys
Robotics
Figure 1. ZSTAR3 reference design outline drawing
The main components supported by the ZSTAR3 reference design:
1) Three-axis analog accelerometer MMA7361L
The MM7361LT is a low power, low profile capacitive micromachined accelerometer featuring signal conditioning, a 1-pole low pass filter, temperature compensation, self test, 0g-detect which detects linear free-fall, and g-Select which allows for the selection between 2 sensitivities. Zero-g offset and sensitivity are factory set and require no external devices. The MM7361LT includes a sleep mode that makes it ideal for handheld battery powered electronics.
MMA7361L main features:
3mm x 5mm x 1.0mm LGA-14-pin package
Low current consumption: 400 μA
Sleep mode: 3 μA
Low voltage operation: 2.2 V - 3.6 V
High sensitivity (800 mV/g at 1.5g)
Fast turn on time (0.5 ms enable response time)
Self test for free-fall detect diagnosis
0g-Detect for free-fall protection
Signal conditioning with low pass filter
Robust design, high shocks survivability
RoHS compliant
Environmentally preferred product
Low cost
2) Three-axis digital accelerometer MMA745xL
The MMA745xL is a digital output (I2C/SPI), low power, 3 x 5 x 1 mm low profile package capacitive micromachined accelerometer featuring signal conditioning, a low pass filter, temperature compensation, self test, configured to detect 0g through interrupt pins ( INT1 or INT2), and pulse (click) detect for quick motion detection. The 0g offset can be customer calibrated using assigned 0g registers and g-Select which allows for command selection of 3 sensitivities (2g/4g/8g). Zero-g Offset and sensitivity are factory set and
Require no external devices. The MMA745xL includes a standby mode that makes it ideal for handheld battery powered electronics.
Main features of MMA745xL:
Digital output (I2C/SPI) for processor system performance
Low-profile 14-pin 3 mm x 5 mm x 1 mm LGA package
LGA volume is 71 percent smaller than a Quad Flat No-Lead (QFN) package
XYZ: three axes of sensitivity in one device (2g, 4g, 8g)
Low current consumption
Standby mode: 5 μA
Low-voltage operation: 2.4 V - 3.6 V
Customer assigned registers for offset calibration
Programmable threshold interrupt output
Level detection for motion recognition (shock, vibration, free-fall)
Single or double click (pulse) recognition
High sensitivity
— 64 LSB/g at 2g
— 64 LSB/g at 8g in 10-bit mode
3) System Level Package (SiP) MC13213
The MC13213 System in Package (SiP) integrates the MC9S08GT MCU with the MC1320x transceiver into a single 9x9mm LGA package. The MC13213 provides 60 K Flash memory and 4 K of RAM. By using the IEEE 802.15.4 Compliant MAC, or BeeStack ZigBee Protocol Stack, the MC13213 is an ideal solution for sensing and control applications that require mesh networking.
Main features of MC13213:
40 MHz HCS08 low-voltage, low-power core
60 KB Flash and 4KB RAM memory
Seven addressing modes for the CPU
Multiple 16-bit timers
2V to 3.4V operating voltage with on chip voltage regulator
-40 to +85 degrees C operating temperature
Low external component count
Requires a single 16 MHz crystal
Programmable frequency clock output for MCU
Auto-trim feature for Crystal accuracy
Eliminates the need for external variable capacitors
Allows for automated production frequency calibration
9x9x1 mm 71-pin LGA package
Figure 2. Sensor board block diagram. Table 1. Sensor board bill of materials (using analog sensors)
Table 2. List of sensor board materials (using digital sensors)
Figure 3. ZSTAR3 circuit diagram
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