Atmel-42156-WIRELESS-AT03911-REB233CBB-Module-User-Manual Application-Note

APPLICATION NOTE
Atmel AT03911: REB233CBB Module – User Manual
Atmel MCU Wireless
Features
•
REB233CBB Module targeted for IEEE 802.15.4®, ZigBee®, ZigBee RF4CE,
6LoWPAN and ISM applications
• Industry leading 101dB link budget
• Ulta-low current consumption
• Ultra-low supply voltage (1.8V to 3.6V)
•
•
Hardware supported antenna diversity
Board information EEPROM
• MAC address
• Board identification, features, and serial number
•
Powered by two AAA batteries for stand-alone operation
Introduction
This manual introduces the Atmel® REB233CBB Module, a module consisting of an
Atmel AT86RF233 radio transceiver and Atmel ATxmega256A3 microcontroller
forming a fully functional wireless node. Detailed information is given in the individual
sections about the REB233CBB Module assembly, functionality, interfaces, and
usage.
Figure 1-1. REB233CBB Module.
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Table of Contents
2. Disclaimer .......................................................................................... 3
3. Overview ............................................................................................ 3
4. Assembly instructions ........................................................................ 3
4.1
4.2
Delivery state .................................................................................................... 3
Preparing the REB233CBB Module .................................................................. 3
5. Functional description ........................................................................ 4
5.2
5.3
5.4
5.5
5.6
5.7
5.8
Radio PCB ........................................................................................................ 5
Antennas ........................................................................................................... 5
Microcontroller PCB .......................................................................................... 5
Power Supply .................................................................................................... 5
LEDs and buttons.............................................................................................. 5
UART/USART ................................................................................................... 5
ID EEPROM ...................................................................................................... 6
6. Mechanical description ....................................................................... 7
7. Firmware description .......................................................................... 8
7.1
7.2
Range measurement......................................................................................... 8
7.1.1
Power up the modules ........................................................................ 8
7.1.2
Run range measurement application .................................................. 8
Packet error rate measurement......................................................................... 8
7.2.1
Module preparation ............................................................................. 8
7.2.2
Driver installation ................................................................................ 9
7.2.3
Set up the terminal program on the host-PC....................................... 9
7.2.4
Power up REB233CBB Modules ........................................................ 9
7.2.5
Run the packet error rate measurement ............................................. 9
8. Electrical characteristics ................................................................... 10
8.1
8.2
8.3
8.4
Absolute maximum ratings .............................................................................. 10
Recommended operating range ...................................................................... 10
Current consumption ....................................................................................... 10
Duty cycle requirements.................................................................................. 11
Appendix A.
Abbreviations ............................................................... 12
Appendix B.
Radio certification ........................................................ 13
B.1
B.2
B.3
United States (FCC) ........................................................................................ 13
Europe (ETSI) ................................................................................................. 14
Approved antenna ........................................................................................... 14
Appendix C.
References .................................................................. 15
Appendix D.
Revision History ........................................................... 16
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2.
Disclaimer
Typical values contained in this application note are based on simulations and testing of individual examples.
Any information about third-party materials or parts was included in this document for convenience. The vendor may
have changed the information that has been published. Check the individual vendor information for the latest changes.
3.
Overview
The REB233CBB Module is a compact solution providing wireless connectivity between IEEE 802.15.4/ZigBee
compliant devices. The module is compliant to EU and US regulatory requirements.
The REB233CBB Module is an ideal platform to:
• Become familiar with a ready-to-use radio product by Atmel
• No configuration required for out-of-box experience
• Evaluate the outstanding REB233CBB Module performance, such as
• Excellent receiver sensitivity achieved at ultra-low current consumption
• Performance improvements and robustness by operating antenna diversity
• Test the REB233CBB Module hardware support of the IEEE 802.15.4 standard [1]
4.
Assembly instructions
4.1
Delivery state
The REB233CBB Module is delivered in dismounted state. Figure 4-1 shows the Microcontroller PCB with batteries
inserted, the Radio PCB and two swivel antennas.
Figure 4-1. REB233CBB Module delivery state
4.2
Preparing the REB233CBB Module
Follow these steps to setup the REB233CBB Module for correct operation:
1.
2.
3.
4.
Check or set the power switch off at the Microcontroller PCB.
Insert the two delivered batteries and check for correct polarization.
The RF-Shielding of the Radio PCB must be faced to the battery holder of the Microcontroller PCB. Plug in the
Radio PCB header ‘X1’ into the Microcontroller PCB socket ‘Expand 1’.
The swivel antennas provided with the REB233CBB Module are tested and approved (see A.3). One antenna
must be mounted on each SMA coaxial connector ‘X2’ and ‘X3’ port of the Radio PCB.
Note, to ensure compliance, the use of any other antenna type is not permitted, see A.3.
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5.
Functional description
The block diagram of the REB233CBB Module is shown in Figure 5-1. The Radio PCB and Microcontroller PCB are
connected via a mounting header. The Radio PCB is not functional without connecting it correctly to the Microcontroller
PCB. The Radio PCB is equipped with two approved antennas; see A.3 and [2], to enable antenna diversity (AD)
operation.The Microcontroller PCB controls the Radio PCB, provides the power supply as well as the user interface. The
user interface consists of three LEDs and two pushbuttons for manual user control of the module. Additional
microcontroller (MCU) GPIOs, like USART, UART and JTAG, are available to control the module with a host-PC.
Figure 5-1. REB233CBB Module block diagram
ANT1
Battery
SMA1
RF1
GPIO
Switch
RF
AT86RF233
Interface
ATxmega256A3
SPI
SMA2
LEDs
RF2
Buttons
ANT2
Radio PCB
Microcontroller PCB
User Interface
The two REB233CBB Module components, the Radio PCB, equipped with two swivel antennas, and Microcontroller
PCB, are shown in detail in Figure 5-2. Here, the REB233CBB Module is dismounted for better explanation of all
important hardware features.
Figure 5-2. REB233 Module features (dismounted view for better description)
Radio PCB
ANT1
Microcontroller PCB
ANT2
Power switch
Battery holder
GPIOs
SMA1
OFF
ON
SMA2
UART
Mounting header
LEDs
Buttons
JTAG
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5.2
Radio PCB
The Radio PCB carries the radio transceiver AT86RF233 [3]. The radio transceiver is a high performance RF-CMOS
2.4GHz radio transceiver targeted for IEEE802.15.4, ZigBee, RF4CE, 6LoWPAN, and ISM applications. The
identification EEPROM carries Radio PCB information used by the Microcontroller PCB.
5.3
Antennas
The antennas intended for the REB233CBB Module, see A.3 and [2], are to be connected to the SMA connectors on the
Radio PCB. A proper antenna orientation can enhance the radio link budget. Especially an orthogonal orientation
between the two antennas, see Figure 6-1, decreases the probability of RF signal extinction.
5.4
Microcontroller PCB
The Microcontroller PCB carries the ATxmega256A3 MCU [4]. The MCU is a high-performance, low-power 8/16-bit
Atmel AVR® XMEGA® MCU with 256KB in-system, self-programmable flash, 8KB boot code section with independent
lock bits, 16KB internal SRAM and 4KB EEPROM.
5.5
Power Supply
The REB233CBB Module is powered by two AAA batteries. The power switch disconnects batteries from the entire
board. External power is not routed through the power switch.
Note:
There is no protection against over-voltage.
5.6
LEDs and buttons
For simple applications, and to provide status information, a user interface is provided on-board, consisting of three
LEDs and two pushbuttons
The LEDs (D1…D3) are connected to PB0..2 for active-high operation, whereas the pushbutton (T1) pulls PB3 to GND.
The second pushbutton (RESET) is connected to the MCUs reset pin.
Table 5-1.
5.7
LED/Button connection
ATxmega256A3
I/O
ATxmega256A3
I/O
PB0 (6)
D1
PB3 (9)
T1
PB1 (7)
D2
RESET
T2
PB2 (8)
D3
UART/USART
The signal lines for asynchronous serial operation of the Atmel ATxmega256A3 (USARTD0) are connected to header
USARTD0. In addition, the MCU reset line is connected to pin 5 of this header. This can be used to work with a serial boot
loader. No level conversion is done; therefore, an external RS232/TTL conversion circuit is required.
The header pin-out mates with the available RS232/TTL converter in Figure 5-3.
Table 5-2.
Connection of USARTD0
ATxmega256A3
Header USARTD0
Description
PD2 (28)
RxD (4)
Asynchronous serial in
PD3 (29)
TxD (1)
Asynchronous serial out
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ATxmega256A3
Header USARTD0
Description
RESET (57)
RESET (5)
MCU reset
VTG (2)
Operating voltage
GND (6)
Ground
Synchronous operation is not supported.
PC connectivity can be easily achieved by using a serial to USB level shifter stick [8] as shown in Figure 5-3.
Figure 5-3. USB level shifter stick.
5.8
ID EEPROM
The REB233CBB Module identifies the Radio PCB by checking the correct content of the Radio PCB identification (ID)
EEPROM, which handles information about the Radio PCB, the node MAC address and production calibration values.
This ensures no other Radio PCB type can be used in conjunction with the delivered Microcontroller PCB and firmware.
The firmware running on the Microcontroller PCB checks the correct content of the Radio PCB ID-EEPROM before
continuing with any radio operation. In case of wrong or unexpected content of the Radio PCB ID-EEPROM the
operation is stopped which is indicated by LEDs D1…D2 blinking.
Table 5-3 shows a detailed description of the Radio PCB ID-EEPROM data structure.
Table 5-3.
ID EEPROM mapping.
Address
Name
Type
Description
0x00
MAC address
uint64
MAC address for the 802.15.4 node, little endian byte order
0x08
Serial number
uint64
Board serial number, little endian byte order
0x10
Board family
uint8
Internal board family identifier
0x11
Revision
uint8[3]
Board revision number ##.##.##
Board features, coded into seven bits
0x14
Feature
uint8
7
Reserved
6
Reserved
5
External LNA
4
External PA
3
Reserved
2
Diversity
1
Antenna
0
SMA connector
0x15
Cal OSC 16MHz
uint8
RF233 XTAL calibration value, register XTAL_TRIM
0x16
Cal RC 3.6V
uint8
Atmel ATxmega256A3 internal RC oscillator calibration value @ 3.6V
0x17
Cal RC 2.0V
uInt8
Atmel ATxmega256A3 internal RC oscillator calibration value @ 2.0V
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Address
Name
Type
Description
0x18
Antenna gain
Int8
Antenna gain [resolution 1/10dBi]. For example, 15 will indicate a gain of
1.5dBi. The values 00h and FFh are per definition invalid. Zero or -0.1dBi
has to be indicated as 01h or FEh
0x20
Board name
Char[30]
Textual board description
0x3E
CRC
Uint16
16-bit CRC checksum, standard ITU-T generator polynomial G16(x) = x
12
5
+x +x +1
16
Note:
MAC addresses used for this product are Atmel property. The use of these MAC addresses for development purposes
is permitted.
6.
Mechanical description
The mechanical dimensions of the REB233CBB Module are decribed in Figure 6-1 and Table 6-1.
Figure 6-1. REB233CBB Module with vertical (1) and horizontal (2) antenna position
(1)
(2)
(L)
Table 6-1.
(W)
REB233CBB Module mechanical dimensions
Dimension
Value
Length (L)
57mm
Width (W)
60mm
Height with vertical antenna position (1)
110mm
Height with horizontal antenna position (2)
70mm
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7.
Firmware description
7.1
Range measurement
The REB233CBB Module is pre-flashed with the RF performance test suite featuring a range measurement application.
Each module operates in a standalone manner, and is able to transmit or receive data frames. A successful transmit or
receive operation is indicated by a blinking LED.
7.1.1
Power up the modules
Apply power to both modules by switching on the power switch. In consequence of, a module runs a power-on check
and indicates the successful completion by switching on the second of the three LEDs.
7.1.2
Run range measurement application
Select one of the REB233CBB Module and press pushbutton T1 to start the range measurement application.
First, the module initiates a connection and configuration procedure by sending broadcast frames and waiting for a
response from the second module. After successful configuration, the module turns on LED-D1 indicating this status.
The initiator starts transmitting data frames. Each data frame transmission is indicated by blinking the TX status LEDD2. A successful data frame reception on the second node is indicated by blinking the RX status LED-D3. The frame
transmit repetition rate is fixed to ensure FCC compliance; the repetition rate cannot be changed.
The RX status LED stops blinking if no data frames are received, such as when, for example, the node has left the
communication range. Data frame transmission can be stopped by pressing T1 once more on the node transmitting
frames.
The REB233CBB Modules are able to transmit and receive simultaneously. Pressing pushbutton T1 on both nodes
initiates each node to transmit frames. Operating modes are indicated as: LED-D1 a successful start-up, LED-D2 in
transmit and LED-D3 in receive mode.
Note:
The node configuration gets lost when resetting or switching off the radio modules power supply; to restart, a reset or
power cycle is required for both REB233CBB Modules before pressing T1 on one (or both) REB233CBB Module(s).
7.2
Packet error rate measurement
The RF performance test suite features a packet error rate measurement (as defined by IEEE802.15.4), and allows to
explore various radio transceiver features, radio transceiver registers, and performance by tuning with customized
configurations. For this application, at least one REB233CBB Module needs to be connected to a PC.
7.2.1
Module preparation
1. Prepare REB233CBB Modules as described in Chapter 4.2.
2. Make sure that the power switch on both modules is in the off position.
3. Plug an USB level-shifter into a free USB port on your host-PC. Interconnect
this adapter and one of the REB233CBB Modules via the 6-pin ribbon cable
so that it fits the notch on the adapter and the colored stripe of the ribbon
cable connects to pin 1 of the header USARTD0.
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7.2.2
Driver installation
Download the USB adapter drivers from http://www.dresden-elektronik.de/shop/prod152.html?language=en,
‘Downloads’ tab and extract the archive to a folder of your selection. If the ‘New Hardware Found’ wizard prompts for
drivers ignore Windows® update search (‘No, not this time’). In the next dialog, select ‘Install from a list
or a specific location’ and point at the extraction directory. Confirm installation, ignore warnings that the driver
is not digitally signed or did not pass the Windows driver certification.
If no wizard pops up, install drivers manually via the device manager.
Note:
The driver installation needs to be performed twice.
7.2.3
Set up the terminal program on the host-PC
A terminal program running on the host-PC is used to control the application running on the REB233CBB Modules.
Set up the terminal program as follows:
COM PORT:
BAUD RATE:
PARITY:
DATA BITS:
STOP BITS:
FLOW CONTROL:
7.2.4
Select COM port assigned during USB adapter driver installation
9600
None
8
1
Off
Power up REB233CBB Modules
Apply power to both (optional one) modules by switching on the power switch. The modules run a power-on check, and
indicate the successful completion by switching on LED-D2.
7.2.5
Run the packet error rate measurement
Type any character in the terminal window (Figure 7-1) to initiate the configuration procedure for a REB233CBB
Module. Optionally, if no peer node is active, the search for a peer device can be aborted by pressing ENTER to
configure the module stand-alone operation. The packet error rate measurement can be operated through the menu
options displayed on the UART terminal program.
Figure 7-1. Terminal window
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8.
Electrical characteristics
8.1
Absolute maximum ratings
Stresses beyond the values listed in Table 8-1 may cause permanent damage to the board. This is a stress rating only
and functional operation of the device at these or any other conditions beyond those indicated in the operational
sections of this manual are not implied. Exposure to absolute maximum rating conditions for extended periods may
affect device reliability. For more details about these parameters, refer to individual datasheets of the components used.
Table 8-1.
Absolute maximum ratings.
No.
Parameter
7.1.1
Storage temperature range
7.1.2
Humidity
7.1.3
Supply voltage
-0.3
+3.6
V
7.1.4
EXT I/O pin voltage
-0.3
VCC + 0.3
V
7.1.5
Supply current from batteries
+70
A
7.1.6
Condition
Minimum
-40
Non-condensing
Sum over all power pins
(1)
Battery Charge current
1.
8.2
Recommended operating range
Table 8-2.
Maximum
Unit
+85
°C
90
% r.H.
0
Note:
mA
Keep power switch off or remove battery from REB233CBB Module when external power is supplied.
Recommended operating range.
No.
Parameter
Condition
7.2.1
Operating temperature range
Crystal within ±40ppm
-10
7.2.2
Supply voltage (VCC)
Default
1.8
Serial flashaccess in usage
2.3
7.2.2
8.3
Typical
Minimum
Typical
Maximum
Unit
+60
°C
3.0
3.6
V
3.0
3.6
V
Current consumption
Test conditions (unless otherwise stated):
VDD = 3.0V, TOP = 25°C
Table 8-3 lists current consumption values for typical scenarios of the REB233CBB Module.
Table 8-3.
No.
7.3.1
Current consumption of REB233CBB Module
Parameter
Condition
(1)
Supply current
(1)
7.3.2
Supply current
7.3.3
Supply current
(1)
Minimum
Typical
MCU @ power down,
transceiver in state SLEEP,
serial flash in Deep-Sleep
17
MCU @ 2MHz,
transceiver in state TRX_OFF
3
MCU @ 16MHz (int. RC 32MHz),
transceiver in state TRX_OFF
15
Maximum
Unit
µA
mA
mA
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No.
Parameter
Condition
(1)
7.3.4
Supply current
7.3.5
Supply current
(1)
28
MCU @ 16MHz (int. RC 32MHz),
transceiver in state BUSY_TX
26
1.
8.4
Duty cycle requirements
Unit
mA
mA
TX operating condition.
Parameter
7.4.1
TX Duty Cycle OQPSK
1.
Maximum
Measurement results with diode D1 removed.
No.
Note:
Typical
MCU @ 16MHz (int. RC 32MHz),
transceiver in state RX_ON
Note:
Table 8-4.
Minimum
Condition
(1)
over 100ms
IEEE802.15.4 channel 26
Minimum
Typical
Maximum
31
Unit
%
To ensure FCC compliant operation in IEEE802.51.4 channel 26, the TX duty cycle has to be equal or below the
specified maximum value under normal and extreme conditions. The duty cycle for other channels is not restricted.
For further details refer to VNR-E33SD-X5B-00 FCC test report.
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Appendix A.
Abbreviations
AD
-
Antenna diversity
CRC
-
Cyclic redundancy check
ETSI
-
European Telecommunications Standards Institute
FCC
-
Federal Communications Commission
ISM
-
Industrial, scientific and medical (frequency band)
MAC
-
Medium access control
MCU
-
Microcontroller
PER
-
Packet error rate
R&TTE
-
Radio and Telecommunications Terminal Equipment
(Directive of the European Union)
RF
-
Radio frequency
RX
-
Receiver
SMA
-
Sub-miniature-A (connection)
SPI
-
Serial peripheral interface
TX
-
Transmitter
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Appendix B.
Radio certification
The device REB233CBB Module, consisting of:
1.
2.
3.
4.
Radio PCB (REB233SMAD v8.1.0) assembled with
Two 2.4GHz Omni Rubber Antennas M35-S [2], mounted on a
Microcontroller PCB (Controller Base Board (CBB)), which hosts an application firmware available with
Atmel AVR2025: IEEE 802.15.4 MAC Software Package [7],
Only this combination of components and assembled as described in Section 4 has received regulatory approvals for
modular devices in the United States and European countries. The REB233CBB Module is shown in Figure 1-1.
B.1
United States (FCC)
Compliance Statement (Part 15.19)
The device complies with Part 15 of the FCC rules. To fulfill FCC Certification requirements, an Original Equipment
Manufacturer (OEM) must comply with the following regulations:
• The modular transmitter must be labeled with its own FCC ID number, and, if the FCC ID is not visible when
the module is installed inside another device, the outside of the device into which the module is installed must
also display a label referring to the enclosed module
• This exterior label can use wording such as the following. Any similar wording that expresses the same
meaning may be used
Contains FCC-ID: VNR-E33SD-X5B-00
This device complies with Part 15 of the FCC Rules. Operation is subject to the following
two conditions: (1) this device may not cause harmful interference, and (2) this device must
accept any interference received, including interference that may cause undesired
operation.
Use in portable exposure conditions (FCC 2.1093) requires separate equipment authorization. Modifications not
expressly approved by this company could void the user's authority to operate this equipment (FCC Section 15.21).
Compliance Statement (Part 15.105(b))
This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of
the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential
installation. This equipment generates uses and can radiate radio frequency energy and, if not installed and used in
accordance with the instructions, may cause harmful interference to radio communications. However, there is no
guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to
radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to
try to correct the interference by one or more of the following measures:
•
•
•
•
Reorient or relocate the receiving antenna
Increase the separation between the equipment and receiver
Connect the equipment into an outlet on a circuit different from that to which the receiver is connected
Consult the dealer or an experienced radio/TV technician for help
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Warning:
IMPORTANT FCC NOTICE to USERS
Changes or modifications not expressly approved by this company could void the user’s authority to operate the
equipment.
B.2
Europe (ETSI)
If the device is incorporated into a product, the manufacturer must ensure compliance of the final product to the
European harmonized EMC and low-voltage/safety standards. A Declaration of Conformity must be issued for each of
these standards and kept on file as described in Annex II of the R&TTE Directive.
The manufacturer must maintain a copy of the device documentation and ensure the final product does not exceed the
specified power ratings, and/or installation requirements as specified in the user manual. If any of these specifications
are exceeded in the final product, a submission must be made to a notified body for compliance testing to all required
standards. The “CE“ marking must be affixed to a visible location on the OEM product. The CE mark shall consist of the
initials "CE" taking the following form:
• If the CE marking is reduced or enlarged, the proportions given in the above graduated drawing must be
respected
• The CE marking must have a height of at least 5mm except where this is not possible on account of the nature
of the apparatus
• The CE marking must be affixed visibly, legibly, and indelibly
More detailed information about CE marking requirements you can find at "DIRECTIVE 1999/5/EC OF THE
EUROPEAN PARLIAMENT AND OF THE COUNCIL" on 9 March 1999 at section 12.
B.3
Approved antenna
The device has been tested and approved for use with the antenna type listed below. The device may be integrated
with other custom design antennas which OEM installer must authorize with respective regulatory agencies. The used
antenna is to be connected to the Radio PCB via an SMA connection.
Table 8-5.
Approved antenna.
Manufacturer
Description
Model
Frequency
Connector
TEKFUN Co.
¼-wave swivel SMA Male
antenna
M35-S
2400MHz
Male SMA
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Appendix C.
References
[1] IEEE Std 802.15.4™-2011: Wireless Medium Access Control (MAC) and Physical Layer (PHY) Specifications
for Low-Rate Wireless Personal Area Networks (LR-WPANs)
[2] M35-S; Swivel SMA Male antenna for 2.4GHz; Technical specification;
http://www.tekfun.com.tw/product.php?mode=show&cid=28&pid=255; TEKFUN CO., LTD.
[3] AT86RF233; Ultra-low Power, 2.4GHz Transceiver for ZigBee, IEEE 802.15.4, 6LoWPAN, RF4CE, SP100,
Wireless HART and ISM Applications; Datasheet doc. no. 8351; Atmel Corporation
[4] Atmel ATxmega256A3; High-performance, Low-power 8/16-bit AVR XMEGA Microcontroller; datasheet; rev.
8068P – 02/10; Atmel Corporation
[5] FCC Code of Federal Register (CFR); Part 47; Section 15.35, Section 15.205, Section 15.209, Section 15.232,
Section 15.247, and Section 15.249. United States.
[6] ETSI EN 300 328, Electromagnetic Compatibility and Radio Spectrum Matters (ERM); Wideband Transmission
Systems; Data transmission equipment operating in the 2.4GHz ISM band and using spread spectrum
modulation techniques; Part 1-3.
[7] Atmel AVR2025: IEEE 802.15.4 MAC Software Package – User Guide; Application Note doc. no. 8412; Atmel
Corporation
[8] USB Level Shifter Stick Basic; datasheet; 03/12; Dresden Elektronik Ingenieurtechnik GmbH
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Appendix D.
Revision History
Version
Description
42156A
Initial revision
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