5.1Ordering Information ........................................................................................................ 5-25
ZigBit™ 2.4 GHz Wireless Modulesi
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1.1Summary
ZigBit™ is an ultra-compact, low-power, high-sensitivity 2.4 GHz IEEE 802.15.4/ZigBee® OEM module
based on the innovative Atmel’s mixed-signal hardware platform. It is designed for wireless sensing,
control and data acquisition applications. ZigBit modules eliminate the need for costly and time-consuming RF development, and shortens time to market for a wide range of wireless applications.
Two different versions of 2.4 GHz ZigBit modules are available: ATZB-24-B0 module with balanced RF
port for applications where the benefits of PCB or external antenna can be utilized and ATZB-24-A2
module with dual chip antenna satisfying the needs of applications requiring integrated, small-footprint
antenna design.
1.2Applications
ZigBit module is compatible with robust IEEE 802.15.4/ZigBee stack that supports a self-healing, selforganizing mesh network, while optimizing network traffic and minimizing power consumption. Atmel
offers two stack configurations: BitCloud and SerialNet. BitCloud is a ZigBee PRO certified software
development platform supporting reliable, scalable, and secure wireless applications running on Atmel’s
ZigBit modules. SerialNet allows programming of the module via serial AT-command interface.
Section 1
Introduction
The applications include, but are not limited to:
•
Building automation & monitoring
– Lighting controls
– Wireless smoke and CO detectors
– Structural integrity monitoring
• HVAC monitoring & control
• Inventory management
• Environmental monitoring
• Security
• Water metering
• Industrial monitoring
– Machinery condition and performance monitoring
– Monitoring of plant system parameters such as temperature, pressure, flow, tank level, humidity,
vibration, etc.
• Automated meter reading (AMR)
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1.3Key Features
• Ultra compact size (24 x 13.5 x 2.0 mm for ATZB-24-A2 module and 18.8 x 13.5 x 2.0 mm for ATZB-24-B0
module)
• Innovative (patent-pending) balanced dual chip antenna design with antenna gain of approximately 0 dBi
(for ATZB-24-A2 version)
• High RX sensitivity (-101 dBm)
• Outperforming link budget (104 dB)
• Up to 3 dBm output power
• Very low power consumption:
– < 6 µA in Sleep mode,
– 19 mA in RX mode,
– 18 mA in TX mode
• Wide range of interfaces (both analog and digital):
– 9 spare GPIO, 2 spare IRQ lines
– 4 ADC lines + 1 line for supply voltage control (up to 9 lines with JTAG disabled)
– UART with CTS/RTS control
–USART
2
–I
– SPI
–1-Wire
– Up to 30 lines configurable as GPIO
– Capability to write own MAC address into the EEPROM
– Optional antenna reference designs
– IEEE 802.15.4 compliant transceiver
– 2.4 GHz ISM band
– BitCloud embedded software, including serial bootloader and AT command set
Introduction
C
1.4Benefits
• Small physical footprint and low profile for optimum fit in even the smallest of devices
[2] Atmel Low-Power Transceiver for ZigBee Applications. AT86RF230 datasheet. doc5131.pdf
[3] IEEE Std 802.15.4-2003 IEEE Standard for Information technology - Part 15.4 Wireless Medium
Access Control (MAC) and Physical Layer (PHY) Specifications for Low-Rate Wireless Personal Area
Networks (LR-WPANs)
[4] ZigBee Specification. ZigBee Document 053474r17, October 19, 2007
ZigBit is a low-power, high-sensitivity IEEE 802.15.4/ ZigBee-compliant OEM module. This multi-functional device occupies less than a square inch of space, which is comparable to a typical size of a single
chip. Based on a solid combination of Atmel’s latest MCU Wireless hardware platform [1], the ZigBit
offers superior radio performance, ultra-low power consumption, and exceptional ease of integration.
Figure 2-1. ATZB-24-B0 Block Diagram
Section 2
Zigbit™ Module Overview
Figure 2-2. ATZB-24-A2 Block Diagram
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Zigbit™ Module Overview
ZigBit modules comply with the FCC (Part 15), IC and ETSI (CE) rules applicable to the devices radiating in uncontrolled environment. For details, see “Agency Certifications” on page 4-22.
ZigBit fully satisfies the requirements of the “Directive 2002/95/EC of the European Parliament and the
Council of 27January 2003 on the restriction of the use of certain hazardous substances in electrical and
electronic equipment” (RoHS). Atmel provides fully compliant product in all regions where the directive is
enforced since July 1, 2006.
ZigBit contains Atmel’s ATmega1281V Microcontroller [1] and AT86RF230 RF Transceiver [2]. The module features 128 Kbytes flash memory and 8 Kbytes RAM.
The ZigBit already contains a complete RF/MCU-related design with all the necessary passive components included. The module can be easily mounted on a simple 2-layer PCB. Compared to a custom
RF/MCU design, a module-based solution offers considerable savings in development time and NRE
cost per unit during the design, prototyping, and mass production phases of product development.
Innovative (patent-pending) dual chip antenna design in ATZB-24-A2 module eliminates the balun and
achieves good performance over 2.4 GHz frequency band.
To jumpstart evaluation and development, Atmel also offers a complete set of evaluation and development tools. The ZigBit Development Kit [6] (ATZB-DK-24) comes with everything you need to create
custom applications featuring ZigBit module.
The kit features MeshBean development boards with an easy-to-access extension connector for attaching third party sensors and other peripherals, and a JTAG connector for easy application uploading and
debugging.
The kit also includes reference applications to speed up application development, source code for hardware interface layer and reference drivers for the all the module interfaces, intuitive development
environment from Atmel, and comprehensive set of application notes and product documentation.
ZigBit modules comes bundled with BitCloud, a 2
nd
generation embedded software stack from Atmel.
BitCloud is fully compliant with ZigBee PRO and ZigBee standards for wireless sensing and control [3],
[4], [5] and it provides an augmented set of APIs which, while maintaining 100% compliance with the
standard, offer extended functionality designed with developer's convenience and ease-of-use in mind.
Depending on end-user design requirements, ZigBit can operate as a self-contained sensor node, where
it would function as a single MCU, or it can be paired with a host processor driving the module over a
serial interface. In the former case, a user application may be used with the BitCloud software allowing
customization of embedded applications through BitCloud’s C API.
In the latter case, the host processor controls data transmission and manages module peripherals via an
extensive set of SerialNet AT commands. Thus, no firmware customization is required for a successful
module design-in. Additionally, third-party sensors can be connected directly to the module, thus
expanding the existing set of peripheral interfaces.
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3.1Electrical Characteristics
3.1.1Absolute Maximum Ratings
Section 3
Specifications
Table 3-1. Absolute Maximum Ratings
Voltage on any pin, except RESET with respect to Ground-0.5VVCC + 0.5V
DC Current per I/O Pin40 mA
DC Current DVCC and DGND pins200 mA
Input RF Level+10 dBm
Notes:1. Absolute Maximum Ratings are the values beyond which damage to the device may occur. Under no
3.1.2Test Conditions
Table 3-2. Test conditions (unless otherwise stated), VCC=3V, T
Supply Voltage, V
Current Consumption: RX mode19mA
Current Consumption: TX mode
Current Consumption: Radio is turned off, MCU is active 50% of the time
Current Consumption: Power-save mode
(1)(2)
ParametersMinMax
circumstances must the absolute maximum ratings given in this table be violated. Stresses beyond
those listed under "Absolute Maximum Ratings" may cause permanent damage to the device.
This is a stress rating only. Functional operation of the device at these or other conditions, beyond those
indicated in the operational sections of this specification, is not implied. Exposure to absolute maximum
rating conditions for extended periods may affect device reliability.
2. Attention! ZigBit is an ESD-sensitive device. Precaution should be taken when handling the device in
order to prevent permanent damage.
=25°C
amb
ParametersRangeUnit
CC
(2)
(1)
(1)
(1)
1.8 to 3.6V
18mA
14mA
6µA
Notes:1. The parameters are measured under the following conditions:
a) BitCloud Software is running at 4 MHz clock rate, DTR line management is turned off
b) All interfaces are set to the default state (see Pin Assignment Table)
c) Output TX power is 0 dBm
d) JTAG is not connected
2. Supply voltage below 2.7V requires the MCU to be operating at 2 MHz speed
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Current consumption actually depends on multiple factors, including but not limited to, the board design
and materials, BitCloud settings, network activity, EEPROM read/write operations. It also depends on
MCU load and/or peripherals used by an application.
3.1.3RF Characteristics
Table 3-3. RF Characteristics
Frequency Band2.4000 to 2.4835GHz
Numbers of Channels16
Channel Spacing5MHz
Transmitter Output PowerAdjusted in 16 steps-17 to +3dBm
3.2Physical/Environmental Characteristics and Outline
ParametersValueComments
Specifications
Size
18.8 x 13.5 x 2.0 mmATZB-24-B0
24.0 x 13.5 x 2.0 mmATZB-24-A2
1.3gATZB-24-B0
Weight
1.5gATZB-24-A2
Operating Temperature Range-20°C to +70°C-40°C to +85°C operational
Operating Relative Humidity Rangeno more than 80%
Note:1. Minor degration of clock stability may occur.
Figure 3-1. ATZB-24-B0 Mechanical drawing
(1)
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Figure 3-2. ATZB-24-A2 Mechanical drawing
Specifications
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3.3Pin Configuration
Figure 3-3. ATZB-24-B0 Pinout
Specifications
Figure 3-4. ATZB-24-A2 Pinout
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Table 3-6. Pin descriptions
Connector
PinPin NameDescriptionI/O
1SPI_CLKReserved for stack operation
2SPI_MISOReserved for stack operation
3SPI_MOSIReserved for stack operation
4GPIO0General Purpose digital Input/Output 0
5GPIO1General Purpose digital Input/Output 1
6GPIO2General Purpose digital Input/Output 2
7OSC32K_OUT32.768 kHz clock output
8RESETReset input (active low)
9,22,23DGNDDigital Ground
RF clock output. When module is in active state, 4
10CPU_CLK
11I2C_CLKI
12I2C_DATAI
13UART_TXDUART receive input
14UART_RXDUART transmit output
15UART_RTS
16UART_CTS
MHz signal is present on this line. While module is
in the sleeping state, clock generation is also
stopped
2
C Serial clock output
2
C Serial data input/output
(4)
.
(1)(2)(3)(4)(7)
(1)(2)(3)(4)(7)
RTS input (Request to send) for UART hardware
flow control. Active low
CTS output (Clear to send) for UART hardware
flow control. Active low
17GPIO6General Purpose digital Input/Output 6
18GPIO7General Purpose digital Input/Output 7
19GPIO3General Purpose digital Input/Output 3
20GPIO4General Purpose digital Input/Output 4
21GPIO5General Purpose digital Input/Output 5
24,25D_VCCDigital Supply Voltage (V
26JTAG_TMSJTAG Test Mode Select
27JTAG_TDIJTAG Test Data Input
28JTAG_TDOJTAG Test Data Output
29JTAG_TCKJTAG Test Clock
(2)(3)(4)(6)
30ADC_INPUT_3ADC Input Channel 3
31ADC_INPUT_2ADC Input Channel 2
32ADC_INPUT_1ADC Input Channel 1
33BAT
ADC Input Channel 0, used for battery level
measurement. This pin equals V
34A_VREFInput/Output reference voltage for ADCI/Otri-state
(4)
(4)
(4)
(4)(5)
(4)
(2)(3)(4)(7)
(2)(3)(4)(7)
(2)(3)(4)(7)
(2)(3)(4)(7)(8)
(9)
)
CC
(2)(3)(4)(6)
(2)(3)(4)(6)
(2)(3)(4)(6)
(2)(3)(7)
(2)(3)(7)
(2)(3)(7)
/3.
CC
(2)(3)(4)(7)
(2)(3)(4)(7)
(2)(3)(4)(7)
(2)(3)(4)(7)
(2)(3)(4)(7)
(2)(3)(4)(7)
(2)(3)(4)(7)
(2)(3)(4)(7)
(2)(3)(7)
I/O
I/O
I/Otri-state
I/Otri-state
I/Otri-state
I/Otri-state
I/Otri-state
I/Otri-state
I/Otri-state
I/Otri-state
I/Otri-state
Specifications
Default
State after
Power on
O
O
O
Otri-state
Itri-state
Otri-state
Itri-state
Otri-state
I
I
O
I
Itri-state
Itri-state
Itri-state
Itri-state
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Table 3-6. Pin descriptions
Connector
PinPin NameDescriptionI/O
35AGNDAnalog ground
36GPIO_1WR1-wire interface
(2)(3)(4)(7)
Specifications
Default
State after
Power on
I/O
37UART_DTR
38USART0_RXDUSART/SPI Receive pin
39USART0_TXDUSART /SPI Transmit pin
40USART0_EXTCLKUSART/SPI External Clock
DTR input (Data Terminal Ready) for UART.
Active low
(2)(3)(4)(7)
(2)(3)(4)(7)
(2)(3)(4)(7)
(2)(3)(4)(7)(11)
Itri-state
Itri-state
Otri-state
I/Otri-state
41GPIO8General Purpose Digital Input/OutputI/Otri-state
42IRQ_7Digital Input Interrupt request 7
43IRQ_6Digital Input Interrupt request 6
44,46,48RF GNDRF Analog Ground
45RFP_IODifferential RF Input/Output
47RFN_IODifferential RF Input/Output
(2)(3)(4)(7)
(2)(3)(4)(7)
(2)(3)(4)(7)
(10)
(10)
Itri-state
Itri-state
I/O
I/O
Notes:1. The UART_TXD pin is intended for input (i.e. its designation as "TXD" implies some complex system
containing ZigBit as its RF terminal unit), while UART_RXD pin, vice versa, is for output.
2. Most of pins can be configured for general purpose I/O or for some alternate functions as described in
details in the ATmega1281V Datasheet [1].
3. GPIO pins can be programmed either for output, or for input with/without pull-up resistors. Output pin
drivers are strong enough to drive LED displays directly (refer to figures on pages 387-388, [1]).
4. All digital pins are provided with protection diodes to D_VCC and DGND
5. It is strongly recommended to avoid assigning an alternate function for OSC32K_OUT pin because it is
used by BitCloud. However, this signal can be used if another peripheral or host processor requires
32.768 kHz clock, otherwise this pin can be disconnected.
6. Normally, JTAG_TMS, JTAG_TDI, JTAG_TDO, JTAG_TCK pins are used for on-chip debugging and
flash burning. They can be used for A/D conversion if JTAGEN fuse is disabled.
7. The following pins can be configured with the BitCloud software to be general-purpose I/O lines:
GPIO0, GPIO1, GPIO2, GPIO3, GPIO4, GPIO5, GPIO6, GPIO7, GPIO8, GPIO_1WR, I2C_CLK,
I2C_DATA, UART_TXD, UART_RXD, UART_RTS, UART_CTS, ADC_INPUT_3, ADC_INPUT_2,
ADC_INPUT_1, BAT, UART_DTR, USART0_RXD, USART0_TXD, USART0_EXTCLK, IRQ_7, IRQ_6.
Additionally, four JTAG lines can be programmed with software as GPIO as well, but this requires
changing the fuse bits and will disable JTAG debugging.
8. With BitCloud, CTS pin can be configured to indicate sleep/active condition of the module thus providing mechanism for power management of host processor. If this function is necessary, connection of
this pin to external pull-down resistor is recommended to prevent the undesirable transients during
module reset process.
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Specifications
For ATZB-24-B0 combined with External
Antenna
9. Using ferrite bead and 1 µF capacitor located closely to the power supply pin is recommended, as
shown below.
10. Pins 44 through 48 are not designed for the ATZB-24-A2 module. Note these pins are used in
ATZB-24-B0, see them in antenna schematics below.
For ATZB-24-B0 combined with PCB
Antenna
11. In SPI mode, USART0_EXTCLK is output. In USART mode, this pin can be configured as either input
or output pin.
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3.4Mounting Information
The below diagrams show the PCB layout recommended for ZigBit module. Neither via-holes nor wires
are allowed on the PCB upper layer in area occupied by the module. As a critical requirement, RF_GND
pins should be grounded via several holes to be located right next to the pins thus minimizing inductance
and preventing both mismatch and losses.
Figure 3-5. ATZB-24-B0 PCB Recommended Layout, Top View
Specifications
Figure 3-6. ATZB-24-A2 PCB Recommended Layout, Top View
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3.5Sample Antenna Reference Designs
This section presents PCB designs which combine ZigBit with different antennas: PCB onboard
antenna, external antenna and dual chip antenna. These antenna reference designs are recommended
for successful design-in.
Figure 3-7. PCB Layout: Symmetric Dipole Antenna recommended for ATZB-24-B0
Specifications
The symmetric dipole antenna above has been tuned for the particular design. The 'cut-and-paste'
approach would not guarantee optimal performance because of multiple factors affecting proper antenna
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match, hence, affecting the pattern. The particular factors are the board material and thickness, shields,
the material used for enclosure, the board neighborhood, and other components adjacent to antenna.
3.5.1General recommendations
Metal enclosure should not be used. Using low profile enclosure might also affect antenna tuning.
Placing high profile components next to antenna should be avoided.
Having holes punched around the periphery of the board eliminates parasitic radiation from the board
edges also distorting antenna pattern.
ZigBit module should not be placed next to consumer electronics which might interfere with ZigBit's RF
frequency band.
Specifications
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3.6Antenna specifications
ATZB-24-B0
ATZB-24-B0:
ATZB-24-B0:
3.6.1ATZB-24-B0
Figure 3-8. Symmetric Dipole Antenna Pattern (horizontal and vertical plane) for ATZB-24-B0
Specifications
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Figure 3-9. PCB Layout with 50 Ohm External Antenna recommended for ATZB-24-B0
Specifications
In case the external unbalanced 50 Ohm antenna is required, it can be easily interfaced to ATZB-24-B0
module by using 2:1 balun as shown above. The reference design in Figure 3-10 demonstrates how to
use SMA connector.
Figure 3-10. SMA connectors
ATZB-24-B0
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3.6.2ATZB-24-A2
ATZB-24-A2
ATZB-24-A2:
ATZB-24-A2:
Figure 3-11. Symmetric Dipole Antenna Pattern (horizontal and vertical plane) for ATZB-24-A2
Specifications
Note:The antenna patterns presented above were observed using PCB enhanced with legs made of original
nylon.
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Specifications
Figure 3-12. PCB Layout with Dual Chip Antenna Module recommended for ATZB-24-A2
Normally, chip antennas are more tolerant of the board or enclosure materials in ZigBit's neighborhood
as well. However, general recommendations given above for the PCB antenna design still apply.
The board design should prevent propagation of microwave field inside the board material. Electromagnetic waves of high frequency may penetrate the board thus making the edges of the board radiate,
which may distort the antenna pattern. To eliminate this effect, metalized and grounded holes must be
placed around the board's edges as shown.
Since the design of dual chip antenna is intended for installation on FR-4 board 1.6 mm thick, the
antenna performance may only be guaranteed for the particular board type and thickness.
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4.1UNITED STATES (FCC)
This equipment complies with Part 15 of the FCC rules and regulations.
To fulfill FCC Certification requirements, an OEM manufacturer must comply with the following
regulations:
1.The modular transmitter must be labelled with its own FCC ID number, and, if the FCC ID is not visible when the module is installed inside another device, then 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:
Example of label required for OEM product containing ATZB-24-A2 module
Contains FCC ID: VW4A090664
The enclosed device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions:
(i.) this device may not cause harmful interference and (ii.) this device must accept any interference received,
including interference that may cause undesired operation.
Section 4
Agency Certifications
Example of label required for OEM product containing ATZB-24-B0 module
Contains FCC ID: VW4A090665
The enclosed device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions:
(i.) this device may not cause harmful interference and (ii.) this device must accept any interference received,
including interference that may cause undesired operation.
Any similar wording that expresses the same meaning may be used.
2.To be used with the ATZB-24-B0 module, the external antennas have been tested and approved
which are specified in here below. The ATZB-24-B0 Module may be integrated with other custom
design antennas which OEM installer must authorize following the FCC 15.21 requirements.
WAR NING: The Original Equipment Manufacturer (OEM) must ensure that the OEM modular transmitter
must be labeled with its own FCC ID number. This includes a clearly visible label on the outside of the
final product enclosure that displays the contents shown below. If the FCC ID is not visible when the
equipment is installed inside another device, then the outside of the device into which the equipment is
installed must also display a label referring to the enclosed equipment.
IMPORTANT: This equipment 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 (FCC 15.19).
The internal / external antenna(s) used for this mobile transmitter must provide a separation distance of
at least 20 cm from all persons and must not be co-located or operating in conjunction with any other
antenna or transmitter.
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Installers must be provided with antenna installation instructions and transmitter operating conditions for
satisfying RF exposure compliance. This device is approved as a mobile device with respect to RF exposure compliance, and may only be marketed to OEM installers. Use in portable exposure conditions
(FCC 2.1093) requires separate equipment authorization.
IMPORTANT: Modifications not expressly approved by this company could void the user's authority to
operate this equipment (FCC section 15.21).
IMPORTANT: This equipment has been tested and found to comply with the limits for a Class A digital
device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment. This
equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in
accordance with the instruction manual, may cause harmful interference to radio communications. Operation of this equipment in a residential area is likely to cause harmful interference in which case the user
will be required to correct the interference at his own expense (FCC section 15.105).
4.2EUROPEAN UNION (ETSI)
The ATZB-24-A2 and ATZB-24-B0 Modules has been certified for use in European Union countries.
If the ATZB-24-A2 and ATZB-24-B0 Modules are 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.
Agency Certifications
Furthermore, the manufacturer must maintain a copy of the ATZB-24-A2 and ATZB-24-B0 Modules documentation and ensure the final product does not exceed the specified power ratings, antenna
specifications, 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.
IMPORTANT: 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.
Certification Approved Antennas list is presented in below.
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4.3Approved Antenna List
ATZB-24-A2 Module works with integrated dual chip antenna. The design of the antenna is fully compli-
ant with all the aforementioned regulation.
ATZB-24-B0 Module has been tested and approved for use with the antennas listed in the table below.
ATZB-24-0B Module may be integrated with other custom design antennas which OEM installer must
authorize with respective regulatory agencies.
Table 4-1. Approved Antenna specifications
Part NumberManufacture and descriptionGain [dBi]Minimum separation [cm]
Antenova Titanis, swivel antenna (1/4 wave
2010B48-01
17010.10
antenna) with SMA connector, frequency range 2.4
- 2.5 GHz
WiMo, swivel antenna (1/2 wave antenna) with SMA
connector, frequency range 2.35 - 2.5 GHz
Agency Certifications
2.220
2.120
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5.1Ordering Information
Part NumberDescription
ATZB-24-B0R2.4 GHz IEEE802.15.4/ZigBee OEM Module w/ Balanced RF Port
ATZB-24-A2R2.4 GHz IEEE802.15.4/ZigBee OEM Module with dual chip antenna
Note:Tape&Reel quantity: 200
Section 5
Ordering Information
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