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©2008 by RF Monolithics, Inc. ZMN2405 - 5/20/08
ZMN2405
Rating Value Units
All Input/Output Pins -0.3 to +3.6 V
Non-Operating Ambient Temperature Range -40 to +85 oC
ZMN2405 Absolute Maximum Ratings
ZMN2405 Electrical Characteristics
Characteristic Sym Notes Minimum Typical Maximum Units
Operating Frequency Range 2405 2480 MHz
Operating Frequency Tolerance -300 300 kHz
Spread Spectrum Method Direct Sequence
Modulation Type O-QPSK
Number of RF Channels 16
RF Data Transmission Rate 250 kb/s
Symbol Rate Tolerance 120 ppm
RF Channel Spacing 5 MHz
Receiver Sensitivity, 10E-5 BER -92 dBm
Upper Adjacent Channel Rejection, +5 MHz 41 dB
Lower Adjacent Channel Rejection, -5 MHz 30 dB
Upper Alternate Channel Rejection, +10 MHz 55 dB
Lower Alternate Channel Rejection, -10 MHz 53 dB
Maximum RF Transmit Power -3 0 dBm
Transmit Power Adjustment 26 dB
Optimum Antenna Impedance 50 Ω
•2.4 GHz ZigBee Transceiver Module
•Small Size, Light Weight, Low Cost
•Sleep Current less than 3 µA
•FCC and ETSI Certified for Unlicensed Operation
The ZMN2405 2.4 GHz transceiver module is a low cost solution for point-to-point,
point-to-multipoint and MESH wireless systems. The ZMN2405 module provides the
flexibility and versatility to serve applications ranging from cable replacements to
sensor networks. Based on the IEEE 802.15.4 wireless standard and the ZigBee
protocol stack, the ZMN2405 module is easy to integrate and provides robust wire-
less communications including MESH network operation. The ZMN2405 includes
RFM’s powerful CSM application profile, which eliminates the need for customer
firmware programming.
Shown with Shield Removed
ZigBee
Transceiver
Module
DEVELOPMENT KIT
(Info Click here)
ZMN2405 Firmware Configurations
ZMN2405 modules are shipped loaded with one of three firmware configurations: coordinator, router or end
node. Each ZigBee network will include one, and only one coordinator. This module coordinates the overall net-
work operation and is the host application or gateway interface point for the network. The part number designation
for a coordinator is ZMN2405-C. Router modules are capable of retransmitting messages and provide the mesh
networking infrastructure in a ZigBee network. The part number designation for a router is ZMN2405-R. End node
modules provide field connection points for sensors, data loggers, PLCs, etc. The coordinator and the routers in a
ZigBee network must stay active (awake) continuously to support network operation. End nodes can be sleep
duty cycled where needed for extended battery life operation. The part number designation for an end node is
ZMN2405-E. A router can provide the same field connection support as an end node, but a router cannot be sleep
duty cycled without affecting mesh network operation. Specify the number of modules for each firmware configu-
ration when ordering ZMN2405 modules.
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©2008 by RF Monolithics, Inc. ZMN2405 - 5/20/08
Characteristic Sym Notes Minimum Typical Maximum Units
ADC Input Range 0 3.3 V
ADC Input Resolution 7 12 bits
ADC Input Impedance 55 MΩ
PWM Output Resolution 12 bits
UART Baud Rate 1.2 115.2 kb/s
Digital I/O:
Logic Low Input Level -0.3 0.5 V
Logic High Input Level 2.8 3.6 V
Logic Input Internal Pull-up/Pull-down Resistor 20 KΩ
GPIO3 Logic Low Sink Current 20 mA
Power Supply Voltage Range VCC +3.3 +5.5 Vdc
Power Supply Voltage Ripple 10 mVP-P
Receive Mode Current 27 mA
Transmit Mode Current 28 mA
Sleep Mode Current 3µA
Operating Temperature Range -40 85 oC
ZMN2405 Electrical Characteristics
CAUTION: Electrostatic Sensitive Device. Observe precautions when handling.
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©2008 by RF Monolithics, Inc. ZMN2405 - 5/20/08
ZMN2405 Hardware
The major hardware component of the ZMN2405 is
the CC2430 IEEE 802.15.4 compatible transceiver
with integrated 8051 microcontroller. The ZMN2405
operates in the frequency band of 2405 to 2480 MHz
at a nominal output power of 1 mW.
Two crystals are provided to operate the CC2430, a
32 MHz crystal for normal operation and a 32.768 kHz
crystal for precision sleep mode operation.
The ZMN2405 provides a variety of application hard-
ware interfaces including an SPI interface, UART
interface, three 12-bit ADC inputs, two PWM (DAC)
outputs, and six general purpose digital I/O ports.
ZMN2405 Firmware
The main firmware components in the ZMN2405
include the ZigBee protocol stack and RFM’s CSM
standard module application profile. The ZigBee proto-
col stack implements networking and security, with
underlying support from the 802.15.4 Media Access
Control (MAC) layer. The CSM profile provides an
application programming interface (API) for all the
ZMN2405 application hardware interfaces. The CSM
profile includes Network Discovery, Send/Receive
Serial Data, Read/Write SPI Port, Read ADC Inputs,
Write DAC Outputs, Read/Write GPIO and Module
Configuration services. In addition, the CSM profile
provides two sleep modes - timer sleep and interrupt
sleep. See the ZMN2405 ZigBee Module Developer’s
Kit User’s Manual for complete details of the CSM pro-
file API.
2 3 2 4 2 5 2 6 2 7 2 82 22 12 01 9 2 9 3 0 3 1
1 8
1 7
1 6
1 5
1 4
1 3
1 2
1 1
1 0
9
8
7
6
5
Z M N 2 4 0 5 B l o c k D i a g r a m
F i l t e r
F i l t e r
F i l t e r
3 2 3 3 3 4 3 6
C C 2 4 3 0
8 0 2 . 1 5 . 4
R a d i o a n d
M i c r o c o n t r o l l e r
4
3
2
1R e g
F i l t e r
F i l t e r
V C C
G N D
P W M A
P W M B
G P I O 0
G P I O 1
G P I O 2
G P I O 3
G P I O 4
G P I O 5
G N D
L I N K / T D O
/ R E S E T
A C T / T C K
N C
ADC REF
G N D
G N D
3 5
+ 3 . 3 V
R F I O
3 2 M H z3 2 . 7 6 8 k H z
G N D
G N D
UART_RX
U A R T _ T X
RESET
ADCX
ADCY
ADCZ
G N D
S P I _ E N
S P I _ S C L K
S P I _ M O S I
S P I _ M I S O
G N D
G N D
G N D
N C
T X / R X
C o m b i n e r
Figure 1
Pad Name Description
1 VCC Power supply input, +3.3 to +5.5 Vdc.
2 GND Power supply and signal ground. Connect to the host circuit board ground.
3 PWMA Pulse-width modulated output A. Provides a DAC function when used with an external low-pass filter.
4 PWMB Pulse-width modulated output B. Provides a DAC function when used with an external low-pass filter.
5 GPIO0 Configurable digital I/O port 0. When configured as an output, the power-on state is also configurable.
6 GPIO1 Configurable digital I/O port 1. When configured as an output, the power-on state is also configurable.
7 GPIO2 Configurable digital I/O port 2. When configured as an output, the power-on state is also configurable.
8 GPIO3 Configurable digital I/O port 3. When configured as an output, this high current port can sink up to 20 mA. The
power-on output state is also configurable.
9 GPIO4 Configurable digital I/O port 4. When configured as an output, the power-on state is also configurable.
10 GPIO5 Configurable digital I/O port 5. When configured as an output, the power-on state is also configurable.
11 GND Power supply and signal ground. Connect to the host circuit board ground.
12 LINK/DD Output signal indicating module’s link status in default mode. Also used by JTAG interface as Data Output.
13 /RESET Active low hardware reset. Hold this input low when the power supply is below 2.7 V. In parallel with pad 24.
14 ACT/DC Output signal indicating RF data activity. Also used by JTAG interface as Data Clock Input.
15 NC No connection.
16 ADC REF Module’s +3.3 V regulated supply, used for ratiometric ADC readings. Current drain on this output should be no
greater than 5 mA.
17 - 20 GND Power supply and signal grounds. Connect to the host circuit board ground.
21 UART_RX Serial data input to UART.
22 UART_TX Serial data output from UART.
23 NC No connection.
24 /RESET Active low hardware reset. Hold this input low when the power supply is below 2.7 V. In parallel with pad 13.
25 ADCX 7- to 12-bit ADC input X. ADC full scale can be referenced to +3.3 V supply or internal +2.5 V reference.
26 ADCY 7- to 12-bit ADC input Y. ADC full scale can be referenced to +3.3 V supply or internal +2.5 V reference.
27 ADCZ 7- to 12-bit ADC input Z. ADC full scale can be referenced to +3.3 V supply or internal +2.5 V reference.
28 GND Power supply and signal ground. Connect to the host circuit board ground.
29 SPI_EN Active-low enable output for SPI bus devices.
30 SPI_SCLK SPI port clock signal.
31 SPI_MOSI SPI port data output.
32 SPI_MISO SPI port data input.
33 GND Power supply and signal ground. Connect to the host circuit board ground.
34 GND RF ground. Connect to the host circuit board ground plane, and to shield when using coaxial cable.
35 RFIO RF port. Connect the antenna to this port with a 50 Ωstripline or semi-rigid coaxial cable.
36 GND RF ground. Connect to the host circuit board ground plane, and to shield when using coaxial cable.
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©2008 by RF Monolithics, Inc. ZMN2405 - 5/20/08
ZMN2405 I/O Pad Descriptions
RFIO Stripline
The RFIO pad on the radio module is connected directly to an antenna on the host circuit board, or to an MMCX
or similar RF connector. It is important that this connection be implemented as a 50 ohm stripline. Referring to
Figure 3, the width of this stripline depends on the thickness of the circuit board between the stripline and the
groundplane. For FR-4 type circuit board materials (dielectric constant of 4.7), the width of the stripline is equal to
1.75 times the thickness of the circuit board. Note that other circuit board traces should be spaced away from the
stripline to prevent signal coupling, as shown in Figure 4. The stripline trace should be kept short to minimize its
insertion loss.
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©2008 by RF Monolithics, Inc. ZMN2405 - 5/20/08
0 . 0 3 0
S q u a r e
0 . 0 9 0
1 . 2 0 0
0 . 0 9 0
0 . 8 3 5
0 . 7 9 0
Z M N 2 4 0 5 O u t l i n e a n d M o u n t i n g D i m e n s i o n s
0 . 0 6 0
1
3 6
T o p V i e w
0 . 0 9 5
1 8
1 9
Figure 2
C o p p e r
G r o u n d
P l a n e
C o p p e r
S t r i p l i n e
T r a c e
F R - 4 P C B
M a t e r i a l
C i r c u i t B o a r d S t r i p l i n e T r a c e D e t a i l
F o r 5 0 o h m i m p e d a n c e W = 1 . 7 5 * H
Figure 3 Figure 4
Trace Separation from
50 Ohm Microstrip
Length of Trace Run
Parallel to Microstrip
100 mil 125 mil
150 mil 200 mil
200 mil 290 mil
250 mil 450 mil
300 mil 650 mil
Reflow Profile
An example solder reflow profile for mounting the radio module on its host circuit board is shown in Figure 5.
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©2008 by RF Monolithics, Inc. ZMN2405 - 5/20/08
Figure 5
Note: Specifications subject to change without notice.
