RFM DM1800

Preliminary
DM1800434MR
®
• Network Router
• Compatible with RFM miniMESHTM Network Protocol
• 3 V, Very Low Current Operation
• Ready-to-Use OEM Module
The DM1800-434MR is the 433.92 MHz router module in the DM1800 family of RF transceivers.
The DM1800 family is designed for adding embedded wireless connectivity to a wide range of monitoring and control systems. This module is compatible with RFM’s miniMESHTM network protocol,
which provides add-on “plug- and-play” multicast mesh network routing. Radio communications
range in an “open field” environment is typically 200 meters/hop. The DM1800-434MR combines
RFM’s very low current ASH radio technology with low power microcontroller technology to achieve
long battery life. The DM1800-434MR is designed for operation under ETSI I-ETS 300 220 regulations.
433.92 MHz
Transceiver
Module
Absolute Maximum Ratings
Rating
Value
All Input/Output Pins Except VIN
-0.3 to +3.3
Non-Operating Ambient Temperature Range
-50 to +100
Units
V
o
C
Electrical Characteristics
Characteristic
Sym
Operating Frequency
fO
Notes
Minimum
Typical
433.72
Modulation Type
Maximum
Units
434.12
MHz
OOK
RF Encoded Data Transmission Rate
Average Receiver Input Current, No External Power Supply Load
IR
-3
Receiver Input Signal for 10 BER, 25 °C
Peak Transmitter Input Current, No External Power Supply Load
ITP
Peak Transmitter Output Power
PO
Digital In Logic High
4.8
kb/s
4
mA
-103
dBm
13.5
1
mW
2.4
V
Digital In Logic Low
Power Supply Input Voltage Range, -40 to +85 oC
o
Power Supply Input Voltage Range, 0 to +85 C
Regulated Power Supply Output Voltage, VIN 3.1 to 14 V
.45
V
VIN
3.1
14
V
VIN
2.6
14
V
VOUT
Regulated Power Supply Voltage Ripple
3.0
Vdc
10
1
mA
mVP-P
D M 1 8 0 0 -4 3 4 M R
B lo c k D ia g r a m
J 1 -1 0
G N D
J 2 -3
J 2 -2
G N D
J 2 -1
A S H
T r a n s c e iv e r
C N T R L 0
J 1 -9
C N T R L 1
J 1 -8
R X D A T A
J 1 -7
T X M O D
L E D
1
L E D
2
G N D
P IC
1 6 F 6 8 8
µ P
J 1 -6
J 1 -5
3 V
R e g
J 1 -4
B IN D
J 1 -3
V O U T
J 1 -2
V IN
J 1 -1
G N D
Figure 1
Theory of Operation
ing mode. The LEDs can be disabled for low
current operation.
The major components of the DM1800433.92MR include an RFM TR3000 ASH
transceiver and a Microchip PIC16F688
microcontroller. The TR3000 operates on a
frequency of 433.92 MHz, at a nominal output power of 1 mW. The DM1800 includes
two LEDs that indicate the module’s operat-
The DM1800-434MR is compatible with
RFM’s miniMESHTM network protocol, which
provides add-on “plug-and-play” multicast
mesh network routing to improve communication range and robustness.
2
DM1800-434MR I/O Pad Descriptions
Pin
Name
Description
J1-1
GND
This pad is a signal and power supply ground.
J1-2
VIN
This is the power supply input pad. The allowed input voltage range is 2.6 to 14 V.
J1-3
VOUT
VOUT tracks 50 to 100 mV below VIN when VIN is in the range of 2.6 to 3.1 V. When VIN is in the range of 3.1
to 14 V, VOUT is regulated at 3.0 Vdc. Up to 10 mA can be supplied from this pad for powering external circuits
such as thermistor-resistor networks. External circuitry must not impress more than 10 mVp-p ripple on the regulated output voltage.
J1-4
BIND
This pad is connected to a logic input on the microcontroller, and is configured with a weak pull-up. When this pin
is momentarily grounded (to J1-1 or J1-10, the module is placed into the bind mode, allowing this module to be
associated with other modules to form a network.
J1-10
GND
This pad is a signal and power supply ground.
J2-1
GND
This pad is a ground for the antenna port.
J2-2
ANT
This pad is the antenna port.
J2-3
GND
This pad is a ground for the antenna port.
3
D M 1 8 0 0 -4 3 4 M R I/O
P a d L a b e ls
G N D
S E R IA L T X
S E R IA L R X
G N D
D IG IT A L O U T
A N A L O G
R F IO
IN
D IG IT A L IN
B IN D
G N D
V O U T
V IN
G N D
Figure 2
D M 1 8 0 0 -4 3 4 M R S M T M o u n tin g P a tte r n
1 .5 3 5
.0 8 0
.0 5 0
.0 9 0
.0 7 0 T Y P
.2 0 0
1 .0 0 0
.1 3 0
.2 0 0
.1 0 0 T Y P
.0 9 0
.0 9 5
D im e n s io n s in in c h e s . P C B p lu s c o m p o n e n t h e ig h t is .1 7 0 m a x ;
P C B p lu s a n te n n a h e ig h t is 2 .1 5 m a x
Figure 3
Note: Specifications subject to change without notice.
file: dm1800rj.vp, 2005.11.11 rev
4