1
DM1800-
434MR
Rating
Value
Units
All Input/Output Pins Except VIN
-0.3 to +3.3
V
Non-Operating Ambient Temperature Range
-50 to +100
o
C
Absolute Maximum Ratings
Preliminary
Electrical Characteristics
Characteristic
Sym
Notes
Minimum
Typical
Maximum
Units
Operating Frequency
f
O
433.72
434.12
MHz
Modulation Type
OOK
RF Encoded Data Transmission Rate
4.8
kb/s
Average Receiver Input Current, No External Power Supply Load
I
R
4
mA
Receiver Input Signal for 10
-3
BER, 25 C
-103
dBm
Peak Transmitter Input Current, No External Power Supply Load
I
TP
13.5
mA
Peak Transmitter Output Power
P
O
1
mW
Digital In Logic High
2.4
V
Digital In Logic Low
.45
V
Power Supply Input Voltage Range, -40 to +85
o
C
VIN
3.1
14
V
Power Supply Input Voltage Range, 0 to +85
o
C
VIN
2.6
14
V
Regulated Power Supply Output Voltage, VIN 3.1 to 14 V
VOUT
3.0
Vdc
Regulated Power Supply Voltage Ripple
10
mV
P-P
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 mon-
itoring and control systems. This module is compatible with RFM's miniMESH
TM
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 regula-
tions.
Network Router
Compatible with RFM miniMESH
TM
Network Protocol
3 V, Very Low Current Operation
Ready-to-Use OEM Module
433.92 MHz
Transceiver
Module
2
Theory of Operation
The major components of the DM1800-
433.92MR include an RFM TR3000 ASH
transceiver and a Microchip PIC16F688
microcontroller. The TR3000 operates on a
frequency of 433.92 MHz, at a nominal out-
put power of 1 mW. The DM1800 includes
two LEDs that indicate the module's operat-
ing mode. The LEDs can be disabled for low
current operation.
The DM1800-434MR is compatible with
RFM's miniMESH
TM
network protocol, which
provides add-on "plug-and-play" multicast
mesh network routing to improve communi-
cation range and robustness.
T X M O D
R X D A T A
C N T R L 1
C N T R L 0
P I C
1 6 F 6 8 8
P
D M 1 8 0 0 - 4 3 4 M R B l o c k D i a g r a m
L E D 1
L E D 2
A S H
T r a n s c e i v e r
G N D
B I N D
G N D
V O U T
V I N
3 V
R e g
G N D
G N D
J 1 - 1
J 1 - 2
J 1 - 3
J 1 - 4
J 1 - 5
J 1 - 6
J 1 - 7
J 1 - 8
J 1 - 9
J 1 - 1 0
J 2 - 2
J 2 - 1
J 2 - 3
Figure 1
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 mV
p-p
ripple on the regu-
lated 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
DM1800-434MR I/O Pad Descriptions
4
G N D
V I N
V O U T
B I N D
D I G I T A L I N
A N A L O G I N
D I G I T A L O U T
S E R I A L R X
G N D
S E R I A L T X
R F I O
G N D
G N D
D M 1 8 0 0 - 4 3 4 M R I / O P a d L a b e l s
Figure 2
. 0 9 5
. 0 8 0
1 . 5 3 5
D M 1 8 0 0 - 4 3 4 M R S M T M o u n t i n g P a t t e r n
1.
000
.1
3
0
.0
9
0
.0
9
0
.2
0
0
.2
0
0
.0
5
0
.
0
70
T
Y
P
.
1
00
T
Y
P
D i m e n s i o n s i n i n c h e s . P C B p l u s c o m p o n e n t h e i g h t i s . 1 7 0 m a x ;
P C B p l u s a n t e n n a h e i g h t i s 2 . 1 5 m a x
Figure 3
Note: Specifications subject to change without notice.
file: dm1800rj.vp, 2005.11.11 rev
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