1
DM1800-
916MN
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
916.30
916.70
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
-98
dBm
Peak Transmitter Input Current, No External Power Supply Load
I
TP
13.5
mA
Peak Transmitter Output Power
P
O
1
mW
Analog Input Measurement Range (10-bit ADC)
0
VOUT
V
Source Impedance to Analog Input
10
K
Digital In Logic High
2.4
V
Digital In Logic Low
.45
V
Digital Out Logic High, No Load
2.4
V
Digital In Logic Low, No Load
0.3
V
Digital Output Source Current, 1K load
1.1
mA
Digital Output Sink Current, 1K load
1.2
mA
Serial Port Data Rate
9.6
kb/s
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 DM1800-916MN is the 916.50 MHz field node module in the DM1800 family of RF transceiv-
ers. The DM1800 family is designed for adding embedded wireless connectivity to a wide range of
monitoring and control systems. The DM1800-916MN is equipped with a serial I/O port to interface
to a host microcontroller. The module also includes an analog input, a logic input, and a logic out-
put for monitoring and control. Radio communications range in an "open field" environment is typi-
cally 200 meters/hop. The DM1800-916MN combines RFM's very low current ASH radio tech-
nology with low power microcontroller technology to achieve long battery life. This module is com-
patible with RFM's miniMESH
TM
network protocol, which provides add-on "plug-and-play" multicast
mesh network routing. The DM1800-916MB is certified for operation under FCC 15.249 regulations.
Field Node with Host Serial Interface
Compatible with RFM miniMESH
TM
Network Protocol
3 V, Very Low Current Operation
Ready-to-Use OEM Module
916.50 MHz
Transceiver
Module
2
Theory of Operation
The major components of the DM1800-916MN include
an RFM TR1000 ASH transceiver and a Microchip
PIC16F688 microcontroller. The TR1000 operates on
a frequency of 916.50 MHz, at a nominal output power
of 1 mW.
The 16F688 provides a 9.6 kb/s serial interface for
communication with a host microcontroller. A compan-
ion interface board is available with USB bridge cir-
cuitry to interface the DM1800-916MN to a host PC.
Three of the 16F688 I/O pins are configured for exter-
nal monitoring or control. Digital In is configured as a
logic input with a weak pull-up for sensing a contact
closure to a ground pad. Digital Out is configured a
logic output. Analog In is configured as a 10-bit ana-
log-to-digital input. The DM1800 includes two LEDs
that indicate the module's operating mode.
The DM1800-916MN is compatible with RFM's
miniMESH
TM
network protocol, which provides add-on
"plug-and-play" mesh network routing to improve com-
munication range and robustness.
DM1800-916MN FCC Certification
The DM1800-916MN hardware has been certified for
operation under FCC Part 15 Rules, Section 15.249.
This certification applies only when a DM1800-916MN
is equipped with one of the following RFM antennas:
helical antenna, RFM part number 500-1195-003
helical antenna, RFM part number 500-1195-003
WARNING: the DM1800-916MN must be re-certified
if used with any antennas other than the two listed
above. Contact RFM for further information if your ap-
plication requires a special antenna configuration.
FCC Notices and Labels
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 re-
ceived, including interference that may cause unde-
sired operation.
A clearly visible label is required on the outside of the
user's (OEM) enclosure stating that this product con-
tains a DM1800-916MN transceiver assembly, FCC
ID: TE6-DM1800.
WARNING: This device operates under Part 15 of the
FCC rules. Any modification to this device, not ex-
pressly authorized by RF Monolithics, Inc., may void
the user's authority to operate this device.
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 - 9 1 6 M N 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
S E R I A L T X
S E R I A L R X
D I G I T A L O U T
A N A L O G I N
D I G I T A L I N
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.
J1-5
DIGITAL IN
This pad is connected to a logic input on the microcontroller, and is configured with a weak pull-up, allowing
both logic signals and contact closures referenced to J-1 or J-10 to be read. The value of this input is sent over
the RF channel as a response to an RF command. The input voltage range on this pad is 0 to VOUT. Applying
a voltage outside of this range may damage the module.
J1-6
ANALOG IN
This pad in the input to the microcontroller's 10-bit analog-to-digital (ADC) converter. The ADC input range is 0
to VOUT, referenced to J1-1 or J1-10. The input voltage range on this pad is 0 to VOUT. Applying a voltage
outside of this range may damage the module. The ADC reading is sent over the RF channel as a response to
an RF command.
J1-7
DIGITAL OUT
This pad is connected to a logic output on the microcontroller through a 1 kilohm resistor, which provides
short-circuit protection. The value of this output is set or read over the RF channel as a response to an RF com-
mand.
J1-8
SERIAL RX
This pad is connected to the module's serial data input (USART). Data to this pin is received at 9.6 kb/s, using
8 data bits, no parity, and one stop bit. The input voltage range on this pad is 0 to VOUT. Applying a voltage
outside of this range may damage the module.
J1-9
SERIAL TX
This pad is connected to the module's serial data output (USART) through a 1 kilohm resistor, which provides
short-circuit protection. Data from this pad is sent at 9.6 kb/s, using 8 data bits, no parity, and one stop bit.
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
DM1800-916MN 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 - 9 1 6 M N 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 - 9 1 6 M N S M T M o u n t i n g P a t t e r n
1
.
0
0
0
.
1
3
0
.
0
9
0
.
0
9
0
.
2
0
0
.
2
0
0
.
0
5
0
.
0
7
0
T
Y
P
.
1
0
0
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 1 . 1 5 m a x
Figure 3
Note: Specifications subject to change without notice.
file: dm1800_916nk.vp, 2005.12.07 rev
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