www.RFM.com E-mail: info@rfm.com Page1of5
©2008 by RF Monolithics, Inc. DM1810-916MN - 4/17/08
DM1810-
916MN
Rating Value Units
All Input/Output Pins Except VIN -0.3 to +3.3 V
Non-Operating Ambient Temperature Range -40 to 85 oC
Absolute Maximum Ratings
Electrical Characteristics
Characteristic Sym Notes Minimum Typical Maximum Units
Operating Frequency fO916.30 916.70 MHz
Modulation Type OOK on BPSK Spreading Code
RF Encoded Data Transmission Rate 4.8 kb/s
Average Receive Input Current, No External Power Supply Load IR5.5 mA
Receiver Input Signal for 10-3 BER, 25 °C-100 dBm
Average Transmit Input Current, No External Power Supply Load ITA 15.75 mA
Peak Transmit Input Current, No External Power Supply Load ITP 32 mA
Peak Transmitter Output Power PO10 mW
Analog Input Measurement Range (10-bit ADC) 0 VOUT V
Analog Input Signal Source Impedance 10 K
Bind Input, Digital Input and Serial RX Logic High 2.4 V
Bind Input, Digital Input and Serial RX Logic Low 0.45 V
Digital Output and Serial TX Logic High, No Load 2.4 V
Digital Output and Serial TX Logic Low, No Load 0.3 V
The DM1810-916MN is the 916.50 MHz field node module in the DM1810 family of RF transceiv-
ers. The DM1810 family is designed for adding wireless mesh network connectivity to a wide range
of monitoring and control systems. The DM1810-916MN is equipped with a serial I/O port to inter-
face a host microcontroller. The module also includes an analog input, a logic input, and a logic
output for monitoring and control. Radio communications range in an “open field” environment is
typically 600 meters/hop. The DM1810-916MN 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 miniMESHTM network protocol, which provides “plug-and-play” multicast mesh
network routing. The DM1810-916MN is certified for operation under FCC 15.247 and Canadian
RSS 210 regulations.
Field Node with Host Serial Interface
Compatible with RFM miniMESHTM Network Protocol
3 V, Very Low Current Operation
Ready-to-Use OEM Module 916.50 MHz
Transceiver
Module
DEVELOPMENT KIT
(Info Click here)
www.RFM.com E-mail: info@rfm.com Page2of5
©2008 by RF Monolithics, Inc. DM1810-916MN - 4/17/08
Electrical Characteristics
Characteristic Sym Notes Minimum Typical Maximum Units
Digital Output Source Current, 1K load 1.1 mA
Digital Output Sink Current, 1K load 1.2 mA
Serial Port Data Rate 1.2 9.6 kb/s
Average Sleep Input Current, No External Power Supply Load ISA 60 µA
Power Supply Input Voltage Range, -40 to +85 oC VIN 3.1 10 V
Power Supply Input Voltage Range, 0 to +85 oC VIN 2.6 10 V
Regulated Power Supply Output Voltage, VIN 3.1 to 10 V VOUT 3.0 Vdc
Regulated Power Supply Voltage Ripple 10 mVP-P
Relative Humidity Range, Non-Condensing RH 10 90 %
Theory of Operation
The major components of the DM1810-916MN include
an RFM TR8100 ASH transceiver and a Microchip
PIC16F689 microcontroller. The TR8100 operates on
a frequency of 916.50 MHz, at a nominal output power
of 10 mW.
The 16F689 provides a 9.6 kb/s serial interface for
communication with a host microcontroller. A compan-
ion interface board, the IM1800, is available with USB
bridge circuitry to interface the DM1810-916MN to a
host PC. Three of the 16F689 I/O pins are configured
for external monitoring or control. Digital In is config-
ured as a logic input with a weak pull-up for sensing a
contact closure to a ground pad. Digital Out is config-
ured a logic output. Analog In is configured as a 10-bit
analog-to-digital input. The DM1810 includes two
LEDs that indicate the module’s operating mode.
The DM1810-916MN firmware is based on RFM’s
miniMESH network protocol, which utilizes time-
synchronized redundant routing to provide robust,
deterministic packet delivery though a network with up
to 15 routers. Network configuration and maintenance
features are built into the miniMESH protocol, simplify-
ing commissioning and operating logistics.
The DM1810-916MN application programming inter-
face (API) provides straightforward, flexible support for
the serial port, ADC input, digital input and digital out-
put, including event messaging from field nodes. The
firmware also includes several sleep cycling methods
for extended battery life operation.
Please refer to the DM1810 User’s Guide and the
AN1810 series Application Notes for installation and
application programming information. See the RFM
web site at www.RFM.com.
DM1810-916MN FCC Certification
The DM1810-916MN hardware has been certified for
operation under FCC Part 15 Rules, Section 15.247.
The antenna(s) used for this transmitter must be in-
stalled to 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.
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 DM1810-916MN transceiver assembly, FCC
ID: HSW-DM1810A. WARNING: This device oper-
ates under Part 15 of the FCC rules. Any modification
to this device, not expressly authorized b RFM, may
void the user’s authority to operate this device.
www.RFM.com E-mail: info@rfm.com Page3of5
©2008 by RF Monolithics, Inc. DM1810-916MN - 4/17/08
TXM O D
RX DATA
CNTRL1
CNTRL0
PIC
16F689
µP
D M 1810-916M N B lock D iagram
LED 1
LED 2
TR 8100
ASH
Transceiver
GND
SERIAL TX
SERIAL RX
DIGITAL OUT
ANALOG IN
DIGITAL IN
BIND
GND
VOUT
VIN
3 V
Reg
GND
GND
J1-1
J1-2
J1-3
J1-4
J1-5
J1-6
J1-7
J1-8
J1-9
J1-10
J3-2
J3-1
J3-3
RSSI
J4-1
J4-2
D1
D2
Figure 1
Canadian Department of Communications Industry
Notice - IC: 4492A-DM1810A
This apparatus complies with Health Canada’s Safety
Code6/ICRSS210. To prevent radio interference to
the licensed service, this device is intended to be op-
erated indoors and away from windows to provide
maximum shielding. Equipment (or its transmit an-
tenna) that is installed outdoors may be subject to
licensing.
ICES-003
This digital apparatus does not exceed the Class B
limits for radio noise emissions from digital apparatus
as set out in the radio interference regulations of
Industry Canada.
Le present appareil numerique n’emet pas de bruits
radioelectriques depassant les limites applicables aux
appareils numeriques de Classe B prescrites dans le
reglement sur le brouillage radioelectrique edicte par
Industrie Canada.
www.RFM.com E-mail: info@rfm.com Page4of5
©2008 by RF Monolithics, Inc. DM1810-916MN - 4/17/08
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 10 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 10 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 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 (de-
fault), using 8 data bits, no parity, 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 (default), using 8 data bits, no parity, one stop bit.
J1-10 GND This pad is a signal and power supply ground.
J3-1 GND This pad is a ground for the antenna port.
J3-2 ANT This pad is the antenna port.
J3-3 GND This pad is a ground for the antenna port.
J4-1 D1 This pad is the LED 1 signal.
J4-2 D2 This pad is the LED 2 signal.
DM1810-916MN I/O Pad Descriptions
CAUTION: Electrostatic Sensitive Device. Observe precautions when handling.
www.RFM.com E-mail: info@rfm.com Page5of5
©2008 by RF Monolithics, Inc. DM1810-916MN - 4/17/08
D M 1810-916M N I/O P ad Labels
DIG ITA L O U T
SERIAL TX
SERIAL RX
GND
ANALOG IN
DIG ITA L IN
BIND
VOUT
VIN
GND
GND
RFIO
GND
D1
D2
Figure 2
1.485
DM 1810-916M N SM T M ounting Pattern
1.000
.1 3 0 .0 9 0.0 9 0
.2 0 0 .2 0 0
.070 TY P
Dim ensions in inches. PCB plus com ponent height is .170 m ax;
PC B plus antenna height is 2.15 m ax
.100 TY P
.1 2 0 .1 8 0
.1 0 0
.1 2 0
.0 9 5
P la c e .1 0 0 u n p la te d
antenna clearance hole
under antenna pad (do
not solder antenna pad)
Figure 3
Note: Specifications subject to change without notice.