- 900 MHz Frequency Hopping Spread Spectrum Transceivers
- Direct Peer-to-peer Low Latency Communication
- Transmitter Power Configurable to 40 or 158 mW
- 100 kbps RF Data Rate
- Serial Port Data Rate up to 250 kbps, SPI Port Data Rate up to 500 kbps
- 128-Bit AES Encryption
- Separate Serial Port for Diagnostics
- Analog and Digital I/O for Sensor Applications
- FCC and Canadian IC Certified for Unlicensed Operation
The DNT90MC and DNT90MP FHSS transceiver modules provide a low-cost, versatile solution for
wireless data communications in the 900 MHz ISM band. Direct peer-to-peer communication pro-
vides very low transmission latency between all modules in a network. The DNT90MC/MP RF out-
put power can be set at 40 or 158 mW. The DNT90MC/MP receiver input is protected by a low-loss
SAW filter, providing an excellent combination of receiver sensitivity and out-of-band interference
rejection. The DNT90M module includes analog, digital and serial I/O, providing the flexibility to
serve applications ranging from cable replacements to sensor networks. The DNT90MC/MP trans-
ceiver module is easy to integrate and provides reliable wireless communications up to 5 miles in
line-of-sight installations.
DNT90MC/MP Absolute Maximum Ratings
Rating
Power Supply Input
All Input/Output Pins
Input Power to RFIO Port
Non-Operating Ambient Temperature Range
Value
-0.5 to +6.5
-0.5 to +3.3
0
-40 to +85
Units
V
V
dBm
o
DNT90MC
DNT90MP
Low Cost
900 MHz FHSS
Transceiver
Modules with
I/O
C
DNT90MC/MP Electrical Characteristics
Characteristic
RF Communication Topology
Spread Spectrum Mode
Operating Frequency Range
Number of RF Channels
Number of Hopping Patterns
Hop Duration
Modulation
RF Data Transmission Rate
Receiver Sensitivity @ 10
-5
BER
Transmitter RF Output Power
Antenna Impedance
RF Connection
1
1
FSK
100
-100
40 or 158 mW
50
U.FL Coaxial Connector
kbps
dBm
mW
Ω
1
902.76
26
64
400
ms
Sym
Notes
Minimum
Typical
Direct Peer-to-Peer
Frequency Hopping
926.76
MHz
Maximum
Units
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DNT90MC/MP Electrical Characteristics
Characteristic
ADC Input Range
ADC Input Resolution
ADC Sample Rate
Signal Source Impedance for ADC Reading
ADC External Reference Voltage Range
DAC Output Range
DAC Output Resolution
Primary and Diagnostic Serial Port Baud Rates
Master Serial Peripheral Interface Data Rate
Slave Serial Peripheral Interface Data Rate
Digital I/O:
Logic Low Input Level
Logic High Input Level
Logic Input Internal Pull-up Resistor
Power Supply Voltage Range
Power Supply Voltage Ripple
Peak Transmit Mode Current, 158 mW Output
Receive Current
Sleep Current
DNT90MC Mounting
DNT90MP Mounting
Operating Temperature Range
Operating Relative Humidity Range, Non-condensing
-40
10
2
40
3
Reflow Soldering
Socket
85
90
o
Sym
Notes
Minimum
0
Typical
Maximum
2.7
12
Units
V
bits
Hz
100
10
1.0
0
2.7
3.3
12
1.2, 2.4, 4.8, 9.6, 14.4, 19.2, 28.8,
38.4, 57.6, 115.2, 230.4, 250.0
KΩ
V
V
bits
kbps
kbps
kbps
125
250
500
4000
-0.5
2.45
20
V
CC
+3.3
0.8
3.3
V
V
KΩ
+5.5
10
170
Vdc
mV
P-P
mA
mA
6
µA
C
%
Notes:
1. The DNT90MC/MP achieves regulatory certification under FHSS rules.
2. Maximum sleep current occurs at +85
o
C.
CAUTION: Electrostatic Sensitive Device. Observe precautions when handling.
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T 9 0 M C /
G
A C T (
/ C
G P IO 0
R A
R A
G P IO
IO _ T X
(
IA G _ T X )
IA G _ R X )
T 9 0 M P B lo c k
ia g r a m
1
2
3
IR Q 0
IR Q 1 / C L K
5
IO _ R X
(/H O S T _ C T S )
A T A
P L L _ L O C K
G P IO 5 (/H O S T _ R T S )
8
9
1 0
1 1
M ic r o c o n tr o ll r
S
S C K
S
O
A T A
F IG
I
T R C 1 0 3
A C 0
G P IO 2
G P IO 1
G P IO 3 (
A C 1
V C C
A V )
F ilt r
a n d
P o w r A m p
S A W
n S S _
n S S _ C O
1 2
1 3
1
1 5
G
+ 3 .3 V
R
g
1
G
1
/R E S E T
1 8
A
C 0
1 9
A
C 1
2 0
M IS O
2 1
M O S I
2 2
/S S
2 3
S C L K
2
3 .3 V _ O U T
2 5
A
C _ E X T _ R E
2
R S V
2
R S V
2 8
G
2 9
R S V
3 0
G
Figure 1
DNT90MC/MP Hardware
when configured as inputs. The radio is available in two
mounting configurations. The DNT90MC is designed for
solder reflow mounting. The DNT90MP is designed for
plug-in connector mounting.
DNT90MC/MP Firmware
DNT90MC/MP firmware implements
direct peer-to-peer
data transmissions that provide very low transmission
latency between all DNT90MC/MP radios in a network. In
addition, efficient point-to-point and point-to-multipoint net-
works are readily configured using direct peer-to-peer
transmissions.
DNT90MC/MP firmware provides the user with a rich set of
configuration options including a choice of hopping pat-
terns, serial and/or SPI data port operation, serial and SPI
data rate selection, RF output power selection, plus config-
urable analog and digital I/O lines. Data integrity is pro-
tected by 24-bit error detection, with optional ACK and
automatic transmission retries or redundant transmissions.
128-bit AES encryption provides a high level of data secu-
rity for sensitive applications. Sensor networks can take
advantage of timer or event-based data reporting and re-
mote node sleep cycling for extended battery life.
The major components of the DNT90MC/MP modules in-
clude a
Murata
TRC103 900 MHz FHSS transceiver and a
low current 8-bit microcontroller. The DNT90MC/MP oper-
ates in the 902 to 928 MHz ISM band. The DNT90MC/MP
hops across 26 frequency channels on one of 64 select-
able hopping patterns. The DNT90MC/MP also has two
selectable RF output power levels: +16 dBm (40 mW) and
+22 dBm (158 mW).
The DNT90MC/MP receiver is protected by a low-loss
SAW filter, providing an excellent blend of receiver sensi-
tivity and out-of-band interference rejection that is espe-
cially important in outdoor applications.
The DNT90MC/MP provides a variety of hardware inter-
faces. There are two serial ports plus one SPI port. Either
the primary serial port or the SPI port can be selected for
data communications. The second serial port is dedicated
to diagnostics. The primary and diagnostic serial ports sup-
port most standard baud rates up to 250 kbps. The SPI
port supports data rates up to 500 kbps. The DNT90-
MC/MP also includes three ADC inputs, two DAC outputs,
and six general-purpose digital I/O ports. Four of the digital
I/O ports support an optional interrupt-from-sleep mode
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DNT90MC/MP I/O Descriptions
Pin
1
2
Name
GND
ACT
(DIAG_TX)
/DCD
(DIAG_RX)
I/O
-
O
(O)
O
(I)
Description
Power supply and signal ground. Connect to the host circuit board ground.
This pin’s default configuration is transmitter activity (ACT) output. The ACT signal is asserted whenever
any data packet other than just an ACK is transmitted. The alternate function for this pin is the diagnostic
serial port output.
The /DCD signal is asserted when a DNT90MC/MP receives a valid packet. If a radio is transmitting data
and receiving ACKs, both the ACT and /DCD signals will be asserted. If a radio is receiving packets only,
the /DCD signal will be asserted. The alternate function for this pin is the diagnostic serial port input.
Configurable digital I/O port 0. When configured as an input, an internal pull-up resistor can be selected
and direct interrupt from sleep can be invoked. When configured as an output, the power-on state is
configurable. In sleep mode the pin direction, input pull-up selection or output state are also separately
configurable.
Serial data output from the radio.
Serial data input to the radio.
Default pin function is GPIO4 with the same configuration options as GPIO2. Alternate pin function is
UART/SPI flow control output. The module sets this line low when it is ready to accept data from the host
on the RADIO_RXD or MOSI input. When the line goes high, the host must stop sending data.
Default pin function is GPIO5 with the same configuration options as GPIO2. Alternate pin function is
UART/SPI flow control input. The host sets this line low to allow data to flow from the module on
the RADIO_TXD pin. When the host sets this line high, the module will stop sending data to the host.
12-bit DAC 0 output. Full scale output can be referenced to the voltage at pin 25 or the 3.3 V regulated
module bus voltage.
Configurable digital I/O port 2. Same configuration options as GPIO0.
Configurable digital I/O port 1. Same configuration options as GPIO0.
Default pin function is GPIO3 with the same configuration
options as GPIO0. When SPI slave mode oper-
ation is enabled, a logic high on this pin indicates when data is available to be clocked out by the SPI
master.
12-bit DAC 1 output. Same specifications and configuration options as DAC0.
Power supply input, +3.3 to +5.5 Vdc.
Power supply and signal ground. Connect to the host circuit board ground.
Power supply and signal ground. Connect to the host circuit board ground.
Active low module hardware reset.
ADC input 0. This pin is a direct ADC input when the ADC is operating in single-ended mode, or the differ-
ential negative input for positive inputs applied to ADC1 or ADC2 when the ADC is operating in differential
mode. Full-scale reading can be referenced to Pin 25 for ratiometric measurements. For absolute mea-
surements, the ADC can use the regulated supply voltage divided by 1.6 (about 2.06 V), or an external
voltage applied to Pin 25. In single-ended mode, ADC measurements are 11-bit unsigned values with full
scale nominally 2.7 V when referenced to a 2.7 V input on Pin 27. In differential mode, ADC measure-
ments are 12-bit signed values.
ADC input 1. Direct input when the ADC is operating in single-ended mode, positive differential input rela-
tive to ADC0 when the ADC is operating in differential mode.
This pin is the SPI master mode input or slave mode output.
This pin is the SPI master mode output or slave mode input.
SPI active low slave select. This pin is an output when the module is operating as a master, and an input
when it is operating as a slave.
SPI clock signal. This pin is an output when operating as a master, and an input when operating as
a slave.
3
4
GPIO0
I/O
5
6
7
RADIO_TXD
RADIO_RXD
GPOI4
(/HOST_CTS)
GPOI5
(/HOST_RTS)
DAC0
GPIO2
GPIO1
GPIO3
(DAV)
DAC1
VCC
GND
GND
/RESET
O
I
I/O
(O)
I/O
(I)
O
I/O
I/O
I/O
(O)
O
I
-
-
I
8
9
10
11
12
13
14
15
16
17
18
ADC0
I
19
20
21
22
23
ADC1
MISO
MOSI
/SS
SCLK
I
I/O
I/O
I/O
I/O
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Pin
24
Name
ADC2
I/O
I
Description
ADC input 2. Direct input when the ADC is operating in single-ended mode, positive differential input rela-
tive to ADC0 when the ADC is operating in differential mode.
ADC external reference voltage pin. The voltage at this pin can be used by the ADCs as a reference for
ratiometric measurements. With no external voltage or load applied, this pin presents a nominal 2.7 V out-
put through a 2.126 K source resistance. A low impedance external reference voltage in the range of 1 to
2.7 V may be applied to this pin as an option.
Reserved pin. Leave unconnected.
Reserved pin. Leave unconnected.
Connect to the host circuit board ground plane.
Reserved pin. Leave unconnected.
Connect to the host circuit board ground plane.
25
ADC_EXT_
REF
RSVD
RSVD
GND
RSVD
GND
I/O
26
27
28
29
30
-
-
-
-
-
DNT90MC/MP Antenna Connector
A U.FL miniature coaxial connector is provided on both DNT90M configurations for connection to the RFIO port. A
short U.FL coaxial cable can be used to connect the RFIO port directly to an antenna. In this case the antenna
should be mounted firmly to avoid stressing the U.FL coaxial cable due to antenna mounting flexure. Alternately,
a U.FL coaxial jumper cable can be used to connect the DNT90MC/MP module to a U.FL connector on the host
circuit board. The connection between the host circuit board U.FL connector and the antenna or antenna connec-
tor on the host circuit board should be implemented as a 50 ohm stripline. Referring to Figure 2, 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 3. The stripline trace should be kept short to minimize its insertion loss.
C ir c u it B o a r d S tr ip lin
T ra c
ta il
C o p p r
S tr ip lin
T ra c
Trace Separation from
50 ohm Microstrip
100 mil
150 mil
200 mil
Length of Trace Run
Parallel to Microstrip
125 mil
200 mil
290 mil
450 mil
650 mil
C o p p r
G ro u n d
P la n
250 mil
F R - P C B
M a t r ia l
300 mil
Figure 3
im p
d a n c
W
= 1 . 5 * H
F o r 5 0 o h m
Figure 2
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