DNT24P - MURATA MANUFACTURING

DNT24C

DNT24P

Rating Value Units

Power Supply Input -0.5 to +6.5 V

All Input/Output Pins -0.5 to +3.3 V

Input Power to RFIO Port 0 dBm

Non-Operating Ambient Temperature Range -40 to +85 oC

DNT24 Absolute Maximum Ratings

DNT24 Electrical Characteristics

Characteristic Sym Notes Minimum Typical Maximum Units

Operating Frequency Range 2406 2475 MHz

Hop Duration 1 8 100 ms

Number of RF Channels 1 15 or 24

Modulation FSK

RF Data Transmission Rate 250 kbps

Receiver Sensitivity @ 10-5 BER -100 dBm

Transmitter RF Output Power 1 10 or 63 mW mW

Optimum Antenna Impedance 50 Ω

RF Connection U.FL Coaxial Connector

System Topologies Point-to-Point, Point-to-Multipoint,

Peer-to-Peer and Store & Forward

Access Scheme Ad Hoc TDMA

Low Cost

2.4 GHz FHSS

Transceiver

Module with

I/O

The DNT24 series FHSS transceiver modules provide a low-cost, versatile solution for wire-

less data communications in the 2.4 GHz ISM band. The DNT24 RF output power can be set

at 10 or 63 mW. The DNT24 module includes analog, digital and serial I/O, providing the flexi-

bility to serve applications ranging from cable replacements to sensor networks. The DNT24

transceiver module is easy to integrate and provides reliable wireless communications up to

5 miles in line-of-sight installations.

2.4 GHz Frequency Hopping Spread Spectrum Transceiver

Point-to-point, Point-to-multipoint, Peer-to-peer and

Store & Forward Capabilities

Transmitter RF Power Configurable - 10 or 63 mW

Transmitter EIRP 15.8 mW or 100 mW with 2 dBi Antenna

250 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, Canadian IC and ETSI Certified for Unlicensed Operation

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Notes:

1. The DNT24 achieves regulatory certification under FHSS rules.

2. Maximum sleep current occurs at +85 oC.

Characteristic Sym Notes Minimum Typical Maximum Units

ADC Input Range 0 2.7 V

ADC Input Resolution 12 bits

ADC Sample Rate 100 Hz

Signal Source Impedance for ADC Reading 10 KΩ

ADC External Reference Voltage Range 1.0 2.7 V

DAC Output Range 0 3.3 V

DAC Output Resolution 12 bits

Primary and Diagnostic Serial Port Baud Rates 1.2, 2.4, 4.8, 9.6, 14.4, 19.2, 28.8,

38.4, 57.6, 115.2, 230.4, 250.0 kbps

Serial Peripheral Interface Data Rate 125 500 kbps

Digital I/O:

Logic Low Input Level -0.5 0.8 V

Logic High Input Level 2.45 3.3 V

Logic Input Internal Pull-up Resistor 20 KΩ

Power Supply Voltage Range VCC +3.3 +5.5 Vdc

Power Supply Voltage Ripple 10 mVP-P

Peak Transmit Mode Current, 63 mW Output 140 mA

Average Operating Receive Current:

Base and Remote Continuous Data Stream 55 mA

Remote, Linked, No Data Transmission 15 mA

Sleep Current 2 3 6 µA

DNT24C Mounting Reflow Soldering

DNT24P Mounting Socket

Operating Temperature Range -40 85 oC

Operating Relative Humidity Range, Non-condensing 10 90 %

DNT24 Electrical Characteristics

CAUTION: Electrostatic Sensitive Device. Observe precautions when handling.

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DNT24 Hardware

The major components of the DNT24 include a

2.4 GHz FHSS transceiver and a low current 8-bit

microcontroller. The DNT24 operates in the 2.4 GHz

ISM band. There are 12 selectable hopping patterns

providing compatibility with frequency allocations in

most regions of the world. The DNT24 also has two

selectable RF output power levels: 10 mW and

63 mW.

The DNT24 provides a variety of hardware interfaces.

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 dedi-

cated to diagnostics. The primary and diagnostic serial

ports support most standard baud rates up to

250.0 kbps. The SPI port supports data rates up to

500 kbps. The DNT24 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 when configured as inputs.

The radio is available in two mounting configurations.

The DNT24C is designed for solder reflow mounting.

The DNT24P is designed for plug-in connector mount-

ing.

DNT24 Firmware

DNT24 firmware operates using hybrid Ad Hoc TDMA

channel access optimized for periodic burst transmis-

sions. DNT24 firmware operates “out of the box” using

point-to-point transparent serial mode, with point-to-

multipoint, peer-to-peer and store & forward system

topologies also supported.

DNT24 firmware provides the user with a rich set of

configuration options including a choice of hopping

patterns, hopping dwell times, serial and/or SPI data

port operation, serial and SPI data rate selection, RF

output power selection, plus configurable analog and

digital I/O lines.

Data integrity is protected 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 security for sensitive

applications. Sensor networks can take advantage of

timer or event-based data reporting and remote node

sleep cycling for extended battery life.

1 8 1 9 2 0 2 1 2 2 2 311 6 2 4 2 5 2 6

1 5

1 4

1 3

1 2

1 1

1 0

N T 2 4 C / N T 2 4 P B l o c k i a g r a m

M i c r o c o n t r o l l e r

R e g

G N

A C T ( I A G _ T X )

/ C ( I A G _ R X )

G P I O 0

R A I O _ T X

R A I O _ R X

G P I O 4 ( / H O S T _ C T S )

G P I O 5 ( / H O S T _ R T S )

A C 0

G P I O 2

G P I O 1

G P I O 3 ( A V )

A C 1

V C C

G N

/ R E S E T

A C 1

M I S O

M O S I

/ S S

S C L K

3 . 3 V _ O U T

A C _ E X T _ R E F

A C 0

+ 3 . 3 V

2 8 2 9 3 0

G N

R S V

2 . 4 G H z

T r a n s c e i v e r

I R Q 0

I R Q 1 / C L K

A T A

P L L _ L O C K

S C K

S I

S O

n S S _ A T A

n S S _ C O N F I G

R S V

R F I O

T / R

P W R

P R E

F i l t e r

R F I O

Figure 1

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Pin Name I/O Description

1GND - Power supply and signal ground. Connect to the host circuit board ground.

2ACT

(DIAG_TX)

(O)

This pin’s default configuration is data activity output. On a base, this signal blinks when a valid packet is

received. On a remote, this signal blinks when a packet is transmitted. On a router, this signal blinks when

a valid upstream packet is received or a downstream packet is transmitted. Alternate pin function is the di-

agnostic serial port output.

3/DCD

(DIAG_RX)

(I)

This pin’s default configuration is data carrier detect output. On a base, this signal is asserted when any

valid packet is received, and is cleared if no packets are heard for the configured router/remote registra-

tion time-out interval. On a router or remote, this signal is asserted when the radio obtains hopping pattern

synchronization, and remains asserted until no beacons are heard for 50 hops. Alternate pin function is

the diagnostic serial port input.

4GPIO0 I/O

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.

5 RADIO_TXD O Serial data output from the radio.

6RADIO_RXD I Serial data input to the radio.

7GPOI4

(/HOST_CTS)

I/O

(O)

Default pin function is GPIO4 with the same configuration options as GPIO0. 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.

8GPOI5

(/HOST_RTS)

I/O

(I)

Default pin function is GPIO5 with the same configuration options as GPIO0. 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.

9DAC0 O 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.

10 GPIO2 I/O Configurable digital I/O port 2. Same configuration options as GPIO0.

11 GPIO1 I/O Configurable digital I/O port 1. Same configuration options as GPIO0.

12 GPIO3

(DAV)

I/O

(O)

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.

13 DAC1 O 12-bit DAC 1 output. Same specifications and configuration options as DAC0.

14 VCC I Power supply input, +3.3 to +5.5 Vdc.

15 GND -Power supply and signal ground. Connect to the host circuit board ground.

16 GND -Power supply and signal ground. Connect to the host circuit board ground.

17 /RESET I Active low module hardware reset.

18 ADC0 I

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 either the regulated supply voltage divided by 1.6 (about 2.06 V), or an ex-

ternal 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 mea-

surements are 12-bit signed values.

19 ADC1 IADC 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.

20 MISO I/O This pin is the SPI master mode input or slave mode output.

21 MOSI I/O This pin is the SPI master mode output or slave mode input.

22 /SS I/O 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.

DNT24 I/O Descriptions

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Pin Name I/O Description

23 SCLK I/O SPI clock signal. This pin is an output when operating as a master, and an input when operating as

a slave.

24 ADC2 IADC 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.

25 ADC_EXT_

REF I/O

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.

26 RSVD -Reserved pin. Leave unconnected.

27 RSVD -Reserved pin. Leave unconnected.

28 GND -Connect to the host circuit board ground plane.

29 RSVD -Reserved pin. Leave unconnected.

30 GND - Connect to the host circuit board ground plane.

DNT24 Antenna Connector

A U.FL miniature coaxial connector is provided on both DNT24 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 DNT24 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 connector 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 cir-

cuit board. Note that other circuit board traces should be spaced away from the stripline to prevent signal cou-

pling, as shown in Figure 3. The stripline trace should be kept short to minimize its insertion loss.

C o p p r

G r o u n d

P l a n

C o p p r

S t r i p l i n

T r a c

F R - 4 P C B

M a t r i a l

C i r c u i t B o a r d S t r i p l i n T r a c t a i l

F o r 5 0 o h m i m p d a n c W = 1 . 7 5 * H

Figure 2

Trace Separation from

50 ohm Microstrip

Length of Trace Run

Parallel to Microstrip

100 mil 125 mil

150 mil 200 mil

200 mil 290 mil

250 mil 450 mil

300 mil 650 mil

Figure 3

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1 . 5 0 0

( 3 8 . 1 0 )

0 . 9 8 0

( 2 4 . 9 0 )

N T 2 4 C O u t l i n a n d M o u n t i n g i m n s i o n s

0 . 0 5 0 ( 1 . 2 7 )

T o p V i w

0 . 1 2 5

( 3 . 1 8 )

1 5

1 6 3 0

i m n s i o n s i n i n c h s ( m m )

0 . 4 5 0 ( 1 1 . 4 0 ) 0 . 3 5 0 ( 8 . 8 9 )

Figure 4

0 . 0 6 0 ( 1 . 5 2 )

1 . 5 0 0 ( 3 8 . 1 0 )

0 . 9 8 0

( 2 4 . 9 0 )

N T 2 4 C S o l d r P a d i m n s i o n s

0 . 0 5 0 ( 1 . 2 7 )

T o p V i w

1 5

1 6 3 0

i m n s i o n s i n i n c h s ( m m )

0 . 0 3 5 ( 0 . 8 9 )

1 . 0 4 0

( 2 6 . 4 2 )

Figure 5

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0.980

( 2 4 . 9 )

0.050

( 1 . 2 7 )

0.700

( 1 7 . 8 )

0.100

( 2 . 5 4 )

0.800

( 2 0 . 3 )

N T 2 4 P I n t r f a c C o n n c t o r

P C B L a y o u t t a i l

C o n n c t o r s a r S A M T E C

S L M - 1 1 5 - 0 1 - G - S

o r E q u i v a l n t

i m n s i o n s a r i n i n c h s ( m m )

Figure 7

0 . 0 6 0

( 1 . 5 2 )

1 . 5 0 0

( 3 8 . 1 0 )

1 . 1 0 0

( 2 7 . 9 4 )

N T 2 4 P O u t l i n a n d M o u n t i n g i m n s i o n s

0 . 0 5 0 ( 1 . 2 7 )

T o p V i w

0 . 1 2 5

( 3 . 1 8 )

1 5

1 6 3 0

i m n s i o n s i n i n c h s ( m m )

0 . 4 5 0 ( 1 1 . 4 3 )

0 . 2 2 5

( 5 . 7 2 )

0 . 9 8 0

( 2 4 . 9 0 )

0 . 3 5 0 ( 8 . 8 9 )

Figure 6

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DNT24 Antenna Options:

For fixed or portable operation (> 20 cm from body):

Murata OMNI249 Omnidirectional Dipole Antenna, 9 dBi, 50 ohms

Murata PA2400 Patch Antenna, 6 dBi, 50 ohms

Antenna types not included in the above list, having a gain greater than the maximum gain indicated for that type,

are strictly prohibited for use with this device.

For mobile operation (< 20 cm from body):

Limited to the use of antennas of gain 3.47dBi or less.

Antennas having a gain greater than the maximum gain indicated are strictly prohibited for use with this device.

Note: Specifications subject to change without notice.

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