DNT90P - RFM - Datasheet.Directory

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DNT90

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

DNT90 Absolute Maximum Ratings

DNT90 Electrical Characteristics

Characteristic Sym Notes Minimum Typical Maximum Units

Operating Frequency Range 902.76 927.24 MHz

Hop Duration 1 8 100 ms

Number of RF Channels 1 25, 26 or 52

Modulation FSK

RF Data Transmission Rate 100 kbps

Receiver Sensitivity @ 10-5 BER -100 dBm

Transmitter RF Output Power 1 40 or 158 mW mW

Optimum Antenna Impedance 50 W

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

900 MHz FHSS

Transceiver

Module with

I/O

The DNT90 FHSS transceiver module provides a low-cost, versatile solution for wireless data com-

munications in the 900 MHz ISM band. The DNT90 RF output power can be set at 40 or 158 mW.

The DNT90 receiver input is protected by low-loss SAW filter, providing an excellent combination of

receiver sensitivity and out-of-band interference rejection. The DNT90 module includes analog, digi-

tal and serial I/O, providing the flexibility to serve applications ranging from cable replacements to

sensor networks. The DNT90 transceiver module is easy to integrate and provides reliable wireless

communications up to 5 miles in line-of-sight installations.

DEVELOPMENT KIT

(Info Click here)

·900 MHz Frequency Hopping Spread Spectrum Transceiver

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

Store & Forward Capabilities

·Transmitter Power Configurable to 40 or 158 mW

·100 kbps RF Data Rate

·Serial Port Data Rate up to 230.4 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

Notes:

1. The DNT90 achieves regulatory certification under FHSS rules.

2. ADC full-scale reading is 4095 minus the zero calibration offset.

3. Maximum sleep current occurs at +85 oC.

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Characteristic Sym Notes Minimum Typical Maximum Units

ADC Input Range 2 0 2.5 V

ADC Input Resolution 12 bits

ADC Sample Rate 100 Hz

Signal Source Impedance for ADC Reading 10 KW

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 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 KW

Power Supply Voltage Range VCC +3.3 +5.5 Vdc

Power Supply Voltage Ripple 10 mVP-P

Peak Transmit Mode Current, 158 mW Output 170 mA

Average Operating Receive Current:

Base, Continuous Data Stream 110 mA

Remote, Linked, No Data Transmission 15 mA

Remote, Continuous Data Stream 25 mA

Sleep Current 3 3 6 µA

DNT90C Mounting Reflow Soldering

DNT90P Mounting Socket

Operating Temperature Range -40 85 oC

Operating Relative Humidity Range, Non-condensing 10 90 %

DNT90 Electrical Characteristics

CAUTION: Electrostatic Sensitive Device. Observe precautions when handling.

DNT90 Hardware

The major components of the DNT90 include an RFM

TRC103 900 MHz FHSS transceiver, and a low current

8-bit microcontroller. The DNT90 operates in the 902 to

928 MHz ISM band. There are three selectable hopping

patterns providing compatibility with frequency allocations

in the US, Canada, South America, Australia and New

Zealand. The DNT90 also has two selectable RF

output power levels: +16 dBm (40 mW) and +22 dBm

(158 mW).

The DNT90 receiver is protected by a low-loss SAW filter,

providing an excellent blend of receiver sensitivity and

out-of-band interference rejection that is especially impor-

tant in outdoor applications.

The DNT90 provides a variety of hardware interfaces.

There are two serial ports plus one SPI port. Either the pri-

mary serial port or the SPI port can be selected for data

communications. The second serial port is dedicated to di-

agnostics. The primary and diagnostic serial ports support

most standard baud rates up to 230.4 kbps. The SPI port

supports data rates up to 500 kbps. The DNT90 also in-

cludes three 12-bit ADC inputs, two 12-bit DAC outputs,

and six general-purpose digital I/O ports. Two 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 DNT90C is designed for sol-

der reflow mounting. The DNT90P is designed for plug-in

connector mounting.

DNT90 Firmware

DNT90 firmware operates using hybrid Ad Hoc TDMA

channel access optimized for periodic burst transmissions.

DNT90 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.

DNT90 firmware provides the user with a rich set of config-

uration 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 selec-

tion, 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 net-

works can take advantage of timer or event-based data

reporting and remote node sleep cycling for extended bat-

tery life.

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1 8 1 9 2 0 2 1 2 2 2 31 71 6 2 4 2 5 2 6

1 5

1 4

1 3

1 2

1 1

1 0

D N T 9 0 B l o c k D i a g r a m

2 7

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

R e g

G N D

A C T ( D I A G _ T X )

/ D C D ( D I A G _ R X )

G P I O 0

R A D I O _ T X D

R A D I O _ R X D

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

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

D A C 0

G P I O 2

G P I O 1

G P I O 3 ( D A V )

D A C 1

V C C

G N D

/ R E S E T

ADC1

M I S O

M O S I

/ S S

S C L K

3 . 3 V _ O U T

A D C _ E X T _ R

ADC0

+ 3 . 3 V

2 8 2 9 3 0

G N D

R S V D

T R C 1 0 3

I R Q 0

I R Q 1 / D C L K

D A T A

P L L _ L O C K

S C K

S D I

S D O

n S S _ D A T A

n S S _ C O N F I G

S A W F i l t e r

a n d

P o w e r A m p

R S V D

Figure 1

Pin Name I/O Description

1 GND - 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.

4 GPIO0 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.

6 RADIO_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 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.

8GPOI5

(/HOST_RTS)

I/O

(I)

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.

9 DAC0 O 12-bit DAC 0 output. Full scale output can be referenced to the voltage at pin 25, the internal 1 V

band-gap reference, or the 3.3 V regulated module bus voltage.

10 GPIO2 I/O Configurable digital I/O port 2. Same configuration options as GPIO0 except interrupt from sleep is only

tested at the sleep mode ADC sampling interval.

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 GPIO2. 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

12-bit ADC input 0. Full scale reading can be referenced to Pin 25 for ratiometric measurements. For ab-

solute measurements, the ADC can use either an internal 1 V band-gap reference, the regulated buss

voltage divided by 1.6 (about 2.06 V), or an external voltage applied to Pin 25. The ADC full-scale reading

is equal to 4095 minus the zero calibration offset, or nominally 2.5 V.

19 ADC1 I 12-bit ADC input 1. Same configuration options as ADC0.

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.

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.

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DNT90 I/O Descriptions

Pin Name I/O Description

24 ADC2 I 12-bit ADC input 2. Same configuration options as ADC0.

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 1.65 V

output througha5Ksource 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.

DNT90 Antenna Connector

A U.FL miniature coaxial connector is provided on both DNT90 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 DNT90 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.

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C o p p e r

G r o u n d

P l a n e

C o p p e r

S t r i p l i n e

T r a c e

F R - 4 P C B

M a t e r i a l

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

F o r 5 0 o h m i m p e d a n c e 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 . 4 5 0

( 3 6 . 8 )

0 . 9 8 0

( 2 7 . 9 )

D N T 9 0 C O u t l i n e a n d M o u n t i n g D i m e n s i o n s

0 . 0 5 0 ( 1 . 2 7 )

T o p V i e w

0 . 1 2 5

( 3 . 1 8 )

1 5

1 6 3 0

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

0 . 0 9 0

0 . 4 5 0 ( 1 1 . 4 ) 0 . 3 0 0 ( 7 . 6 2 )

Figure 4

0 . 0 6 0 ( 1 . 5 2 )

1 . 4 5 0 ( 3 6 . 8 )

0 . 9 8 0

( 2 4 . 9 )

D N T 9 0 C S o l d e r P a d D i m e n s i o n s

0 . 0 5 0 ( 1 . 2 7 )

T o p V i e w

1 5

1 6 3 0

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

0 . 0 3 5 ( 0 . 8 9 )

1 . 0 4 0

( 2 6 . 4 )

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 )

D N T 9 0 P I n t e r f a c e C o n n e c t o r

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

C o n n e c t o r s a r e 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 e n t

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

Figure 7

Note: Specifications subject to change without notice.

Part # M-0090-0000, Rev A

0 . 0 6 0

( 1 . 5 2 )

1 . 4 5 0

( 3 6 . 8 )

1 . 1 0 0

( 2 7 . 9 )

D N T 9 0 P O u t l i n e a n d M o u n t i n g D i m e n s i o n s

0 . 0 5 0 ( 1 . 2 7 )

T o p V i e w

0 . 1 2 5

( 3 . 1 8 )

1 5

1 6 3 0

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

0 . 4 5 0 ( 1 1 . 4 )

0 . 0 9 0

( 2 . 2 9 )

0 . 2 2 5

( 5 . 7 2 )

0 . 9 8 0

( 2 4 . 9 )

0 . 3 0 0 ( 7 . 6 2 )

Figure 6