DNT90C View Datasheet(PDF) - Unspecified
Part Name
Description
MFG CO.
'DNT90C' PDF : 8 Pages View PDF
GND
1
A C T (D IA G _ T X )
2
/D C D (D IA G _ R X )
3
G P IO 0
4
R A D IO _ T X D
5
R A D IO _ R X D
6
G P IO 4 (/H O S T _ C T S ) 7
G P IO 5 (/H O S T _ R T S ) 8
DAC0
9
G P IO 2
10
G P IO 1
11
G P IO 3 (D A V )
12
DAC1
13
VCC
14
GND
15
+ 3 .3 V
R eg
D N T 9 0 B lo c k D ia g r a m
M ic r o c o n tr o lle r
IR Q 0
IR Q 1 /D C L K
D A TA
P LL_LO C K
SCK
SDI
SDO
nS S _D A TA
n S S _ C O N F IG
TR C 103
S A W F ilte r
and
P ow er A m p
16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Figure 1
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 North America, South America and Australia. 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 250 kbps. The SPI port
supports data rates up to 500 kbps. The DNT90 also in-
cludes three ADC inputs, two DAC outputs, and six gen-
eral-purpose digital I/O ports. Four of the digital I/O ports
support an optional interrupt-from-sleep mode when con-
figured as inputs. The radio is available in two mounting
configurations. The DNT90C is designed for solder 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.
www.RFM.com E-mail: info@rfm.com
© 2010-2012 by RF Monolithics, Inc.
Page 3 of 7
DNT90 - 11/06/12
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