Murata Electronics North America DNT900 Manual Do Utilizador
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©2008 by RF Monolithics, Inc.
E-mail: tech sup@rfm.com
DNT900 - 11/05/08
3.0 DNT900 Hardware
DNT900 Block Diagram
The major components of the DNT900 include a 900 MHz FHSS transceiver and a low current 32-bit
microcontroller. The DNT900 operates in the 902 to 928 MHz ISM band. There are 32 selectable hopping
patterns including patterns compatible with frequency allocations in the US, Canadian, Australian and
New Zealand. The DNT900 has six selectable RF output power levels: 1, 10, 100, 250, and 500 mW plus
1 W. Also, there are four selectable RF transmission rates: 38.4, 115.2, 200 and 500 kb/s. The power
level is firmware interlocked to a maximum of 85 mW at 500 kb/s to assure regulatory compliance.
microcontroller. The DNT900 operates in the 902 to 928 MHz ISM band. There are 32 selectable hopping
patterns including patterns compatible with frequency allocations in the US, Canadian, Australian and
New Zealand. The DNT900 has six selectable RF output power levels: 1, 10, 100, 250, and 500 mW plus
1 W. Also, there are four selectable RF transmission rates: 38.4, 115.2, 200 and 500 kb/s. The power
level is firmware interlocked to a maximum of 85 mW at 500 kb/s to assure regulatory compliance.
The DNT900 includes a low-noise preamplifier protected by two SAW filters, providing an excellent blend
of receiver sensitivity and out-of-band interference rejection that is especially important in outdoor appli-
cations.
of receiver sensitivity and out-of-band interference rejection that is especially important in outdoor appli-
cations.
The DNT900 provides a variety of hardware interfaces. There are two UART serial ports, one for data and
a second for diagnostics. The data port supports baud rates from 1.2 to 460.8 kb/s and the diagnostic port
is fixed at 115.2 kb/s. Also included are three 10-bit ADC inputs, two 8-bit PWM 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 DNT900C is designed for
solder reflow mounting. The DNT900P is designed for plug-in connector mounting.
a second for diagnostics. The data port supports baud rates from 1.2 to 460.8 kb/s and the diagnostic port
is fixed at 115.2 kb/s. Also included are three 10-bit ADC inputs, two 8-bit PWM 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 DNT900C is designed for
solder reflow mounting. The DNT900P is designed for plug-in connector mounting.
Figure 3.0.1
RSVD
RSVD
ADC_REF
RSSI
DTR
ADCO
ADC1
ADC2
E X _SYNC
UART1_RXD
UART1_TXD
CFG
V
GP100
GP101
GPIO2
GP103
PWMO
PWM1
GND
3 V
.3
3 . 8V
Reg
Reg
10
11
12
13
14
15
18
17
18
18
20
2
3
4
5
8
7
8
~
1
Filter
Filter
2 1 2 2 2 3 2 4 2 5 2 8 2 7 2 8 2 0 3 0 3 1
Microcontroller
3 2 3 3 3 4 3 5 3 8
3 7 3 8 3 0 4 0
PWR
43
T/R
T/R
Filter
42
RF10
41
PRE
RF
Transceiver
LK
PKT DET
INT
SI
SO
Sn