DNT500
2008 by RF Monolithics,
Inc.
14
M-0500-0000 Rev D
3. DNT500 HARDWARE
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The major components of the DNT500 include a 900 MHz FHSS transceiver and a 32-bit
microcontroller. The DNT500 operates in the frequency band of 902 to 928 MHz. There
are 32 selectable hopping patterns including patterns compatible the frequency alloca-
tions in the US, Canadian, Australian and New Zealand. The DNT500 has six selectable
RF output power levels: 0, 10, 19, 24, 27 and 28 dBm. Also, there are four selectable RF
transmission rates: 38.4, 115.2, 200 and 500 kb/s. The power level is firmware inter-
locked to a maximum of 19 dBm at 500 kb/s to assure regulatory compliance.
The DNT500 includes a low-noise preamplifier protected by two SAW filters, providing
an excellent blend of receiver sensitivity and out-of-band interference rejection.
The DNT500 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 supports baud rates from 38.4 to 460.8 kb/s. Other
hardware interfaces include an SPI interface, three 10-bit ADC inputs, two 8-bit resolu-
tion PWM (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. A
3.6 Vdc signal can be switched on the RF output port for diversity antenna control. The
radio is available in two mounting configurations. The DNT500 is designed for solder re-
flow mounting. The DNT500P is designed for plug-in connector mounting.
