RK-900-FDTC Radiotronix, RK-900-FDTC Datasheet - Page 8

• Manufacturer Part Number: RK-900-FDTC
• Description: RF Modules & Development Tools Rapid Developmnt Kit
• Manufacturer: Radiotronix

Specifications of RK-900-FDTC

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Transmit VCO Control Register
The transmit VCO control register determines the
operating channel of the transmitter. The receive
frequency is determined by the values of the M,A, and
F counters.
Table 4: TX VCO REGISTER
Note that the TX register has three trim bits, where the
RX register has only two. The trim bits are used to
adjust the tuning range of the transmit VCO. The trim
ink.
The actual receive frequency can be calculated using
the following formula:
F=50E3 * (32 * M) + A +(F/8)
Example: Calculate the A, M, and F values for a receive
frequency of 926 MHz.
M=578
A=24
F=0
For this example, assuming a trim value of 2, the
programming word will be:
binary: 00101010 00001011 00000001
Table 3 lists the receive frequency and register values
for each of the 56 receive channels. The table lists
these values for both the -BS and -HS versions of the
transceiver.
EWM-900-FDTC
A
M
0
C
7
C
o
o
u
u
8
n
n
i r T
[ t
[ t
6
: 0
m
: 0
] 2
] 5
[
: 0
] 2
5
F
B
4
R
t i
e
p
g
o
s i
M
s
e t
t i
3
C
o i
[ r
o
n
: 0
u
n
] 2
[ t
2
: 6
] 9
1
A
C
1
o
u
Rev Date 7/25/01
n
0
[ t
: 3
0
] 5
1
0
2
B
y
e t
value is determined at the factory and is provided with
each module. It is clearly marked on the top of the
module in indelible ink.
The actual transmit frequency can be calculated using
same formula as for the receive register. See the
receive register description for more information on
calculating the M, A, and F values.
The table on the facing page lists the M, A, and F
values for each channel. Use this table to quickly
determine the values for programming.
Mode Control Register
The mode control register determines the operating
modes of the transceiver. With the register, the
designer can turn on and off the transmitter and
receiver sections of the transceiver.
Table 5: MODE CONTROL REGISTER
RXE determines the state of the receiver. When the
bit is set to 1, the receiver is on. When the bit is set to
The on-board crystal oscillator is automatically
enabled when either the transmitter or receiver is
enabled.
0 the bit is off.
TXE determines the state of the transmitter. When
the bit set to 1, the transmitter is on. When the bit is
set to 0, the bit is off.
The transceiver is placed in power-down mode by
turning both the transmitter and receiver off. In this
mode, the transceiver will draw <5uA.
0
0
0
7
0
0
0
6
1
0
0
5
T
0
0
B
X
4
t i
E
p
o
0
0
R
s
t i
X
3
o i
E
n
1
0
0
2
1
0
0
Preliminary
1
1
0
0
0
1
0
2
B
y
e t