S
MART
R
ADIO
T
RANSCEIVER
1
Module Connections
Vcc 1
GND 2
GND 3
GND 4
ANT 5
GND 6
NC 7
NC 8
16
15
14
13
12
11
10
9
CTS
RTS
Config
DR2
DR1
Rx
Tx
PD
RF650
Pin Descriptions
Pin
Number
Name
Type
Description
1
2, 3, 4, 6
5
7, 8
9
10
Vcc
GND
Antenna
nc
PD
Tx
Power
Power
In / Out
-
In
In
11
12, 13
14
15
16
Rx
Data Rate
Configuration
RTS
CTS
Out
In
In
In
Out
Positive supply voltage connection. Decouple with 100n ceramic
capacitor to ground.
Connect to 0 volts.
Nominal 50 ohm input/output impedance capacitively isolated
from the internal circuit.
No Connection.
Power Down pin. Take low for low power standby mode.
Transmit data input from host controller.
Data input to the transmitter can be directly interfaced to CMOS
logic drive operating on the same supply voltage as the
transceiver.
Received data output to host controller (CMOS logic out)
representing true data as supplied to the transmitter.
Host Data Rate selection.
High for normal operation, low to configure module.
Logic ‘0’ is Request To Send.
Take low when the host is ready to send data to the module or is
ready to receive data from the module.
Logic ‘0’ is Clear To Send.
Taken high when the module is busy.
Host Data Rate Selection
DR2
(pin 13)
DR1
(pin12)
Baud Rate
0
0
1
1
0
1
0
1
4,800
9,600
19,200
38,400
DS650-6 June ‘06
©2006 RF Solutions Ltd, www.rfsolutions.co.uk
Tel 01273 898000 Fax 01273 480661
Page 3
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