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S MART ALPHA RF T RANSCEIVER
1.
Module Connections
Vcc
RFRx
RFTx
GND
ANT
GND
NC
NC
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
CTS
RTS
WRE
DR2
DR1
RX
TX
PD
Pin Descriptions
Pin
Number
1
2
3
4, 6
5
7, 8, 14
9
11
Name
Vcc
RFRx
RFTx
GND
Antenna
reserved
PD
Rx
Type
Power
Out
Out
Power
In / Out
-
In
Out
Description
Positive supply voltage connection. Decouple with 100n ceramic
capacitor to ground.
RF Data receive signal Active Low
RF Data transmit signal Active Low
Connect to 0 volts.
Nominal 50 ohm input/output impedance capacitively isolated
from the internal circuit.
Don’t connect
Power Down pin. Take low for low power standby mode.
Received data output to host controller (CMOS logic out)
representing true data as supplied to the transmitter.
Transmit data input from host controller.
10
Tx
In
Data input to the transmitter can be directly interfaced to CMOS
logic drive operating on the same supply voltage as the
transceiver.
12, 13
Data Rate
In
Host Data Rate selection.
When High configuration data is stored in EEPROM.
14
WRE
In
When Low configuration data is held in Volatile memory and lost
on power cycle. To be used If configuration is changed regular
on the fly.
Logic ‘0’ is Request To Send.
15
RTS
In
Take low when the host is ready to send data to the module or is
ready to receive data from the module.
16
CTS
Out
Logic ‘0’ is Clear To Send.
Taken high when the module is busy.
Host Data Rate Selection
DR2 (pin 13)
0
0
1
1
DR1 (pin12)
0
1
0
1
Baud Rate
4,800
9,600
19,200
38,400
DSSMARTALPHA-5
? 2009 REG No 277 4001, ENGLAND.
Page 3
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