FM Narrow Band Transceiver Modules
Pin Functional Description
Pin No.
1&3
2
4,5,6
7
8
9,10,18
11
12
13
14
15
16
17
Description
RF Ground
Antenna
NC
NC
Ground
RSSI
Ground
CD
RxD
AF
TxD
Tx Enable
Rx Enable
Vcc
X2010 / X2011
Details
Ideally connected to antenna ground plane.
Nominal 50 ohm input/output impedance capacitively isolated from
internal circuit.
Not connected internally on X2010 module.
X2010 : This is unconnected
X2011 : RF Ground.
Receiver signal strength indicator. DC voltage proportional to the RF
signal strength being received.
Supply ground points.
Carrier detect output, active low.
Receiver data output ( CMOS logic out )
Audio frequency output.
Transmitter data input.
Active low, applying Vcc disables the transmitter.
Active low, applying Vcc places the receiver in sleep mode.
Supply voltage.
State Table
Tx (pin 15)
1
1
0
0
Rx (pin 16)
1
0
1
0
Mode
Power down mode. Supply current <1uA
Receiver only enabled. Data, AF, CD and RSSI outputs valid.
Transmitter only enabled. Tx data input valid.
Tx and Rx enabled. This mode is to be avoided as damage to the
module will eventually occur.
RSSI Output
The RSSI output provides a dc voltage that is proportional to the RF signal strength picked up on the
antenna (pin 2) port of the module.
The table below gives typical values of RSSI for varying degrees of RF signal strength applied
RF Input (dBm)
-105
-100
-90
-80
-70
-60
-50
-40
-30
-20
RSSI (V)
0.82
0.88
1.12
1.43
1.75
2.06
2.36
2.57
2.6
2.6
DS2010_2
Dec ‘01
©2001
REG No 277 4001, England.
Page 5
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