DS2010_2

Dec ‘01

©2001 REG No 277 4001, England.

Page 5

FM Narrow Band Transceiver Modules

X2010 / X2011

Pin Functional Description

Pin No.

Description

Details

1 & 3

RF Ground

Ideally connected to antenna ground plane.

2

Antenna

Nominal 50 ohm input/output impedance capacitively isolated from

internal circuit.

4,5,6

NC

Not connected internally on X2010 module.

7

NC

Ground

X2010 : This is unconnected

X2011 : RF Ground.

8

RSSI

Receiver signal strength indicator. DC voltage proportional to the RF

signal strength being received.

9,10,18

Ground

Supply ground points.

11

CD

Carrier detect output, active low.

12

RxD

Receiver data output ( CMOS logic out )

13

AF

Audio frequency output.

14

TxD

Transmitter data input.

15

Tx Enable

Active low, applying Vcc disables the transmitter.

16

Rx Enable

Active low, applying Vcc places the receiver in sleep mode.

17

Vcc

Supply voltage.

State Table

Tx (pin 15)

Rx (pin 16)

Mode

1

1

Power down mode. Supply current <1uA

1

0

Receiver only enabled. Data, AF, CD and RSSI outputs valid.

0

1

Transmitter only enabled. Tx data input valid.

0

0

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)

RSSI (V)

-105

0.82

-100

0.88

-90

1.12

-80

1.43

-70

1.75

-60

2.06

-50

2.36

-40

2.57

-30

2.6

-20

2.6