Radiometrix Ltd

CXT/CXR – Multi channel Remote Controller Data Sheet

page 5

Pin description –CXR

Pin

Name

Function

1a

Vcc

3.1 – 15V power supply

2a

0V

Ground

3a

RXE

Receiver Enable (active high)

4a

RXD

Link to 4b

5a

N/C (AF out)

No connection, 700mV p-p audio. DC coupled, approx 0.8v bias.

1b

SI

Serial frequency programming / configuration

1

2b

A (out)

Main (latching) output

3b

B (out)

Secondary output

4b

R_in

Link to 4a

5b

RSSI

DC level between 0.5v and 2.2v. 60dB dynamic range

NOTES:

1.

Serial programming is by an inverted, CMOS logic level, 2400 baud RS232 datastream applied

to the SI pin.

2.

Do not exceed 3v logic levels on SI, A or B.

3.

SI input has pullup (50K) to 3v internal rail.

4.

A and B outputs are 3v cmos, active high. Up to 5mA may be drawn from each

5.

CX versions can be identified by the presence of C7, on the underside of the LMR series RX

board

Figure 4: CXR footprint (top view)