Radiometrix Ltd, BiM2A Data Sheet

page 3

RXD

pin 12

Digital output from internal data slicer. The output is a squared version of the signal on pin 13 (AF) and

may be used to drive a decoder directly. The data is true data, i.e. as fed to the transmitter. Output is

“open-collector” format with internal 10k

Ω pullup to Vcc (pin 17).

AF

pin 13

Buffered & filtered analogue output from FM demodulator. Standing DC bias of 1V approx. Useful for

test purposes or for driving external decoders. External load should be >10k

Ω // <100pF

TXD

pin 14

This DC-coupled transmitter modulation input will accept either serial digital data or high level linear

signals. Drive signal must be limited to 0V min, 3V max. See page 6 for suggested drive methods. Input

impedance >50k

Ω.

TX select

pin 15

Active-low Transmit select. 47k

Ω internal pull-up to Vcc.

RX select

pin 16

Active-low Receive select. 47k

Ω internal pull-up to Vcc.

Pin 15 TX

Pin 16 RX

Function

1

1

Power down (<10

µA)

1

0

Receiver enabled

0

1

Transmitter enabled

0

0

Self test loop-back*

* Loop-back allows the receiver to monitor the transmitted signal. Under these conditions the Tx

radiated signal level will be reduced to approximately -10dBm).

Vcc

pin 17

18

17

16

15

14

13

12

11

10

0V

Vcc

RX SELECT

TXD

TX SELECT

AF

RXD

RSSI/CD

0V

1

2

3

4

5

6

7

8

9

RF GND

Antenna

RF GND

0V

No pin

33 mm

30.48 mm

23 mm

5 mm

side view (through can)

top view (without can)

side view (with can)

recommended PCB hole size: 1.2 mm

module footprint size: 25 x 32 mm

pin pitch: 2.54 mm (0.1")

pins 4, 5, 6, 7

are not fitted

& 8

Fig. 3: Physical dimensions