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 10kΩ 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 >10kΩ // <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 >50kΩ.
TX select
pin 15
Active-low Transmit select. 47kΩ internal pull-up to Vcc.
RX select
pin 16
Active-low Receive select. 47kΩ internal pull-up to Vcc.
Pin 15 TX Pin 16 RX
Function
1
1
0
0
1
0
1
0
Power down (<10µA)
Receiver enabled
Transmitter enabled
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
DC +ve supply pin. +2.9 to +16 volts @ <14mA (@10mW). The supply should be clean, <20mVP-P ripple.
side view (through can)
side view (with can)
5 mm
top view (without can)
RF GND 1
18 0V
Antenna
2
RF GND
3
Vcc
RX SELECT
TX SELECT
17
16
15
4
5
6
23 mm
14 TXD
13 AF
No pin
7
8
9
12 RXD
11 RSSI/CD
10 0V
0V
recommended PCB hole size: 1.2 mm
module footprint size: 25 x 32 mm
pin pitch: 2.54 mm (0.1")
30.48 mm
33 mm
pins 4, 5, 6, 7 & 8 are not fitted
Fig. 3: Physical dimensions
Radiometrix Ltd, BiM2A Data Sheet
page 3
RADIOMETRIX [ RADIOMETRIX LTD ]
