Radiometrix
Hartcran House, 231 Kenton Lane, Harrow, HA3 8RP, England
Tel: +44 (0) 20 8909 9595, Fax: +44 (0) 20 8909 2233
Issue 2, 01 November 2004
BiM2
433MHz high speed FM radio transceiver module
The BiM2 transceiver is an enhanced
replacement for our original BiM module. It
offers greater transmit power, higher data
rates, greatly improved receiver interference
rejection and a lower profile. The module is
ideal for enabling bi-directional wireless
connectivity in battery powered or handheld
applications
Features
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BiM2–433-160
CE Certified by independent Notified Body according to the R&TTE Directive (1999/5/EC)
Verified to comply with Radio standard ETSI EN 300 220-3 by UKAS accredited Test Laboratory
Verified to comply with EMC standard ETSI EN 301 489-3 by UKAS accredited Test Laboratory
Usable range to 200 metres external, 50 metres in building
Data rates up to 160kbps
SAW controlled 10mW FM transmitter
Double conversion FM superhet receiver
SAW front end filter and full screening
Plug in replacement for Radiometrix BiM-433-40
3V or 5Volt supply at < 20mA
The BiM2 is a half duplex radio transceiver module for use in high-speed bi-directional data transfer
applications at ranges up to 200metres. The module operates on the European licence exempt frequency
of 433.92MHz. The small footprint of 23 x 33mm and low profile of 4mm together with low power
requirements of <20mA @ 3 to 5 Volts enable convenient PCB installation.
Applications
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PDA’s, organizers and laptops
Handheld terminals
EPOS equipment, barcode scanners, belt clip printers
Data loggers
Audience response systems
In Building environmental monitoring and control
High end security and fire alarms
Restaurant ordering systems
Vehicle data up/download
Further information will be available imminently, however, BiM-433-F data sheets contains
applications information that is equally applicable to the new BiM2.
Radiometrix Ltd, BiM2 Data Sheet
page 1
Functional overview
The transmit section of the BiM2 comprises of a SAW stabilised and FM modulated 433.92MHz oscillator feeding a
10mW buffer/output stage. Operation is controlled by a TX select line, the output achieving full power within 100µs of
this line being pulled low. Modulation is applied at the TXD input and may be either a serial digital stream at the same
levels as the module's supply rails (digital drive) or a high level analogue waveform with a pk to pk amplitude close to
the modules supply level (linear drive). Modulation shaping is performed internally by a 2nd order 44kHz LPF to
minimize spectral spreading. The RF output is filtered to meet the requirements of EN 300-220-3 and fed via a fast
antenna changeover switch to the 50Ω antenna pin.
The receive section of the BiM2 is a double conversion FM superhet with IF’s of 16MHz and 150kHz. The dual gate
MOSFET LNA is followed by a 750kHz bandwidth SAW filter to provide >60 dB’s rejection of all out of band signals.
The receiver is controlled by an active low select line and will power up in <1ms. A post-detection 2nd order 35kHz LPF
establishes the signal bandwidth and ensures the clean operation of the subsequent adaptive data slicer. The slicer has a
2ms averaging time constant and is optimised for balanced data, e.g. bi-phase codes. A fast acting carrier detect output
will indicate the presence of any RF signals.
GND (1)
V
TX
V
TX
V
RX
2.2
µ
F
TX/RX
Supply
Switch
nd
Gnd (18)
10Ω
Vcc (17)
RX select (16)
Antenna (2)
RF GND (3)
NC (4)
GND (5)
NC (6)
NC (7)
NC (8)
433 MHz
band
pass filter
TX/RX
switch
Buffer
SAW-stabilised
oscillator
418 MHz
SAW controlled
1st Local
oscillator
44 kHz 2
order LPF
TX select (15)
TXD (14)
AF (13)
Data out (12)
V
RX
Pre -
amplifier
10kΩ
2
nd
local
oscillator
15.82 MHz
2
nd
mixer
IF amplifier
demodulator
AF 35kHz
Buffer
Adaptive Data Slicer
-
+
SAW band
pass filter
1 mixer
st
CD (11)
47kΩ
Gnd (9)
GND (10)
Figure 1: Block diagram
Pin description:
RF GND
pin 1 & 3
RF ground pin, internally connected to the module screen and pin 5, 9, 10, 18 (0 Volt). This pin should
be connected to the RF return path (e.g. coax braid, main PCB ground plane etc.)
Antenna
pin 2
50Ω RF input from the antenna, it is DC isolated internally. (see antenna for suggested antenna/feeds).
0Volt
pins 5, 9, 10, 18
Supply ground connection and screen.
pin 11
CD
Carrier Detect - When the receiver is enabled, a low indicates a signal above the detection threshold is
being received. The output is high impedance (50kΩ) and should only be used to drive a CMOS logic
input.
RXD
pin 12
This digital output from the internal data slicer is a squared version of the signal on pin 13 (AF). It may
be used to drive external decoders. The data is true data, i.e. as fed to the transmitter. Load impedance
should be >1kΩ and <1nF
Radiometrix Ltd, BiM2 Data Sheet
page 2
AF
pin 13
This is a buffered and filtered analogue output from the FM demodulator. It has a standing DC bias of
1.2 volts and 400mV
P-P
base band signal. It is useful as a test point or to drive linear decoders. Load
impedance should be >2kΩ and <100pF.
TXD
pin 14
This DC coupled modulation input will accept either serial digital data (0V to Vcc levels) or High level
linear signals. Input impedance is 10kΩ.
TX select
pin 15
Active low transmit select. 10kΩ internal pull up to Vcc.
RX select
pin 16
Active low receive select. 10kΩ internal pull up to Vcc.
Pin 15 TX
1
1
0
0
Pin 16 RX
1
0
1
0
Function
power down (<1µA)
receiver enabled
transmitter enabled
self test loop back
Note:
Loop test allows the receivers to monitor the transmitted signal. The receiver will not receive
external signals whilst the TX of the module is enabled.
Vcc
pin 17
+ve supply pin. +3.0 to +5.5 volts @ <20mA . The supply must be clean < 20mV
P-P
ripple. A 2.2µF de-
coupling capacitor and 10Ω series resistor are used internally to filter the supply.
side view
4 mm
side views
top view
RF GND 1
Antenna 2
RF GND 3
NC 4
GND 5
NC 6
NC 7
NC 8
GND 9
BiM2-433-160
0889 !
18
17
16
15
14
13
12
11
10
0 Volt
Vcc
RX select
TX select
TXD
AF
RXD
CD
0 Volt
23 mm
30.48 mm
33 mm
recommended PCB hole size: 1.2 mm
pin pitch: 2.54 mm
Figure 2: Physical dimension
Weight: 5g (typical with pins)
Radiometrix Ltd, BiM2 Data Sheet
page 3
Survival Maximums:
Operating temperature:
Extended operation at
Reduced specification
Storage temperature :
Vcc (pin 17)
All other pins
Antenna (pin 2)
Note:
-10°C to + 55°C
-20°C to + 70°C
-40°C to + 100°C
-0.1V to +10.0 V
-0.1V to +Vcc+0.6V
±50 V @ <10MHz , +20dBm @ > 10MHz
Operation of the BiM2 above 5.5 volt with efficient antenna may result in radiated power levels above the
licensed power level.
Figures apply to 5V versions unless otherwise noted
Temperature 20° C unless noted
Electrical Performance
DC Levels
supply voltage, Vcc
(std. version)
supply voltage, Vcc
(3V version)
TX supply current, Vcc
(std)
TX supply current, Vcc
(3.3V)
RX supply current, Vcc
(std)
RX supply current, Vcc
(3.3V)
supply ripple allowed
AF output DC level
load capacitance on AF / Data
CD output load resistance
Interface levels
data output high, 100µA source
data output low, 100µA sink
TX & RX select, high
(deselect)
low
(select)
Internal select pull-ups
TXD, high
low
RF Parameters
Antenna pin impedance
RF centre frequency
Transmitter
RF power output, Vcc std
RF power output, Vcc 3.3V
Initial frequency accuracy
Overall frequency accuracy
FM deviation
Modulation bandwidth
Modulation bandwidth
Modulation distortion
Receiver
RF sensitivity, 10dB S/N
RF sensitivity, 10dB S/N
RF sensitivity, 10dB S/N
Radiometrix Ltd, BiM2 Data Sheet
pin
17
17
17
17
17
17
17
13
12,13
11
min.
4.0
3.0
10
6
12
10
-
1.0
-
220
typ.
5
3.3
14
8
18
14
-
1.25
-
-
max.
5.5
4.0
16
10
21
17
20
1.5
100
-
units
V
V
mA
mA
mA
mA
mV
pk-pk
V
pF
kΩ
notes
3.3V supply
3.3V supply
below 1MHz
Note 2
12
12
15, 16
15, 16
15,16
14
14
pin
2
-
-
-
Vcc-0.5
0
-
Vcc-0.5
0
min.
-
-
Vcc-0.6
0.4
-
-
Vcc
0.5
-
Vcc
0.5
max.
-
-
V
V
V
V
kΩ
V
V
units
Ω
MHz
RXD high
RXD low
10
typ.
50
433.92
notes
TX or RX
2
2
-
-
-
-
-
2, 13
2, 13
2, 13
+7
+3
-50
-100
20
DC
DC
-
-95
-91
+10
+6
0
0
30
-
-
-
-101
-96
-94
+12
+8
+50
+100
40
32
80
15
dBm
dBm
kHz
kHz
kHz
kHz
kHz
%
dBm
dBm
dBm
5V
3.3V
160kpbs
3.3V
160kbps
page 4
RF Parameters
RF sensitivity, 1ppm BER
RF sensitivity, 1ppm BER
RF sensitivity, 1ppm BER
CD threshold , Vcc = 5V
CD threshold, Vcc = 3V
CD threshold, Vcc = 5V
IF bandwidth, Vcc = 5V, 160kbps
CD bandwidth
Ultimate (S+N)/N,
-70dBm input
Ultimate (S+N)/N,
-70dBm input
maximum operating RF input
AF output level
Initial frequency accuracy
pin
2, 12
2, 12
2, 12
2, 11
2, 11
2, 11
-
2, 11
13
13
2
13
-
min.
-87
-82
-98
-92
-
-
-
-
-
-50
typ.
-93
-88
-90
-104
-98
-96
500
400
>40
30
+10
400
0
max.
-
-
-
-
-
+50
units
dBm
dBm
dBm
dBm
dBm
dBm
kHz
kHz
dB
dB
dBm
mV
kHz
notes
5V
3.3V
160kbps
Note 2
Note 2
Note 2
Note 2
160kbps
peak to peak
CD centre
notes
EMC Parameters
pin
min.
typ.
max.
units
Rejections: rejection figures are relative to a 15dB (S+N)/N wanted signal
Co-channel rejection
2
-
-10
-
dB
Image rejection (f
RF
-2f
IF
)
2
-
64
-
dB
Out of band rejection
2
-
>70
-
dB
AM rejection
2
-
>30
-
dB
Out of band blocking level
2
-
>-15
-
dBm
Out of band IP
3
2
-
+1
-
dBm
Radiations
RX LO leakage, conducted
RX LO leakage, radiated
TX 2
nd
harmonic
TX harmonics >1GHz
TX spectral bandwidth @-40dBc
Baseband Transfer
Performance
TX
#
RX
Linear baseband BW @-3dB
Linear baseband BW @-3dB,
Balance code bit rate
Time between code transitions
Time between code transitions
Time between code transitions
Averaged code mark:space
preamble duration
preamble duration
link delay
Dynamic Timing
Power up with signal present
Power up to valid CD, t
PU-CD
Power up to stable AF, t
PU-AF
Power up to stable data, t
PU-data
Power up to stable data, t
PU-data
Power up to stable data, t
PU-data
402.0MHz
DC to 2GHz
2
-
2
2
2
pin
-
-
-
-
-
min.
-60
-70
-42
-40
-
typ.
-57
-
-36
-30
250
max.
dBm
dBm
dBm
dBm
kHz
units
worst case
notes
13
13
12
14
14
14
14
14
14
14, 12
0.08
0.08
-
15.6
15.6
6.25
30
3
1
-
-
-
64
-
-
-
50
-
-
15
34
80
-
1000
120
100
70
-
-
-
kHz
kHz
kbps
µs
µs
µs
%
ms
ms
µs
TXD to AF
160kbps
S version
160kbps
in any 2ms
01010101
pattern
S version
TXD to RXD
11
13
12
12
12
-
-
-
-
-
0.7
0.5
3
-
1
1
5
1
0.8
ms
ms
ms
ms
ms
Note 2
1, S version
160kbps
Radiometrix Ltd, BiM2 Data Sheet
page 5
51mcu
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