Data Sheet

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)
VTX
Antenna (2)
Gnd (18)
2.2µF
VTX
VRX
10Ω
Vcc (17)
RX select (16)
433 MHz
band
pass filter
TX/RX
switch
NC (4)
Pre amplifier
GND (5)
44 kHz 2nd
order LPF
Buffer
RF GND (3)
TX select (15)
SAW-stabilised
oscillator
418 MHz
SAW controlled
1st Local
oscillator
NC (6)
NC (7)
TX/RX
Supply
Switch
SAW band
pass filter
10kΩ
2nd local
oscillator
15.82 MHz
2nd mixer
IF amplifier
demodulator
NC (8)
Adaptive Data Slicer
TXD (14)
AF (13)
-
AF 35kHz
Buffer
+
Data out (12)
VRX
CD (11)
st
1 mixer
Gnd (9)
47kΩ
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.
CD
pin 11
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 < 20mVP-P ripple. A 2.2µF decoupling capacitor and 10Ω series resistor are used internally to filter the supply.
side view
side views
4 mm
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 !
30.48 mm
33 mm
18
17
16
15
14
13
12
11
10
0 Volt
Vcc
RX select
TX select
TXD
AF
RXD
CD
0 Volt
23 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 :
-10°C to + 55°C
-20°C to + 70°C
Vcc (pin 17)
All other pins
Antenna (pin 2)
-0.1V to +10.0 V
-0.1V to +Vcc+0.6V
±50 V @ <10MHz , +20dBm @ > 10MHz
Note:
-40°C to + 100°C
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
min.
typ.
max.
units
17
17
17
17
17
17
17
13
12,13
11
4.0
3.0
10
6
12
10
1.0
220
5
3.3
14
8
18
14
1.25
-
5.5
4.0
16
10
21
17
20
1.5
100
-
V
V
mA
mA
mA
mA
mVpk-pk
V
pF
kΩ
12
12
-
Vcc-0.6
0.4
-
V
V
15, 16
15, 16
15,16
14
14
Vcc-0.5
0
Vcc-0.5
0
10
Vcc
0.5
Vcc
0.5
V
V
kΩ
V
V
pin
2
-
min.
-
typ.
50
433.92
max.
-
units
Ω
MHz
notes
TX or RX
2
2
-
+7
+3
-50
-100
20
DC
DC
-
+10
+6
0
0
30
-
+12
+8
+50
+100
40
32
80
15
dBm
dBm
kHz
kHz
kHz
kHz
kHz
%
5V
3.3V
-95
-91
-101
-96
-94
2, 13
2, 13
2, 13
dBm
dBm
dBm
notes
3.3V supply
3.3V supply
below 1MHz
Note 2
RXD high
RXD low
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
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 (fRF-2fIF)
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 IP3
2
+1
dBm
Radiations
RX LO leakage, conducted
RX LO leakage, radiated
TX 2nd 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, tPU-CD
Power up to stable AF, tPU-AF
Power up to stable data, tPU-data
Power up to stable data, tPU-data
Power up to stable data, tPU-data
Radiometrix Ltd, BiM2 Data Sheet
notes
5V
3.3V
160kbps
Note 2
Note 2
Note 2
Note 2
160kbps
peak to peak
CD centre
notes
402.0MHz
DC to 2GHz
2
2
2
2
-
-60
-70
-42
-40
-
-57
-36
-30
250
dBm
dBm
dBm
dBm
kHz
worst case
pin
min.
typ.
max.
units
notes
13
13
12
14
14
14
14
14
0.08
0.08
15.6
15.6
6.25
30
3
64
50
-
34
80
1000
120
100
70
-
kHz
kHz
kbps
µs
µs
µs
%
ms
TXD to AF
160kbps
14
14, 12
1
-
15
-
ms
µs
11
13
12
12
12
-
0.7
0.5
3
1
1
5
1
0.8
ms
ms
ms
ms
ms
-
S version
160kbps
in any 2ms
01010101
pattern
S version
TXD to RXD
Note 2
1, S version
160kbps
page 5
Baseband Transfer
Performance
Signal applied with supply on
Signal to valid CD, tsig-CD
Signal to stable data, tsig-data
Signal to stable data, tsig-data
Signal to stable data, tsig-data
TX power up to full RF
Notes:
pin
min.
typ.
max.
11
12
12
12
2
-
0.25
3
100
0.5
4
1
0.5
-
units
notes
ms
ms
ms
ms
µs
Note 2
1, S version
1. from 45% to 55% duty cycle
2. CD works up to a temperature of 40° C
Antenna requirements
Three types of integral antenna are recommended and approved for use with the module:
A) Helical
Wire coil, connected directly to pin 2, open circuit at other end. This antenna is very
efficient given it’s small size (20mm x 4mm dia.). The helical is a high Q antenna, trim
the wire length or expand the coil for optimum results. The helical de-tunes badly with
proximity to other conductive objects.
B) Loop
A loop of PCB track tuned by a fixed or variable capacitor to ground at the 'hot' end and
fed from pin 2 at a point 20% from the ground end. Loops have high immunity to
proximity de-tuning.
C) Whip
This is a wire, rod ,PCB track or combination connected directly to pin 2 of the module.
Optimum total length is 16cm (1/4 wave @ 433MHz). Keep the open circuit (hot) end
well away from metal components to prevent serious de-tuning. Whips are ground plane
sensitive and will benefit from internal 1/4 wave earthed radial(s) if the product is small
and plastic cased
Ultimate performance
Easy of design set-up
Size
Immunity proximity effects
Range open ground to similar antenna
A
helical
**
**
***
**
B
loop
*
*
**
***
C
whip
***
***
*
*
200m
The antenna choice and position directly controls the system range. Keep it clear of other metal in the
system, particularly the 'hot' end. The best position by far, is sticking out the top of the product. This is
often not desirable for practical/ergonomic reasons thus a compromise may need to be reached. If an
internal antenna must be used, try to keep it away from other metal components, particularly large
ones like transformers, batteries and PCB tracks/earth plane. The space around the antenna is as
important as the antenna itself.
Radiometrix Ltd, BiM2 Data Sheet
page 6
0.5 mm enameled copper wire
close wound on 3.2 mm diameter former
RF
433 MHz = 24 turns
A. Helical antenna
Feed point 15% to 25% of total loop length
RF-GND
track width = 1mm
2
C2
C3
C4
C1
4 to 10 cm inside area
RF
B. Loop antenna
16.4cm
C. Whip antenna
wire, rod, PCB-track or a combination
of these three
RF
433 MHz = 16.4 cm total from RF pin.
Figure 3: Antenna
Ordering information
The standard BiM2, order code BiM2-433-64 is supplied with pins fitted for operation on 5 volt
supplies (4 to 5.5v)
Versions and Variants
BiM2-433-64-3V
A 3 volt version is available, BiM-433-64-3V for operation at 3.3volts (3.0 to 4.0 V) it is
identical to the standard version but has been tested and aligned for operation at 3.3v.
BiM2-433-64-S
This is intended for RPC or Manchester code only and has fast settling time (maximum 1ms)
Additionally, for volume orders, Radiometrix can supply the BiM2 to the customers’ PCB pin
requirements or even without any pins.
BiM2-433-160-5V
This fast version BiM2 has a raw data rate of up to 160kbps. 3V version also available (BiM2433-160-3V).
Radiometrix Ltd, BiM2 Data Sheet
page 7
Radiometrix Ltd, BiM2 Data Sheet
page 8
Radiometrix Ltd, BiM2 Data Sheet
page 9
CE Certificate for BiM2-433-64 and its variants
Radiometrix Ltd, BiM2 Data Sheet
page 10
Radiometrix Ltd
Hartcran House
231 Kenton Lane
Harrow, Middlesex
HA3 8RP
ENGLAND
Tel: +44 (0) 20 8909 9595
Fax: +44 (0) 20 8909 2233
sales@radiometrix.com
www.radiometrix.com
Copyright notice
This product data sheet is the original work and copyrighted property of Radiometrix Ltd.
Reproduction in whole or in part must give clear acknowledgement to the copyright owner.
Limitation of liability
The information furnished by Radiometrix Ltd is believed to be accurate and reliable.
Radiometrix Ltd reserves the right to make changes or improvements in the design, specification
or manufacture of its subassembly products without notice. Radiometrix Ltd does not assume
any liability arising from the application or use of any product or circuit described herein, nor
for any infringements of patents or other rights of third parties which may result from the use of
its products. This data sheet neither states nor implies warranty of any kind, including fitness
for any particular application. These radio devices may be subject to radio interference and may
not function as intended if interference is present. We do NOT recommend their use for life
critical applications.
The Intrastat commodity code for all our modules is: 8542 6000.
R&TTE Directive
After 7 April 2001 the manufacturer can only place finished product on the market under the
provisions of the R&TTE Directive. Equipment within the scope of the R&TTE Directive may
demonstrate compliance to the essential requirements specified in Article 3 of the Directive, as
appropriate to the particular equipment.
Further details are available on The Office of Communications (Ofcom) web site:
http://www.ofcom.org.uk/radiocomms/ifi/licensing/licensing_policy_manual/
Information Requests
Ofcom
Riverside House
2a Southwark Bridge Road
London SE1 9HA
Tel: +44 (0)845 456 3000 or 020 7981 3040
Fax: +44 (0)20 7783 4033
information.requests@ofcom.org.uk
European Radiocommunications Office (ERO)
Peblingehus
Nansensgade 19
DK 1366 Copenhagen
Tel. +45 33896300
Fax +45 33896330
ero@ero.dk
www.ero.dk