ETC BIM2-433-64

EW
N
Radiometrix
433MHz high speed FM radio transceiver module
Issue D, 01 February 2001
BiM2-433-64
Advanced data is provided to assist in engineering evaluation.
The data provided is believed to be accurate but may be subject to change.
This is not a specification
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 bidirectional wireless connectivity in battery
powered or handheld applications
Features
Conformity to EN 300-220-1, ETS 300-683
Usable range to 200 metres external, 50 metres in
building
Data rates to 64kbit/s
SAW controlled 10mW FM transmitter
Double conversion FM superhet receiver
SAW front end filter and full screening
Plug in replacement for Radiometrix BiM-433-F
3-5Volt supply at < 20mA
BiM2-433-64
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 and conforms to the relevant sections of EN 300-220 and ETS 300-683. 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. The high raw data rate capability of
64kbit/s and fast state change times will support high data throughput of up to 3 kbyte/s in
‘streaming’ applications or alternatively allows very short air time utilization (TX on < 10 ms) in
multi-node scanning networks.
Applications
•
•
•
•
•
•
•
•
•
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, BiM2-433-64 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 100us
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 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
433 MHz
band
pass filter
VRX
GND (5)
44 kHz 2nd
order LPF
Buffer
Vcc (17)
TX select (15)
SAW-stabilised
oscillator
Pre amplifier
418 MHz
SAW controlled
1st Local
oscillator
NC (6)
NC (7)
10Ω
RX select (16)
TX/RX
switch
RF GND (3)
NC (4)
TX/RX
Supply
Switch
2nd local
oscillator
15.82 MHz
Adaptive Data Slicer
Data out (12)
nd
2 mixer
IF amplifier
demodulator
NC (8)
AF (13)
-
AF 35kHz
SAW band
pass filter
TXD (14)
10kΩ
+
Buffer
VRX
CD (11)
st
1 mixer
Gnd (9)
47kΩ
GND (10)
Figure 1: Block diagram
Pin description:
pin 1 & 3
RF GND
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.)
pin 2
Antenna
50Ω RF input from the antenna, it is DC isolated internally. (see antenna for suggested
antenna/feeds).
pins 5, 9, 10, 18
0Volt
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.
pin 12
RXD
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, BiM2-433-64 Data Sheet
page 2
pin 13
AF
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.
pin 14
TXD
This DC coupled modulation input will accept either serial digital data (0V to Vcc levels) or High
level linear signals. Input impedance is 10kΩ.
pin 15
TX select
Active low transmit select. 10kΩ internal pull up to Vcc.
pin 16
RX select
Active low receive select. 10kΩ internal pull up to Vcc.
Pin 15 TX
Pin 16 RX
Function
1
1
1
0
power down (<1µA)
receiver enabled
0
1
transmitter enabled
0
0
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.
pin 17
Vcc
+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
433-64
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
Radiometrix Ltd, BiM2-433-64 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
pin
min.
typ.
max.
units
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
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
Interface levels
data output high, 100µA source
data output low, 100µA sink
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
min.
typ.
max.
units
notes
Antenna pin impedance
RF centre frequency
2
-
-
50
433.92
-
Ω
MHz
TX or RX
Transmitter
RF power output, Vcc std
RF power output, Vcc 3.3V
Initial frequency accuracy
Overall frequency accuracy
FM deviation
Modulation bandwidth
Modulation distortion
2
2
-
+7
+3
-50
-100
20
DC
-
+10
+6
0
0
30
-
+12
+8
+50
+100
40
32
15
dBm
dBm
kHz
kHz
kHz
kHz
%
5V
3.3V
TX & RX select, high (deselect)
low (select)
Internal select pull-ups
TXD, high
low
RF Parameters
Radiometrix Ltd, BiM2-433-64 Data Sheet
notes
5V supply
3.3V supply
5V supply
3.3V supply
below1MHz
RXD high
RXD low
page 4
RF Parameters
pin
min.
typ.
max.
units
notes
Receiver
RF sensitivity, 10dB S/N, 5V
RF sensitivity, 10dB S/N, 3.3V
RF sensitivity, 1ppm BER, 5V
RF sensitivity, 1ppm BER, 3.3V
CD threshold, Vcc = 5V
CD threshold, Vcc = 3.3V
IF bandwidth
CD bandwidth
Ultimate (S+N)/N, -70dBm input
maximum operating RF i/p
AF output level
Initial frequency accuracy
2, 13
2, 13
2, 12
2, 12
2, 11
2, 11
2, 11
13
2
13
-
-95
-91
-87
-82
-98
-92
-50
-101
-96
-93
-88
-104
-98
500
400
>40
+10
400
0
+50
dBm
dBm
dBm
dBm
dBm
dBm
kHz
kHz
dB
dBm
mV
kHz
peak to peak
CD centre
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
Balance code bit rate
Time between code transitions
Average code mark:space
preamble duration
2
2
2
2
-
-57
-36
-30
250
dBm
dBm
dBm
dBm
kHz
worst case
typ.
max.
units
notes
TXD to AF
min.
13
12
14
14
14
0.08
15.6
30
3
64
50
-
34
1000
70
-
kHz
kbit/s
µs
%
ms
14, 12
-
15
-
µs
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
11
13
12
-
0.7
0.5
3
1
1
4
ms
ms
ms
Signal applied with supply on
Signal to valid CD, tsig-CD
Signal to stable data, tsig-data
TX power up to full RF
11
12
2
-
0.25
3
100
0.5
5
-
ms
ms
µs
Radiometrix Ltd, BiM2-433-64 Data Sheet
402.0MHz
DC to 2GHz
-60
-70
-42
-40
-
pin
link delay
notes
in any 2ms
01010101
pattern
TXD to RXD
page 5
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
0.5 mm enameled copper wire
close wound on 3.2 mm diameter former
RF
433 MHz = 24 turns
A. Helical antenna
RF
feed point2 15% to 25% of total loop length
track width = 1mm
4 to 10 cm inside area
RF-GND
capacitor = 1.5 to 5 pF variable or fixed
B. Loop antenna
15.5cm
C. Whip antenna
Radiometrix Ltd, BiM2-433-64 Data Sheet
wire, rod, PCB-track or a combination
of these three
RF
433 MHz = 15.5 cm total from antenna pin 2.
page 6
Radiometrix Ltd
4 Hartcran House
Gibbs Couch
Watford WD19 5EZ
ENGLAND
Tel: 020 8428 1220
Fax:020 8428 1221
Int ": +44 20 8428 1220
www.radiometrix.co.uk
[email protected]
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.
Radio and EMC regulations
The Intrastat commodity code for all our modules is: 8542 4090.
The purchaser of Radiometrix subassemblies must satisfy all relevant EMC and other
regulations applicable to their finished products.
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
Radiocommunications Agency (RA) web site: www.radio.gov.uk/document/libind.htm#emc
The Information and Library Service
Radiocommunications Agency
Wyndham House, Marsh Wall
London E14 9SX
United Kingdom
Tel: +44 (0)20 7211 0502 or 0505
Fax: +44 (0)20 7211 0507
E-mail: [email protected]
(End of BiM2-433-64 Advanced Engineering Data)
Radiometrix Ltd, BiM2-433-64 Data Sheet
page 7