Radiometrix BIM3G-869-15-5V 433 / 868mhz fm data transceiver Datasheet

Hartcran House, 231 Kenton Lane, Harrow, Middlesex, HA3 8RP, England
Tel: +44 (0) 20 8909 9595, Fax: +44 (0) 20 8909 2233, www.radiometrix.com
BiM2/BiM3G
PRELIMINARY
Issue 1, 11 November 2009
433 / 868MHz FM Data Transceiver
The BIM2/3G data radio module is a PLL
synthesiser based miniature PCB
mounting UHF radio transceiver which
enable the simple implementation of a
wireless data link at up to 128 kbps at
distances up to 75 metres in-building
and 300 metres open ground.
Features
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Data rates up to 128 kbps
Figure 1: BIM3G-869-64-5V
Usable range up to 300 m
Versions available on 433.92MHz, 434.42MHz and 868MHz band
Fully screened
Low profile with small footprint
Designed for compliance with EN 300 220-3 (radio) and EN 301 489-3 (EMC) standards
Available for operation at 433.92MHz, 434.42MHz and 868MHz band in the UK and Europe, these modules
combine full screening with extensive internal filtering to ensure EMC compliance by minimising spurious
radiations and susceptibilities. The BIM2/3G module will suit one-to-one and multi-node wireless links in
applications. Because of their small size and low power requirements, the module is ideal for use in portable,
battery-powered applications such as hand-held terminals.
Applications
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Data loggers
EPOS equipment, barcode scanners, belt clip printers
Audience response systems
In-building environmental monitoring and control
Security and fire alarms
Restaurant ordering systems
Vehicle data up/download
Technical Summary
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Crystal-locked PLL, FM modulated at up to 128 Kbps
+10dBm on 433.92MHz and 868MHz (Dependent on version)
High efficiency, >30%, DC to RF
2nd harmonic, > -60dBc
Single conversion FM superhet receiver
SAW front end filter gives >50dB image rejection
Sensitivity: -102dBm sensitivity @ 1ppm BER, 64kbps version
-108dBm sensitivity @ 1ppm BER, 15kbps version
TBA dBm sensitivity @ 1ppm BER, 128kbps version
RSSI output with 60dB range
Extremely low LO leakage, -125dBm typical
Supply: +5V (± 10%)
Current consumption: 10mA (typ.)
Size: 33 x 23 x 5mm
Evaluation platforms: Universal Evaluation Kit, NBEK + DIL carrier
Radiometrix Ltd, BIM2/3G Data Sheet
page 1
Functional overview
The transmit section of the BiM2/3G consists of a frequency modulated crystal locked PLL feeding a buffer
amplifier and RF filter. A Tx select line controls operation. The transmitter achieves full RF output typically
within 1ms of this line being pulled low. Modulation is applied at the TXD input and may be either a serial digital
stream toggling between 0V and 5V (digital drive) or a high level analogue waveform with the same peak limits
(linear drive). Modulation shaping is performed internally by a 2nd order lowpass filter, which minimises spectral
spreading. The RF output is filtered to ensure compliance with the appropriate regulations and fed via a Tx/Rx
changeover switch to the antenna pin.
The receive section is a single conversion FM superhet with an IF of 10.7MHz. A SAW bandpass filter in the
receiver front-end provides image rejection and suppression of other unwanted out-of-band signals. Like the
transmitter, the receiver is controlled by its own active low RX select line. A post-detection lowpass filter
establishes the signal bandwidth and ensures clean operation of the subsequent adaptive data slicer. The slicer
is optimised for balanced data such as bi-phase code. A received signal strength (RSSI) output with 60dB of
range is provided. A version of BiM2/3G featuring a fast acting Carrier Detect (CD) output on the same RSSI
pin is also available. The CD output will indicate the presence of any RF signals on the carrier frequency.
side view (through can)
side view (with can)
5 mm
top view (without can)
RF GND 1
Antenna 2
RF GND 3
4
5
No pin
6
7
8
0V 9
18 0V
17 Vcc
16 RX SELECT
15 TX SELECT
14 TXD
13 AF
12 RXD
11 RSSI/CD
10 0V
30.48 mm
33 mm
23 mm
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 & 8 are not fitted
Fig. 2: Physical dimensions
Pin description
RF GND
pins 1 & 3
RF ground pins, internally connected to the module screen and to pins 9, 10 & 18 (0V). These pins should be
connected directly to the RF return path (e.g. coax braid, main PCB ground plane etc).
Antenna
pin 2
50Ω RF connection to the antenna, DC-isolated. See pages 7 & 8 for details of suitable antennas and feeds.
0V (GND)
pins 9, 10 & 18
Supply ground connection and screen.
RSSI /CD
pin 11
RSSI variant: Received Signal Strength Indicator with 60dB range, operational when Rx is enabled. Output
voltage nominally 0.50Vdc (no signal), 1.0Vdc (maximum strength). See page.6 for typical characteristics.
Carrier Detect variant: When the receiver is enabled, a low indicates a signal above the detection threshold is
being received. The output is high impedance and should only be used to drive a CMOS logic input.
Radiometrix Ltd, BIM2/3G Data Sheet
page 2
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, 5V max. See page 7 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
Power down (<10µA)
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
+5V DC +ve supply pin. The supply should be clean, <20mVP-P ripple.
Radiometrix Ltd, BIM2/3G Data Sheet
page 3
Absolute maximum ratings
Exceeding the values below may cause permanent damage to the module.
Operating temperature
-20°C to +70°C
Storage temperature
-40°C to +100°C
Vcc (pin 17)
-0.3V to +16V(Dependant on version)
TX, RX select (pins 15, 16)
-9V to +5.5V
All other pins
-0.3V to +Vcc
Antenna (pin 2)
±50V DC, +10dBm RF
Performance specifications
Figures apply to standard version @ Vcc=5.0V, temperature +20°C, unless stated.
pin
17
17
min.
4.5
-
typ.
5.0
14
max.
5.5
-
units
V
mA
notes
Note 9
Note 9
17
2
15, 16
15, 16
15,16
12
12
12
10
Vcc-0.5
0
-
11
mA
MHz
Ω
V
V
kΩ
kbps
kbps
kbps
Note 1
Note 9
Tx or Rx
47
-
17
Vcc
0.5
128
64
15
To Vcc (pin 17)
-128 version
-64 version
-15 version
Transmitter section
RF power output
pin
2
min.
-
typ.
+10
max.
-
units
dBm
notes
Note 9
TX harmonics/spurious emission
Initial centre frequency accuracy
FM deviation
Modulation bandwidth
Modulation distortion
TX spectral bandwidth @-40dBc
TXD input level: high
low
TX power up to full RF
2
2
14
14
2
-10
±20
0
2.8
0
-
-55
0
±27
5
5
1
-40
+10
±35
65
10
250
0.2
1.5
dBm
kHz
kHz
kHz
%
kHz
V
V
ms
Peak
@ -3db
Note 2
worst case
Note 3
Note 3
Note 4
Receiver section
RF sensitivity, 10dB S/N
RF sensitivity, 1ppm BER
RF sensitivity, 1ppm BER
RF sensitivity, 1ppm BER
pin
2, 13
2, 12
2, 12
2, 12
min.
-
typ.
-113
-TBA
-102
-108
max.
-
units
dBm
dBm
dBm
dBm
-128 version
-64 version
-15 version
RSSI range
IF bandwidth
Image rejection (fRF-21.4MHz)
IF rejection (10.7MHz)
Local osc. leakage, conducted
Baseband bandwidth @ -3dB
Baseband bandwidth @ -3dB
Baseband bandwidth @ -3dB
AF output signal level
DC offset on AF output
Distortion on recovered AF
2, 11
2
2
2
13
13
13
13
13
13
50
100
0
0
0
200
1.5
-
60
180
54
-125
250
2.0
1
-110
65
50
7.8
350
2.5
5
dB
kHz
dB
dB
dBm
kHz
kHz
kHz
mV p-p
V
%
-128 version
-64 version
-15 version
Note 5
Note 6
Note 7
Load capacitance, AF & RXD
12, 13
-
-
100
pF
General
Supply voltage
Tx supply current
Rx supply current
RF centre frequency
Antenna port impedance
TX & RX select: high (deselect)
low (select)
Internal select pull-ups
Balanced code bit rate
Balanced code bit rate
Balanced code bit rate
Radiometrix Ltd, BIM2/3G Data Sheet
50
notes
page 4
Receiver section
pin
min.
typ.
max.
units
notes
Dynamic Timing
Rx power up with signal present
Power up to valid RSSI, tPU-RSSI
Power up to stable data, tPU-data
Power up to stable data, tPU-data
11
12
12
-
0.5
2
2
1
10
10
ms
ms
ms
-15 version
-64 version
Signal applied with Rx on
RSSI response time (rise/fall)
Signal to stable data, tsig-data
Signal to stable data, tsig-data
11
12
12
-
100
0.5
0.2
1
0.5
µs
ms
ms
-15 version
-64 version
Time between data transitions
Time between data transitions
Averaged code mark:space
14
14
14
70
15.6
20
50
5000
1500
80
µs
µs
%
-15 version
-64 version
Note 8
Note:
1. Increases at high RF input level (>-20dBm)
2. See page 6 for further details
3. For specified FM deviation
4. Tx select low > full RF output
5. ±30kHz FM deviation –15 and –64 versions on;y
6. Min/max at ±50kHz offset
7. Max at ±50kHz offset
8. Average, at max. data rate
9. Dependant on version
Power supply requirement
The power supply ripple/noise should be below 10mVp-p to avoid problems. If the quality of the supply is in
doubt, it is recommended that a 10µF low-ESR tantalum or similar capacitor be added between the module
supply pin (Vcc) and ground, together with a 10Ω series feed resistor between the Vcc pin and the supply rail.
The BIM2/3G incorporates a low voltage shutoff circuit, which prevents any possibility of erratic operation by
disabling the RF output of the transmitter if the supply voltage drops below 2.2V (±5%). This feature is selfresetting, i.e. restoring the supply to greater than 2.2V will immediately restore full RF output from the module.
The standard BiM2/3G requires a regulated 5V supply with ripple content <100mVpk-pk.
Received Signal Strength Indicator (RSSI)
The BIM2/3G module incorporates a wide range RSSI which measures the strength of an incoming signal over
a range of approximately 60dB. This allows assessment of link quality and available margin and is useful when
performing range tests.
Please note that the actual RSSI voltage at any given RF input level varies somewhat between units. The RSSI
facility is intended as a relative indicator only - it is not designed to be, or suitable as, an accurate and
repeatable measure of absolute signal level or transmitter-receiver distance.
The output on pin 5 of the module has a standing DC bias in the region of 0.5V with no signal, rising to around
1V at maximum indication. The RSSI output source impedance is high (~100kΩ) and external loading should
therefore be kept to a minimum.
To ensure a fast response the RSSI has limited internal decoupling of 1nF to ground. This may result in a small
amount of ripple on the DC output at pin 5 of the module. If this is a problem further decoupling may be added
at the expense of response speed, in the form of a capacitor from pin 5 to ground. For example, adding 10nF
here will increase RSSI response time from 100µs to around 1ms. The value of this capacitor may be increased
without limit.
Radiometrix Ltd, BIM2/3G Data Sheet
page 5
Typical RSSI characteristic is shown below (this is for indicative purposes only and is not a guarantee
of actual RSSI characteristics):
1100
1000
RSSI VOLTAGE
900
800
700
600
500
400
300
200
-130
-120
-110
-100
-90
-80
-70
-60
-50
RF input level (dBm)
Figure 3: Typical RSSI
Module mounting considerations
Good RF layout practice should be observed – in particular, any ground return required by the antenna or feed
should be connected directly to the RF GND pin at the antenna end of the module, and not to the OV pin which
is intended as a DC ground only. All connecting tracks should be kept as short as possible to avoid any
problems with stray RF pickup.
If the connection between module and antenna does not form part of the antenna itself, it should be made using
50Ω microstrip line or coax or a combination of both. It is desirable (but not essential) to fill all unused PCB
area around the module with ground plane.
The module may be potted if required in a viscous compound which cannot enter the screen can.
Warning: DO NOT wash the module. It is not hermetically sealed.
Radiometrix Ltd, BIM2/3G Data Sheet
page 6
Application Information
Modulation formats and range extension
The module will produce the specified FM deviation with a 2-level digital input to TXD which toggles between
0V and 5V. Reducing the amplitude of the data input from this value reduces the transmitted FM deviation,
typically to ±20-22kHz minimum at 0 - 2.8V. The receiver will cope with this quite happily and no significant
degradation of link performance should be observed.
TXD is normally driven directly by logic levels but will also accept analogue drive, e.g. 2-tone signalling. In this
case it is recommended that TXD (pin 14) should be DC-biased to 1.5V with the modulation AC-coupled and
limited to a maximum of 3V peak-to-peak. The instantaneous modulation voltage must not swing below 0V or
above 3V at any time if waveform distortion and excessive FM deviation is to be avoided – use a resistive
potential divider and/or level shifter to accomplish this if necessary. The varactor modulator in the transmitter
introduces some 2nd harmonic distortion which may be reduced if necessary by predistortion of the analogue
waveform.
At the other end of the link the AF output (pin 13) can be used to drive an external decoder directly.
Although the module baseband response extends down to DC, data formats containing a DC component are
unsuitable and should not be used. This is because frequency errors and drifts between the transmitter and
receiver occur in normal operation resulting in DC offset errors on the AF output.
The time constant of the adaptive data slicer in the BiM2/3G is set at a reasonable compromise to allow the use
of low code speeds where necessary whilst keeping settling times acceptably fast for battery-economised
operation. RXD output on pin 12 is “true” sense, i.e. as originally fed to the transmitter.
Antenna considerations and options
The choice and positioning of transmitter and receiver antennas is of the utmost importance and is the single
most significant factor in determining system range. The following notes are intended to assist the user in
choosing the most effective arrangement for a given application.
Nearby conducting objects such as a PCB or battery can cause detuning or screening of the antenna which
severely reduces efficiency. Ideally the antenna should stick out from the top of the product and be entirely in
the clear, however this is often not desirable for practical or ergonomic reasons and a compromise may need to
be reached. If an internal antenna must be used, try to keep it away from other metal components and pay
particular attention to the “hot” end (i.e. the far end), as this is generally the most susceptible to detuning. The
space around the antenna is as important as the antenna itself.
Microprocessors and microcontrollers tend to radiate significant amounts of radio frequency hash, which can
cause desensitisation of the receiver if its antenna is in close proximity. 433MHz is generally less prone to this
effect than lower frequencies, but problems can still arise. Things become worse as logic speeds increase,
because fast logic edges are capable of generating harmonics across the UHF range which are then radiated
effectively by the PCB tracking. In extreme cases system range can be reduced by a factor of 3 or more. To
minimise any adverse effects, situate the antenna and module as far as possible from any such circuitry and
keep PCB track lengths to the minimum possible. A ground plane can be highly effective in cutting radiated
interference and its use is strongly recommended.
A simple test for interference is to monitor the receiver RSSI output voltage, which should be the same
regardless of whether the microcontroller or other logic circuitry is running or in reset.
Radiometrix Ltd, BIM2/3G Data Sheet
page 7
Three types of integral antenna are recommended:
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 detuning.
C) Whip
This is a wire, rod, PCB track or combination connected directly to pin 2 of the module.
Optimum total length is 15.5cm (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
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.
Fig.4: Antenna configuration (BiM2G @ 433.92MHz)
Ultimate performance
Easy of design set-up
Size
Immunity proximity effects
Range open ground to similar antenna
helical
**
**
***
**
200m
loop
*
*
**
***
100m
whip
***
***
*
*
300m
(for BiM2G-433-15)
Antenna selection chart
Radiometrix Ltd, BIM2/3G Data Sheet
page 8
Duty Cycle requirements
The duty cycle is defined as the ratio, expressed as a percentage, of the maximum transmitter “on” time on one
or more carrier frequencies, relative to a one hour period. Where an acknowledgement message is required,
the additional transmitter “on” time shall be included.
There is a 10% duty cycle restriction on 433.050-434.790 MHz band in most of the EU member states.
The BIM2G is a RF module intended to be incorporated into a wide variety of applications and finished
products, Radiometrix has no control over the end use of the BIM2G.The harmonised band 433.050 to 434.790
MHz as detailed in Annex 1 Band E of CEPT/ERC Recommendation 70-03 (which can be downloaded at
http://www.ero.dk/scripts/docmanag98/dm.dll/QueryDoc?Cat=Recommendation)
has list of countries where Duty Cycle restriction apply.
Module users should, therefore, ensure that they comply with the stated Duty Cycle requirements of the version
of CEPT/ERC Recommendation 70-03 in place at the time of incorporation of the BIM2G into their product.
Please refer to Appendix A for duty cycle information on 868MHz band in which the BiM3G operates.
Variants and ordering information
The following variants are standard:
Part number
RF power (dBm)
RSSI versions
BIM2G-433-15-5V
+10
BIM2G-433-64-5V
+10
BIM2G-433-128-5V
+10
Data rate (kbps)
Frequency (MHz)
15
64
128
433.92
433.92
433.92
BIM2G-434-15-5V
BIM2G-434-64-5V
BIM2G-434-128-5V
+10
+10
+10
15
64
128
434.42
434.42
434.42
BIM3G-869-15-5V
BIM3G-869-64-5V
BIM3G-869-128-5V
+5
+5
+5
15
64
128
869.85MHz
869.85MHz
869.85MHz
BIM3G-868-15-5V
BIM3G-868-64-5V
BIM3G-868-128-5V
+10
+10
+10
15
64
128
868.3MHz
868.3MHz
868.3MHz
CD versions
BIM2G-433-15-CD-5V
BIM2G-433-64-CD-5V
BIM2G-433-128-CD-5V
+10
+10
+10
15
64
128
433.92
433.92
433.92
BIM2G-434-15-CD-5V
BIM2G-434-64-CD-5V
BIM2G-434-128-CD-5V
+10
+10
+10
15
64
128
434.42
434.42
434.42
BIM3G-869-15-CD-5V
BIM3G-869-64-CD-5V
BIM3G-869-128-CD-5V
+5
+5
+5
15
64
128
869.85MHz
869.85MHz
869.85MHz
BIM3G-868-15-CD-5V
BIM3G-868-64-CD-5V
BIM3G-868-128-CD-5V
+10
+10
+10
15
64
128
868.3MHz
868.3MHz
868.3MHz
For other frequency variants, please contact sales department.
Evaluation platforms:
1. Universal Evaluation Kit
2. NBEK + BiM carrier
Radiometrix Ltd, BIM2/3G Data Sheet
page 9
Radiometrix Ltd, BIM2/3G Data Sheet
10
100
500
868.0
[mW]
600kHz
25mW
<1% or LBT
Duty Cycle
868.60
100kHz
868.70
10mW
<1%
25kHz or
WB
No Spacing
Channel Spacing
Applications
Alarm
RF POWER [ERP]
Non-specific SRD
500kHz
<1%
25kHz
869.25
250kHz
500mW
869.65
869.70
50kHz
25mW
<10% or LBT <10%
869.30 869.40
50kHz 50kHz 100kHz
869.20
No Spacing
25kHz
25kHz
or Wide Band
300kHz
5mW
870.0
up to 100%
Non-specific
SRD
Alarm
Non-specific SRD
10mW 10mW 10mW
<0.1%
<0.1% or LBT
25mW
25kHz
Social Alarm
Alarm
No Spacing
Non-specific SRD
CEPT/ERC Rec 70-03, 868 MHz Band Plan
[MHz]
Appendix A
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
[email protected]
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/
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
[email protected]
European Radiocommunications Office (ERO)
Peblingehus
Nansensgade 19
DK 1366 Copenhagen
Tel. +45 33896300
Fax +45 33896330
[email protected]
www.ero.dk
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