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
COR3
The COR3 is a 25kHz channel narrowband
multichannel Category 1 compliant receiver
intended for European 869.2-869.25MHz
Social Alarm application. It can also be used
for any 868-870MHz band Non-Specific SRD
applications. The module offers a low power,
reliable data link in an industry-standard pin
out and footprint.
27 July 2012, Issue 1
NBFM Multi-channel receiver for 868MHz SRD band
Figure 1: COR3-869-5-SAL receiver
Features
Conforms to EN 300 220-2 (Category 1) and EN 301 489-3
High performance double superhet, PLL Synthesizer with TCXO
SAW front end filter
Data rates up to 5 kbps for standard module
Fully screened
Feature-rich interface (RSSI, analogue and binary digital data outputs)
User configurable via microcontroller UART
Low power requirements
Applications
Social
Alarm
Handheld
terminals
Heavy
vehicle/machine remote controls
EPOS
equipment, barcode scanners
Data
loggers
Industrial
telemetry and telecommand
In-building
environmental monitoring and control
High-end
security and fire alarms
Vehicle
data up/download
Technical Summary
Social Alarm frequencies: CH0: 869.2125MHz, CH1: 869.2375MHz
Custom frequency within 865MHz - 870MHz
Up to 32 channels controlled via UART interface (16 parallel selected)
Supply range: 4.5V - 15V
Current consumption: 25mA receive
Data bit rate: 5kbps max. (standard module)
Receiver sensitivity: -120dBm (for 12 dB SINAD)
Size: 57 x 26 x 9mm
Evaluation platforms:
NBEK + COR3 carrier
Radiometrix Ltd, COR3 Data Sheet
page 1
Radiometrix Ltd, COR3 Data Sheet
Figure 2: COR3 block diagram
page 2
Figure 3: COR3 Flat mounted footprint
Pin Description - COR3
Pin
1A
2A
1
2
3
4
5
6
7
8
9
Notes:
1.
2.
3.
4.
There is no pull-up on the open collector RXD output.
P0-P3 are inverted parallel frequency select inputs. They have 10k pullups to 4.4V
P0 requires a 4.4V level UART (inverted RS232) serial command strings for programming
A version of the LMR2 firmware is used (so most variants of the LM_series will also be
possible for the COR3
5. Two pinout versions are offered: With conventional pins, out of the bottom of the unit (flat
mount) and with right-angle pins, to allow 'SIL' vertical mounting.
6. The actual pinout and footprint follows the NRX1/NRX2 type radio, with the addition of P0-
P3
Name
RF in
RF GND
RSSI
GND
Vcc
AF
RXD
P0/PGM
P1
P2
P3
Function
50Ω RF input from antenna
RF ground, internally connected to the module screen and pin 2 (0V)
DC level between 0.5V and 2.5V. 60dB dynamic range
Ground (0V)
Supply input 4.5V – 15V DC
700mV p-p audio. DC coupled, approx 1V bias
Open collector output of data slicer suitable for Bi-phase codes
Requires external pull-up resistor to required output voltage level
Parallel Channel select LSB
Serial frequency programming / configuration
1
Parallel Channel select
Parallel Channel select
Parallel Channel select MSB
Radiometrix Ltd, COR3 Data Sheet
page 3
COR3 serial configuration commands
Serial data is sent to the unit on one of the parallel channel select pins (P0). It is very important that the unit
does not 'decode' switch bounce in ordinary operation as a command string, or spurious re-writing of the
e2prom will result. For this reason the user must send the 16-character string ENABLESERIALMODE
(followed by a carriage return) to fully enable the serial command mode before sending any of the command
strings listed below. Command mode is disabled on power down, or on reception of a # character. You must
power the unit to successfully program it.
2400 baud, 8 bit data, no parity, 1 start bit, 1 or 2 stop bits, No flow control, 4.4V level UART (inverted
RS232)
Serial select of channel aa (0 to 31)
GOCHAN aa
Set value of N for channel aa (channels 0 to 31)
LOAD aa nnnnn
Channel selected by 4 bit parallel input (0 to 15)
SETPAR
Channel selected by most recent 'gochan' operation
SETSER
Enter value for R register
RVALUE rrrr
Set value of N for single channel operation. N value NOT stored in eeprom
SINGLE nnnnn
Process entry
<cr>
Clear all buffers
/
Disable command mode
#
aa = a two digit channel number from 00 to 31
nnnnn = synthesizer N register value, (up to 65535)
rrrr = synthesizer R register value, (up to 16383)
R
½
f
Xtal
f
channelspacing
½
13
MHz
, So R=520
25
kHz
N
½
f
RF
IF
f
Channelspacing
½
868 MHz
45 MHz
½
32920
25kHz
Notes:
1. When If an N value greater than 65536 is needed then an offset of +65536 can be selected
by setting bit 15 of the R value high
2. A pause of at least 50ms must be allowed between command strings (EEPROM
programming time) SINGLE mode does not store the N value in EEPROM. Therefore the
unit is inoperative after a power down until either another valid SINGLE command is
received, or mode is changed by a GOCHAN, SETPAR or SETSER command. SINGLE
mode is intended for frequency agile applications.
3. /SETPAR command should be issued at the end of channel programming to put the module
back into parallel frequency select mode
4. User can modify the frequency table of 32channels to any desired frequency by changing N,
R values of synthesizer within
1.5MHz of factory set Channel 0 frequency subject to the
Radio Regulatory Band Allocation in the country of intended use.
Radiometrix Ltd, COR3 Data Sheet
page 4
Condensed specifications
Frequency
Social ALarm (SAL) variant: CH0:869.2125MHz, CH1:869.2375MHz
User customisable frequencies: 865MHz – 870MHz
(Versions on any other UHF should, in principle, be possible depending
on SAW filter availability)
1.5kHz
25kHz
32 channels controlled via UART interface (16 parallel selected)
4.5V - 15V DC
25mA
-20
ο
C to +55
ο
C (Storage -30
ο
C to +70
ο
C)
57 x 26 x 9 mm
Compliant with ETSI EN 300 220-2 (Category 1) and EN 301 489-3
9pin 0.1" pitch molex (optionally 5 pin, without channel selects)
2pin 0.1" pitch molex
1.2mm (min.)
ETSI Radio standard EN 300 220-2 and EMC standard EN 301 489-3
-120dBm for 12 dB SINAD
>85dB
-62dB
Tested per. ETSI 300-220 v 2.3.1
>70dB
>65dB
Compliant with ETSI 300-220-2 (Category 1) and EN 301 489-3
RSSI, carrier detect, audio, data
28ms
50ms
Frequency stability
Channel spacing
Number of channels
Supply
voltage
Current
Operating temperature
Size
Spurious radiations
Interface
user
RF
Recommended PCB hole size
Intended approval
Receive
Sensitivity
blocking
adjacent channel
Image
spurii
Spurious radiations
Outputs
Power on to valid audio
Power on to stable data out
(50:50 mark / space)
Radiometrix Ltd, COR3 Data Sheet
page 5
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