KRX2

EW N Hartcran House, 231 Kenton Lane, Harrow, HA3 8RP, England Issue 1, 29 May 2009 Tel: +44 (0) 20 8909 9595, Fax: +44 (0) 20 8909 2233 KRX2 UHF CodeUHF FM Code-Hopping Receiver Module Module KRX2 is a small PCB mounting UHF integrated receiver-decoder module that is ready-to-use with our UHF FM code-hopping transmitters for secure wireless remote control and keyless security systems. Features • • • • • • • • • • • • Figure 1: KRX2-433 Operates on 433.92MHz European licence exempt frequency All decoding and interfacing performed by the module Four outputs facilitate 15 different control codes for each transmitter Output interface to logic, microcontrollers or directly drive LEDs Learn input - remembers up to 16 different transmitters Remembers transmitters when power removed Output indication of Learn function Output indication of low supply voltage at a Transmitter Momentary (output follows input) or 10ms pulse output modes High performance receiver section may be used on its own DIL module form factor 5VDC supply Applications • • • • • • RF interface for Security and Alarm systems Status reporting and monitoring secure systems Industrial controls HVAC controls Door entry systems Simple On/Off switching Radiometrix Ltd KRX2 page 1 General Description KRX2 is a complete UHF FM receiver and rolling code decoder/interface in a compact form factor that may be placed directly into an end application with no special considerations. It is designed for use with our KTX2 module and KFX2 “Key-fob” products. In addition to its use as a ready-built code-hopping decoder, all the usual receiver connections are made available so that the receiver may be used for additional applications of the designer’s choosing. side view (through can) 6 mm side view (with can) 6 mm top view (without can) 1 RSSI RESERVED 2 0V 3 4 0V LRN (OUT) 5 6 RXD 7 AF 8 +5V 9 RF GND RF IN 10 40.62 mm 45 mm 20 19 18 17 16 15 14 13 12 11 S0 S1 S2 S3 LOW BATT RESERVED RESERVED RST LRN (IN) MODE 27 mm recommended PCB hole size: 1.2 mm module footprint size: 27 x 45 mm 2.54 mm pitch Figure 2: KRX2 Dimensions and pin-out 3 L 5V 8 Antenna 10 5 KRX2 Module 20 19 18 17 16 B 12 11 S0 S1 S2 S3 Learn button Mode switch Figure 3: example connection diagram Radiometrix Ltd KRX2 page 2 Pin description Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Name RSSI RESERVED 0V 0V LRN (OUT) RXD AF +5V RF GND RF IN MODE LRN (IN) /RST RESERVED RESERVED LOW BATT S3 S2 S1 S0 Function Analogue output of received signal strength indication with 60dB range. See page 5 for typical characteristics. Do not connect anything to this pin DC supply 0V. Internally connected to pins 4 & 9 and module screen. DC supply 0V. Internally connected to pins 3 & 9 and module screen. Digital indication of Learn function - see below for operational description. Digital output from the internal data slicer, i.e. a squared version of the signal on pin 7 (AF). It may be used to drive external decoders. Buffered and filtered analogue output from the FM demodulator. Standing DC bias 2V approx. External load should be >10kΩ //