RFA1 RFBEAM | Alldatasheet

Document overview

  • Manufacturer or author: Provided By ALLDATASHEET.COM(FREE DATASHEET DOWNLOAD SITE)
  • PDF pages: 7

Technical content

Features

  • Low Power Radar Movement Detector
  • Adjustable Sensitivity 1m to 10m for Persons
  • Adjustable Hold 1Second … 30 Minutes
  • Object Detection from 1cm/s … 80km/h
  • Selectable Continuous and Pulsed Mode
  • Power Supply 6V … 15VDC
  • 7mA Supply Current in Pulsed Mode
  • Fluorescent Lamp Interference Suppression Actual size

Applications

  • Energy Saving Applications
  • General Movement and Presence Detection
  • Surveillance Applications
  • Equipment Activation on Presence
  • Automatic Advertising Applications
  • Lighting Control

Description

RFA1 is a Radar based movement detector for objects moving up to 80km/h in continuous mode. It consists of a Radar sensor and a processing board. The output is an open collector driver with adjustable hold time from 1 to 30 minutes. Advanced pulsed technology allows low current operation at less than 10mA. Sensitivity is adjustable between 1m and 10m for persons. RFA1 is expandable by different I/O modules. Outline Dimensions Pin Configuration Pin arrangement: see left picture. Pin Description Typical Value

1 GND 0V, GND

2 VCC 6 … 24VDC

3 Output no detection: high impedance

detection: sink to ground: 1V @ 20mA Settings Hold time ranges from 1 second until 30 minutes. Time setting is progressive. Sensitivity sets the maximal distance range. Setting is approximately linear. Standard version ranges from 1m ..10m. © RFbeam Microwave GmbH www.rfbeam.ch Page 1/7 maxmin

RFA1 RADAR ACTIVATOR Datasheet Characteristics Parameter Conditions / Notes Symbol Min Typ Max Unit Operating conditions Supply voltage Vcc 6 24 VDC Supply current Pulsed mode (no detection) Icc 6.5 8 mA Pulsed mode (detection) Icc 10 12 mA Continuous mode Icc 35 45 mA Output Sink Current Vout < 1.5V Iout 20 mA Operating temperature Top -20 +80 °C Storage temperature Tst -20 +80 °C Settings Sensitivity continuous mode Persons, frontal, continuous mode RCap 1 10 m Sensitivity pulsed mode Sensitivity pulsed (energy saving) mode RCap2 1 7 m Hold Time TH 1s 30 min Pulse Mode can be enabled / disabled during power up tON / tOFF 5/200 µs Radar Capturing range Persons, frontal RCap 10 m Detectable object speed range v 0.1 80 km/h Output power EIRP PTX +12 +15 +17 dBm Spurious emission According to ETSI 300 440 Pspur -30 dBm Antenna Horizontal -3dB beamwidth E-Plane Wϕ 80 ° Vertical -3dB beamwidth H-Plane Wθ 34 ° Body Outline Dimensions length x width x height 45x45x15 mm3 Weight 13 g Connector ( Note 1) Terminal Block PTSM 0,5/ 3-2,5-H THR R32 3 pins Note 1) Phoenix terminal connector type PTSM 0,5/ 3-2,5-H THR R32: © RFbeam Microwave GmbH www.rfbeam.ch Page 2/7

RFA1 RADAR ACTIVATOR Datasheet Detection Field RFA1 can be mounted as shown on the left to get horizontally a “narrow field”. Rotating the module by 90° results in a wider field. Fig. 1 and Fig. 2 show typical detection fields for a walking person at different sensitivity settings. Please note: these values are typical and depend on many parameters. Please refer also to chapter Application Notes. Fig. 1 : Frontal response diagram Fig. 2: Frontal response, RFA1 turned by 90° Other characteristics are available for OEMs as options. Please contact info@RFbeam.ch. Connectors and Control Elements (1) Power and output connector (2) Hold time setting (3) Sensitivity setting (4) Detection indicator LED (5) Programming pads (6) Expansion pads Fig. 3: Control elements © RFbeam Microwave GmbH www.rfbeam.ch Page 3/7 2 3

RFA1 RADAR ACTIVATOR Datasheet Principle of Operation RFA1 is a movement sensor containig a Doppler Radar module K-LC1a. Signal acquisition, amplifier and digitizer are built in hardware, while timing and output are processed in a microcontroller. RFA1 can operate in two modes:

  • Continuous mode, where the Radar module is always powered.
  • In pulsed mode, the Radar module is powered during approx. 4us and switched off during 200us (i.e. duty cycle of around 2%). During the off time, signal is stored in a sample&hold (S&H) circuit. Signal output frequency of the Radar module is 44Hz/km/h or 158Hz/m/s. Radar output voltage depends on reflectivity, distance and direction of the moving object. It ranges from a few µV to some mV. This input signal is filtered and passes a band-stop at 100Hz. This reduces the influence of fluorescent lights in countries with a mains frequency if 50Hz. After a gain-adjustable amplifier, the amplified signal passes a window comparator. Comparator signal contains double frequency of the input signal and is read by a microcontroller. Microcontroller performs some digital filtering, timing and output control. Fig. 4: Block Diagram Application Notes Connection Diagrams Open collector output is universal and allows many different configurations. Fig. 5 shows two typical situations. Output and RFA1 operating voltage may also be connected to separate power supplies. Maximum output current should not exceed 20mA. Maximum supply current is 45mA (continuous mode) or 10mA (energy saving mode). © RFbeam Microwave GmbH www.rfbeam.ch Page 4/7 Controller DC DC S&H 1Hz ..4kHz A = 1000...10'000 100Hz T = 1s ...30min Radar 4us/200us 6V...24VDC NPN Output Ground Fig. 5: Examples: Left Relais, Right Controller 6 ... 24VDC Ground Output Supply RFA1 6 ... 24VDC Ground Output Supply RFA1 Controller 10k

RFA1 RADAR ACTIVATOR Datasheet Continuous and Energy Saving Mode Mode Selection RFA1 can operate in two modes:

  • Continuous mode: Radar module is always powered.
  • Energy Saving mode (also called pulsed mode): Radar module is powered during approx. 4us and switched off during 200us (i.e. duty cycle of around 2%). These modes can be selected once and remain stored until changed again. See settings instruction in Fig. 6 . Here are some major differences between the two modes: Continuous mode Energy Saving mode Comment Current consumption 35mA 6.5mA No detection 38mA 10mA During detection / Hold time Maximum sensitivity 10m 7m Walking person Max. detectable speed 80km/h 60km/h higher speeds decrease sensitivity Table 1: Typical characteristics of operation modes Setting will be toggled between the 2 modes. It remains permanantly stored in EEPROM. 1. Short circuit 2 pins with screw driver 2. Switch power on 3. LED blinks 1 x = continuous mode 3 x = energy saving pulsed mode Fig. 6: Setting the operation mode Installation Tips Radar for movement detection is a very reliable and robust technology. It is insensitive to heat, wind, dust, sunlight and other influences. However, there are some important issues to take into consideration:
  • Sensitivity to fluorescent light
  • Material and thickness of cover
  • Sensitivity to vibrations The following application notes should help to optimize your application. © RFbeam Microwave GmbH www.rfbeam.ch Page 5/7

RFA1 RADAR ACTIVATOR Datasheet Cover Every cover has some influence on the shape of detection field and the achievable maximum distance. Radar can „view“ through plastic and glass of any color. This makes a high degree of design freedom. Nevertheless, some rules should be considered.

  • Cover must not be metallic.
  • Plastic coating with colors NOT containing metallic or carbon particles.
  • Distance between cover and front of Radar sensor > 1cm
  • Best cover material is Polycarbonat or ABS
  • Best cover thickness is 3-4mm
  • Vibrations of RFA1 relatively to the cover should be avoided, because this generates signals that can trigger the output Interference Factors All these interferences can lead to false triggers of the output. Use RFA1 at the lowest possible sensitivity for your application. Fluorescence Light
  • Do not mount RFA1 directly facing to fluorescent lamps
  • Use RFA1 at the lowest possible sensitivity for your certain application Radar is susceptible to fluorescent lamps, even if controlled by electronic ballasts. These lamps produce a 100Hz (50Hz mains, Europe) or 120Hz (60Hz mains, USA) Radar signal that is similar to the signals produced by a person walking at about 2km/h. RFA1 is equipped with a 100Hz filter, that can absorb a certain amount of fluorescent light interference. However, 100% protection against fluorescent light susceptibility is technically not possible. Rain
  • Prevent cover to get wet
  • The lager the distance to rainy environment, the smaller the rain effect. Raindrops can be interpreted by Radar as moving objects and may trigger the output. Vibrations, Ventilators etc.
  • RFA1 and its cover should be mounted stable to prevent vibrations
  • Try to prevent objects like ventilators in the sight of RFA1 RFA1 Radar detects moving objects. Vibrations, ventilators, moving plants etc can also be interpreted as moving objects. Such objects can therefore trigger RFA1. © RFbeam Microwave GmbH www.rfbeam.ch Page 6/7

RFA1 RADAR ACTIVATOR Datasheet Sensitivity and Maximum Range Sensitivity defines the necessary signal strength at the Radar sensor to trigger the output. RFA1 allows adjusting sensitivity by a potentiometer. Trigger distance at same sensitivity setting can vary depending on

  • Type of moving object (person, car etc.).
  • Moving direction of the object or the angle of RFA1 to the moving direction respectively Frontal distance for detecting persons can be adjusted from approximately 1m to 10m. This corresponds to approximately 2m to 20m for cars. Expansions RFA1 can be expanded by RFbeam or OEMs according to their needs. Contact info@RFbeam for more informations on expanding RFA1. RFA1 can be mounted as “piggy back” on top of a mother board. Examples of possible RFA1 expansions:
  • Relais output
  • Mains power supply
  • Additional light sensor

Ordering Information

  • Standard version with K-LC1a module soldered Part# RFA1
  • Evaluation version with 5 pin sensor connector. Module not included. Part# RFA1_EVAL
  • OEM version with individual module soldered (K-LC3, K-LC5 …) Part# RFA1_OEM Datasheet Revision History V0.9 2011-09-27 Initial preliminary release V0.9a 2011-10-11 Typing and reference errors corrected V1.0 2013-01-17 Ordering information added © RFbeam Microwave GmbH www.rfbeam.ch Page 7/7 RFbeam does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and RFbeam reserves the right at any time without notice to change said circuitry and specifications.