KMY 24 Microwave Motion Sensor Description The KMY 24 is a microwave rader motion sensor based on the Doppler effect. It transmits a low energy microwave radiation at 2.45 GHz which is reflected by objects. If the object is moving relative to the sensor, a Doppler shift occurs. The shifted wave is mixed with the original wave in two mixers, resulting in two output voltage signals. The phase shift between these two signals is negative or positive depending on whether the target is approaching or receding from the detector. Features • • • • • • • • High sensitivity Dual Mixers enabling direction detecting High reliability Low power consumption Low harmonic emission Small size Light weight Low cost Typ Marking Ordering Code Operating Frequency License No. KMY 24 KMY 24 Q62702-R323 BZT G127520H 2.45 GHz Pin Configuration 1 − VS (GND) 2 VD1 (output voltage D1) VD2 (output voltage D2) + VS 3 4 SIEMENS KMY 24 Notes: 1 2 3 4 1. Solder pads must not be perforated, as this will damage, EHA07260 and may destroy the multilayer PC Board. 2. Regulations on the use of High frequency devices. The use of high frequency devices is regulated in most countries and certain frequencies can be subject to restrictions. The use of the KMY 24 should be clarified with the respective authorities in each country to ensure compliance with the prevalent legislation. Data Sheet 1 1999-04-01 KMY 24 Absolute Maximum Ratings Parameter Symbol Limit Values Unit Operating temperature range Top − 20 … + 60 °C Storage temperature range Tstg − 30 … + 80 °C Supply voltage VS 15.6 V Electrical Characteristics at TA = 25 °C Parameter Symbol Limit Values Unit min. typ. max. 10.8 12 15.6 V 2.40 2.45 2.48 GHz − 23 − mA − 5…8 − m − 1) − mV Quotient of amplitude of 1 and 2 VS fo Iop rop VD1 VD1/VD2 − 2 − Phase difference ϕ 2 − ϕ1 − 40 … 120 − Equivalent isotropic radiated power at fo EIRP − 8 Supply voltage Operating frequency Operating current Detecting range1) Amplitude of signal 1 − Degrees dBm 1) The amplitude of the signal depends on the object size and its distance from the detector. Measurements taken with 5 cm high, cylindrical metallic objects, moving in circles at a distance of 1 m for example, give signal amplitudes of typically VD1 = 40 mV. Data Sheet 2 1999-04-01 KMY 24 Output Signal The phase difference between VD2 and VD1 is positive, if the target is receding from the detector. ( ϕ1 – ϕ2 ) ≥ 0 EHA07261 VD1 Receding VD2 Ch1 10 mV Ch2 10 mV M 100 ms The phase difference between VD2 and VD1 is negative, if the target is approaching the detector. ( ϕ1 – ϕ2 ) ≥ 0 EHA07262 VD1 Approaching Ch1 10 mV Data Sheet Ch2 10 mV 3 VD2 M 100 ms 1999-04-01 KMY 24 Typical Radiation Pattern The diagram shows the typical radiation pattern in the x-z- and y-z-planes. The z-direction is perpendicular to the patch antenna, x shows the longer and y the shorter side of the rectangular antenna. 0 0 dB 30 -10 dB 60 -20 dB 90 EHA07263 Package Outline Special Package 5.5 19.9 38 3 ø3.2 26 Marking 3 0.8 5 2.5 15.2 EHA07466 Sorts of Packing Package outlines for tubes, trays etc. are contained in our Data Book “Package Information”. Data Sheet 4 Dimensions in mm 1999-04-01