optek technology inc.? 1645 wallace drive, carrollton, texas 75006 phone: (800) 341-4747 fax: (972) 323? 2396 sensors@optekinc.com www.optekinc.com issue a 02/ 05 page 1 hallogic hall effect sensor assembly OHB900 features: ? non-contact motion sensing ? operates over a broad range of supply voltages ? excellent temper ature stability ? hall element, linear amplifier, and schmit t trigger on a single hallogic silicon chip ? performs in high dust and dirt env ironments over a wide temperature range ? 0.125? (3.18mm) wide gap description: the OHB900 consists of a hall effect sensor similar to the oh180u and a rare earth magnet mounted in a low cost plastic housing. the magnet produces optimum magnetic flux at the hall effect sensor location. the sensor has an open collector transist or output which is activated when the slot is open. when the slot is blocked by a ferrous material, reducing the magnetic fl ux density at the hall effect sensor location, the open collector output transistor switches off. the device provides up to 25 ma of sink current. output characteristics are constant at switching frequencies from dc to over 200 khz. the uni-polar turns on with a (logic level ?o?) with after a sufficient magnetic field from the south pole of a magnet approached the symbolized face of the device (ope rating point) and turns off (logic level ?1?) after the magnetic field reached a minimum value. this feature makes these sensors ideal for applications in non- contact switching operations. hall element voltage regulator 2 3 1vcc output ground magnet supply voltage, vcc 25 v storage temperature range, t s -50c to +160c operating temperature range, t a -50c to +150c lead soldering temperature (1/8 in. (3.2 mm) from case for 5 sec. with soldering iron) 260c output on current, i sink 25 ma output off voltage, v out 25 v magnetic flux density, b unlimited absolute maximum ratings (ta=25c unless otherwise noted)
optek technology inc.? 1645 wallace drive, carrollton, texas 75006 phone: (800) 341-4747 fax: (972) 323? 2396 sensors@optekinc.com www.optekinc.com issue a 02/ 05 page 2 hallogic hall effect sensor assembly OHB900 (1) slot blocked with a ferrous material to interrupt magnetic flux. symbol parameter min typ max units test conditions i cc supply current 4 7 ma vcc = 24 v, output off v ol output saturation voltage 100 400 mv vcc = 4.5 v, i ol = 20 ma, slot open i oh output leakage current 0.1 10.0 a vcc = 4.5 v, v out = 24 v, slot blocked (1) t r output rise time 0.21 1.00 s r l = 820 ? , c l = 20 pf t f output fall time 0.10 1.00 s electrical characteristics (vcc = 4.5 v to 24 v, t a = 25 c unless otherwise noted) u.u.t. 820 ohm 20 pf 3 2 1 vcc output ground v ol oh v 10% 90% tr tf 90% 10% b op rp b magnetic field saturation voltage vs temperature 0.10 0.15 0.20 0.25 0.30 0.35 0.40 -40c 0c 40c 80c 120c 150c temperature (c) typical saturation voltage (v) r l = 820 ohms rise & fall time vs temperature 0 50 100 150 200 250 300 350 -40c 0c 40c 80c 120c 150c temperature (c) typical time (ns) rise time fall time icc vs temperature 0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 -40c 0c 40c 80c 120c 150c temperature (c) typical icc (ma) icc on (ma) icc off (ma) m s center line rop vane - material = 1018 cold rolled steel - 0.03" [0.76mm] thick location = 0.50" [1.27mm] from bottom of slot right right left left operate release release operate point point point point minimum 0.073" 0.045" -0.045" -0.073" [1,85mm] [1,14mm] [-1,14mm] [-1,85mm] maximum 0.003" -0.005" 0.005" -0.003" [0,08mm] [-1,27mm] [1.27mm] [-0,08mm] rrp lop lrp measurements are referenced to center line.
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