ZMT31 ANGLE SENSOR DESCRIPTION The ZMT31 allows the contactless counting of thr revolutions of a rotating magnet which is mounted on the axis of a wheel. Zero output voltages of the Wheatstones bridges are used as trigger signals. The sense of rotation of the wheel is taken into account by comparing the signal outputs of both Wheatstone bridges which are proportional to sin2(␣) or sin2(␣+45⬚). the angle can be determined by evaluating these signals. Alternatively it is possible to use the voltage signals of four half bridges which are trimmed on Vb/2. FEATURES · Measures the magnetic field hrot (> 50kA/m) generated by a permanent magnet which rotates over the sensor · Magnetic field hrot parallel to the chip surface causes a sinusoidal output signal PINOUT DIAGRAM · Package : SM-8 (available on 12mm tape) 1 8 · Contactless counting of the revolutions of a rotating magnet (watermeters etc.) 2 7 · Contactless angular measurement 3 6 · Automotive (pedal position etc.) 4 5 APPLICATION · Contactless rotary switches Pin connection: · Contactless potentiometer Bridge1: pin 1: -VO pin 5: +VO pin 8: -VB (GND) pin 4: +VB Bridge 2: pin 2: -VO pin 6: +VO pin 7: -VB (GND) pin 3: +VB ORDERING INFORMATION DEVICE REEL SIZE TAPE WIDTH QUANTITY PER REEL ZMT31TA 7 12mm 1000 ZMT31TC 13 12mm 4000 VO - output voltage VB - supply voltage DE VICE MARKING · ZMT31 ISSUE 2 - FEBRUARY 2002 1 ZMT31 PARAMETER SYMBOL LIMIT Supply Voltage VB 5 Total power dissipation Ptot 120 Tamb -25 to +100 ⬚C Storage temperature range Tstg -40 to +125 ⬚C Sensor chip alignment error ␣e ⱕ2 Operating tempersture range PARAMETER SYMBOL MIN. TYP. 3.0 Bridge resistance R br 2.0 Offset voltage V Off / V B -2.0 Sensitivety S␣ 0.2 Half bridge symmetry (V S /2-V O )/V B -2.0 Output voltage range (|Vmax|+|Vmin|) /V B ⌬␣ MAX. UNIT V mW ⬚ UNIT TEST CONDITIONS 4.0 k⍀ +2.0 mV/V bridge 1: ␣=45⬚; (mV/V)/⬚ bridge 1: ␣=0⬚; bridge 2: ␣=0⬚ bridge 2: ␣=45⬚ +2.0 mV/V bridge 1: ␣=0⬚; bridge 2: ␣=45⬚ Zero offset angle hysteresis 16 mV/V 2 ⬚ Temperature coefficient of the bridge resistance -25⬚C <T amb <100⬚C T CBR 0.25 0.30 0.35 %/K Temperature coefficient of the open circuit sensitivity -25⬚C <T amb <100⬚C T CSV -0.35 -0.30 -0.25 %/K V B = const. T CSI -0.05 0 0.05 %/K I B = const Temperature coefficient of the offset voltage -25⬚C <T amb <100⬚C -3 T COFF +3 (V/V)/K ISSUE 2 - FEBRUARY 2002 2 ZMT31 Output Voltage of both Wheatstone bridges versus angle -0.5 ISSUE 2 - FEBRUARY 2002 3 of the magnetic fielddirection ZMT31 PACKAGE OUTLINE PACKAGE DIMENSIONS MILLIMETRES DIM MIN MAX A ᎏ 1.7 A1 0.02 0.1 b 0.7 TYP c 0.24 0.32 D 6.3 6.7 E 3.3 3.7 e1 4.59 TYP e2 1.53 TYP He 6.7 7.3 Lp 0.9 ᎏ ⍜ ᎏ 15⬚ 10⬚ TYP © Zetex plc 2001 Zetex plc Fields New Road Chadderton Oldham, OL9 8NP United Kingdom Telephone (44) 161 622 4422 Fax: (44) 161 622 4420 Zetex GmbH Streitfeldstraße 19 D-81673 München Zetex Inc 700 Veterans Memorial Hwy Hauppauge, NY11788 Germany Telefon: (49) 89 45 49 49 0 Fax: (49) 89 45 49 49 49 USA Telephone: (631) 360 2222 Fax: (631) 360 8222 Zetex (Asia) Ltd 3701-04 Metroplaza, Tower 1 Hing Fong Road Kwai Fong Hong Kong Telephone: (852) 26100 611 Fax: (852) 24250 494 These offices are supported by agents and distributors in major countries world-wide. This publication is issued to provide outline information only which (unless agreed by the Company in writing) may not be used, applied or reproduced for any purpose or form part of any order or contract or be regarded as a representation relating to the products or services concerned. The Company reserves the right to alter without notice the specification, design, price or conditions of supply of any product or service. For the latest product information, log on to www.zetex.com ISSUE 2 - FEBRUARY 2002 4 ZMT31 IG N O RE IS TH E G PA ISSUE 2 - FEBRUARY 2002 1