ZMT31 ANGLE SENSOR DESCRIPTION The ZMT31 allows the contactless counting of the 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 V b/2 . SM8 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 · Package : SM-8 (available on 12mm tape) APPLICATION 1 8 2 7 · Contactless counting of the revolutions of a rotating magnet (watermeters etc.) 3 6 · Contactless angular measurement 4 5 · Automotive (pedal position etc.) Bridge1: · Contactless rotary switches pin 8: -VB (GND) pin 4: +VB · Contactless potentiometer Bridge 2: pin 2: -VO pin 6: +VO pin 7: -VB (GND) pin 3: +VB ORDERING INFORMATION DEVICE pin 1: -VO pin 5: +VO REEL SIZE TAPE WIDTH QUANTITY PER REEL ZMT31TA 7 12mm 1000 ZMT31TC 13 12mm 4000 VO - output voltage VB - supply voltage DEVICE MARKING · ZMT31 ISSUE 4 - JUNE 2004 1 SEMICONDUCTORS ZMT31 PARAMETER SYMBOL LIMIT Supply voltage VB 5 Total power dissipation Ptot 120 Operating temperature range Tamb -25 to +130 Storage temperature range Tstg -40 to +130 Sensor chip alignment error ␣e ⱕ2 PARAMETER SYMBOL Bridge resistance UNIT V mW ⬚C ⬚C ⬚ MIN. TYP. MAX. UNIT TEST CONDITIONS R br 2.0 3.0 4.0 k⍀ Offset voltage V Off / V B -2.0 +2.0 mV/V bridge 1: ␣=45⬚; Sensitivity S␣ 0.2 (mV/V)/⬚ bridge 1: ␣=0⬚; bridge 2: ␣=0⬚ bridge 2: ␣=45⬚ Half bridge symmetry (V S /2-V O )/V B -2.0 +2.0 mV/V bridge 1: ␣=0⬚; bridge 2: ␣=45⬚ Output voltage range 16 (|Vmax|+|Vmin|) /V B mV/V Zero offset angle hysteresis ⌬␣ 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 4 - JUNE 2004 SEMICONDUCTORS 2 ZMT31 Output voltage of both Wheatstone bridges versus angle ␣ of the magnetic field direction ISSUE 4 - JUNE 2004 3 SEMICONDUCTORS ZMT31 PACKAGE OUTLINE Controlling dimensions are in millimeters. Approximate conversions are given in inches PACKAGE DIMENSIONS Millimeters Inches Millimeters DIM Inches DIM Min Max Typ. Min Max Typ. A - 1.7 - - 0.067 - A1 0.02 0.1 - 0.008 0.004 b - - 0.7 - - Min Max Typ. Min Max Typ. e1 - - 4.59 - - 0.1807 - e2 - - 1.53 - - 0.0602 0.0275 He 6.7 7.3 - 0.264 0.287 - c 0.24 0.32 - 0.009 0.013 - Lp 0.9 - - 0.035 - - D 6.3 6.7 - 0.248 0.264 - ␣ - 15° - - 15° - E 3.3 3.7 - 0.130 0.145 -  - - 10° - - 10° © Zetex Semiconductors plc 2004 Europe Americas Asia Pacific Corporate Headquarters Zetex GmbH Streitfeldstraße 19 D-81673 München Germany Zetex Inc 700 Veterans Memorial Hwy Hauppauge, NY 11788 USA Zetex (Asia) Ltd 3701-04 Metroplaza Tower 1 Hing Fong Road, Kwai Fong Hong Kong Zetex plc Lansdowne Road, Chadderton Oldham, OL9 9TY United Kingdom Telefon: (49) 89 45 49 49 0 Fax: (49) 89 45 49 49 49 [email protected] Telephone: (1) 631 360 2222 Fax: (1) 631 360 8222 [email protected] Telephone: (852) 26100 611 Fax: (852) 24250 494 [email protected] Telephone (44) 161 622 4444 Fax: (44) 161 622 4446 [email protected] 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 4 - JUNE 2004 SEMICONDUCTORS 4