ZMT31TA

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