KMT37 Magnetic Angle Sensor SPECIFICATIONS AMR Sensor with 180 period For the use at moderate field strengths High accuracy Reliable SO8-package Qualified for automotive applications The KMT37 is a magnetic field sensor based on the anisotropic magneto resistance effect, i.e. it is sensing the magnetic field direction independently on the magnetic field strength for applied field strengths H>=14 kA/m. The sensor contains two parallel supplied Wheatstone bridges, which enclose a sensitive angle of 45 degrees. A rotating magnetic field in the surface parallel to the chip (x-y plane) will deliver two independent sinusoidal output signals, one following a cos(2 ) and the second following a sin(2 ) function, being the angle between sensor and field direction (See Figure 2). FEATURES APPLICATIONS Absolute and incremental angle measurement Contactless angular position Design optimized linearity Motor motion control High accuracy Robotics Low cost, low power Camera positioning Self diagnosis feature Potentiometer replacement User has complete control over signal Position measurement in medical applications evaluation Automotive (steering angle, torque, etc.) Reliable SO8-Package High rotational speed possible Extended operating temperature range (-40 C to +150 C) Ideal for harsh environments due to magnetic sensing principle RoHS compliant (lead free) SENSOR SOLUTIONS ///KMT37 06/2017 Page 1 KMT37 Angular Sensor CHARACTERISTIC VALUES Parameter Condition Symbol Min Typ Max Unit Absolute maximum ratings Supply voltage V 10 V CC Operating temperature T -40 +150 C OP Storage temperature TST -50 +150 C Operating conditions 0 5 8.5 Supply voltage VCC V Applied magnetic field H 14 25 400 kA/m General parameters 2.4 3.0 3.6 Bridge resistance T = 25 C RB k 9 11 13 max. signal amplitude T = 25 C, H = 25 kA/m V/VCC mV/V Offset voltage 2) T = 25 C, H = 25 kA/m V /V -1 +1 mV/V OFF CC H = 14 kA/m 0.1 0.4 Hysteresis 1) Hyst deg (Repeatability) 0.05 0.1 H = 25 kA/m H = 14 kA/m 0.1 0.5 Accuracy 1) deg 0.05 0.15 H = 25 kA/m -0.35 TC of amplitude H = 25 kA/m, 3) TCSV %/K +0.35 TC of bridge resistance 3) TCBR %/K TC of offset voltage H = 25 kA/m, 1), 2) TC -4 0 +4 V/V/K Voff Amplitude synchronism H = 25 kA/m, 4) k 99.5 100 100.5 % Sensitivity H = 25 kA/m, 4), S1 or Vn/VCC mV/V x / 180 mV/V/deg S2 (zero crossing) 1 = 135, 2 = 0 Peak output voltage H = 25 kA/m, V = 5 V, 4) V n 45 55 65 mV/V CC po 1) Hysteresis and accuracy are depending nearly inversely proportional on the magnetic field strength. The accuracy is defined as the max. angular difference between actual field angle and measured angle calculated from the third and fifth harmonics of the Fourier spectrum. The hysteresis is defined as angular difference between left and right turn. 2) Offset voltages are calculated by measuring both output voltages at several field angles between 0 and 360, then drawing a diagram with the output voltages as axis and fitting a circle to the signal points. The Offsets are the coordinates of the circle center. 3) Reference temperature (Temp. with parameter value = 100%) Tref = -25 C, calculated from values at -25C and +125 C. 4) This parameter is given for reference only and is not measured on a regular basis. SENSOR SOLUTIONS ///KMT37 06/2017 Page 2