KMT32B Magnetic Angle Sensor TDFN SO8 AMR Sensor with 180° period high accuracy high resolution for the use at moderate field strengths tiny TDFN package ROHS & REACH compliant DESCRIPTION The KMT32B 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>25 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 therefore 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). The KMT32B magnetic field sensor is suited for high precision angle measurement applications at a regular field strength of H0 ≥ 25 kA/m (generated for example with magnet 67.044 from Magnetfabrik Bonn at a distance of 5.2 mm at room temperature). With reduced accuracy, the sensor KMT32B may be used with a field strength of H0 ≥ 14 kA/m (at room temperature; be aware of the influence of the earth magnetic field!). Most magnets show a decreasing field strength with temperature while the magnetic field direction is unchanged. FEATURES APPLICATIONS Contactless angular position, ideal for harsh environments Design optimized for linearity High accuracy Low cost, low power Self diagnosis feature Attractive SMD packages User has complete control over signal evaluation Extended operating temperature range (-40 °C to +150 °C, +160°C on request) REACH & RoHS compliant (lead free) KMT32B Rev 6 Absolute and incremental angle measurement Automotive (steering angle, torque) Robotics Camera positioning Potentiometer replacement Position measurement in medical applications Motor motion control www.meas-spec.com 1/6 2013-July KMT32B Magnetic Angle Sensor CHARACTERISTIC VALUES Parameter Symbol Condition Min Typ Max Unit A. Operating Limits Max. supply voltage Vcc,max 10 V Max. current (single bridge) Icc,max 4 mA Operating temperature Top -40 +150 C Storage temperature Tst -40 +150 C B. Sensor Specifications (T=25 °C) Supply voltage 5 Vcc V Output signal amplitude VPEAK Condition A, B 9 11 13 mV/V Offset voltage -1 0 +1 mV/V 0.05 0.2 deg 0.1 deg Resistance (single bridge) Rb 2400 3000 3600 VOFF Condition A, B Angular inaccuracy Condition A, B Angular hysteresis H Condition A, B TC of amplitude TCSV Condition A, C -0.36 -0.32 -0.28 %/K TC of resistance TCBR Condition A, C +0.27 +0.32 +0.37 %/K TCVoff Condition A, C -4 0 +4 µV/V/K C. Sensor Specifications TC of offset Stress above one or more of the limiting values may cause permanent damage to the device. Exposure to limiting values for extended periods may affect device reliability. MEASUREMENT CONDITIONS Parameter Symbol Unit Condition Condition A: Set Up Conditions Ambient temperature Supply voltage Applied magnetic field T °C T = 25 °C (unless otherwise noted) Vcc V Vcc = 5 V H kA/m H = 25 kA/m Condition B: Sensor Specifications (360° turn , Vomax>0, Vomin<0) Output signal amplitude VPEAK mV/V VPEAK = (Vomax - Vomin)/2/Vcc Offset voltage VOFF mV/V VOFF = (Vomax + Vomin)/Vcc deg MAX|0-|; max. angular difference between actual field H deg H = |left turn -right turn| Angular inaccuracy Angular hysteresis angle 0 and measured angle due to deviations from ideal sinusoidal characteristics, calculated from the third and fifth harmonics of the Fourier spectrum; offset voltage error contributions not included angular difference between left and right turn KMT32B Rev 6 www.meas-spec.com 2/6 2013-July KMT32B Magnetic Angle Sensor MEASUREMENT CONDITIONS Parameter Symbol Unit Condition Condition C: Sensor Specifications (-25°C, +125°C) Ambient temperatures T1 = -25 °C, TC of amplitude T TCSV °C %/K TC of resistance TCBR %/K TC of offset TCVoff (µV/V)/ K T0 = +25 °C, T2 = +125 °C Vn Vn (T2 ) (T1 ) 1 Vcc TCV Vcc 100% Vn (T2 T1 ) (T1 ) Vcc TCR R(T2 ) R(T1 ) 1 100% (T2 T1 ) R(T1 ) TCVoff Voff (T2 ) Voff (T1 ) (T2 T1 ) BLOCK DIAGRAM Figure 1: Circuit Diagram TYPICAL PERFORMANCE CURVES 15 direction of magnetic field 10 ΔVn/Vcc [mV/V] 5 0 0 45 90 135 180 225 270 315 360 -5 KMT 32B X Y -10 -15 α [deg] V1 (cos) V2 (sin) Figure 2: Characteristic curves for KMT32B (SO8, TDFN) KMT32B Rev 6 www.meas-spec.com 3/6 2013-July KMT32B Magnetic Angle Sensor PACKAGES SO8 TDFN 2.5*2.5 unit: mm RECOMMENDED SOLDER PAD LAYOUT FOR TDFN KMT32B Rev 6 www.meas-spec.com 4/6 2013-July KMT32B Magnetic Angle Sensor PIN ASSIGNMENT (SO8, TDFN) Pin (SO8) 1 2 3 4 5 6 7 8 Pin (TDFN) 7 8 1 2 3 4 5 6 Symbol -Vo1 -Vo2 Vcc2 Vcc1 +Vo1 +Vo2 GND2 GND1 Function negative output bridge 1 negative output bridge 2 positive supply voltage bridge 2 positive supply voltage bridge 1 positive output bridge 1 positive output bridge 2 negative supply voltage bridge 2 negative supply voltage bridge 1 SOLDER PROFILE Recommended solder reflow process according to IPC/JEDEC J-STD-020D (Pb-Free Process) TAPE AND REEL PACKAGING INFORMATION Description Reel size Units/reel KMT32B/TD 7” 3,000 Top-right of sprocket hole side KMT32B/SO 13” 2,500 Top-left of sprocket hole side KMT32B Rev 6 Pin 1 orientation www.meas-spec.com 5/6 Note 2013-July KMT32B Magnetic Angle Sensor ORDERING CODE Device Package MOQ Part Number KMT 32B/SO SO-8 1 reel G-MRCO-015 KMT 32B/TD TDFN 2.5 x 2.5 1 reel G-MRCO-016 ORDERING INFORMATION NORTH AMERICA EUROPE ASIA Measurement Specialties, Inc. 1000 Lucas Way Hampton, VA 23666 United States Phone: +1-800-745-8008 Fax: +1-757-766-4297 Email: [email protected] Web: www.meas-spec.com MEAS Deutschland GmbH Hauert 13 D-44227 Dortmund Germany Phone: +49-(0)231-9740-0 Fax: +49-(0)231-9740-20 Email: [email protected] Web: www.meas-spec.com Measurement Specialties China Ltd. No. 26, Langshan Road High-tech Park (North) Nanshan District, Shenzhen 518057 China Phone: +86-755-33305088 Fax: +86-755-33305099 Email: [email protected] Web: www.meas-spec.com The information in this sheet has been carefully reviewed and is believed to be accurate; however, no responsibility is assumed for inaccuracies. Furthermore, this information does not convey to the purchaser of such devices any license under the patent rights to the manufacturer. Measurement Specialties, Inc. reserves the right to make changes without further notice to any product herein. Measurement Specialties, Inc. makes no warranty, representation or guarantee regarding the suitability of its product for any particular purpose, nor does Measurement Specialties, Inc. assume any liability arising out of the application or use of any product or circuit and specifically disclaims any and all liability, including without limitation consequential or incidental damages. Typical parameters can and do vary in different applications. All operating parameters must be validated for each customer application by customer’s technical experts. Measurement Specialties, Inc. does not convey any license under its patent rights nor the rights of others. . KMT32B Rev 6 www.meas-spec.com 6/6 2013-July