KMT32B Magnetic Angle Sensor

Transcription

1 TDFN SO8 AMR Sensor with 80 period high accuracy high resolution for the use at moderate field strengths tiny TDFN package ROHS & REACH compliant DESCRIPTION The KMT3B 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>5 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( and the second following a sin( function, being the angle between sensor and field direction (see Figure. The KMT3B magnetic field sensor is suited for high precision angle measurement applications at a regular field strength of H 0 5 ka/m (generated for example with magnet from Magnetfabrik Bonn at a distance of 5. mm at room temperature. With reduced accuracy, the sensor KMT3B may be used with a field strength of H 0 4 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 Absolute and incremental angle measurement environments Design optimized for linearity Automotive (steering angle, torque High accuracy Robotics Low cost, low power Camera positioning Self diagnosis feature Potentiometer replacement Attractive SMD packages Position measurement in medical applications User has complete control over signal Motor motion control evaluation Extended operating temperature range (-40 C to +50 C, +60 C on request REACH & RoHS compliant (lead free /6

2 CHARACTERISTIC VALUES Parameter Symbol Condition Min Typ Max Unit A. Operating Limits Max. supply voltage Vcc,max 0 V Max. current (single bridge Icc,max 4 ma Operating temperature T op C Storage temperature T st C B. Sensor Specifications (T=5 C Supply voltage Vcc 5 V Resistance (single bridge R b Output signal amplitude V PEAK Condition A, B 9 3 mv/v Offset voltage V OFF Condition A, B mv/v Angular inaccuracy Condition A, B deg Angular hysteresis H Condition A, B 0. deg C. Sensor Specifications TC of amplitude TCSV Condition A, C %/K TC of resistance TCBR Condition A, C %/K TC of offset TCVoff Condition A, C µv/v/k 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 T C T = 5 C (unless otherwise noted Supply voltage Vcc V Vcc = 5 V Applied magnetic field H ka/m H = 5 ka/m Condition B: Sensor Specifications (360 turn, Vo max>0, Vo min<0 Output signal amplitude V PEAK mv/v V PEAK = (Vo max - Vo min//vcc Offset voltage V OFF mv/v V OFF = (Vo max + Vo min/vcc Angular inaccuracy deg MAX 0- ; max. angular difference between actual field 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 hysteresis H deg H = left turn - right turn angular difference between left and right turn /6

3 ΔVn/Vcc [mv/v] KMT3B Magnetic Angle Sensor MEASUREMENT CONDITIONS Parameter Symbol Unit Condition Condition C: Sensor Specifications (-5 C, +5 C Ambient temperatures T C T = -5 C, T 0 = +5 C, T = +5 C TC of amplitude TCSV %/K TC of resistance TCBR %/K TC of offset TCVoff (µv/v/ K TCV ( T TCR ( T Vn Vn ( T ( T Vcc Vcc 00% T Vn ( T Vcc R( T R( T 00% T R( T Voff ( T Voff ( T TCVoff ( T T BLOCK DIAGRAM Figure : Circuit Diagram TYPICAL PERFORMANCE CURVES direction of magnetic field KMT 3B X -0 Y -5 α [deg] V (cos V (sin Figure : Characteristic curves for KMT3B (SO8, TDFN 3/6

4 PACKAGES SO8 TDFN.5*.5 unit: mm RECOMMENDED SOLDER PAD LAYOUT FOR TDFN 4/6

5 PIN ASSIGNMENT (SO8, TDFN Pin (SO8 Pin (TDFN Symbol Function 7 -V o negative output bridge 8 -V o negative output bridge 3 V cc positive supply voltage bridge 4 V cc positive supply voltage bridge 5 3 +V o positive output bridge 6 4 +V o positive output bridge 7 5 GND negative supply voltage bridge 8 6 GND negative supply voltage bridge SOLDER PROFILE Recommended solder reflow process according to IPC/JEDEC J-STD-00D (Pb-Free Process TAPE AND REEL PACKAGING INFORMATION Description Reel size Units/reel Pin orientation Note KMT3B/TD 7 3,000 Top-right of sprocket hole side KMT3B/SO 3,500 Top-left of sprocket hole side 5/6

6 ORDERING CODE Device Package MOQ Part Number KMT 3B/SO SO-8 reel G-MRCO-05 KMT 3B/TD TDFN.5 x.5 reel G-MRCO-06 ORDERING INFORMATION NORTH AMERICA EUROPE ASIA Measurement Specialties, Inc. 000 Lucas Way Hampton, VA 3666 United States Phone: Fax: Web: MEAS Deutschland GmbH Hauert 3 D-447 Dortmund Germany Phone: +49-( Fax: +49-( info.de@meas-spec.com Web: Measurement Specialties China Ltd. No. 6, Langshan Road High-tech Park (North Nanshan District, Shenzhen China Phone: Fax: info.cn@meas-spec.com Web: 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.. 6/6