KMT32B Magnetic Angle Sensor
TDFN SO8 SM8
AMR Sensor with 180 Period
Moderate Field Strength
High Accuracy
TDFN Package
Various Packages Available
DESCRIPTION
The KMT32B is a magnetic field sensor based on the anisotropic magnetoresistance 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 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
Contactless Angular Position Absolute and Incremental Angle
SMD Package Angle Measurement
Design Optimized Linearity Motor Motion Control
Low Cost Robotics
High Accuracy Camera Positioning
High Rotational Speed up to 30,000 rpm Potentiometer Replacement
Extended Operating Temperature Range Automotive
(-40 C to +150 C, +160C on request)
Low Power
RoHS Compliant (lead free)
Ideal for Harsh Environments due to Magnetic
Sensing
KMT32B Angle Sensor Rev 1 www.meas-spec.com 09/11/2008
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KMT32B Magnetic Angle Sensor
CHARACTERISTIC VALUES
Parameter Symbol Condition Min Typ Max Unit
A. Operating Limits
max. supply voltage Vcc 10 V
,max
max. current (single Icc 4 mA
,max
bridge)
operating temperature T -40 +150
op C
storage temperature T -40 +150
st C
B. Sensor Specifications (T=25 C)
Supply voltage Vcc 5 V
Resistance (single bridge) R 2400 3000 3600
b
Output signal range Condition A, B 16 20 mV/V
V /Vcc
n
Offset voltage Voff/Vcc Condition A, B -1 0 +1 mV/V
angular inaccuracy Condition A, B 0.05 0.2 deg
angular hysteresis H Condition A, B 0.1 deg
C. Sensor Specifications
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
TC of offset TCVoff Condition A, C -4 0 +4 V/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
A. Set Up Conditions
ambient temperature T C
T = 235 C (unless otherwise noted)
supply voltage Vcc V Vcc = 5 V
applied magnetic field H kA/m H = 25 kA/m
B. Sensor Specifications (T=25 C, 360 turn , H=25 kA/m , Vo >0, Vo <0)
max min
Output signal range mV/V
V /Vcc V /Vcc = (Vo - Vo )/Vcc
n max min
n
Offset voltage Voff/Vcc mV/V Voff = (Vo + Vo )/Vcc
max min
angular inaccuracy deg
= MAX| -|
0
max. angular difference between actual value and
0
measured angle; offset voltage error contributions not included
angular hysteresis deg
H H = MAX| - |
left turn right turn
max. angular difference between left and right turn
KMT32B Angle Sensor Rev 1 www.meas-spec.com 09/11/2008
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