KMZ43T Datasheet, PDF (1/8 Pages) NXP Semiconductors – Magnetic field sensor

KMZ43T
Magnetic field sensor
Rev. 05 — 4 March 2009
Product data sheet
1. Product profile
1.1 General description
The KMZ43T is a sensitive magnetic field sensor, employing the magnetoresistive effect
of thin-film permalloy. The sensor contains two galvanic separated Wheatstone bridges, at
a relative angle of 45° to one another.
A rotating magnetic field in the x-y plane will produce two independent sinusoidal output
signals, one a function of +cos(2α) and the second a function of +sin(2α), α being the
angle between sensor and field direction (see Figure 2). The KMZ43T is suited to high
precision angle measurement applications under low field conditions (saturation field
strength 25 kA/m).
The sensor can be operated at any frequency between 0 Hz and 1 MHz.
1.2 Features
I Accurate and reliable angle measurement
I Mechanical robustness, contactless principle
I Wear-free operation
I Accuracy independent of mechanical tolerances
I Extended temperature range
1.3 Applications
I Steering angle and torsion
I Headlight adjustment
I Motor positioning
I Window wipers
I Fuel level
I Mirror positioning
1.4 Quick reference data
Table 1. Quick reference data
T_amb = 25 °C and H_ext = 25 kA/m; V_CC = 5 V; unless otherwise specified.
Symbol Parameter
Conditions
Min Typ
V_CC
V_peak
supply voltage
peak output voltage see Figure 2
[1] _-
5
[1] ₆₀
67
V_offset
offset voltage
per supply voltage;
[1] _−2
-
see Figure 2
R_bridge
bridge resistance
[1][2] _2.7
3.2
Max
9
75
+2
3.7
[1] Applicable for bridge 1 and bridge 2.
[2] Bridge resistance between pin 4 to pin 8, pin 3 to pin 7, pin 1 to pin 5 and pin 2 to pin 6.
Unit
V
mV
mV/V
kΩ