ZMT32 Просмотр технического описания (PDF) - Diodes Incorporated.
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ZMT32 Datasheet PDF : 10 Pages
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Operating principle
ZMT32
H
0O
rot
1
GND1
8
GND2
7
+VO2
6
+VO1
5
α = 0°
␣
Bridge
1
Bridge
2
1
-VO1
2
-VO2
3
VCC2
4
VCC1
-V
1
O1
-VO2
Vcc2
Vcc1
GND1
GND2
+V
O2
+VO1
Characteristic output curves VO1, VO2
10
5
When a common-magnetic field is applied through the
ZMT32 the 2 internal magneto-resistive bridges are
affected slightly differently due to their 45° rotation to
one another. This 45° rotation enables the ZMT32 to
determine angular position, of a rotating magnetic
field.
When a rotating magnetic field is applied to the ZMT32
it will output 2 sinusoidal voltages that are:
• proportional to the field strength applied
• proportional to the supply voltage applied,
• rotating at twice the angular position
• 90° apart (as seen below).
By taking the arcTan of the ratio of VO2 to VO1 the
angular position of the magnetic field can be
determined.
Cos 2α
0
Sin 2α
-5
-10
Sensor bridge 2
Sensor bridge 1
-15
0
45
90
135
180
225
270
315
360
Issue 1 - June 2008
5
© Zetex Semiconductors plc 2008
www.zetex.com
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