Zetex ZMT31TA, ZMT31TC Datasheet
ANGLE SENSOR
DESCRIPTION
The ZMT31 allows the contactless counting of thr revolutions of a rotating magnet
which is mounted on the axis of a wheel. Zero output voltages of the Wheatstones
bridges are used as trigger signals. The sense ofrotation of the wheel is taken into
account by comparing the signal outputs of both Wheatstone bridges which are
proportional to sin2(␣) or sin2(␣+45⬚). the angle can be determined by evaluating
these signals. Alternatively it is possible to use the voltage signals of four half
bridges which are trimmed on V
FEATURES
Measures the magnetic field hrot (> 50kA/m)
·
generated by a permanent magnet which rotates
over the sensor
Magnetic field hrot paralleltothechipsurfacecauses
·
a sinusoidal output signal
· Package : SM-8 (available on 12mm tape)
b/2
.
PINOUT DIAGRAM
ZMT31
APPLICATION
· Contactless counting of the revolutions of a rotating
magnet (watermeters etc.)
·
Contactless angular measurement
·
Automotive (pedal position etc.)
·
Contactless rotary switches
·
Contactless potentiometer
ORDERING INFORMATION
DEVICE REEL
ZMT31TA
ZMT31TC
SIZE
7
13
TAPE
WIDTH
12mm 1000
12mm 4000
QUANTITY
PER REEL
DE VICE MARKING
·
ZMT31
ISSUE 2 - FEBRUARY 2002
1
2
3
4
Pin connection:
Bridge1: pin 1: -V
pin 8: -VB(GND) pin 4: +V
Bridge 2: pin 2: -VOpin 6: +V
pin 7: -VB(GND) pin 3: +V
VO- output voltage VB- supply voltage
O
8
7
6
5
pin 5: +V
O
O
B
B
1
ZMT31
PARAMETER SYMBOL LIMIT UNIT
Supply Voltage
Total power dissipation
Operating tempersture range
Storage temperature range
Sensor chip alignment error
P
T
T
V
B
tot
amb
stg
␣
e
5V
120 mW
-25 to +100 ⬚C
-40 to +125 ⬚C
ⱕ2 ⬚
PARAMETER SYMBOL MIN. TYP. MAX. UNIT TEST
Bridge resistance
Offset voltage
Sensitivety S
Half bridge symmetry
Output voltage range
Zero offset angle
hysteresis
Temperature coefficient of
the bridge resistance -25⬚C
<T
Temperature coefficient of
the open circuit sensitivity
-25⬚C<T
Temperature coefficient of
the offset voltage -25⬚C
<T
amb
amb
<100⬚C
amb
<100⬚C
<100⬚C
R
br
V
Off/VB
␣
/2-VO)/V
(V
S
(|Vmax|+|Vmin|) /V
⌬␣ 2 ⬚
T
CBR
T
CSV
T
CSI
T
COFF
B
2.0 3.0 4.0 k⍀
-2.0 +2.0 mV/V bridge 1: ␣=45⬚;
0.2 (mV/V)/⬚ bridge 1: ␣=0⬚;
-2.0 +2.0 mV/V bridge 1: ␣=0⬚;
16 mV/V
B
0.25 0.30 0.35 %/K
-0.35 -0.30 -0.25 %/K
-0.05 0 0.05 %/K
-3 +3 (V/V)/K
CONDITIONS
bridge 2: ␣=0⬚
bridge 2: ␣=45⬚
bridge 2: ␣=45⬚
V
B
I
= const
B
= const.
ISSUE 2 - FEBRUARY 2002
2
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