S-57M1 Datasheet, PDF (10/16 Pages) Seiko Instruments Inc – HIGH-SPEED BIPOLAR HALL EFFECT LATCH

HIGH-SPEED BIPOLAR HALL EFFECT LATCH
S-57M1 Series
Rev.1.2_01
3. Basic operation
The S-57M1 Series changes the output voltage (VOUT) according to the level of the magnetic flux density and a
polarity change (N pole or S pole) applied by a magnet.
Definition of the magnetic field is performed every operation cycle indicated in " Electrical Characteristics".
3. 1 Product with VOUT = "L" at S pole detection
When the magnetic flux density of the S pole perpendicular to the marking surface exceeds the operation point
(BOP) after the S pole of a magnet is moved closer to the marking surface of the S-57M1 Series, VOUT changes
from "H" to "L". When the N pole of a magnet is moved closer to the marking surface of the S-57M1 Series and the
magnetic flux density of the N pole is higher than the release point (BRP), VOUT changes from "L" to "H". In case of
BRP < B < BOP, VOUT retains the status.
Figure 12 shows the relationship between the magnetic flux density and VOUT.
VOUT
BHYS
H
N pole
BRP
0
BOP
Magnetic Flux density (B)
L
S pole
Figure 12
3. 2 Product with VOUT = "H" at S pole detection
When the magnetic flux density of the S pole perpendicular to the marking surface exceeds BOP after the S pole of
a magnet is moved closer to the marking surface of the S-57M1 Series, VOUT changes from "L" to "H". When the N
pole of a magnet is moved closer to the marking surface of the S-57M1 Series and the magnetic flux density of the
N pole is higher than BRP, VOUT changes from "H" to "L". In case of BRP < B < BOP, VOUT retains the status.
Figure 13 shows the relationship between the magnetic flux density and VOUT.
VOUT
BHYS
H
N pole
10
BRP
0
BOP
Magnetic Flux density (B)
Figure 13
L
S pole