S-57K1NBL1A-M3T2U Datasheet, PDF (10/15 Pages) Seiko Instruments Inc – HIGH-SPEED BIPOLAR HALL EFFECT LATCH

FOR AUTOMOTIVE 125°C OPERATION HIGH-WITHSTAND VOLTAGE HIGH-SPEED BIPOLAR HALL EFFECT LATCH
S-57K1 A Series
Rev.1.5_01
3. Basic operation
The S-57K1 A 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 operating 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-57K1 A Series, VOUT changes
from "H" to "L". When the N pole of a magnet is moved closer to the marking surface of the S-57K1 A 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.
V_OUT
B_HYS
H
N pole
B_RP
0
B_OP
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-57K1 A Series, VOUT changes from "L" to "H". When the
N pole of a magnet is moved closer to the marking surface of the S-57K1 A 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.
V_OUT
B_HYS
H
N pole
10
B_RP
0
B_OP
Magnetic flux density (B)
Figure 13
L
S pole