S-57A1NSL1A-M3T2U Datasheet, PDF (10/15 Pages) Seiko Instruments Inc – HIGH-SPEED UNIPOLAR DETECTION TYPE HALL IC

FOR AUTOMOTIVE 125°C OPERATION HIGH-WITHSTAND VOLTAGE HIGH-SPEED UNIPOLAR DETECTION TYPE HALL IC
S-57A1 A Series
Rev.1.6_01
3. Basic operation
The S-57A1 A Series changes the output voltage (VOUT) according to the level of the magnetic flux density (N pole or
S pole) applied by a magnet.
Definition of the magnetic field is performed every operating cycle indicated in " Electrical Characteristics".
The following explains the operation when the magnetism detection logic is active "L".
3. 1 Product with S pole detection
When the magnetic flux density of the S pole perpendicular to the marking surface exceeds the operation point
(BOPS) after the S pole of a magnet is moved closer to the marking surface of the S-57A1 A Series, VOUT changes
from "H" to "L". When the S pole of a magnet is moved further away from the marking surface of the S-57A1 A
Series and the magnetic flux density is lower than the release point (BRPS), VOUT changes from "L" to "H".
Figure 12 shows the relationship between the magnetic flux density and VOUT.
V_OUT
B_HYSS
H
N pole
0
B_RPS
Magnetic flux density (B)
B_OPS
L
S pole
Figure 12
3. 2 Product with N pole detection
When the magnetic flux density of the N pole perpendicular to the marking surface exceeds the operation point
(BOPN) after the N pole of a magnet is moved closer to the marking surface of the S-57A1 A Series, VOUT changes
from "H" to "L". When the N pole of a magnet is moved further away from the marking surface of the S-57A1 A
Series and the magnetic flux density of the N pole is lower than the release point (BRPN), VOUT changes from "L" to
"H".
Figure 13 shows the relationship between the magnetic flux density and VOUT.
B_HYSN
V_OUT
H
N pole
B_OPN
L
S pole
B_RPN
0
Magnetic flux density (B)
Figure 13
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