S-57B1 Datasheet, PDF (11/20 Pages) Seiko Instruments Inc – OPERATION HIGH-SPEED UNIPOLAR DETECTION TYPE HALL IC

125°C OPERATION HIGH-SPEED UNIPOLAR DETECTION TYPE HALL IC
Rev.3.0_00
S-57B1 Series
3. Basic operation
This IC changes the output voltage level (V_OUT) according to the level of the magnetic flux density (S pole) applied by
a magnet.
The following explains the operation when the magnetism detection logic is active "L".
When the magnetic flux density vertical to the marking surface exceeds the operation point (B_OPS) after the south pole
of a magnet is moved closer to the marking surface of this IC, V_OUT changes from "H" to "L". When the south pole of a
magnet is moved further away from the marking surface of this IC and the magnetic flux density is lower than the
release point (B_RPS), V_OUT changes from "L" to "H".
Figure 12 shows the relationship between the magnetic flux density and V_OUT.
V_OUT
BHYSS
H
N pole
0
B_RPS
Magnetic flux density (B)
B_OPS
Figure 12
L
S pole
11