S-5712ANDL0-M3T1U Datasheet, PDF (18/30 Pages) Seiko Instruments Inc – LOW VOLTAGE OPERATION

LOW VOLTAGE OPERATION BOTH POLES / UNIPOLAR DETECTION TYPE HALL IC
S-5712 Series
Rev.4.6_00
3. Basic operation
This IC changes the output voltage level (V_OUT) according to the level of the magnetic flux density (N pole or S pole)
applied by a magnet.
The following explains the operation when the magnetism detection logic is active "L".
3. 1 Product with both poles detection
When the magnetic flux density vertical to the marking surface exceeds the operation point (B_OPN or B_OPS) after
the S pole or N pole of a magnet is moved closer to the marking surface of this IC, V_OUT changes from "H" to "L".
When the S pole or N 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_RPN or B_RPS), V_OUT changes from "L" to "H".
Figure 15 shows the relationship between the magnetic flux density and V_OUT.
B_HYSN
V_OUT
B_HYSS
H
N pole
B_OPN
B_RPN
0
B_RPS
Magnetic flux density (B)
B_OPS
L
S pole
Figure 15
3. 2 Product with S pole detection
When the magnetic flux density vertical to the marking surface exceeds B_OPS after the S pole of a magnet is
moved closer to the marking surface of this IC, V_OUT changes from "H" to "L". When the S pole of a magnet is
moved further away from the marking surface of this IC and the magnetic flux density is lower than B_RPS, V_OUT
changes from "L" to "H".
Figure 16 shows the relationship between the magnetic flux density and V_OUT.
V_OUT
B_HYSS
H
N pole
0
B_RPS
Magnetic flux density (B)
B_OPS
Figure 16
L
S pole
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