S-5717ANDL8-I4T1U Datasheet, PDF (11/19 Pages) Seiko Instruments Inc – UNIPOLAR DETECTION TYPE HALL IC

LOW VOLTAGE OPERATION BOTH POLES / UNIPOLAR DETECTION TYPE HALL IC
Rev.1.0_01
S-5717 Series
3. Basic operation
The S-5717 Series changes the output voltage level (VOUT) 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 (BOPN or BOPS) after
the S pole or N pole of a magnet is moved closer to the marking surface of the S-5717 Series, VOUT changes from
"H" to "L". When the S pole or N pole of a magnet is moved further away from the marking surface of the S-5717
Series and the magnetic flux density is lower than the release point (BRPN or BRPS), VOUT changes from "L" to "H".
Figure 13 shows the relationship between the magnetic density and VOUT.
B_HYSN
V_OUT
B_HYSS
H
N pole
B_OPN B_RPN
0
B_RPS
Magnetic flux density (B)
B_OPS
Figure 13
L
S pole
3. 2 Product with S pole detection
When the magnetic flux density vertical to the marking surface exceeds BOPS after the S pole of a magnet is
moved closer to the marking surface of the S-5717 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-5717 Series and the magnetic flux density is
lower than BRPS, VOUT changes from "L" to "H".
Figure 14 shows the relationship between the magnetic density and VOUT.
V_OUT
B_HYSS
H
N pole
0
B_RPS
Magnetic flux density (B)
B_OPS
Figure 14
L
S pole
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