S5718 datasheet(13/28 Pages) SII

13 / 28 page

LOWVOLTAGEOPERATIONOMNIPOLAR/UNIPOLARDETECTIONTYPEHALLEFFECTSWITCHICWITHSWITCHABLEDETECTIONPOLEFUNCTION

Rev.1.1_00

S-5718 Series

3. Basic operation

This IC changes the output voltage (VOUT) according to the level of the magnetic flux density (N pole or S pole) applied

by a magnet.

This IC can also switch the detection pole according to the SWP pin input voltage (VIN) status.

The following explains the operation for active "L" products.

3. 1 When VIN is medium level input voltage (VIM)

This IC performs omnipolar detection operation. Set the SWP pin to an open status or input VIM to the SWP pin.

If a capacitor with large capacitance is connected to the SWP pin when using the pin in the open status, steep

changes in power supply voltage at power-on and during power supply fluctuations may cause erroneous N pole

or S pole detection operation. For this reason, it is recommended that the SWP pin capacity be set to 100 pF or

lower including parasitic capacitance.

VOUT

S pole

BOPN

BRPN

BRPS

BOPS

N pole

Magnetic flux density (B)

BHYSS

BHYSN

"H"

"L"

Figure 16

3. 2 When VIN is low level input voltage (VIL)

This IC performs S pole detection operation. Connect the SWP pin to VSS pin with a resistor having 10 k

Ω or

lower, or input VIL to the SWP pin.

VOUT

S pole

BRPS

BOPS

N pole

Magnetic flux density (B)

BHYSS

"H"

"L"

Figure 17

3. 3 When VIN is high level input voltage (VIH)

This IC performs N pole detection operation. Connect the SWP pin to VDD pin with a resistor having 10 k

Ω or

lower, or input VIH to the SWP pin.

VOUT

S pole

BOPN

BRPN

N pole

Magnetic flux density (B)

BHYSN

"H"

"L"

Figure 18

S5718 Datasheet(PDF) 13 Page - Seiko Instruments Inc

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