SS559LSOT datasheet(4/8 Pages) SECELECTRONICS

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SS559

Hall Latch - High Sensitivity

Magnetic Specifications

DC Operating Parameters VDD = 2.5V to 24V (unless otherwise specified)

SS559

Parameter

Symbol

Test Conditions

Min

Typ

Max

Units

Operating Point

BOP

Release Point

BRP

-45

-30

-15

Hysteresis

BHYST

E spec., TA = 85°C

Operating Point

BOP

Release Point

BRP

-50

-30

-15

Hysteresis

BHYST

K spec., TA = 125°C

Operating Point

BOP

Release Point

BRP

-55

-30

-10

Hysteresis

BHYST

L spec., TA = 150°C

Table 4: Magnetic Specifications

Detailed General Description

The SS559 exhibits latch magnetic switching characteristics. Therefore, it requires both south and north poles to

operate properly.

The OUT pin of these devices switches low (turns on) when a magnetic field perpendicular to the Hall sensor exceeds

the operate point threshold, BOP. After turn-on, the output voltage is VDSon. Note that the device latches, that is, a south

pole of sufficient strength towards the branded surface of the device turns the device on. The device remains on if the

south pole is removed (B→0). This latching property defines the device as a magnetic memory.

When the magnetic field is reduced below the release point, BRP, the OUT pin turns off (goes high). The difference in

the magnetic operating and release points is the hysteresis, BHYST, of the device. This built-in hysteresis prevents

output oscillation near the switching point, and allows clean switching of the output even in the presence of external

mechanical vibration and electrical noise.

The device behaves as a latch with symmetric operating and release switching points (BOP=|BRP|). This means

magnetic fields with equivalent strength and opposite direction drive the output high and low.

Powering-on the device in the hysteresis region (less than BOP and higher than BRP) allows an indeterminate output

state. The correct state is attained after the first excursion beyond BOP or BRP.

The SOT-23 device is reversed from the UA package. The SOT-23 output transistor will be latched on in the presence

of a sufficiently strong North pole magnetic field applied to the marked face.

Output level

V2.10

May 1, 2012

0mT

OUT = High

Flux density

B OP

30Gs typ

OUT = Low

UA package - Latch characteristic

B OP

30Gs typ

B RP

-30Gs typ

B RP

-30Gs typ

Flux density

SE package - Latch characteristic

HYS

B HYS

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