SS2712

Hall Latch - High Sensitivity

3

V3.10 Nov 1, 2013

Pin Definitions and Description

SOT Pin

№ SIP Pin №

Name

Type

Function

1

1

Supply

Supply Voltage pin

2

3

OUT

Output

Open Drain Output pin

3

2

GND

Ground

Ground pin

Detailed General Description

The SS2712 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 ex-

is, a south pole of sufficient strength towards the branded surface of the device turns the device on. The device re-

mains 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 differ-

vents 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.

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

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

0mT

0mT

Output level

Output level

OUT = High

Flux density

OUT = High

30Gs typ

OUT = Low

OUT = Low

UA package

- Latch characteristic

30Gs typ

-30Gs typ

-30Gs typ

Flux density

SO

package

- Latch characteristic