SS2712

Hall Latch - High Sensitivity

6

V3.10 Nov 1, 2013

The SOT-23 device is reversed from the UA package. The SOT-23 output transistor will be turned on(drops low) in the presence of a

sufficiently strong North pole magnetic field applied to the marked face and turned off(hoists high) in the presence of a sufficiently

strong South pole magnetic field.

Application Information

It is strongly recommended that an external bypass capacitor be connected (in close proximity to the Hall sensor)

ed by the chopper stabilization technique. As is shown in the following fi

gure, a 0.1μF capacitor is typical.

Typical Three-Wire Application Circuit

For reverse voltage protection, it is recommended to connect a resistor or a diode in series with the VDD pin.

When using a resistor, three points are important:

- the resistor has to limit the reverse current to 50mA maximum (VCC / R1 ≤ 50mA)

- the resulting device supply voltage VDD has to be higher than VDD min (VDD = VCC – R1*IDD)

2

/R1)

Using a diode, a reverse current cannot flow and the voltage drop is almost constant (

≈0.7V).

Therefore, a 100

Ω/0.25W resistor for 5V application and a diode for higher supply voltage are recommended.

Both solutions provide the required reverse voltage protection.

When a weak power supply is used or when the device is intended to be used in noisy environment, it is

recommended that the following figure is used.

The low-pass filter formed by R1 and C1 and the Zener diode Z1 bypass the disturbances or voltage spikes occur-

ring on the device supply voltage VDD. The diode D1 provides additional reverse voltage protection.

R2

C2

GND

OUT

C1

SS2712