SS2406 datasheet(5/8 Pages) SECELECTRONICS

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SS2406

Hall Latch - High Sensitivity

V3.10

Nov 1, 2013

netic 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 pres-

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

Application Information

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

tween the supply (VDD Pin) and ground (GND Pin) of the device to reduce both external noise and noise generated by

the chopper stabilization technique. As is shown in the following two

figures in next page, a 0.1μF capacitor is typical.

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)

- the resistor has to withstand the power dissipated in reverse voltage condition (PD = VCC

2/R1)

When 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

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 occurring

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

Typical Three-Wire Application Circuit

SS2406

VDD

GND

OUT

Automotive and Severe Environment Protection Circuit

SS2406

R1:100

VDD

GND

OUT

SS2406 Datasheet(PDF) 5 Page - SEC Electronics Inc.