SS559KSOT Просмотр технического описания (PDF) - SEC Electronics Inc.

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SS559KSOT

Hall Latch - High Sensitivity

SEC Electronics Inc. 

SS559

Hall Latch - High Sensitivity

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 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)

between the supply (VDD Pin) and ground (GND Pin) of the device to reduce both external noise and noise gener-

ated by the chopper stabilization technique. As is shown in the following first figure, 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 = VCC2/R1)

When using a diode, a reverse current cannot flow and the voltage drop is almost constant (≈0.7V).

Therefore, a 100Ω/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 recom-

mended the following second 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.

Typical Three-Wire Application Circuit

C1

VDD

R2

OUT

SS559

C2

GND

Automotive and Severe

EnvironmentProtection Circuit

R1:100

C1

VDD

R2

D1

Z1

SS559 OUT

C2

GND

5

V3.10 Nov 1, 2013

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