SS1881LSOT datasheet(6/9 Pages) SECELECTRONICS

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SS1881

Hall Latch - High Sensitivity

V3.10

Nov 1, 2013

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 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 V

DD has to be higher than VDD min (VDD = VCC – R1*IDD)

- the resistor has to withstand the power dissipated in reverse voltage condition (P

D = VCC

/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 that figure 13.3 from the Application Information section 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 V

DD. The diode D1 provides additional reverse voltage protection.

VDD

GND

OUT

R1:100

VDD

GND

OUT

Automotive and Severe Environment

Protection Circuit

Typical Three-Wire Application Circuit

SS1881

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