SS1331 datasheet(5/7 Pages) SECELECTRONICS

5 / 7 page

SS1331

Unipolar Hall Switch-Low Sensitivity

V3.10

Nov 1, 2013

Application Information

For proper operation, a 100nF bypass capacitor should be placed as close as possible to the device between the

VDD and ground pin.

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

∙I

DD)

- 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.

Typical Three-Wire Application Circuit

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

mended that figure followed 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.

Both solutions provide the required reverse voltage protection.

Automotive and Harsh, Noisy Environments Three-Wire Circuit

ESD Precautions

Electronic semiconductor products are sensitive to Electro Static Discharge (ESD).

Always observe Electro Static Discharge control procedures whenever handling semiconductor products.

SS1331 Datasheet(PDF) 5 Page - SEC Electronics Inc.