SS109

Unipolar Hall Switch

 

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 generated

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:

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 recommended

that the 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 occurring

Automotive and Severe

Environment Protection Circuit

Typical Three-Wire Application Circuit

4

V2.10

May 1, 2012

 

ESD Precautions

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

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

SS109

R2

C2

VDD

GND

OUT

C1

SS109

R1:100

R2

C2

VDD

C1

D1

OUT

Z1

GND