SS5682

Unipolar Hall Switch

5

V2.00 May 1, 2012

Output Behaviour versus Magnetic Pole

DC Operating Parameters TA = -40 C to 150 C, VDD = 2.5V to 24V (unless otherwise specified)

Parameter

Test Conditions

Out

North pole (TO)

Low

South pole (SOT)

Low

Null or weak magnetic field

B= 0 or B < BRP

High

Table : Output behaviour versus magnetic pole

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:

- 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)

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

Automotive and Severe

Environment Protection Circuit

Typical Three-Wire Application Circuit

SS5682

R2

C2

VDD

GND

OUT

C1

SS5682

R1:100

VDD

R2

C1

D1

OUT

Z1

C2

GND