WSH237

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© Winson, 2020/1/17

Page 8

Application Circuit and Note

《Magnetic Switch - Direct Setting Method》

Step 1

Supply voltage Vdd.

Step 2

Vset pin and Vout pin are short-circuited, and provide magnetic field to IC.

Step 3

Measure the output voltage directly by a multimeter under DC mode and

records this voltage.

Step 4

Vset pin and Vout pin are open-circuited, and input the measured voltage

value mentioned above into Vset pin. Here, VB is an internal Hall sensing

voltage signal which is proportional to magnetic field.

Step 5

The output voltage levels will change according to:

Output "High" when VB > Vset

Output "Low" when VB < Vset

《Magnetic Switch - Formula Solution Method》

Step 1

Supply voltage Vdd. For example, Vdd = 5V.

Step 2

Vset pin and Vout pin are short-circuited, and measure output voltage

without magnetic field. For example, V0G ≒ 2.5V under Vdd = 5V.

Step 3

Getting Vset value by calculation:

Vset = (magnetic field) × (sensitivity) + V0G

For example, intend to set magnetic sensing value at 250G. Here, and the

sensitivity is around 4 mV/G under Vdd = 5V.

Vset = 250 × 4 × 10

-3 + 2.5 = 3.5 (V)

Step 4

Vset pin and Vout pin are open-circuited, and input the calculated voltage

value mentioned above into Vset pin.

Step 5

The output voltage levels will change according to:

Output "High" when VB > Vset

Output "Low" when VB < Vset