SS2309

Hall Latch - High Sensitivity

5

V3.10 Nov 1, 2013

The SOT-23 device is reversed from the UA package. The SOT-23 output transistor will be latched on in the pres-

ence of a sufficiently strong North pole magnetic field applied to the marked face.

Application Information

It is strongly recommended that an external bypass capacitor be connected (in close proximity to the Hall sensor)

ated by the chopper stabilization technique. As is shown in the following two

figures, a 0.1μF capacitor is typical.

Typical Three-Wire Application Circuit

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:

≤ 50mA)

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 recom-

mended the following figure is used.

The low-pass filter formed by R1 and C1 and the Zener diode Z1 bypass the disturbances or voltage spikes occur-

Automotive and Severe Environment Protection Circuit

The SS2309 have been optimized for commutation applications in 5V and 12V brushless DC motors. The follow-

ing figure in the next page is the typical application circuit for 3 phase brushless DC motors.

SS2309

R2

C2

GND

OUT

C1

SS2309

R1:100

R2

C2

GND

OUT

C1

Z1

D1