SS2509-R datasheet(5/8 Pages) SECELECTRONICS

5 / 8 page

SS2509-R

Hall Latch - High Sensitivity

V3.10

Dec 1, 2014

magnetic fields with equivalent strength and opposite direction drive the output high and low.

Powering-on the device in the hysteresis region (higher than BOP and less than BRP) allows an indeterminate output

state. The correct state is attained after the first excursion beyond BOP or BRP.

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

presence of a sufficiently strong South 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)

between the supply (VDD Pin) and ground (GND Pin) of the device to reduce both external noise and noise gener-

ated by the chopper stabilization technique. As is shown in the two figures in next page, a 0.1μF capacitor is typi-

cal.

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)

- 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. 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 that the second 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-

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

The SS2509-R have been optimized for commutation applications in 5V and 12V brushless DC motors. The fol-

low figure is the typical application circuit for 3 phase brushless DC motors.

SS2509-R

VDD

GND

OUT

SS2509-R

R1:100

VDD

GND

OUT

Automotive and Severe Environment Protec-

tion Circuit

Typical Three-Wire Application Circuit

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