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SS732_1311 Fiches technique(PDF) 6 Page - SEC Electronics Inc.

No de pièce SS732_1311
Description  Hall Latch - High Sensitivity
Download  9 Pages
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Fabricant  SECELECTRONICS [SEC Electronics Inc.]
Site Internet  http://www.secsemi.com
Logo SECELECTRONICS - SEC Electronics Inc.

SS732_1311 Fiches technique(HTML) 6 Page - SEC Electronics Inc.

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SS732
Hall Latch - High Sensitivity
6
V3.10 Nov 1, 2013
The SOT-23 device is reversed from the UA package. The SOT-23 output transistor will be turned on(drops low) in the presence of a
sufficiently strong North pole magnetic field applied to the marked face and turned off(hoists high) in the presence of a sufficiently
strong South pole magnetic field.
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 generat-
ed by the chopper stabilization technique. As is shown in the following fi
gure, 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:
- 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)
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
recommended that 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-
ring on the device supply voltage VDD. The diode D1 provides additional reverse voltage protection.
R2
C2
VDD
GND
OUT
C1
SS732


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