SS1331
Unipolar Hall Switch-Low Sensitivity
Application Information
For proper operation, a 100nF bypass capacitor should be placed as close as possible to the device between the
DD and ground pin.
V
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 = VCC2/ R1)
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.
Typical Three-Wire Application Circuit
When a weak power supply is used or when the device is intended to be used in noisy environment, it is recom-
mended that figure followed 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.
Both solutions provide the required reverse voltage protection.
Automotive and Harsh, Noisy Environments Three-Wire Circuit
ESD Precautions
Electronic semiconductor products are sensitive to Electro Static Discharge (ESD).
Always observe Electro Static Discharge control procedures whenever handling semiconductor products.
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V3.10 Nov 1, 2013
SECELECTRONICS [ SEC Electronics Inc. ]
