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SS1350EUA Scheda tecnica(PDF) 4 Page - SEC Electronics Inc. |
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SS1350EUA Scheda tecnica(HTML) 4 Page - SEC Electronics Inc. |
4 / 6 page SS1350 Unipolar Hall Switch-Low Sensitivity 4 V310 Nov 1, 2013 Application Information Typical Three-Wire Application Circuit Automotive and Harsh, Noisy Environments Three-Wire Circuit Application Comments For proper operation, a 100nF bypass capacitor should be placed as close as possible to the device between the VDD and ground pin. 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. When a weak power supply is used or when the device is intended to be used in noisy environment, it is recommended the second figure above is used. The low-pass filter formed by R1 and C1 and the Zener diode Z1 bypass the disturbances or voltage spikes occurring on the device supply voltage VDD. The diode D1 provides additional reverse voltage protection. Both solutions provide the required reverse voltage protection. |
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