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SS1881KSOT bảng dữ liệu(PDF) 6 Page - SEC Electronics Inc. |
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SS1881KSOT bảng dữ liệu(HTML) 6 Page - SEC Electronics Inc. |
6 / 9 page SS1881 Hall Latch - High Sensitivity 6 V3.10 Nov 1, 2013 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 typical. 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 V DD has to be higher than VDD min (VDD = VCC – R1*IDD) - the resistor has to withstand the power dissipated in reverse voltage condition (P D = 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 recommended that figure 13.3 from the Application Information section 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 V DD. The diode D1 provides additional reverse voltage protection. R2 C2 VDD GND OUT C1 R1:100 R2 C2 VDD GND OUT C1 Z1 D1 Automotive and Severe Environment Protection Circuit Typical Three-Wire Application Circuit SS1881 SS1881 |
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