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SS1881ESOT Folha de dados(PDF) 6 Page - SEC Electronics Inc.

Nome de Peças SS1881ESOT
Descrição Electrónicos  Hall Latch - High Sensitivity
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Fabricante Electrônico  SECELECTRONICS [SEC Electronics Inc.]
Página de início  http://www.secsemi.com
Logo SECELECTRONICS - SEC Electronics Inc.

SS1881ESOT Folha de dados(HTML) 6 Page - SEC Electronics Inc.

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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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