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SS275LSOT Fiches technique(PDF) 4 Page - SEC Electronics Inc.

No de pièce SS275LSOT
Description  CMOS Omnipolar High Sensitivity Micropower Hall Switch
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Fabricant  SECELECTRONICS [SEC Electronics Inc.]
Site Internet  http://www.secsemi.com
Logo SECELECTRONICS - SEC Electronics Inc.

SS275LSOT Fiches technique(HTML) 4 Page - SEC Electronics Inc.

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SS275
CMOS Omnipolar High Sensitivity Micropower Hall Switch
4
V3.10 Nov 1, 2013
Installation Comments
Consider temperature coefficients of Hall IC and magnetics , as well as air gap and life time variations. Observe
temperature limits during wave soldering. Typical IR solder-reflow profile:
No Rapid Heating and Cooling.
Recommended Preheating for max. 2minutes at 150
°C
Recommended Reflowing for max. 5seconds at 240
°C
Application Informatio
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 following
two figures, 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 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 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 recom-
mended that the second 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. Both solu-
tions provide the required reverse voltage protection.
SS275
R2
10k
C2
4.7n
VDD
GND
OUT
C1
100n
SS275
R1:100
R2
10k
C2
4.7n
VDD
GND
OUT
C1
100
Z1
D1
Automotive and Severe Environment
Protection Circuit
Typical Three-Wire Application Circuit


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