SS5682
Unipolar Hall Switch
Output Behaviour versus Magnetic Pole
DC Operating Parameters TA = -40 C to 150 C, VDD = 2.5V to 24V (unless otherwise specified)
Parameter
North pole (TO)
South pole (SOT)
Null or weak magnetic field
Test Conditions
B> B
OP
B> B
OP
B= 0 or B < BRP
Out
Low
Low
High
Table : Output behaviour versus magnetic pole
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 generated 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 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 = V
CC 2
/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. 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
occurring on the device supply voltage VDD. The diode D1 provides additional reverse voltage protection.
Typical Three-Wire Application Circuit
Automotive and Severe
Environment Protection Circuit
R1:100
C1
VDD
R2
OUT
C2
D1
Z1
C1
VDD
R2
OUT
C2
SS5682
GND
SS5682
GND
5
V2.00 May 1, 2012
SECELECTRONICS [ SEC Electronics Inc. ]
