SS1881 Просмотр технического описания (PDF) - SEC Electronics Inc.
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SS1881 Datasheet PDF : 9 Pages
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SS1881
Hall Latch - High Sensitivity
Pin Definitions and Descriptions
SOT Pin № SIP Pin №
1
1
2
3
3
2
Name
VDD
OUT
GND
Type
Supply
Output
Ground
Function
Supply Voltage pin
Open Drain Output pin
Ground pin
Detailed General Description
The SS1881 exhibits latch magnetic switching characteristics. Therefore, it requires both south and north poles to
operate properly.
The OUT pin of these devices switches low (turns on) when a magnetic field perpendicular to the Hall sensor ex-
ceeds the operate point threshold, BOP. After turn-on, the output voltage is VDSon. Note that the device latches, that
is, a south pole of sufficient strength towards the branded surface of the device turns the device on. The device re-
mains on if the south pole is removed (B→0). This latching property defines the device as a magnetic memory.
When the magnetic field is reduced below the release point, BRP , the OUT pin turns off (goes high). The differ-
ence in the magnetic operate and release points is the hysteresis, BHYS , of the device. This built-in hysteresis pre-
vents output oscillation near the switching point, and allows clean switching of the output even in the presence of
external mechanical vibration and electrical noise.
The device behaves as a latch with symmetric operating and release switching points (BOP=|BRP|). This means
magnetic fields with equivalent strength and opposite direction drive the output high and low.
Powering-on the device in the hysteresis region (less than BOP and higher than BRP) allows an indeterminate output
state. The correct state is attained after the fi rst excursion beyond BOP or BRP .
Output level
Output level
OUT = High
OUT = High
BHYS
BHYS
BRP
-18Gs typ
OUT = Low
0mT
BOP
18Gs typ
Flux density
UA package - Latch characteristic
BRP
-18Gs typ
OUT = Low
0mT
BOP
18Gs typ
Flux density
SO package - Latch characteristic
The SOT-23 device is reversed from the UA package. The SOT-23 output transistor will be latched on in the pres-
ence of a sufficiently strong North pole magnetic field applied to the marked face.
3
V3.10 Nov 1, 2013
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