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PDF A3150 Data sheet ( Hoja de datos )
| Número de pieza | A3150 | |
| Descripción | PROGRAMMABLE/ CHOPPERSTABILIZED/ HALL-EFFECT SWITCH | |
| Fabricantes | Allegro MicroSystems | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de A3150 (archivo pdf) en la parte inferior de esta página. Total 12 Páginas | ||
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3150
PROGRAMMABLE, CHOPPER-
STABILIZED, HALL-EFFECT SWITCH
The A3150JLT and A3150JUA programmable switches provide
tooth/valley recognition in large gear-tooth sensing applications. Each
sensor consists of a single element, chopper-stabilized Hall-effect IC
that can be programmed to the desired magnetic switch point, opti-
mizing sensor airgap and timing accuracy performance after final
PTCT
packaging. The small package can be easily assembled and used in
V
TCC
UC .1 2
3
PRODE ONsLiYgnDwg.PH-003-2
ED NC dePRELIMINARY INFORMATION
U E(subject to change without notice)
IN R wApril 12, 1999
NT FE r neABSOLUTE MAXIMUM RATINGS
CO RE foat TA = 25°C
Supply Voltage, VCC ........................... 26.5 V
0Reverse Supply Voltage, VRCC ............ -30 V
IS R 5Overvoltage Supply Current, ICC ..... 100 mA
D O 2Magnetic Flux Density, B ............ Unlimited
F 3Output Current, IOUT ..... Internally Limited
Output OFF Voltage, VOUT ................. 26.5 V
AReverse Output Current, IROUT ......... -50 mA
— eOperating Temperature Range,
TA ............................... -40°C to +115°C
UsStorage Temperature, TS ................... +170°C
conjunction with a wide variety of gear/target shapes and sizes. The
two devices differ only in package style.
The sensing technology used for this sensor is Hall-effect based.
The sensor incorporates a single-element Hall IC that switches in
response to magnetic signals created by a ferrous target. The program-
mability of the circuit eliminates magnet and system offsets such as
those caused by tilt yet provides zero-speed detection capabilities
without the associated running jitter inherent in classical digital solu-
tions.
A proprietary dynamic offset cancelation technique, with an
internal high-frequency clock, reduces the residual offset voltage,
which is normally caused by device overmolding, temperature
dependancies, and thermal stress. This technique produces devices that
have an extremely stable quiescent output voltage, are immune to
mechanical stress, and have precise recoverability after temperature
cycling. Many problems normally associated with low-level analog
signals are minimized by having the Hall element and amplifier in a
single chip. Output precision is obtained by internal gain adjustments
during the manufacturing process and operate-point programming in the
user’s application.
This sensor system is ideal for use in gathering speed, position, and
timing information using gear-tooth-based configurations. The
A3150JLT/JUA are particularly suited to those applications that require
accurate duty cycle control or accurate edge detection. The lower
vibration sensitivity also makes these devices extremely useful for
transmission speed sensing.
Continued next page
Always order by complete part number: the prefix 'A' + the basic four-digit
part number + a suffix to indicate operating temperature range +
a suffix to indicate package style, e.g., A3150JLT .
1 page  
3150
PROGRAMMABLE, CHOPPER-
STABILIZED, PRECISION,
HALL-EFFECT SWITCH
FUNCTIONAL DESCRIPTION
Chopper-Stabilized Technique. These devices use a
proprietary dynamic offset cancellation technique, with an
internal high-frequency clock to reduce the residual offset
voltage of the Hall element that is normally caused by device
overmolding, temperature dependencies, and thermal stress.
This technique produces devices that have an extremely stable
quiescent Hall output voltage, are immune to thermal stress, and
have precise recoverability after temperature cycling. This
technique will also slightly degrade the device output repeatabil-
ity.
The Hall element can be considered as a resistor array
similar to a Wheatstone bridge. A large portion of the offset is a
result of the mismatching of these resistors. The chopper-
stabilizing technique cancels the mismatching of the resistors by
changing the direction of the current flowing through the Hall
plate and Hall voltage measurement taps, while maintaining the
Hall-voltage signal that is induced by the external magnetic flux.
The signal is, then, captured by a sample-and-hold circuit.
Operation. The output of these devices switches low (turns
ON) when a magnetic field (south pole) perpendicular to the
Hall sensor exceeds the operate point threshold (BOP). After
turn-ON, the output is capable of sinking 25 mA and the output
voltage is VOUT(SAT). When the magnetic field is reduced below
the release point (BRP), the device output goes high (turns OFF).
The difference in the magnetic operate and release points is the
hysteresis (Bhys) of the device. This built-in hysteresis allows
clean switching of the output even in the presence of external
mechanical vibration and electrical noise.
Applications. It is strongly recommended that an external
bypass capacitor be connected (in close proximity to the Hall
sensor) between the supply and ground of the device to reduce
both external noise and noise generated by the chopper-stabiliza-
tion technique.
B
+V
+V
VCC
0
0
The simplest form of magnet that will operate these devices
is a bar magnet with the south-seeking pole towards the branded
surface of the device. Many other methods of operation are
possible. Extensive applications information on magnets and
Hall-effect sensors is also available in the Allegro Electronic
Data Book AMS-702 or Application Note 27701, or
www.allegromicro.com
REG
X
—
HALL
VOLTAGE
+
Dwg. AH-011-2
Dwg. EH-012
B RP
B OP
FLUX DENSITY
VOUT(SAT)
+B
Dwg. GH-007-2
SUPPLY
OUTPUT
0.1 µF
SUPPLY
Dwg. EH-013
www.allegromicro.com
5 Page 
3150
PROGRAMMABLE, CHOPPER-
STABILIZED, PRECISION,
HALL-EFFECT SWITCH
PACKAGE DESIGNATOR 'UA'
Dimensions in Inches
(controlling dimensions)
0.164
0.159
0.062
45° 0.058
Dimensions in Millimeters
(for reference only)
4.17
4.04
1.57
45° 1.47
0.122
0.117
0.085 1 2 3 0.031
MAX
0.640
0.600
SEE NOTE
0.0189
0.0142
45°
0.0173
0.0138
3.10
2.97
2.16 1 2 3 0.79
MAX
16.26
15.24
SEE NOTE
0.48
0.36
45°
0.44
0.35
0.050
BSC
Dwg. MH-014E in
1.27
BSC
Surface-Mount Lead Form (Suffix '-TL')
0.095
±0.005
2.41
±0.13
Dwg. MH-014E mm
0.002
MAX
0.051
MAX
0.004 0°–8°
MAX
0.020
MIN
FLAT
Dwg. MH-015 in
0.10 0°–8°
MAX
0.51
MIN
FLAT
Dwg. MH-015 mm
NOTES: 1. Tolerances on package height and width represent allowable mold offsets. Dimensions given are measured at the widest point (parting line).
2. Exact body and lead configuration at vendor’s option within limits shown.
3. Height does not include mold gate flash.
4. Recommended minimum PWB hole diameter to clear transition area is 0.035” (0.89 mm).
5. Where no tolerance is specified, dimension is nominal.
www.allegromicro.com
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet A3150.PDF ] | |
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