A3150JUA Allegro MicroSystems, Inc., A3150JUA Datasheet

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A3150JUA

Manufacturer Part Number
A3150JUA
Description
Programmable, Chopper- Stabilized, Hall-effect Switch
Manufacturer
Allegro MicroSystems, Inc.
Datasheet
PRELIMINARY INFORMATION
(subject to change without notice)
Supply Voltage, V
Reverse Supply Voltage, V
Overvoltage Supply Current, I
Magnetic Flux Density, B ............ Unlimited
Output Current, I
Output OFF Voltage, V
Reverse Output Current, I
Operating Temperature Range,
Storage Temperature, T
ABSOLUTE MAXIMUM RATINGS
T
A
............................... -40 C to +115 C
V
April 12, 1999
CC
1
at T
OUT
CC
A
........................... 26.5 V
..... Internally Limited
2
= 25 C
OUT
S
PTCT
Dwg. PH-003-2
................... +170 C
ROUT
RCC
................. 26.5 V
CC
3
............ -30 V
......... -50 mA
..... 100 mA
STABILIZED, HALL-EFFECT SWITCH
3150
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
packaging. The small package can be easily assembled and used in
conjunction with a wide variety of gear/target shapes and sizes. The
two devices differ only in package style.
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.
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.
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.
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 .
The A3150JLT and A3150JUA programmable switches provide
The sensing technology used for this sensor is Hall-effect based.
A proprietary dynamic offset cancelation technique, with an
This sensor system is ideal for use in gathering speed, position, and
PROGRAMMABLE, CHOPPER-
Continued next page

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A3150JUA Summary of contents

Page 1

... S 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 packaging ...

Page 2

... Small Mechanical Size <50 s Power-On Time Wide Operating Voltage Range Defined Power-On State FUNCTIONAL BLOCK DIAGRAM PROGRAM LOGIC OFFSET ADJUST 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright © 2000, Allegro MicroSystems, Inc. 1 SUPPLY REG. POWER-UP OUTPUT 3 CONTROL CURRENT LIMIT <1 ...

Page 3

ELECTRICAL CHARACTERISTICS over operating voltage and temperature range (unless otherwise noted). Characteristic Symbol Supply Voltage Power-On State Low Output Voltage V Output Current Limit Output Leakage Current Supply Current Reverse Supply Current Power-On Delay Output Rise Time Output Fall Time ...

Page 4

PROGRAMMABLE, CHOPPER- STABILIZED, PRECISION, HALL-EFFECT SWITCH TYPICAL ELECTRICAL CHARACTERISTICS 5.0 B > 4.0 3.0 B < 2.0 1.0 -50 - AMBIENT TEMPERATURE IN C 300 OUT V = ...

Page 5

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 ...

Page 6

... PROGRAMMABLE, CHOPPER- STABILIZED, PRECISION, HALL-EFFECT SWITCH The A3150JLT and A3150JUA operate points are pro- grammed by serially addressing the device through the supply terminal (pin1). After the correct operate point is determined, the device programming bits are selected and then a “lock” set to prevent any further (accidental) programming ...

Page 7

Address Determination. The operate point is adjust- able in 64 increments. With the appropriate target or gear* in position, the 64 switch points are sequentially selected (figure 2) until the required operate point is reached. Note that the difference between ...

Page 8

PROGRAMMABLE, CHOPPER- STABILIZED, PRECISION, HALL-EFFECT SWITCH All Allegro sensors are subjected to stringent qualification requirements prior to being released to production. To become qualified, except for the destructive ESD tests, no failures are permitted. Qualification Test Test Method and ...

Page 9

SENSOR LOCATIONS ( 0.005” [0.13 mm] die placement) Package Designator “LT” ACTIVE AREA DEPTH 0.030" 0.76 mm NOM Package Designators “UA” and "UA-TL" ACTIVE AREA DEPTH 0.018" 0.46 mm NOM A BRANDED 1 2 SURFACE Although sensor ...

Page 10

PROGRAMMABLE, CHOPPER- STABILIZED, PRECISION, HALL-EFFECT SWITCH Dimensions in Inches (for reference only) 0.181 0.173 0.072 0.064 0.102 0.167 0.090 0.155 0.0189 0.047 0.0142 0.035 0.0221 0.0173 0.059 BSC 0.118 BSC 0.098 0.079 B 0.031 0.102 A ...

Page 11

Dimensions in Inches (controlling dimensions) 0.164 0.159 45 0.122 0.117 0.085 MAX 0.640 0.600 SEE NOTE 0.050 BSC 0.095 0.005 0.002 MAX 0 –8 0.004 0.020 MAX MIN FLAT NOTES: 1. Tolerances on package height and width ...

Page 12

... Allegro MicroSystems, Inc. reserves the right to make, from time to time, such departures from the detail specifications as may be required to permit improvements in the performance, reliability, or manufacturability of its products. Before placing an order, the user is cautioned to verify that the information being relied upon is current ...

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