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A1145 Schematic ( PDF Datasheet ) - Allegro MicroSystems

Teilenummer A1145
Beschreibung (A1145 / A1146) Ultrasensitive Two-Wire Chopper-Stabilized Unipolar Hall Effect Switches
Hersteller Allegro MicroSystems
Logo Allegro MicroSystems Logo 




Gesamt 12 Seiten
A1145 Datasheet, Funktion
A1145 and A1146
Ultrasensitive Two-Wire Chopper-Stabilized
Unipolar Hall Effect Switches
Features and Benefits
Chopper stabilization
Low switchpoint drift over operating
temperature range
Low sensitivity to stress
Factory programmed at end-of-line for optimized
switchpoints
On-chip protection
Supply transient protection
Reverse-battery protection
On-board voltage regulator
3.5 to 24 V operation
Packages: 3 pin SOT23W (suffix LH), and
3 pin SIP (suffix UA)
Description
The A1145 and A1146 devices are two-wire, unipolar, Hall
effect switches that are factory-programmed at end-of-line to
optimize ultrasensitive magnetic switchpoint accuracy. These
devices use a patented high frequency chopper-stabilization
technique, produced using the Allegro advanced BiCMOS
wafer fabrication process, to achieve magnetic stability and
to eliminate offset inherent in single-element devices exposed
to harsh application environments.
Commonly found in a number of automotive applications,
these switches are utilized to sense seat track position, seat
belt buckle presence, hood/trunk latching, and shift selector
position. Two-wire unipolar switches, such as the A1145
and A1146, are particularly advantageous in price-sensitive
applications because they require one less wire for operation
than do switches with the more traditional open-collector output.
Additionally, the system designer inherently gains diagnostics
because there is always output current flowing, which should
be in either of two narrow ranges. Any current level not within
these ranges indicates a fault condition. These devices also
www.DataSheet4U.com
Not to scale
V+
VCC
Continued on the next page…
Functional Block Diagram
0.01 uF
Clock/Logic
Amp
Regulator
To All Subcircuits
Low-Pass
Filter
A1145-DS, Rev. 8
GND
Package UA Only
GND






A1145 Datasheet, Funktion
A1145 and
A1146
Ultrasensitive Two-Wire Chopper-Stabilized
Unipolar Hall Effect Switches
Functional Description
Operation
The output, ICC, of the A1145 device switches low after the mag-
netic field at the Hall sensor exceeds the operate point threshold,
BOP. When the magnetic field is reduced to below the release
point threshold, BRP, the device output goes high. The differ-
ences between the magnetic operate and release point is called
the hysteresis of the device, BHYS. This built-in hysteresis allows
clean switching of the output even in the presence of external
mechanical vibration and electrical noise. The A1146 device
switches with opposite polarity for similar BOP and BRP values,
in comparison to the A1145 (see figure 1).
I+
ICC(H)
I+
ICC(H)
0
B–
ICC(L)
B+
0
B–
ICC(L)
B+
BHYS
(A) A1145
BHYS
(B) A1146
Figure 1. Alternative switching behaviors are available in the A114x device family. On the horizontal axis, the B+ direction indicates
increasing south polarity magnetic field strength, and the B– direction indicates decreasing south polarity field strength (including the
case of increasing north polarity).
Allegro MicroSystems, Inc.
6
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com

6 Page









A1145 pdf, datenblatt
A1145 and
A1146
Ultrasensitive Two-Wire Chopper-Stabilized
Unipolar Hall Effect Switches
Package UA, 3-Pin SIP
.164 4.17
.159 4.04
.122 3.10
.117 2.97
D .0805 2.04
NOM
.0565 1.44
NOM D
.085 2.16
MAX
A
.062 1.57
.058 1.47
D
B
.031 0.79
REF
C
.640 16.26
.600 15.24
.017 0.44
.014 0.35
12
3
.019 0.48
.014 0.36
.050 1.27
NOM
Dimensions in inches
Metric dimensions (mm) in brackets, for reference only
A Dambar removal protrusion (6X)
B Ejector mark on opposite side
C Active Area Depth .0195 [0.50] NOM
D Hall element (not to scale)
The products described herein are manufactured under one or more of the following U.S. patents: 5,045,920; 5,264,783; 5,442,283; 5,389,889;
5,581,179; 5,517,112; 5,619,137; 5,621,319; 5,650,719; 5,686,894; 5,694,038; 5,729,130; 5,917,320; and other patents pending.
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.
Allegro products are not authorized for use as critical components in life-support devices or systems without express written approval.
The information included herein is believed to be accurate and reliable. However, Allegro MicroSystems, Inc. assumes no responsibility for its
use; nor for any infringement of patents or other rights of third parties which may result from its use.
Copyright © 2004, 2006 Allegro MicroSystems, Inc.
Allegro MicroSystems, Inc.
12
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com

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