A1147ELHLT Allegro Microsystems Inc, A1147ELHLT Datasheet

IC SWITCH HALL EFFECT UNI SOT-23

A1147ELHLT

Manufacturer Part Number
A1147ELHLT
Description
IC SWITCH HALL EFFECT UNI SOT-23
Manufacturer
Allegro Microsystems Inc
Type
Unipolar Switchr
Datasheets

Specifications of A1147ELHLT

Sensing Range
80G Trip, 10G Release
Voltage - Supply
3.5 V ~ 24 V
Current - Supply
5mA
Output Type
Digital, Open Collector
Features
Regulated Voltage
Operating Temperature
-40°C ~ 85°C
Package / Case
SOT-23W
Magnetic Type
Unipolar
Operating Supply Voltage (min)
3.5V
Operating Supply Voltage (typ)
5/9/12/15/18V
Operating Supply Voltage (max)
24V
Mag Sensor Operate Point (g)
80Gs
Mag Sensor Release Point (g)
10Gs
Mag Sensor Hysteresis(g)
15Gs
Package Type
SOT-23W
Pin Count
3
Mounting
Surface Mount
Operating Temp Range
-40C to 85C
Operating Temperature Classification
Industrial
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Current - Output (max)
-
Lead Free Status / Rohs Status
Not Compliant
Features and Benefits
▪ Chopper stabilization
▪ Factory programmed at end-of-line for optimized
▪ On-chip protection
Packages: 3 pin SOT23W (suffix LH), and
3 pin SIP (suffix UA)
Not to scale
A1147-DS, Rev. 8
switchpoints
▫ Low switchpoint drift over operating
▫ Low sensitivity to stress
▫ Supply transient protection
▫ Reverse-battery protection
▫ On-board voltage regulator
▫ 3.5 to 24 V operation
temperature range
Low Current Ultrasensitive Two-Wire Chopper-Stabilized
V+
0.01 uF
VCC
Functional Block Diagram
Clock/Logic
Amp
Low-Pass
Filter
Regulator
Unipolar Hall Effect Switches
Description
The A1147 and A1148 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 A1147
and A1148, 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
Continued on the next page…
To All Subcircuits
Package UA Only
GND
A1147 and A1148
GND

Related parts for A1147ELHLT

A1147ELHLT Summary of contents

Page 1

Low Current Ultrasensitive Two-Wire Chopper-Stabilized 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 ▫ ...

Page 2

... Samples are no longer available. Status change: October 31, 2006. Deadlilne for receipt of LAST TIME BUY ORDERS: April 27, 2007. These variants include: A1147ELHLT, A1147EUA, A1147LLHLT, A1147LUA, A1148ELHLT, A1148EUA, and, A1148LLHLT. b. Certain variants cited in this footnote are in production but have been determined to be NOT FOR NEW DESIGN. This classification indicates that sale of this device is currently restricted to existing customer applications ...

Page 3

A1147 and A1148 Chopper-Stabilized Unipolar Hall Effect Switches ELECTRICAL CHARACTERISTICS Characteristic Symbol Supply Voltage 1 2 Supply Current Reverse Supply Current Supply Zener Clamp Voltage V ZSUPPLY 3 Supply Zener Clamp Current I ZSUPPLY Output Slew Rate 4 Chopping Frequency ...

Page 4

A1147 and A1148 Chopper-Stabilized Unipolar Hall Effect Switches Supply Current (Low) versus Ambient Temperature at Various Levels of V (A1147 and A1148 – 100 Ambient Temperature, T Operate Point versus Ambient Temperature ...

Page 5

A1147 and A1148 Chopper-Stabilized Unipolar Hall Effect Switches THERMAL CHARACTERISTICS may require derating at maximum conditions, see application information Characteristic Package Thermal Resistance *Additional thermal information available on Allegro Web site. Low Current Ultrasensitive Two-Wire Symbol Test Conditions* Package LH, ...

Page 6

A1147 and A1148 Chopper-Stabilized Unipolar Hall Effect Switches Operation The output the A1147 device switches low after the mag- CC netic field at the Hall sensor exceeds the operate point threshold When the magnetic field ...

Page 7

A1147 and A1148 Chopper-Stabilized Unipolar Hall Effect Switches Chopper Stabilization Technique When using Hall-effect technology, a limiting factor for switchpoint accuracy is the small signal voltage developed across the Hall element. This voltage is disproportionally small relative to the offset ...

Page 8

A1147 and A1148 Chopper-Stabilized Unipolar Hall Effect Switches Typical Application Circuit The A114x family of devices must be protected by an external bypass capacitor connected between the supply, VCC, BYP and the ground, GND, of the device. C ...

Page 9

A1147 and A1148 Chopper-Stabilized Unipolar Hall Effect Switches Power Derating The device must be operated below the maximum junction temperature of the device Under certain combinations of J(max) peak conditions, reliable operation may require derating sup- plied power ...

Page 10

A1147 and A1148 Chopper-Stabilized Unipolar Hall Effect Switches EMC (Electromagnetic Compatibility) Requirements Package LH, 3-pin SOT VCC connection 3. GND Low Current Ultrasensitive Two-Wire Device Qualification Program Contact Allegro for information. Contact your ...

Page 11

A1147 and A1148 Chopper-Stabilized Unipolar Hall Effect Switches Preliminary dimensions, for reference only Dimensions in millimeters U.S. Customary dimensions (in.) in brackets, for reference only (reference JEDEC TO-236 AB, except case width and terminal tip-to-tip) Dimensions exclusive of mold flash, ...

Page 12

A1147 and A1148 Chopper-Stabilized Unipolar Hall Effect Switches .122 .117 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 ...

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