A1150 ALLEGRO [Allegro MicroSystems], A1150 Datasheet

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A1150

Manufacturer Part Number
A1150
Description
Chopper-Stabilized, Two Wire Hall-Effect Switches
Manufacturer
ALLEGRO [Allegro MicroSystems]
Datasheet
Packages
Features and Benefits
▪ High speed, 4-phase chopper stabilization
▪ Low switchpoint drift throughout temperature range
▪ Low sensitivity to thermal and mechanical stresses
▪ On-chip protection
▪ Solid-state reliability
▪ Robust EMC and ESD performance
▪ Industry leading ISO 7637-2 performance through use of
A1152-DS, Rev. 3
▫ Supply transient protection
▫ Reverse battery protection
▫ On-board voltage regulator
▫ 3.0 to 24 V operation
proprietary, 40-V clamping structures
3-pin SOT23-W
2 mm × 3 mm × 1 mm
(suffix LH)
Approximate footprint
V+
0.01 μF
VCC
3-pin ultramini SIP
1.5 mm × 4 mm × 3 mm
(suffix UA)
Chopper-Stabilized, Two Wire Hall-Effect Switches
A1150, A1152, A1153, A1155, A1156, A1157, and A1158
Functional Block Diagram
Clock/Logic
Regula
Amp
tor
To all subcircuits
Description
The A1150, A1152, A1153, A1155, A1156, A1157, and A1158
comprise a family of two-wire, unipolar, Hall-effect switches,
which are factory-trimmed to optimize magnetic switchpoint
accuracy. These devices are produced on the Allegro® advanced
BiCMOS wafer fabrication process, which implements
a patented high frequency, 4-phase, chopper-stabilization
technique. This technique achieves magnetic stability over
the full operating temperature range, and eliminates offsets
inherent in devices with a single Hall element that are exposed
to harsh application environments.
The A115x family has a number of automotive applications.
These include sensing seat track position, seat belt buckle
presence, hood/trunk latching, and shift selector position.
Two-wire unipolar switches are particularly advantageous in
cost-sensitive applications because they require one less wire
for operation versus the more traditional open-collector output
switches. 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.
Continued on the next page…
Low-Pass
Filter
Schmitt
Trigger
UA package only
Polarity
GND
GND

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A1150 Summary of contents

Page 1

... A1152-DS, Rev. 3 A1150, A1152, A1153, A1155, A1156, A1157, and A1158 Description The A1150, A1152, A1153, A1155, A1156, A1157, and A1158 comprise a family of two-wire, unipolar, Hall-effect switches, which are factory-trimmed to optimize magnetic switchpoint accuracy. These devices are produced on the Allegro® advanced ...

Page 2

... The 3-pin, ultra-mini, single inline package (SIP) for through-hole mounting. Both packages are lead (Pb) free, with 100% matte tin leadframe plating. Selection Guide Part 1 Packing Number A1150LLHLX-T 13-in. reel, 10 000 pieces/reel A1150LUA-T 2 Bulk, 500 pieces/bag A1152LLHLX-T 13-in. reel, 10 000 pieces/reel A1152LUA-T 2 Bulk, 500 pieces/bag A1153LLHLX-T 13-in ...

Page 3

... A1150, A1152, A1153, A1155, A1156, A1157, and A1158 ELECTRICAL CHARACTERISTICS range; unless otherwise noted Characteristics Supply Voltage 1,2 Supply Current Supply Zener Clamp Voltage Supply Zener Clamp Current Reverse Supply Current Output Slew Rate 3 Chopping Frequency Power-Up Time 4,5 Power-Up State 2,4,6 represents the generated voltage between the VCC pin and the GND pin. ...

Page 4

... A1150, A1152, A1153, A1155, A1156, A1157, and A1158 may require derating at maximum conditions, see application information Thermal Characteristics Characteristic Package Thermal Resistance *Additional thermal information available on the Allegro website Symbol Test Conditions* Package LH, on 1-layer PCB with copper limited to solder pads R Package LH, on 2-layer PCB with 0 ...

Page 5

... A1150, A1152, A1153, A1155, A1156, A1157, and A1158 A1152/A1153/A1155/A1156 Average Supply Current (Low) versus Temperature 7 5.5 5.0 -60 -40 - Ambient Temperature, T A1150/A1157/A1158 Average Supply Current (Low) versus Temperature 5.0 5.0 4.5 4.5 4.0 4 3 3.0 3.0 2.5 2.5 2.0 2.0 -60 -60 -40 -40 -20 -20 ...

Page 6

... A1150, A1152, A1153, A1155, A1156, A1157, and A1158 A1150/A1152/A1153 Average Operate Point versus Temperature 110 100 -60 -40 - Ambient Temperature, T A1150/A1152/A1153 Average Release Point versus Temperature 105 3 -60 -40 - ...

Page 7

... B HYS (A) Hysteresis curve for A1150, A1152, A1155, and A1157 Figure 1. Alternative switching behaviors are available in the A115x 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) ...

Page 8

... A1150, A1152, A1153, A1155, A1156, A1157, and A1158 V+ VCC A115x GND GND A ECU R SENSE (A) Low side sensing Figure 2. Typical application circuits 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 that can be produced at the output of the Hall sensor IC ...

Page 9

... A1150, A1152, A1153, A1155, A1156, A1157, and A1158 Power Derating The device must be operated below the maximum junction tem- perature of the device, T (max). Under certain combinations of J peak conditions, reliable operation may require derating supplied power or improving the heat dissipation properties of the appli- cation ...

Page 10

... A1150, A1152, A1153, A1155, A1156, A1157, and A1158 +0.12 2.98 –0.08 3 +0.10 2.90 –0. 10° REF 0.95 BSC For Reference Only; not for tooling use (reference DWG-2840) Dimensions in millimeters Dimensions exclusive of mold flash, gate burrs, and dambar protrusions Exact case and lead configuration at supplier discretion within limits shown Active Area Depth, 0 ...

Page 11

... A1150, A1152, A1153, A1155, A1156, A1157, and A1158 4.09 45° E 2.05 NOM 1.44 NOM +0.08 E 3.02 –0.05 1.02 MAX 1 14.99 ±0.25 +0.05 0.43 –0.07 Package UA, 3-Pin SIP +0.08 –0. 1.52 ±0.05 10° E Mold Ejector Pin Indent 45° Branded Face 0.79 REF +0.03 0.41 –0.06 1.27 NOM Chopper-Stabilized, Two Wire Hall-Effect Switches NNN 1 D Standard Branding Reference View ...

Page 12

... A1150, A1152, A1153, A1155, A1156, A1157, and A1158 Revision History Revision Rev. 3 Copyright ©2009-2011, Allegro MicroSystems, Inc. Allegro MicroSystems, Inc. reserves the right to make, from time to time, such de par tures from the detail spec tions as may be required to per- mit improvements in the per for mance, 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’ ...

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