A1183 ALLEGRO [Allegro MicroSystems], A1183 Datasheet

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A1183

Manufacturer Part Number
A1183
Description
Sensitive Two-Wire Field-Programmable Chopper-Stabilized Unipolar Hall-Effect Switches
Manufacturer
ALLEGRO [Allegro MicroSystems]
Datasheet
Features and Benefits
▪ Chopper stabilization
▪ Field programmable for optimized switchpoints
▪ On-chip protection
Packages: 3 pin SOT23W (suffix LH), and
3 pin SIP (suffix UA)
Not to scale
A1180-DS, Rev. 5
▫ 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
Sensitive Two-Wire Field-Programmable Chopper-Stabilized
temperature range
V+
0.01 uF
VCC
Functional Block Diagram
Clock/Logic
Amp
Program/Lock
Programming
Logic
Unipolar Hall-Effect Switches
Description
The A1180, A1181, A1182, and A1183 devices are sensitive,
two-wire, unipolar, Hall effect switches. The operate point, B
can be field-programmed, after final packaging of the sensor
and placement into the application. This advanced feature
allows the optimization of the sensor switching performance,
by effectively accounting for variations caused by mounting
tolerances for the device and the target magnet.
This family of devices are produced on the Allegro
MicroSystems advanced BiCMOS wafer fabrication process,
which implements a patented, high-frequency, chopper-
stabilization technique that achieves magnetic stability and
eliminates the offsets that are inherent in single-element devices
exposed to harsh application environments. Commonly found
in a number of automotive applications, the A1180-83 family of
devices are utilized to sense: seat track position, seat belt buckle
presence, hood/trunk latching, and shift selector position.
Two-wire unipolar switches are particularly advantageous
in price-sensitive applications, because they require one
less wire than the more traditional open-collector output
Continued on the next page…
A1180, A1181, A1182, and A1183
Low-Pass
Filter
Offset
Package UA Only
Regulator
GND
GND
OP
,

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A1183 Summary of contents

Page 1

... A1180, A1181, A1182, and A1183 Unipolar Hall-Effect Switches Description The A1180, A1181, A1182, and A1183 devices are sensitive, two-wire, unipolar, Hall effect switches. The operate point, B can be field-programmed, after final packaging of the sensor and placement into the application. This advanced feature ...

Page 2

... The A1180-83 family of devices also features on-chip transient protection, and a Zener clamp to protect against overvoltage conditions on the supply line. The output currents of the A1181 and A1183 switch presence of a south polarity magnetic fi eld of suffi cient strength; and switch otherwise, including when there is no signifi ...

Page 3

... over the operating voltage and temperature range, unless otherwise specifi ed Symbol Test Conditions for A1180 and A1182 CC CC(H) B OPrange for A1181 and A1183 CC CC( OPinit 25°C RES CC A Switchpoint setting – Programming locking ∆ ...

Page 4

... Ambient Temperature, T (° ( 150 200 Hysteresis versus Ambient Temperature at Various Levels (A1180, A1181, A1182, A1183 - 100 150 Ambient Temperature, T (°C) A Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www ...

Page 5

... A1180, A1181, A1182, A1183 and Chopper-Stabilized Unipolar Hall Effect Switches EMC (Electromagnetic Compatibility) Requirements Sensitive Two-Wire Field-Programmable Device Qualifi cation Program Contact Allegro for information. Contact your local representative for EMC results. Test Name Reference Specifi cation ESD – Human Body Model AEC-Q100-002 ESD – ...

Page 6

... A1180, A1181, A1182, A1183 and 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. Sensitive Two-Wire Field-Programmable Symbol Test Conditions* Package LH, 1-layer PCB with copper limited to solder pads Package LH, 2-layer PCB with 0 ...

Page 7

... Sensitive Two-Wire Field-Programmable Functional Description in hysteresis allows clean switching of the output even in the presence of external mechanical vibration and electrical noise. The A1181 and A1183 devices switch with opposite polarity for , the device output goes similar B A1183 (see fi gure 1). . This built- ...

Page 8

... A1180, A1181, A1182, A1183 and Chopper-Stabilized Unipolar Hall Effect Switches Chopper Stabilization Technique A limiting factor for switchpoint accuracy when using Hall effect technology is the small signal voltage developed across the Hall element. This voltage is proportionally small relative to the offset that can be produced at the output of the Hall sensor device. This makes it diffi ...

Page 9

... A1180, A1181, A1182, A1183 and Chopper-Stabilized Unipolar Hall Effect Switches For additional general application information, visit the Allegro MicroSystems Web site at www. allegromicro.com. Typical Application Circuit The A118x family of devices must be protected by an external bypass capacitor connected between the supply, VCC, BYP and the ground, GND, of the device ...

Page 10

... A1180, A1181, A1182, A1183 and 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 or improving the heat dissipation properties of the application ...

Page 11

... A1180, A1181, A1182, A1183 and Chopper-Stabilized Unipolar Hall Effect Switches Programming Protocol The operate switchpoint can be fi eld-programmed so, a coded series of voltage pulses through the VCC pin is used to set bitfi elds in onboard registers. The effect on the device output can be monitored, and the registers can be cleared and set repeatedly until the required B is achieved ...

Page 12

... A1180, A1181, A1182, A1183 and Chopper-Stabilized Unipolar Hall Effect Switches The pulse sequences consist of the following groups of pulses enable sequence bitfi eld address sequence. 3. When permanently setting the bitfi eld, a long V ing pulse. (Note: Blown bit fuses cannot be reset.) 4. When permanently setting the bitfi ...

Page 13

... A1180, A1181, A1182, A1183 and Chopper-Stabilized Unipolar Hall Effect Switches The fi rst segment of code is a Enabling Addressing Mode. keying sequence used to enable the bitfi eld addressing mode. As shown in fi gure 7, this segment consists of one short V one V pulse, and one short V ...

Page 14

... A1180, A1181, A1182, A1183 and 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, gate burrs, and dambar protrusions ...

Page 15

... A1180, A1181, A1182, A1183 and 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 patents pending. ...

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