A1645LK-I2 Allegro Microsystems Inc, A1645LK-I2 Datasheet

A1645LK-I2

Manufacturer Part Number

A1645LK-I2

Description

IC SENSOR HALL EFFECT AC 4-SIP

Manufacturer

Allegro Microsystems Inc

Type

Special Purposer

Datasheet

1.A1642LKNTN-I1-T.pdf (14 pages)

Specifications of A1645LK-I2

Sensing Range

120mV Trip, 120mV Release

Voltage - Supply

4 V ~ 24 V

Current - Supply

8.4mA

Output Type

Digital, Open Collector

Operating Temperature

-40°C ~ 150°C

Package / Case

4-SIP

Lead Free Status / RoHS Status

Contains lead / RoHS non-compliant

Current - Output (max)

Features

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Features and Benefits

▪ Running mode calibration for continuous optimization

▪ Single chip IC for high reliability

▪ Internal current regulator for 2-wire operation

▪ Precise duty cycle signal over operating temperature range

▪ Large operating air gaps

▪ Automatic Gain Control (AGC) for air gap independent

▪ Automatic Offset Adjustment (AOA) for signal processing

▪ True zero-speed operation

▪ Undervoltage lockout

▪ Wide operating voltage range

▪ Wide-lead package suitable for welding external

Package: 4-pin SIP (Suffix KN)

A1642LKN-DS, Rev. 3

switchpoints

optimization

components directly to the package leads or for welding

the device to a leadframe.

Peak-Detecting Sensor IC with Continuous Calibration

Automatic Offset

Tracking

Control

DAC

Two-Wire True Zero-Speed Miniature Differential

Amplifier

Hall

AOA DAC

Peak Hold

Not to scale

Functional Block Diagram

AGC DAC

Gain Control

Description

The A1642 is an optimized Hall effect sensing integrated

circuit that provides a user-friendly solution for true zero-speed

digital ring-magnet sensing in two-wire applications. This small

package can be easily assembled and used in conjunction with

a wide variety of target shapes and sizes.

The integrated circuit incorporates dual Hall effect elements

and signal processing that switches in response to differential

magnetic signals created by ring magnet poles. The circuitry

contains a sophisticated digital circuit to reduce system offsets,

to calibrate the gain for air-gap–independent switchpoints,

and to achieve true zero-speed operation. Signal optimization

occurs at power-on through the combination of offset and

gain adjust and is maintained throughout the operating time

with the use of a running-mode calibration. The running-mode

calibration allows immunity to environmental effects such as

micro-oscillations of the target or sudden air gap changes.

The regulated current output is configured for two-wire

applications and the A1642 is ideally suited for obtaining

speed and duty cycle information in ABS (antilock braking

systems). The 1.5 mm spacing between the dual Hall elements

is optimized for fine pitch ring-magnet–based configurations.

For applications requiring sensing of rotating ferrous gears and

targets, refer to the Allegro ATS series of products. The package

is lead (Pb) free, with 100% matte tin leadframe plating.

Gain

Internal Regulator

Test Signals

VCC

GND

Test

A1642

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A1645LK-I2 Summary of contents

Page 1

Two-Wire True Zero-Speed Miniature Differential Peak-Detecting Sensor IC with Continuous Calibration Features and Benefits ▪ Running mode calibration for continuous optimization ▪ Single chip IC for high reliability ▪ Internal current regulator for 2-wire operation ▪ Precise duty cycle signal ...

Page 2

A1642 Peak-Detecting Sensor IC with Continuous Calibration Selection Guide Part Number I CC A1642LKNTN-I1-T 6.0 Low to 14.0 High mA A1642LKNTN-I2-T 7.0 Low to 14.0 High mA *Contact Allegro for additional packing options Absolute Maximum Ratings Characteristic Supply Voltage Reverse ...

Page 3

A1642 Peak-Detecting Sensor IC with Continuous Calibration OPERATING CHARACTERISTICS T CHARACTERISTIC Symbol ELECTRICAL CHARACTERISTICS Supply Voltage Undervoltage Lockout V CC(UV) Supply Zener Clamp Voltage V Supply Zener Current I I CC(Low) Supply Current I CC(High) I Supply ...

Page 4

A1642 Peak-Detecting Sensor IC with Continuous Calibration OPERATING CHARACTERISTICS (continued) T Characteristic SWITCHPOINT CHARACTERISTICS Operating Speed Analog Signal Bandwidth Operate Point Release Point CALIBRATION Initial Calibration DAC CHARACTERISTICS Allowable User-Induced Differential Offset 6 FUNCTIONAL CHARACTERISTICS Operating Signal Range 7 Minimum ...

Page 5

A1642 Peak-Detecting Sensor IC with Continuous Calibration Supply Current (High) versus Ambient Temperature (I1 Trim - (°C) A Supply Current (Low) versus Ambient Temperature (I1 Trim -50 ...

Page 6

A1642 Peak-Detecting Sensor IC with Continuous Calibration Characteristic Allowable Air Gap Movement *Data based on study performed using spur gear reference target 60-0, and applicable to ring magnet targets with similar magnetic characteristics. The colored area in the chart above ...

Page 7

A1642 Peak-Detecting Sensor IC with Continuous Calibration THERMAL CHARACTERISTICS may require derating at maximum conditions, see application information CHARACTERISTIC Package Thermal Resistance *Additional information is available on the Allegro Web site. Two-Wire True Zero-Speed Miniature Differential Symbol TEST CONDITIONS* R ...

Page 8

A1642 Peak-Detecting Sensor IC with Continuous Calibration Sensing Technology The single-chip differential Hall effect sensor IC possesses two Hall elements, which sense the magnetic proﬁ the ring mag- net simultaneously, but at different points (spaced at a 1.5 ...

Page 9

A1642 Peak-Detecting Sensor IC with Continuous Calibration Automatic Gain Control (AGC) This feature allows the device to operate with an optimal internal electrical signal, regardless of the air gap (within the AG speci- ﬁ cation). During calibration, the device determines ...

Page 10

A1642 Peak-Detecting Sensor IC with Continuous Calibration Power Supply Protection The device contains an on-chip regulator and can operate over a wide V range. For devices that need to operate from an CC unregulated power supply, transient protection must be ...

Page 11

A1642 Peak-Detecting Sensor IC with Continuous Calibration DEVICE OPERATION Each operating mode is described in detail below. Power-On When power (V > applied to the device, a short CC CC(Min) period of time is required to power ...

Page 12

A1642 Peak-Detecting Sensor IC with Continuous Calibration 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 ...

Page 13

A1642 Peak-Detecting Sensor IC with Continuous Calibration 5.21 45° +0.08 3.43 –0.05 E1 2.16 MAX 6.00 REF 1 2 14.74 ±0.51 8.12 REF 0.38 REF 3.19 NOM Two-Wire True Zero-Speed Miniature Differential Package KN, 4-Pin SIP +0.08 –0. ...

Page 14

A1642 Peak-Detecting Sensor IC with Continuous Calibration Revision History Revision Rev. 3 Copyright ©2005-2011, Allegro MicroSystems, Inc. Allegro MicroSystems, Inc. reserves the right to make, from time to time, such de par tures from the detail spec ...

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