A3423LK-T Allegro Microsystems Inc, A3423LK-T Datasheet

IC DIRECTION SENSOR 2CH 4-SIP

A3423LK-T

Manufacturer Part Number
A3423LK-T
Description
IC DIRECTION SENSOR 2CH 4-SIP
Manufacturer
Allegro Microsystems Inc
Type
Special Purposer
Datasheets

Specifications of A3423LK-T

Package / Case
4-SIP
Sensing Range
55G Trip, -55G Release
Voltage - Supply
3.8 V ~ 24 V
Current - Supply
14mA
Current - Output (max)
30mA
Output Type
Digital, Open Collector
Features
Regulated Voltage
Operating Temperature
-40°C ~ 150°C
Output Current
30mA
Sensor Case Style
SIP
No. Of Pins
4
Supply Voltage Range
3.8V To 24V
Operating Temperature Range
-40°C To +150°C
Base Number
3423
Supply Voltage
RoHS Compliant
Svhc
No SVHC (15-Dec-2010)
Rohs Compliant
Yes
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
620-1207
Features and Benefits
▪ Precisely aligned dual Hall elements
▪ Tightly matched magnetic switchpoints
▪ Speed and direction outputs
▪ Individual Hall element outputs (L package)
▪ Fast power-on time
▪ Output short circuit protection
▪ Operation from an unregulated power supply
▪ Wide operating temperature range
▪ Wide operating voltage range
▪ Integrated EMC-ESD protection
Packages
A3423-DS, Rev. 3
8-pin SOIC (suffix L)
Not to scale
Dual Channel Hall Effect Direction Detection Sensor
VCC
Regulator
4-pin SIP (suffix K)
Power-on
E1
E2
Logic
Functional Block Diagram
Trim
GND
Description
The A3423 is a dual-channel Hall-effect sensor ideal for use in
speed and direction sensing applications incorporating encoder
ring-magnet targets. The A3423 provides various output signals
that indicate speed and direction of target rotation. The Hall
elements are both photolithographically aligned to better than
1 μm. Maintaining accurate displacement between the two
active Hall elements eliminates the major manufacturing hurdle
encountered in fine-pitch detection applications. The sensors
are highly sensitive, temperature-stable magnetic sensors ideal
for use in harsh automotive and industrial environments.
The Hall elements of the A3423 are spaced 1.63 mm apart,
which provides excellent speed and direction information
for small-geometry targets. Extremely low-drift amplifiers
guarantee symmetry between the switches to maintain signal
quadrature. An on-chip regulator allows the use of this device
over a wide operating voltage range of 3.8 to 24 V.
End-of-line trimming of the Hall element switchpoints provides
tight matching capability. The continuous-time nature of the Hall
elements delivers a fast start-up of the sensor and low noise.
The A3423 has integrated protection against transients on
the supply and output pins and short-circuit protection on all
outputs.
The A3423 is available in a 4-pin SIP and a plastic 8-pin
SOIC surface mount package (the SOIC version is currently
in development). Both packages are lead (Pb) free, with 100%
matte tin leadframe plating.
Direction
Logic
L package only
L package only
Current
Current
Current
Current
Output
Output
Output
Output
Limit
Limit
Limit
Limit
OUTA
OUTB
DIR
SPD
A3423

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A3423LK-T Summary of contents

Page 1

Dual Channel Hall Effect Direction Detection Sensor Features and Benefits ▪ Precisely aligned dual Hall elements ▪ Tightly matched magnetic switchpoints ▪ Speed and direction outputs ▪ Individual Hall element outputs (L package) ▪ Fast power-on time ▪ Output short ...

Page 2

... Dual Channel Hall Effect Direction Detection Sensor Selection Guide Part Number Package A3423EK-T 4-pin through hole SIP A3423ELTR-T 8-pin surface mount SOIC A3423LK-T 4-pin through hole SIP A3423LLTR-T 8-pin surface mount SOIC 1 Contact Allegro for additional packing options. 2 SOIC package currently in development. ...

Page 3

A3423 Dual Channel Hall Effect Direction Detection Sensor OPERATING CHARACTERISTICS valid at T Characteristics Electrical Characteristics Supply Voltage Output Leakage Current Undervoltage Lockout Undervoltage Hysteresis Output Rise Time Output Fall Time Supply Current Low Output Voltage Output Current Limit Speed ...

Page 4

A3423 Dual Channel Hall Effect Direction Detection Sensor THERMAL CHARACTERISTICS may require derating at maximum conditions, see application information Characteristic Package Thermal Resistance *Additional thermal information available on Allegro website. Symbol Test Conditions* Package K, 1-layer PCB with copper limited ...

Page 5

A3423 Dual Channel Hall Effect Direction Detection Sensor Supply Current versus Ambient Temperature -50 - (°C) A Saturation Voltage versus Ambient Temperature 400 350 300 250 200 150 100 50 ...

Page 6

A3423 Dual Channel Hall Effect Direction Detection Sensor The integrated circuit contains an internal voltage regulator that powers the Hall sensors and both the analog and digital circuitry. This regulator allows operation over a wide supply voltage range and provides ...

Page 7

A3423 Dual Channel Hall Effect Direction Detection Sensor Operation with Fine-Pitch Ring Magnets circular pitch of less than 4 mm, a performance improvement can be observed by rotating the front face of the sensor subassembly (see below). This sensor rotation ...

Page 8

A3423 Dual Channel Hall Effect Direction Detection Sensor Package K, 4-Pin SIP .205 [5.21] 45° B .0704 1.79 .0642 1.63 B .0520 [1.32] .135 [3.43] E1 .085 [2.16] MAX .580 [14.73] .017 [0.43] .050 [1.27] A ...

Page 9

A3423 Dual Channel Hall Effect Direction Detection Sensor 1.90 0.65 PCB Layout Reference View B Copyright ©2007-2008, Allegro MicroSystems, Inc. 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; ...

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