A3422EKA-T(2009) Просмотр технического описания (PDF) - Allegro MicroSystems

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A3422EKA-T
(Rev.:2009)

Hall Effect Direction Detection Sensor IC

Allegro MicroSystems 

3422

HALL-EFFECT,

DIRECTION-DETECTION SENSOR IC

Pinning is shown viewed from branded side.

ABSOLUTE MAXIMUM RATINGS

Supply Voltage, VCC . . . . . . . . . . . . . . . 18 V

Magnetic Flux Density, B . . . . . Unlimited

Output OFF Voltage, VOUT . . . . . . . . . VCC

Output Sink Current, IOUT . . . . . . . . 30 mA

Package Power Dissipation,

PD . . . . . . . . . . . . . . . . . . . . . 500 mW

Operating Temperature Range, TA

Suffix ‘E–’ . . . . . . . . . . -40°C to +85°C

Suffix ‘L–’ . . . . . . . . . -40°C to +150°C

Storage Temperature Range,

TS . . . . . . . . . . . . . . . -65°C to +170°C

The A3422xKA Hall-effect, direction-detection sensor IC is a new

generation of special-function integrated devices that is applicable to sens-

ing the direction of rotation of a ring magnet. This transducer provides

separate digital outputs that provide information on magnet rotation

speed, direction, and magnet pole count. This device eliminates the ma-

jor manufacturing hurdles encountered in fine-pitch direction-detection

applications, namely maintaining accurate mechanical location between

the two active Hall elements. Here, the two Hall elements are photo-

lithographically aligned to better than 1 μm, as contrasted with 100 μm

or worse mechanical location tolerance when manufactured discretely.

This highly sensitive, temperature-stable, magnetic transducer is ideal

for use in digital-encoder systems in the harsh environments of auto-

motive or industrial applications. The A3422xKA is a high-sensitivity

device optimized for use with high-density magnets.

The A3422xKA monolithic integrated circuit contains two inde-

pendent Hall-effect bipolar switches whose digital outputs are internally

coupled to CMOS logic circuitry that decodes signal speed and direc-

tion. Extremely low-drift BiCMOS circuitry is used for the amplifiers

to ensure symmetry between the two switches so that signal quadrature

can be maintained. An on-chip voltage regulator allows the use of this

device from a 4.5 V to 18 V supply. The outputs are standard open-col-

lector outputs.

Two operating temperature ranges are provided; suffix ‘E–’ is for

the automotive and industrial temperature range of -40°C to +85°C, suf-

fix ‘L–’ is for the automotive and military temperature range of

-40°C to +150°C. The 5-pin ‘KA’ SIP package provides a cost-com-

petitive solution to magnetic sensing in harsh environments.

FEATURES

• Internal Direction-Decoding Circuitry

• Two Matched Hall Bipolar Switches on a Single Substrate

• Superior Temperature Stability

• 4.5 V to 18 V Operation

Electrically Defined Power-On State

Undervoltage Lockout

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