A1667 datasheet(4/15 Pages) ALLEGRO

Part #	A1667

Description	True Zero-Speed, High Accuracy, Ring Magnet Sensor IC

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Manufacturer	ALLEGRO [Allegro MicroSystems]

Direct Link	http://www.allegromicro.com

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True Zero-Speed, High Accuracy, Ring Magnet Sensor IC

A1667

4

Allegro MicroSystems, LLC

955 Perimeter Road

Manchester, NH 03103-3353 U.S.A.

www.allegromicro.com

OPERATING CHARACTERISTICS (continued): Valid over operating voltage and temperature ranges, unless otherwise noted

Characteristics

Symbol

Test Conditions

Min.

Typ. [1]

Max.

Unit

CALIBRATION

Initial Calibration[6]

CALI

Possible reduced edge detection accuracy, duty

cycle not guaranteed

–

1

6

electrical

edge

Update Method

Running mode operation, bounded for

decreasing BSIG, unlimited for increasing BSIG

–

Continuous

–

OPERATING CHARACTERISTICS

Operating Signal Range

BSIG

Differential magnetic signal

operation within specification

30

–

1400

G

Relative Repeatability[7]

TθE

60 pole-pair target, using 100 GPK-PK ideal

sinusoidal signal, TA = 150°C, and fOP = 1000 Hz

–

0.12

–

degrees

Maximum Single Outward Sudden Air

Gap Change[8]

∆

AGMAX

Single instantaneous air gap peak-to-peak

amplitude change, fOP<500 Hz, VPROC(pk-pk) >

VLOE after sudden AG change

–

40

–

%PK-PK

[1]

Typical data is at VCC = 12 V and TA = 25°C, unless otherwise noted. Performance may vary for individual units, within the specified maximum and

minimum limits.

[2]

Sustained voltages beyond the clamp voltage may cause permanent damage to the IC.

[3]

Power-On Time is the time required to complete the internal Automatic Offset Adjust; the DACs are then ready for peak acquisition.

[4]

The device compensates for magnetic and installation offsets. Offsets greater than specification in gauss may cause inaccuracies in the output.

[5]

1 G (gauss) = 0.1 mT (millitesla).

[6]

For power-on frequency, fOP < 200 Hz. Higher power-on frequencies may result in more input magnetic cycles until full output edge accuracy is

achieved, including the possibility of missed output edges.

[7]

The repeatability specification is based on statistical evaluation of a sample population, evaluated at 1000 Hz.

[8]

Single maximum allowable air gap change in outward direction (increase in air gap).

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