ATS673 datasheet(4/19 Pages) ALLEGRO

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Self-Calibrating TPOS Gear Tooth Sensor Optimized

for Automotive Cam Sensing Applications

ATS673 and

ATS674

Allegro MicroSystems, Inc.

115 Northeast Cutoff, Box 15036

Worcester, Massachusetts 01615-0036 (508) 853-5000

www.allegromicro.com

SWITCHPOINT CHARACTERISTICS

Tooth Speed

Tooth frequency, target generating sinusoidal signal

–

kHz

Bandwidth

Corresponds to output switching frequency – 3 dB

–

kHz

Operate

BOP

ATS673 % of peak-to-peak, referenced to tooth signal,

AG < AG(Max)

–40–

ATS674

–

Release

BRP

ATS673 % of peak-to-peak, referenced to tooth signal,

AG < AG(Max)

–50–

ATS674

–

CALIBRATION CHARACTERISTICS4

Initial Calibration

CalIC

Quantity of rising edges required to complete edge detec-

tion calibration

–

edges

AGC Disable

CalAGC

Quantity of rising edges required to complete Automatic

Gain Control calibration

–

edges

Calibration Update

CalUPD

Quantity of rising edges required to update edge detection

calibration while running after initial calibration

–

Contin-

uous

–

edges

PERFORMANCE CHARACTERISTICS3

TPOS Air Gap Range5

AGTPOS

TPOS functionality guaranteed

0.5

–

2.5

Operational Air Gap Range

TPOS guaranteed, output switching, running mode

0.5

–

2.5

Extended Minimum Air Gap6

AGEXTMIN

Output switching, running mode; valleys may be detected

as teeth in this range

–

0.5

Extended Maximum Air Gap7

AGEXTMAX

Output switching, running mode; teeth may be detected as

valleys in this range

2.5

–

Relative Timing Accuracy4,8

ErrICREL

ATS673 During initial calibration; rising or falling edges,

gear speed = 1000 rpm, target eccentricity

< 0.1 mm

–36

deg

ATS674

–

deg

ErrRELR

ATS673 Rising edges; after initial calibration, gear speed

= 1000 rpm, target eccentricity < 0.1 mm

–

0.5

0.8

deg

ATS674

–

0.4

0.8

deg

ErrRELF

ATS673 Falling edges; after initial calibration, gear speed

= 1000 rpm, target eccentricity < 0.1 mm

–

0.8

1.2

deg

ATS674

–

0.6

1.2

deg

Phase Delay9

ΔErrSREL After initial calibration, AG=1.5 mm, TA = 25°C

–

1.6 x 10–4

–

deg/rpm

1Typical values are taken at VCC = 12 V and TA = 25°C.

2IZSupply(Max) is equivalent to ICCON(Max) + 3 mA.

3Using reference target 8X.

4The term edge refers to a mechanical edge, such as the side of a gear tooth, passing under the device. Rising edge: from valley to approaching tooth.

Falling edge: from tooth to approaching valley.

5The TPOS Air Gap Range is the range of installation air gaps within which the TPOS (True Power-On State) function is guaranteed to correctly detect

a tooth when powered-on over a tooth and correctly detecting a valley when powered-on over a valley, using reference target 8X or equivalent, as

specified in the Target/Gear Parameters for Correct TPOS Operation section in this document.

6The Extended Minimum Air Gap is a range of installation air gaps, smaller than AG(Min), within which the the device will accurately detect target fea-

tures but TPOS is NOT guaranteed to be fully accurate, possibly evaluating the initial valley as a tooth.

7The Extended Maximum Air Gap is an extended range of installation air gaps, greater than AG(Max), within which the the device will accurately detect

target features but TPOS is not guaranteed to be fully accurate, possibly evaluating the intiial tooth as a valley.

8Relative Timing Accuracy is the change in edge position before the resulting change in device output; for a single device, over the full Operational Air

Gap Range, AG, and Operating Ambient Temperature, TA, range.

9Phase Delay is the change in edge position at detection, through the full operational Tooth Speed, S, range for a single device, and at a single ambi-

ent temperature, TA, and installation air gap, AG.

OPERATING CHARACTERISTICS, continued Valid at TA = –40°C to 150°C, TJ ≤TJ(max), over full range of AG, unless otherwise noted

Characteristic

Symbol

Test Conditions

Min.

Typ.1

Max.

Units

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