ALLEGRO ATS673 User Manual

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Self-Calibrating TPOS Gear Tooth Sensor Optimized for

Package SE, 4-pin Through Hole

ATS673 and ATS674

Automotive Cam Sensing Applications

Recognizing the increasingly stringent requirements for EMC/EMI in automotive applications, Allegro has taken the necessary steps to design devices that are capable of withstanding the effects of radiated and conducted transients. The ATS673 and ATS674 devices have been designed specifically for this purpose. Advanced circuitry on the die allows them to survive positive and negative transient pulses on both the input and output.

The ATS673 and ATS674 devices retain all of the same characteristics as the ATS671 and ATS672. The devices remain true zero-speed gear tooth sensors with optimized Hall IC/magnet configuration in an SIP (single in-line package). The SIP assembly consists of a molded package that holds together a samarium cobalt magnet, a pole piece, and a true zero-speed Hall IC that has been optimized to the magnetic circuit.

1. VCC

2. VOUT

3. TEST

4. GND

AB SO LUTE MAX I MUM RAT INGS

Supply Voltage, VCC...........................................28 V

Reverse-Supply Voltage, V Continuous Output Current, I Reverse-Output Current, I Operating Temperature Ambient, T Maximum Junction, T Storage Temperature, T

, Range L................–40ºC to 150ºC

........................–18 V

RCC

...................20 mA

OUT

.......................50 mA

ROUT

........................165ºC

J(max)

.................. –65ºC to 170ºC

The sensor incorporates a single element Hall IC that switches in response to magnetic signals created by a ferrous target. The IC contains a sophisticated digital circuit designed to eliminate the detrimental effects of magnet and system offsets. Signal processing is used to provide zero-speed performance independent of air gap and also to dynamically adapt device performance to the typical operating conditions found in automotive applications, particularly cam sensing applications (reduced vibration sensitivity).

High-resolution (9-bit) peak detecting DACs are used to set the adaptive switching thresholds of the devices, ensuring high accuracy even in the presence of gear eccentricity. Hysteresis in the thresholds reduces the negative effects of anomalies in the magnetic signal (such as magnetic overshoot) associated with the targets used in many automotive applications. The ATS673 and 674 also include a low bandwidth filter that increases the noise immunity and the signal to noise ratio of the sensor.

Two options are available for output polarity, low over tooth (LT) and high over tooth (HT). For applications requiring absolute accuracy use the ATS674. The ATS673 should be used for targets with high wobble.

Features and Benefits

Tight timing accuracy over operating temperature range True zero-speed operation TPOS (True Power-On State) Air-gap-independent switchpoints High immunity to vibration Large operating air gaps Operation with supply voltages down to 3.3 V Digital output representing target profile Single-chip solution for high reliability Optimized Hall IC/magnet system AGC and reference adjust circuit Undervoltage lockout

ATS673LSE-DS

Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000

www.allegromicro.com

ATS673 and ATS674

Self-Calibrating TPOS Gear Tooth Sensor Optimized for Automotive Cam Sensing Applications

Product Selection Guide

Part Number Pb-free V

ATS673LSETN-LT-T Yes

ATS673LSETN-LT –

ATS673LSETN-HT-T Yes

ATS673LSETN-HT –

ATS674LSETN-LT-T Yes

ATS674LSETN-LT –

ATS674LSETN-HT-T Yes

ATS674LSETN-HT –

Contact Allegro for additional packing options.

(Over Tooth) Application Packing*

OUT

Low

High

Low

High

High target wobble

13-in. reel, 450

pieces/reel

High absolute edge

detection accuracy

ATS673LSE-DS

Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000

www.allegromicro.com

ATS673 and ATS674

Self-Calibrating TPOS Gear Tooth Sensor Optimized for Automotive Cam Sensing Applications

Functional Block Diagram

V+

VCC

0.1 µF C

BYPASS

Hall

Amp

Voltage

Regulator

(Analog)

Offset Adjust Temperature

Coefficient

Adjust

Offset TC

REG(A)

Voltage

Regulator

(Digital)

LPF

REG(D)

Automatic

Gain

Control

REF

Comp_P

Comp_N

Continuous

Update Logic

Continuous

Update Logic

PROC

Clock

Output State

Clock

Output State

9-Bit

PDAC

9-Bit

Counter

9-Bit

Counter

9-Bit

NDAC

Threshold

Output

ATS673LSE-DS

GND

TPOS

TPOS Trim

(Recommended)

REG(A)

Power-On

Reset

TEST

REG(D)

Output

Driver

Threshold

Comparator

Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000

www.allegromicro.com

VOUT

ATS673 and ATS674

Self-Calibrating TPOS Gear Tooth Sensor Optimized for Automotive Cam Sensing Applications

OPERATING CHARACTERISTICS Valid at T

= –40°C to 150°C, TJ ≤ T

, over full range of AG, unless otherwise noted

J(max)

Characteristic Symbol Test Conditions Min. Typ.

ELECTRICAL CHARACTERISTICS

Supply Voltage V

Undervoltage Lockout V

Supply Zener Clamp Voltage V

Supply Zener Current

ZSupplyICC

ZSupply

Supply Current I

Reverse Supply Current I

POWER-ON CHARACTERISTICS

Power-On Time

OUTPUT CHARACTERISTICS

Low Output Voltage V

OUT(Sat)ISINK

Output Zener Voltage V

Output Current Limit I

Output Leakage Current I

OUTLIM

OUTOFF

Output Rise Time t

Output Fall Time t

Output Polarity V

CCUV

RCC

ZOUTIOUT

OUT

Operating; TJ < T

= I

CC(Max)

= 27 V – – 14 mA

Supply

J(Max)

+ 3 mA, TA = 25°C 28 31 35 V

Output = OFF or ON 3 6.5 11 mA

= –18 V – –5 –10 mA

RCC

Gear Speed < 100 rpm; V

> V

CC(Min)

= 15 mA, Output = ON – 200 450 mV

= 3 mA, TA = 25°C 30 – – V

Output = ON, V

Output = OFF, V

10/90% points; R

HT device option

LT device option

= 12 V 35 57 90 mA

OUT

= V

OUT

CC(Max)

= 500 Ω, C

LOAD

= 500 Ω, C

LOAD

= 10 pF, TA = 25°C – 0.9 5 µs

LOAD

= 10 pF, TA = 25°C – 0.5 5 µs

LOAD

Over tooth – HIGH – V

Over valley – LOW – V

Over tooth – LOW – V

Over valley – HIGH – V

Max. Units

3.3 – 26.5 V

––<V

CC(Min)

– – 500 µs

––10µA

Continued on the next page...

OUT(High)

OUT(Low)

ATS673LSE-DS

V+ %

Output Rise and Fall Time

100

Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000

www.allegromicro.com

ATS673 and ATS674

Self-Calibrating TPOS Gear Tooth Sensor Optimized for Automotive Cam Sensing Applications

OPERATING CHARACTERISTICS, continued Valid at T

Characteristic Symbol Test Conditions Min. Typ.

= –40°C to 150°C, TJ ≤ T

, over full range of AG, unless otherwise noted

J(max)

Max. Units

SWITCHPOINT CHARACTERISTICS

Tooth Speed S Tooth frequency, target generating sinusoidal signal 0 – 8 kHz

Bandwidth BW Corresponds to output switching frequency – 3 dB – 40 – kHz

Operate B

Release B

CALIBRATION CHARACTERISTICS

Initial Calibration Cal

AGC Disable Cal

Calibration Update Cal

PERFORMANCE CHARACTERISTICS

TPOS Air Gap Range

ATS673

ATS674 – 30 – %

ATS673

ATS674 – 40 – %

Quantity of rising edges required to complete edge detec-

tion calibration

Quantity of rising edges required to complete Automatic

AGC

Gain Control calibration

Quantity of rising edges required to update edge detection

UPD

calibration while running after initial calibration

TPOS functionality guaranteed 0.5 – 2.5 mm

TPOS

% of peak-to-peak, referenced to tooth signal, AG < AG

(Max)

% of peak-to-peak, referenced to tooth signal, AG < AG

(Max)

–40– %

–50– %

– – 3 edges

Contin-

–

uous

– edges

Operational Air Gap Range AG TPOS guaranteed, output switching, running mode 0.5 – 2.5 mm

Extended Minimum Air Gap

Extended Maximum Air Gap

EXTMIN

EXTMAX

Err

Relative Timing Accuracy

4,8

Err

Phase Delay

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

ZSupply(Max)

Using reference target 8X.

The 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.

The 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

is equivalent to I

∆Err

CCON(Max)

+ 3 mA.

Output switching, running mode; valleys may be detected as teeth in this range

Output switching, running mode; teeth may be detected as valleys in this range

ATS673

ICREL

ATS674 – 3 6 deg

ATS673

RELR

ATS674 – 0.4 0.8 deg

ATS673

RELF

ATS674 – 0.6 1.2 deg

After initial calibration, AG = 1.5 mm, TA = 25°C – 1.6 x 10

SREL

During initial calibration; rising or falling edges, gear speed = 1000 rpm, target eccentricity < 0.1 mm

Rising edges; after initial calibration, gear speed = 1000 rpm, target eccentricity < 0.1 mm

Falling edges; after initial calibration, gear speed = 1000 rpm, target eccentricity < 0.1 mm

– – 0.5 mm

2.5 – 5 mm

– 3 6 deg

– 0.5 0.8 deg

– 0.8 1.2 deg

–4

– deg/rpm

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.

The Extended Minimum Air Gap is a range of installation air gaps, smaller than AG

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

The Extended Maximum Air Gap is an extended range of installation air gaps, greater than AG

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

Relative 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.

Phase 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-

, within which the the device will accurately detect target fea-

(Min)

, within which the the device will accurately detect

(Max)

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

ATS673LSE-DS

Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000

www.allegromicro.com

ATS673 and ATS674

Self-Calibrating TPOS Gear Tooth Sensor Optimized for Automotive Cam Sensing Applications

Air Gap Comparisons

Target (Gear)

Installation Air Gap

Branded Face

Target Mechanical Profile

Sensor Device

Relative Timing Accuracy

Extended Maximum Air Gap, AG

Operational Air Gap Range, AG

TPOS Air Gap Range, AG

EXTMAX

TPOS

Extended Minimum Air Gap Air Gap, AG

EXTMIN

ATS673LSE-DS

Sensor Output Electrical Profile

-HT Option

V+

OUT

Err

RELR(Max – Min)

Err

RELF(Max – Min)

Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000

www.allegromicro.com

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