ATS657 datasheet(3/15 Pages) ALLEGRO

Part #	ATS657

Description	The ATS657 includes an optimized Hall-effect sensing integrated circuit (IC) and rare earth pellet to create a user..

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Manufacturer	ALLEGRO [Allegro MicroSystems]

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Dynamic, Self-Calibrating, Threshold-Detecting, Differential

Speed and Direction Hall-Effect Gear Tooth Sensor IC

ATS657

3

Allegro MicroSystems, Inc.

115 Northeast Cutoff

Worcester, Massachusetts 01615-0036 U.S.A.

1.508.853.5000; www.allegromicro.com

ELECTRICAL CHARACTERISTICS Valid over operating voltage and temperature ranges, unless otherwise noted

Characteristics

Symbol

Test Conditions

Min.

Typ.1

Max.

Unit2

Supply Voltage

VCC

Operating, TJ < TJ(max)

4.0

–

18

V

Undervoltage Lockout

VCC(UV)

VCC = 0 → >4 V, or >4 → 0 V

–

3.5

4.0

V

Reverse Supply Current

IRCC

VCC = –18 V

–

–10

mA

Supply Zener Clamp Voltage

VZ(SUPPLY) ICC = ICC(max) + 3 mA, TA = 25°C

24.0

–

V

Supply Zener Resistance

RZ

–<5

–

Ω

Supply Current

ICC(LOW)

Low-current state (Running mode)

5.0

6.5

8.0

mA

ICC(HIGH)

High-current state (Running mode)

12

14.0

16

mA

ICC(SU)(LOW) Startup current level and Power-On mode

5.0

7.0

8.5

mA

ICC(SU)(HIGH) High-current state (Calibration)

12

14.5

16.5

mA

Current Level Difference

∆ICC

ICC(HIGH) – ICC(LOW)

5–

–mA

Power-On Characteristics3

Power-On Time

ton

Speed < 200 Hz

–

2.0

ms

Initial Calibration

First Output Pulse with Direction4

NDIR

Speed < 200 Hz, constant rotation direction

–

6

Edge

First Output Pulse5

NNONDIR

Speed < 200 Hz, constant rotation direction

–

2

Edge

AGC Disable

Nf

Speed < 200 Hz, constant rotation direction

–

5

Edge

Vibration Check

NVIBCHECK Speed < 200 Hz, after AGC disable

–

3

–

Edge

Time Until Correct Direction Output on

High-Speed Startup

tHIGHSU

10 kHz startup, B = 300 Gpk-pk

–5

–

ms

Running Mode Calibration6

Non-Direction Pulse Output on Direction

Change

NNONDIR_DC Running mode, direction change

–

1

2

Pulse

First Direction Pulse Output on Direction

Change

NDC

Running mode, direction change

–

2

3

Pulse

DAC Characteristics

Allowable User-Induced Differential

Offset7

BDIFFEXT

Both differential channels

–

±60

–

G

Output Stage

Output Slew Rate

SROUT

RL = 100 Ω, CL = 10 pF; ICC(HIGH) → ICC(LOW),

ICC(LOW) → ICC(HIGH), 10% to 90% points

7

16.0

–

mA/μs

1Typical data is at VCC = 8 V and TA = +25°C, unless otherwise noted. Performance may vary for individual units, within the specified maximum and

minimum limits.

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

3Power-On Time is the time required to complete the initial internal automatic offset adjust; the DACs are then ready for peak acquisition.

4Direction of the first output pulse on the 6th edge may not be correct when undergoing vibration.

5Non-direction pulse output only. See figure 3 for more details.

6Direction pulse will typically occur on the 2nd output pulse after a direction change. This will hold true unless an offset change at zero speed results in

an offset correction event. Note that no output blanking occurs after a direction change.

7The device will compensate for magnetic and installation offsets up to ±60 G. Offsets greater than ±60 G may cause inaccuracies in the output.

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