ALLEGRO ATS635LSE User Manual

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ATS635LSE and ATS636LSE

PACKAGE DIAGRAM

Pin 1 = VCC Pin2=VOUT Pin3=NoConnect Pin 4 = GND

ABSOLUTE MAXIMUM RATINGS

Supply Voltage, VCC………………….…….. 28 V* Reverse Supply Voltage, V Overvoltage Supply Current, I Output Off Voltage, V Output Sink Current, I

OUT……

OUT

Magnetic Flux Density, B…………… Unlimited Package Power Dissipation, P Operating Temperature Range, T

Suffix “L”………...……….. -40°Cto+150°C

Junction Temperature, T Storage Temperature Range

………………………… -65°Cto+170°C

…………… -18 V

RCC

…..……100 mA

……………… 26.5V

…...…………. 20 mA

….. See Graph

……..…………..165 °C

†

Programmable Back Biased Hall-Effect

Switch with TPOS Functionality

The ATS635LSE and ATS636LSE programmable, true power-on state (TPOS), sensors are an optimized Hall-effect IC and magnet combination that switch in response to magnetic signals created by ferrous targets in gear-tooth sensing and proximity applications.

The devices are externally programmable. A wide range of programmability is available on the magnetic operate point (B hysteresis remains fixed. This advanced feature allows for optimization of the sensor switch point and can drastically reduce the effects of mechanical placement tolerances found in production environments .

A proprietary dynamic offset cancellation technique, with an internal high-frequency clock, reduces the residual offset voltage, which is normally caused by device overmolding, temperature dependencies, and thermal stress. Having the Hall element and amplifier in a single chip minimizes many problems normally associated with low-level analog signals.

This sensor system is ideal for use in gathering speed or position information using gear-tooth-based configurations, or for proximity sensing with ferrous targets.

The ATS635LSE switches HIGH in the presence of a ferrous target or tooth and switches LOW in the presence of a target valley, window, or when the ferrous target is removed. The ATS636LSE has the opposite polarity and switches LOW in the presence of a ferrous target or tooth and switches HIGH in the presence of a target valley, window, or when the ferrous target is removed.

These devices are available in lead (Pb) free versions, with 100% matte tin leadframe plating.

FEATURES

 Chopper Stabilization

 Extremely low switch-point drift over temperature

 On-chip Protection

 Supply transient protection  Output short-circuit protection  Reverse-battery protection

 True Zero-Speed Operation  True Power-On State  Single-chip Sensing IC for High Reliability  Optimized Magnetic Circuit  Wide Operating Voltage Range  Internal Regulator

Use the following complete part numbers when ordering:

) while the

*Fault conditions that produce supply voltage transients will be clamped by an internal Zener diode. These conditions can be tolerated but should be avoided.

†

Internal current limiting is intended to protect the device from output short circuits, but is not intended for continuous operation.

ATS635LSE-DS

Part Number Pb-Free Output

Packing*

(Tooth)

ATS635LSETN-T Yes High 13-in. reel, 450 pieces/reel

ATS636LSETN-T Yes Low 13-in. reel, 450 pieces/reel

*Contact Allegro for additional packing options.

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

www.allegromicro.com

ATS635LSE and ATS636LSE

PROGRAMMABLE TRUE POWER-ON HALL-EFFECT GEAR-TOOTH SWITCHES

CHARACTERISTICS

ELECTRICAL CHARACTERISTICS over operating voltage and junction temperature range (unless otherwise noted)

Characteristics Symbol Test Conditions

Limits

Min. Typ. Max. Units

Supply Voltage1 VCC Operating 4.2 – 24 V

After programming

Power-Up State POS

= 0 à V

B < BOP ATS636

CC(min)

, t > t

HIGH HIGH HIGH –

B < BOP ATS635 LOW LOW LOW –

Low Output Voltage V

Output Current Limit2 I

Output Leakage Current I

OUT(SAT)

Output on, I

OUTM

Output off, V

OFF

Pulse test method

= 20 mA – 175 400 mV

OUT

Output on

OUT

30 50 90 mA

= 24 V – – 10 µA

Output off (HIGH) – 2.5 5.5 mA

Supply Current I

Output on (LOW) – 2.5 5.5 mA

Reverse Supply Current I

Power-On Delay3 tON Output off; VCC > V

RCC

= -18V – – -5 mA

RCC

– 35 50 µs

CC(min)

Output Rise Time tr RL = 820 Ω, CL = 10 pF – 1.2 5 µs

Output Fall Time tf RL = 820 Ω, CL = 10 pF – 1.2 5 µs

Sampling Frequency f

Supply Zener Voltage V

Output Zener Voltage V

Supply Zener Current4 I

Output Zener Current I

- – 250 - kHz

Sample

Zsupply

ZOutput

VS = 28 V – –

Zsupply

VO = 30 V – –

ZOutput

ICC = I

+ 3 mA

CC(max)

TA = 25°C

= 3 mA

OUT

TA = 25°C

28 – – V

30 – – V

8.5 mA

Note: Typical data is at VCC = 12 V and TA = +25°C.

Do not exceed the maximum thermal junction temperature: see power de-rating curve.

Short circuit protection is not intended for continuous operation and is tested using pulses.

The power on delay is the time that is necessary before the output signal is valid

The maximum spec limit for this parameter is equivalent to I

CC(max)

+ 3 mA

Page 2 of 15

ATS635LSE and ATS636LSE

PROGRAMMABLE TRUE POWER-ON HALL-EFFECT GEAR-TOOTH SWITCHES

MAGNETIC CHARACTERISTICS over operating voltage and junction temperature range using reference target (Unless otherwise noted)

Limits

Characteristics Symbol Test Conditions

Switch Point – 7 – Bit Number of Programming Bits

Switch Point Polarity – 1 – Bit

Programming Lock – 1 – Bit

Gear Tooth Sensor / Proximity Sensing Characteristi cs (Low Switchpoint Only)

Programming Air Gap

Range

Programming Resolution

Air Gap Drift Over Full

Temperature Range

Range

Res

Drift

Temp: 25°C Code –127

Temp: 25°C Code +127

Temperature: 25°C

Program Air Gap = 2.5 mm

Device Programmed

to 2.5 mm

Over Tooth (ATS635LSE) – HIGH – –

Over Valley (ATS635LSE) – LOW – –

Polarity P

Over Tooth (ATS636LSE) – LOW – –

Over Valley (ATS636LSE) – HIGH – –

1400

1200

1000

800

600

400

Flux Density (Gauss)

200

0 30 60 90 120 150 180 210 240 270 300 330 360

Reference Target Flux Density vs. Position: Typical

Reference Target Flux Density vs. Position

Position (º)

0.25

0.50

0.75

1.00

1.25

1.50

1.75

2.00

2.25

2.50

2.75

3.00

3.25

3.50

3.75

4.00

4.25

4.50

4.75

5.00

5.25

5.50

5.75

6.00

1400

1200

1000

800

600

400

Flux Density [Gauss]

200

0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0

Reference Target Tooth and Valley Field vs. Air Gap

Min. Typ. Max. Units

2.5 – – mm

– – 1.5 mm

– 0.05 – mm

– 0.2 – mm

Tooth and Valley Field vs. Air Gap

Reference Target

Reference Target Tooth

Reference Target Valley

Air Gap [mm]

The switch point will vary over temperature. A sufficient margin obtained through customer testing is required to guarantee functionality over temperature. Programming at larger air gaps leaves no safety margin for switchpoint drift. See the applications note: “Proximity Sensing Programming Technique” http://www.allegromicro.com/techpub2/proximity_sensing/ or visit the Allegro website at http://www.allegromicro.com for additional information.

The switch point will vary over temperature, proportionally to the programmed air gap. This parameter is based on characterization data and is not a tested parameter in production. Switch point air gap generally drifts downward as temperature increases.

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

ATS635LSE and ATS636LSE

PROGRAMMABLE TRUE POWER-ON HALL-EFFECT GEAR-TOOTH SWITCHES

REFERENCE TARGET DIMENSIONS

Outside

Target

Reference Target 120mm 6mm 23.5mm 23.5mm 5mm

Diameter

(Do)

Face Width

(F)

Reference Target

GEAR PARAMETERS FOR CORRECT OPERATION

Characteristic Description

Tooth Whole Depth (ht) Depth of Target Valley 5 – – mm Circular Valley Length (PC – T) Length of Target Valley 13 – – mm Circular Tooth Length (T) Length of Target Tooth 5 – – mm Face Width (F) Thickness or Width of Target Tooth 5 – – mm

MATERIAL: CRS 1018

Circular Tooth

Length

(T)

Circular Valley

Length

(PC – T)

Limits

Min. Typ. Max. Units

Tooth Whole

Depth

(ht)

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

ATS635LSE and ATS636LSE

PROGRAMMABLE TRUE POWER-ON HALL-EFFECT GEAR-TOOTH SWITCHES

ELECTROMAGNETC CAPABILITY (EMC) PERFORMANCE

Please contact Allegro MicroSystems for EMC performance

Test Name Reference Specification

ESD – Human Body Model AEC-Q100-002 ESD – Machine Model AEC-Q100-003 Conducted Transients ISO 7637-1

Direct RF Injection ISO 11452-7

Bulk Current Injection ISO 11452-4 TEM Cell ISO 11452-3

Clock/Logic

FUNCTIONAL BLOCK DIAGRAM

Program / Lock

Programmming

Logic

AMP S/H LPF

Offset Adjust

Reg

Current

Limit

VCC

To all subcircuits

OUT

GND

+ 10 hidden pages

ALLEGRO ATS635LSE User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual