Datasheet A3150JUA, A3150JLT Datasheet (Allegro)

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Page 1

Data Sheet

27621.40

3150

PROGRAMMABLE, CHOPPER-

STABILIZED, HALL-EFFECT SWITCH

The A3150JLT and A3150JUA programmable switches provide tooth/valley recognition in large gear-tooth sensing applications. Each sensor consists of a single element, chopper-stabilized Hall-effect IC

PTCT

that can be programmed to the desired magnetic switch point, optimizing sensor airgap and timing accuracy performance after final packaging. The small package can be easily assembled and used in conjunction with a wide variety of gear/target shapes and sizes. The two devices differ only in package style.

The sensing technology used for this sensor is Hall-effect based. The sensor incorporates a single-element Hall IC that switches in response to magnetic signals created by a ferrous target. The programmability of the circuit eliminates magnet and system offsets such as those caused by tilt yet provides zero-speed detection capabilities without the associated running jitter inherent in classical digital solutions.

A proprietary dynamic offset cancelation technique, with an

SUPPLY

GROUND

Dwg. PH-003-2

PRELIMINARY INFORMATION

(subject to change without notice)

April 12, 1999

ABSOLUTE MAXIMUM RATINGS

at T

= 25°C

Supply Voltage, VCC........................... 26.5 V

Reverse Supply Voltage, V

Overvoltage Supply Current, ICC..... 100 mA

Magnetic Flux Density, B ............ Unlimited

DISCONTINUED PRODUCT

Output Current, I Output OFF Voltage, V Reverse Output Current, I Operating Temperature Range,

TA............................... -40°C to +115°C

Storage Temperature, TS................... +170°C

— FOR REFERENCE ONLY.

..... Internally Limited

OUT

Use A3250 for new design

OUTPUT

............ -30 V

RCC

................. 26.5 V

......... -50 mA

ROUT

internal high-frequency clock, reduces the residual offset voltage, which is normally caused by device overmolding, temperature dependancies, and thermal stress. This technique produces devices that have an extremely stable quiescent output voltage, are immune to mechanical stress, and have precise recoverability after temperature cycling. Many problems normally associated with low-level analog signals are minimized by having the Hall element and amplifier in a single chip. Output precision is obtained by internal gain adjustments during the manufacturing process and operate-point programming in the user’s application.

This sensor system is ideal for use in gathering speed, position, and timing information using gear-tooth-based configurations. The A3150JLT/JUA are particularly suited to those applications that require accurate duty cycle control or accurate edge detection. The lower vibration sensitivity also makes these devices extremely useful for transmission speed sensing.

Continued next page

Always order by complete part number: the prefix 'A' + the basic four-digit part number + a suffix to indicate operating temperature range + a suffix to indicate package style, e.g., A3150JLT .

Page 2

3150

PROGRAMMABLE, CHOPPERSTABILIZED, PRECISION, HALL-EFFECT SWITCH

FUNCTIONAL BLOCK DIAGRAM

PROGRAM

LOGIC

REG.

SUPPLY

& HOLD

DYNAMIC

OFFSET CANCELLATION

SAMPLE

Two package styles provide a magnetically optimized package for most applications. Suffix ‘–LT’ is a miniature SOT-89/TO-243AA transistor package for surface-mount applications; while suffix ‘–UA’ is a three-lead ultra-mini-SIP for through-hole mounting.

FEATURES AND BENEFITS

FILTER

LOW-PASS

OFFSET ADJUST

POWER-UP

CONTROL

CURRENT

LIMIT

<1Ω

OUTPUT

GROUND

Dwg. FH-020-3

■ Chopper Stabilized for

Extremely Low Switch-Point Drift and

Immunity to Mechanical Stress

■ Externally Programmed Switch Point

■ On-Chip Supply-Transient Protection

■ Output Short-Circuit Protection

■ Single-Chip Sensing IC for High Reliability

■ Small Mechanical Size

■ <50 µs Power-On Time

■ Wide Operating Voltage Range

■ Defined Power-On State

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3150

PROGRAMMABLE, CHOPPER-

STABILIZED, PRECISION,

HALL-EFFECT SWITCH

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

Limits

Characteristic Symbol Test Conditions Min. Typ. Max. Units

Supply Voltage V

Power-On State POS After programming, V

Low Output Voltage V

Output Current Limit I

Output Leakage Current I

Supply Current I

OUT(SAT)

OUTM

OFF

Operating, T

= 20 mA – 175 400 mV

OUT

= 12 V 65 80 95 mA

OUT

= 24 V – 0.2 10 µA

OUT

< 165°C 4.25 – 26 V

= 0 → 5 V HIGH HIGH HIGH –

Before programming, output OFF – 4.0 7.0 mA

Before programming, output ON – 5.0 8.0 mA

Reverse Supply Current I

Power-On Delay t

Output Rise Time t

Output Fall Time t

Clock Frequency f

Zener Voltage V

Zener Impedance z

RCC

= -30 V – – -5.0 mA

RCC

> 5 V – 20 50 µs

= 820 Ω, C

= 100 µA, TA = 25°C2732–V

IZT = 10 mA, T

= 20 pF – 200 – ns

= 20 pF – 100 – ns

= 25°C – 50 100 Ω

NOTE: Typical data is at VCC = 5 V and TA = +25°C and is for design information only.

– 340 – kHz

MAGNETIC CHARACTERISTICS over operating supply voltage and temperature ranges.

Limits

Characteristic Symbol Test Conditions Min. Typ. Max. Units

Operate Point B

Hysteresis B

∆B

hys

NOTE: Typical data is at VCC = 5 V and TA = +25°C and is for design information only.

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Programmable offset range 500 670 850 G

Initial (before programming) 0 20 40 G

Resolution 8.0 11 14 G

VCC = 14 V, after programming, B

≈ 500 G

-35 8.0 +35 G

5.0 20 35 G

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3150

PROGRAMMABLE, CHOPPERSTABILIZED, PRECISION, HALL-EFFECT SWITCH

TYPICAL ELECTRICAL CHARACTERISTICS

5.0

4.0

3.0

2.0

SUPPLY CURRENT IN mA

1.0

-50

B > B

0 25 50 75

AMBIENT TEMPERATURE IN °C

300

T = +25°C

V = 5 V

100

125-25

150

Dwg. GH-053-2

B < B

8.0

6.0

4.0

SUPPLY CURRENT IN mA

2.0

SUPPLY VOLTAGE IN VOLTS

B > B

B < B

10 15 20 25

Dwg. GH-041-2

I = 20 mA

OUT

V = 4.5–24 V

200

100

SATURATION VOLTAGE IN mV

-50

-25

0 25 50 75

AMBIENT TEMPERATURE IN °C

100

150

125

Dwg. GH-040-4

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

Page 5

PROGRAMMABLE, CHOPPER-

STABILIZED, PRECISION,

FUNCTIONAL DESCRIPTION

3150

HALL-EFFECT SWITCH

Chopper-Stabilized Technique. These devices use a proprietary dynamic offset cancellation technique, with an internal high-frequency clock to reduce the residual offset voltage of the Hall element that is normally caused by device overmolding, temperature dependencies, and thermal stress. This technique produces devices that have an extremely stable quiescent Hall output voltage, are immune to thermal stress, and have precise recoverability after temperature cycling. This technique will also slightly degrade the device output repeatability.

The Hall element can be considered as a resistor array similar to a Wheatstone bridge. A large portion of the offset is a result of the mismatching of these resistors. The chopperstabilizing technique cancels the mismatching of the resistors by changing the direction of the current flowing through the Hall plate and Hall voltage measurement taps, while maintaining the Hall-voltage signal that is induced by the external magnetic flux. The signal is, then, captured by a sample-and-hold circuit.

Operation. The output of these devices switches low (turns ON) when a magnetic field (south pole) perpendicular to the Hall sensor exceeds the operate point threshold (BOP). After turn-ON, the output is capable of sinking 25 mA and the output voltage is V

OUT(SAT)

. When the magnetic field is reduced below the release point (BRP), the device output goes high (turns OFF). The difference in the magnetic operate and release points is the hysteresis (B

) of the device. This built-in hysteresis allows

hys

clean switching of the output even in the presence of external mechanical vibration and electrical noise.

Applications. It is strongly recommended that an external bypass capacitor be connected (in close proximity to the Hall sensor) between the supply and ground of the device to reduce both external noise and noise generated by the chopper-stabilization technique.

OUTPUT VOLTAGE

REG

—

HALL VOLTAGE

Dwg. AH-011-2

FLUX DENSITY

& HOLD

SAMPLE

Dwg. EH-012

OUT(SAT)

Dwg. GH-007-2

SUPPLY

The simplest form of magnet that will operate these devices is a bar magnet with the south-seeking pole towards the branded surface of the device. Many other methods of operation are possible. Extensive applications information on magnets and Hall-effect sensors is also available in the Allegro Electronic Data Book AMS-702 or Application Note 27701, or

www.allegromicro.com

PTCT

0.1 µF

OUTPUT

SUPPLY

Dwg. EH-013

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3150

PROGRAMMABLE, CHOPPERSTABILIZED, PRECISION, HALL-EFFECT SWITCH

PROGRAMMING PROTOCOL

The A3150JLT and A3150JUA operate points are programmed by serially addressing the device through the supply terminal (pin1). After the correct operate point is determined, the device programming bits are selected and then a “lock” set to prevent any further (accidental) programming.

Program Enable. To program the device, a sequence of pulses is used to activate/enable the addressing mode as shown in figure 1. This sequence of a V seven VPH pulses, and a VPP pulse with no supply interruptions, is designed to prevent the device from being programmed accidentally (for example, as a result of noise on the supply line).

pulse, at least

d(1)

PROGRAM ENABLE

(AT LEAST 7 PULSES)

d(1)

d(0)

Dwg. WH-013

Figure 1 — Program enable

PROGRAMMING PROTOCOL over operating temperature range.

Limits

Characteristic Symbol Description Min. Typ. Max. Units

Programming Voltage V

Programming Current I

Pulse Width t

Pulse Rise Time t

Pulse Fall Time t

d(0)

d(1)

NOTE: Typical data is at TA = +25°C and is for design information only.

Minimum voltage during programming 4.5 5.0 5.5 V

9.0 10 11 V

20 23 25 V

Max. supply current during programming – 250 – mA

OFF time between bits 20 – – µs

Enable, address, program, or lock bit ON time

20 – – µs

Program pulse ON time 100 300 – µs

VPL to VPH or V

VPH or VPP to V

11 – – µs

5.0 – – µs

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

Page 7

Address Determination. The operate point is adjust-

able in 64 increments. With the appropriate target or gear* in position, the 64 switch points are sequentially selected (figure 2) until the required operate point is reached. Note that the difference between the operate point and the release point (hysteresis) is a constant for all addresses.

Set-Point Programming. After the desired set-point address is determined (0 through 63), each bit of the equivalent binary address is programmed individually. For example, as illustrated in figure 3, to program address code 5 (binary 000101), bits 1 and 3 need to be programmed. Each bit is programmed during the wide V

pulse and is not reversible.

PROGRAMMABLE, CHOPPER-

STABILIZED, PRECISION,

HALL-EFFECT SWITCH

VPH

VPL

ADDRESS 0

ADDRESS 1

ADDRESS 2

td(1) td(0)

Figure 2 — Address determination

ADDRESS N-2

3150

ADDRESS N-1

Dwg. WH-014

ADDRESS N

(UP TO 63)

Lock Programming. After the desired set point is programmed, the program lock is then activated (figure 4) to prevent further programming of the device.

d(1)

PROGRAM ENABLE

d(1)

BIT 3 PROGRAM

(000100)

ADDRESS 4

d(0)

Figure 3 — Set-point programming

d(1)

PROGRAM ENABLE LOCK PROGRAM

d(1)

d(0)

Figure 4 — Lock programming

PROGRAM ENABLE

BIT 1 PROGR

Dwg. WH-015

(65 PULSES)

Dwg. WH-016

* In application, the terms “gear” and “target” are often interchanged. However, “gear” is preferred when motion is transferred.

www.allegromicro.com

Page 8

3150

PROGRAMMABLE, CHOPPERSTABILIZED, PRECISION, HALL-EFFECT SWITCH

CRITERIA FOR DEVICE QUALIFICATION

All Allegro sensors are subjected to stringent qualification requirements prior to being released to production.

To become qualified, except for the destructive ESD tests, no failures are permitted.

Qualification Test Test Method and Test Conditions Test Length Samples Comments

Biased Humidity (HAST) T

= 130°C, RH = 85% 50 hrs 77 V

= V

OUT

= 5 V

High-Temperature JESD22-A108, 408 hrs 77 VCC = 24 V, Operating Life (HTOL) T

= 150°C, TJ = 165°CV

OUT

= 20 V

Accelerated HTOL JESD22-A108, 504 hrs 77 VCC = 24 V,

= 175°C, TJ = 190°CV

OUT

= 20 V

Autoclave, Unbiased JESD22-A102, Condition C, 96 hrs 77

= 121°C, 15 psig

High-Temperature MIL-STD-883, Method 1008, 1000 hrs 77 (Bake) Storage Life T

= 170°C

Temperature Cycle MIL-STD-883, Method 1010, 500 cycles 77

-65°C to +150°C

Latch-Up — Pre/Post 6

Reading

Electro-Thermally — Pre/Post 6 Induced Gate Leakage Reading

ESD, CDF-AEC-Q100-002 Pre/Post x per Test to failure, Human Body Model Reading test All leads > TBD

Electrical Distributions Per Specification — 30

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

Page 9

SENSOR LOCATIONS

(±0.005” [0.13 mm] die placement)

Package Designator “LT”

3150

PROGRAMMABLE, CHOPPER-

STABILIZED, PRECISION,

HALL-EFFECT SWITCH

ACTIVE AREA DEPTH

0.030"

0.76 mm NOM

0.088"

2.24 mm

0.045"

1.14 mm

1 32

Dwg. MH-008-8

Package Designators “UA” and "UA-TL"

ACTIVE AREA DEPTH

0.018"

0.46 mm NOM

0.080"

2.04 mm

0.056"

1.44 mm

BRANDED SURFACE

1 32

Dwg. MH-011-9A

Although sensor location is accurate to three sigma for a particular design, product improvements may result in small changes to sensor location.

Allegro

www.allegromicro.com

Page 10

3150

a a a

PROGRAMMABLE, CHOPPERSTABILIZED, PRECISION, HALL-EFFECT SWITCH

PACKAGE DESIGNATOR 'LT'

(SOT-89/TO-243AA)

0.167

0.155

0.047

0.035

0.059

BSC

Dimensions in Inches

(for reference only)

0.181

0.173

0.072

0.064

0.102

0.0221

0.0173

0.090

0.0189

0.0142

0.118

BSC

0.063

0.055

0.090

0.084

0.0173

0.0138

Dwg. MA-009-3A in

4.25

3.94

Dimensions in Millimeters

(controlling dimensions)

4.60

4.40

1.83

1.62

2.60

1.20

0.89

1.50

BSC

3.00

BSC

0.56

0.44

2.29

0.48

0.36

1.60

1.40

2.29

2.13

0.44

0.35

Dwg. MA-009-3A mm

0.098

0.079

0.031

0.102

0.181

0.047

0.031

TYP

0.028

TYP

ds 1, 2, 3, and A — Standard SOT-89 Layout ds 1, 2, 3, and B — Low-Stress Version ds 1, 2, and 3 only — Lowest Stress, But Not Self Aligning

Dwg. MA-012-3 in

0.7

TYP

Pads 1, 2, 3, and A — Standard SOT-89 Layout Pads 1, 2, 3, and B — Low-Stress Version Pads 1, 2, and 3 only — Lowest Stress, But Not Self Aligning

2.5

2.0

0.8

2.6

1.2

0.8

TYP

4.6

Dwg. MA-012-3 mm

NOTE: Exact body and lead configuration at vendor’s option within limits shown.

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

Page 11

PROGRAMMABLE, CHOPPER-

STABILIZED, PRECISION,

PACKAGE DESIGNATOR 'UA'

3150

HALL-EFFECT SWITCH

SEE NOTE

Dimensions in Inches

(controlling dimensions)

0.164

0.159

45°

0.122

0.117

0.085

123

MAX

0.640

0.600

0.062

0.058

0.031

0.0189

0.0142

0.0173

0.0138

45°

SEE NOTE

45°

3.10

2.97

16.26

15.24

Dimensions in Millimeters

(for reference only)

4.17

4.04

1.57

1.47

2.16

123

MAX

0.79

0.48

0.36

45°

0.44

0.35

0.050

BSC

Dwg. MH-014E in

1.27

BSC

Dwg. MH-014E mm

Surface-Mount Lead Form (Suffix '-TL')

0.095

±0.005

0.004

MAX

0.002

MAX

0°–8°

0.020

MIN

FLAT

Dwg. MH-015 in

0.10

MAX

0.051

MAX

0°–8°

0.51

MIN

FLAT

NOTES: 1. Tolerances on package height and width represent allowable mold offsets. Dimensions given are measured at the widest point (parting line).

2. Exact body and lead configuration at vendor’s option within limits shown.

3. Height does not include mold gate flash.

4. Recommended minimum PWB hole diameter to clear transition area is 0.035” (0.89 mm).

5. Where no tolerance is specified, dimension is nominal.

2.41

±0.13

Dwg. MH-015 mm

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Page 12

3150

PROGRAMMABLE, CHOPPERSTABILIZED, PRECISION, HALL-EFFECT SWITCH

The products described herein are manufactured under one or more of the following U.S. patents: 5,045,920; 5,264,783; 5,442,283; 5,389,889; 5,581,179; 5,517,112; 5,619,137; 5,621,319; 5,650,719; 5,686,894; 5,694,038; 5,729,130; 5,917,320; and other patents pending.

Allegro MicroSystems, Inc. reserves the right to make, from time to time, such departures from the detail specifications as may be required to permit improvements in the performance, reliability, or manufacturability of its products. Before placing an order, the user is cautioned to verify that the information being relied upon is current.

Allegro products are not authorized for use as critical components in life-support appliances, devices, or systems without express written approval.

The information included herein is believed to be accurate and reliable. However, Allegro MicroSystems, Inc. assumes no responsibility for its use; nor for any infringements of patents or other rights of third parties that may result from its use.

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