APS11800LUAALT2SL1A_技术文档

APS11800

2

-

Two-Wire Hall-Effect Switch with Advanced Diagnostics

FEATURES AND BENEFITS

• Functional safety

DESCRIPTION

The APS11800 is a two-wire planar Hall-effect sensor

integrated circuit (IC) developed in accordance with

ISO 26262:2011. It includes internal diagnostics and a fault

state that support a functional safety level of ASIL B when

integratedandusedinconjunctionwiththeappropriatesystem-

level control. The two-wire interface provides interconnect

open/short diagnostics and a fault state to communicate

diagnostic information while maintaining compatibility

with legacy two-wire systems. The continuous background

diagnostics are transparent to the host system and results in

a reduced fault tolerant time.

▫ Developed in accordance with ISO 26262:2011

(pending assessment)

▫ Designed to meet ASIL B requirements

▫ Integrated background diagnostics for:

◦ Signal path

◦ Regulator

◦ Hall plate and bias

◦ Overtemperature detection

◦ Nonvolatile memory

▫ Defined fault state

• Multiple product options

The APS11800 product options include magnetic switch

points, temperature coefficient, magnetic and output

polarity. The switch points are configured for a stable or

flat temperature response. Additional temperature response

characteristics for NdFeB or low-cost ferrite magnets may

be available by contacting Allegro MicroSystems. For

situations where a functionally equivalent two-wire latch

device is preferred, refer to the APS12800.

▫ Magnetic polarity, switch points, and hysteresis

▫ Temperature coefficient

▫ Output polarity

• Reduces module bill-of-materials (BOM) and assembly cost

▫ ASIL B sensor can replace redundant sensors

▫ Integrated overvoltage clamp and reverse-battery diode

• Automotive-grade ruggedness and fault tolerance

▫ Extended AEC-Q100 Grade 0 qualification

▫ Operation to 175°C junction temperature

▫ 3 to 30 V operating voltage range

▫ ±8 kV HBM ESD

Continued on next page...

APPLICATIONS

▫ Overtemperature indication

• Automotive and industrial safety systems

• Limit switches and safety interlocks

• Seat position detection

3-Pin SIP

(Suﬃx UA)

PACKAGES

• Seat belt buckles

• Hood/trunk/door latches

• Transmission pawl, fork, piston, valve, gear position

detection

3-Pin SOT23W

(Suﬃx LH)

Not to scale

VDD

Regulator

Undervoltage Monitor

Internal Oscillator

To All Subcircuits

Schmitt

Trigger

Hall Plate

and Input

Diagnostics

Output

Control

Sample, Hold,&

Averaging

Signal Path

Diagnostics

H

ALL

MP

A

.

Low-Pass

Filter

Programming

Diagnostics

Programming

System Diagnostics

GND

Figure 1: Functional Block Diagram

APS11800-DS

MCO-0000805

March 24, 2020

APS11800

Two-Wire Hall-Effect Switch with Advanced Diagnostics

DESCRIPTION (continued)

APS11800 sensors are engineered to operate in the harshest operation directly from an automotive 12 V battery system. These

environmentswithminimalexternalcomponents.Theyarequalified integrated features reduce the end-product bill-of-materials (BOM)

beyond the requirements of AEC-Q100 Grade 0 and will survive and assembly cost.

extended operation at 175°C junction temperature.

Package options include industry-standard surface-mount SOT

These monolithic ICs include on-chip reverse-battery protection, (LH) and through-hole SIP (UA) packages. Both packages are

overvoltage protection (e.g., 40 V load dump), ESD protection, RoHS-compliant and lead (Pb) free with 100% matte-tin-plated

overtemperature detection, and an internal voltage regulator for leadframes.

RoHS

COMPLIANT

SELECTION GUIDE ^[1]

Ouput

Polarity for

B > B_OP

Device Switch

Threshold

Magnitude (G)

Magnetic

Temperature

Coefficient

Operating

Mode

I_CC(L)Selection

(mA)

Part Number

Package

Packing

3-pin SOT23-W

surface mount

7-inch reel,

3000 pieces/reel

APS11800LLHALT-0SH1A

APS11800LLHALX-0SH1A

APS11800LLHALT-0SL1A

APS11800LLHALX-0SL1A

APS11800LUAA-0SH1A

APS11800LUAA-0SL1A

Unipolar

South

B_OP: 50 to 110;

Flat

I_CC(H)

5 to 6.9

B

_RP: 45 to 105

3-pin SOT23-W

surface mount

13-inch reel,

10000 pieces/reel

3-pin SOT23-W

surface mount

7-inch reel,

3000 pieces/reel

Unipolar

South

B_OP: 50 to 110;

_RP: 45 to 105

I_CC(L)

B

3-pin SOT23-W

surface mount

13-inch reel,

10000 pieces/reel

3-pin SIP

through-hole

Bulk,

500 pieces/bag

Unipolar

South

B_OP: 50 to 110;

B_RP: 45 to 105

Flat

I_CC(H)

I_CC(L)

5 to 6.9

3-pin SIP

through-hole

Bulk,

500 pieces/bag

Unipolar

South

B_OP: 50 to 110;

B_RP: 45 to 105

^[1]Contact Allegro MicroSystems for options not listed in the standard selection guide.

2

Allegro MicroSystems

955 Perimeter Road

Manchester, NH 03103-3353 U.S.A.

www.allegromicro.com

APS11800

Two-Wire Hall-Effect Switch with Advanced Diagnostics

ꢀoꢁꢂlete Part

ꢃꢄꢁꢅer ꢆorꢁat

Allegro Iden�ﬁer (Device Family)

APS – Digital Posi�on Sensor

Allegro Device Number

11800 – 2-wire ASIL-B Planar Hall-eﬀect Switch

Conﬁgura�on Op�ons

A P S 1 1 8 0 0 L L H A L X _-0 S L 1 A

Temperature Coeﬃcient

A – Flat

I_CCLOWSelec�on

1 – 5 to 6.9 mA

2 – 2 to 5 mA

Output Polarity for B > B_OP

H – I_CC(H)

L – I_CC(L)

Opera�ng Mode

N – Unipolar North Sensing

S – Unipolar South Sensing

P – Omnipolar (North and South) Sensing

Device Switch Threshold Magnitude

0 – B_OP: 50 to 110 G, B_RP: 45 to 105 G

1 – B_OP: 20 to 60 G, B_RP: 10 to 55 G

2 – B_OP: 20 to 80 G, B_RP: 10 to 60 G

Instruc�ons (Packing)

(no op�on code) – Bulk, 500 pieces/bag (UA Only)

LT – 7-in. reel, 3,000 pieces/reel (LH Only)

LX – 13-in. reel, 10,000 pieces/reel (LH Only)

Package Designa�on

LHA – 3-pin SOT23W Surface Mount

UAA – 3-pin SIP Through-Hole

Ambient Opera�ng Temperature Range

L – -40°C to +150°C

ABSOLUTE MAXIMUM RATINGS

Characteristic

Symbol

V_CC

Notes

Rating

45

Unit

V

Forward Supply Voltage ^[1]

Reverse Supply Voltage ^[1]

V_RDD

–30

V

165

°C

Maximum Junction Temperature

Storage Temperature

T_J(MAX)

T_stg

1000 hours

175

–65 to 170

^[1]This rating does not apply to extremely short voltage transients such as Load Dump and/or ESD. Those events have individual ratings, specific to

the respective transient voltage event.

ESD PERFORMANCE

Characteristic

Symbol

Notes

Rating

Unit

AEC-Q100 ESD

V_ESD(HBM)

Human Body Model AEC-Q100-002

±8

kV

3

Allegro MicroSystems

955 Perimeter Road

Manchester, NH 03103-3353 U.S.A.

www.allegromicro.com

APS11800

Two-Wire Hall-Effect Switch with Advanced Diagnostics

TRANSIENT PROTECTION CHARACTERISTICS: Valid for T_A= 25°C and C_BYP= 0.1 µF (unless otherwise speciﬁed)

Characteristics

Symbol

V_Z

Test Conditions

I_CC(max)+ 3 mA

Min.

44

–

Typ.

Max.

–

Unit

V

Forward Supply Zener Clamp Voltage

Reverse Supply Zener Clamp Voltage

Reverse Supply Current

–

V_RCC

I_RCC

I_CC= –1 mA

–30

–5

V

V_RCC= –30 V

–

mA

PINOUT DIAGRAMS AND TERMINAL LISTS

3

1

2

1

2

3

Package LH, 3-Pin

SOT23W Pinout

Package UA, 3-Pin

SIP Pinout

Terminal List Table

Pin Number

Symbol

LH

Package

UA

Package

Description

VCC

GND

1

2

3

Supply Voltage

2*

3*

Ground

* Pins 2 and 3 are tied together internally and the device will operate with

either pin 2 or 3 grounded externally; however, grounding both pins

externally is recommended for EMC robustness.

4

Allegro MicroSystems

955 Perimeter Road

Manchester, NH 03103-3353 U.S.A.

www.allegromicro.com

APS11800

Two-Wire Hall-Effect Switch with Advanced Diagnostics

OPERATING CHARACTERISTICS: Valid over full operating voltage and ambient temperature ranges for T_J< T_J(max), and

_BYP= 0.1 µF, unless otherwise speciﬁed

C

Characteristics

Symbol

Test Conditions

Min.

Typ. ^[1]

Max.

Unit

Supply Voltage

V_CC

Operating; min. V_CCfor magnetically actuated output

3

–

30

V

Voltage threshold at which the device output is set to POS

during power down

Undervoltage Lockout

Shutdown Voltage

V_UVLO

V_SD

–

2.3

–

V

Sensor output shuts down

I_CCLOWSelection = 2

–

2

1.8

–

5

V

mA

I_CC(L)

I_CCLOWSelection = 1

5

–

6.9

17

Supply Current

I_CC(H)

I_FAULT

12

–

Safe current state; indicates device diagnostics have

detected a fault condition; see Table 1

0.2

–

1.8

mA

Standard circuit; C_BYP= 100 nF, C_L^[2]= 20 pF, R_SENSE=100 Ω

Min. circuit; C_BYP= 10 nF, C_L^[2]= 20 pF, R_SENSE= 100 Ω

–

0.4

4

–

mA/µs

Output Slew Rate

dI/dt

t_PO

On power up only; time starts when supply voltage

exceeds V_CC(min)

Power-On Time ^[3]

Power-On State ^[4]

–

70

µs

Output state during power on; valid only when V_CC

V_CC(min)

≥

POS

f_C

I_CC(H)

–

mA

Chopping Frequency

800

kHz

Diagnostic Characteristics

Fault Reaction Time

t_DIAG

t_DIAGF

T_JF

C_BYP= 0.1 µF, R_SENSE= 100 Ω

–

44

2

–

µs

ms

°C

Diagnostic Fault Retry Time

Overtemperature Shutdown

Overtemperature Hysteresis

Temperature increasing

205

25

T_HYS

^[1]Typical data is at T_A= 25°C and V_CC= 12 V, unless otherwise noted; for design information only.

^[2]C_L– measurement probe capacitance.

^[3]Measured from V_CC≥ V_CC(min)to valid output.

^[4]Power-on state is defined only when V_CCslew rate > 6 V/ms.

5

Allegro MicroSystems

955 Perimeter Road

Manchester, NH 03103-3353 U.S.A.

www.allegromicro.com

APS11800

Two-Wire Hall-Effect Switch with Advanced Diagnostics

MAGNETIC CHARACTERISTICS: Valid over full operating voltage and ambient temperature ranges for T_J< T_J(max), and

_BYP= 0.1 µF, unless otherwise speciﬁed

C

Magnetic

Switch-

point

Temperature

Coefficient

Characteristics

Symbol

Test Conditions

Min.

Typ. ^[1]

Max.

Unit ^[2]

Option

Magnetic Characteristics

-0

-1

-2

-0

-1

-2

All

A – Flat

All

T_A= –40°C to 150°C

50

20

45

10

5

–

110

60

G

Operate Point

B_OP

80

105

55

Release Point

Hysteresis

B_RP

60

B_HYS

T_C

30

Switch Point Temperature

Coefficient

All

A - Flat

T_A= –40°C to 150°C

–

0

–

%/°C

^[1]Typical data is at T_A= 25°C and V_CC= 12 V, unless otherwise noted; for design information only.

^[2]Magnetic ﬂux density, B, is indicated as a negative value for north-polarity magnetic ﬁelds, and a positive value for south-polarity magnetic ﬁelds.

6

Allegro MicroSystems

955 Perimeter Road

Manchester, NH 03103-3353 U.S.A.

www.allegromicro.com

APS11800

Two-Wire Hall-Effect Switch with Advanced Diagnostics

THERMAL CHARACTERISTICS: May require derating at maximum conditions; see application information

Characteristic

Symbol

Notes

Rating

Unit

Package LH, 1-layer PCB with copper limited to solder pads

228

°C/W

Package LH, 2-layer PCB with 0.463 in.²of copper area, each

side connected by thermal vias

Package Thermal Resistance

R_θJA

110

165

°C/W

Package UA, 1-layer PCB with copper limited to solder pads

Power Derating ꢍꢊrve

ꢀ1

ꢀ0

ꢆꢅ

ꢆ8

ꢆꢄ

ꢆꢃ

ꢆꢂ

ꢆꢁ

ꢆꢀ

ꢆꢆ

ꢆ1

ꢆ0

1ꢅ

18

1ꢄ

1ꢃ

1ꢂ

1ꢁ

1ꢀ

1ꢆ

11

10

ꢅ

ꢌ_{ꢍꢍꢎꢉaꢈꢏ}

ꢒH Pacꢓage

ꢆ-laꢔer Pꢍꢕ

ꢖA Pacꢓage

1-laꢔer Pꢍꢕ

ꢒH Pacꢓage

1-laꢔer Pꢍꢕ

8

ꢄ

ꢃ

ꢂ

ꢌ_{ꢍꢍꢎꢉinꢏ}

ꢁ

ꢀ

ꢆ0

ꢁ0

ꢃ0

80

100

1ꢆ0

1ꢁ0

1ꢃ0

180

Teꢉꢐeratꢊre ꢎꢑꢍꢏ

7

Allegro MicroSystems

955 Perimeter Road

Manchester, NH 03103-3353 U.S.A.

www.allegromicro.com

APS11800

Two-Wire Hall-Effect Switch with Advanced Diagnostics

FUNCTIONAL DESCRIPTION

cal vibration and electrical noise. Figure 3 shows the output

switching behavior relative to increasing and decreasing magnetic

Operation

The output of these devices switches when a magnetic field

perpendicular to the Hall-effect sensor exceeds the operate point

threshold (B_OP). When the magnetic field is reduced below the

release point, B_RP, the device output switches to the alternate

state. The output state (polarity) and magnetic field polarity

depends on the selected device options. For unipolar south, an

increasing south field is required; likewise, for unipolar north, an

increasing north field is required to exceed B_OP. The output state

is a configuration option.

field. On the horizontal axis, the B+ direction indicates increasing

south polarity magnetic field strength. Figure 2 shows the sensing

orientation of the magnetic field, relative to the device package.

The difference between operate (B_OP) and release (B_RP) points

is the hysteresis, B_HYS. Hysteresis allows clean switching of the

output even in the presence of external mechanical vibration and

electrical noise.

Figure 3 shows the potential unipolar and omnipolar options and

output polarity options the APS11800 can be configured for. The

direction of the applied magnetic field is perpendicular to the

branded face of the APS11800.

The difference in magnetic operate and release points is the hys-

teresis, B_HYS, of the device. This built-in hysteresis allows clean

switching of the output even in the presence of external mechani-

Y

X

A

B

Z

Figure 2: Magnetic Sensing Orientations

LH Package (Panel A), UA Package (Panel B)

8

Allegro MicroSystems

955 Perimeter Road

Manchester, NH 03103-3353 U.S.A.

www.allegromicro.com

APS11800

Two-Wire Hall-Effect Switch with Advanced Diagnostics

ꢃꢄniꢁolar

ꢌꢍPHꢍꢎ

ꢀniꢁolar Soꢅth

ꢌꢍSHꢍꢎ

ꢀniꢁolar ꢂorth

ꢌꢍꢂHꢍꢎ

ꢁꢇ

ꢁ_{ꢂꢂꢃHꢄ}

Standard

ꢃꢅtꢁꢅt

Polaritꢆ

ꢇPꢃꢈ ꢉ Hꢊ

ꢁ_{ꢂꢂꢃꢀꢄ}

0

ꢅ-

0

ꢅꢇ

0

ꢅꢇ

ꢅ_HꢆS

ꢀniꢁolar ꢂorth

ꢌꢍꢂꢈꢍꢎ

ꢃꢄniꢁolar

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ꢀniꢁolar Soꢅth

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ꢁ_{ꢂꢂꢃHꢄ}

ꢋeversed

ꢃꢅtꢁꢅt

ꢁ_{ꢂꢂꢃHꢄ}

Polaritꢆ

ꢇPꢃꢈ ꢉ ꢈꢊ

ꢁ_{ꢂꢂꢃꢀꢄ}

0

ꢅ-

0

ꢅ-

0

ꢅꢇ

0

ꢅꢇ

ꢅ_HꢆS

Figure 3: Hall Switch Output State vs. Magnetic Field

B- indicates increasing north polarity magnetic ﬁeld strength, and

B+ indicates increasing south polarity magnetic ﬁeld strength.

9

Allegro MicroSystems

955 Perimeter Road

Manchester, NH 03103-3353 U.S.A.

www.allegromicro.com

APS11800

Two-Wire Hall-Effect Switch with Advanced Diagnostics

fications are not be guaranteed over temperature and process

corners when V_UVLO< V_CC< V_CC(min). As soon as V_CCexceeds

Power-On/Off Behavior

During power up when V_CCreaches V_CC(min), the output will

enter Power-On State and stay there until t_POexpires. The t_PO

timer starts as soon as V_CCexceeds V_CC(min); once t_POexpires,

the device output is determined by the B_OP/B_RPspecifications.

(Note the minimum allowed power V_CCslew rate is 6 V/ms to

ensure that V_CChas reached V_CC(min)within t_PO).

V_CC(min), B_OP/B_RPlimits will be guaranteed over process and

temperature. See Figure 5. If V_CCcontinues to drop below the

UVLO threshold, the device output will be forced to POS (I_CC(H)

and will remain there as long as V_PD< V_CC≤ V_CC(min). Once

)

V_CChas dropped below V_UVLO, the device will go through

power-up sequence once V_CCis restored. If V_CCcontinues to

drop below V_PD, the device will power down and the output will

After the device is powered up, if V_CCdrops below V_CC(min), the

output state will continue to function; however, B_OP/B_RPspeci-

not be functional until V_CCis restored to be >V_CC(min)

.

ꢀ

V_CC(min)

UVLO

V_PD

ꢂ

tPO

t

POS

I_CC(H)

Output Valid

Output Not Valid

BOP/BRP Not Guaranteed

I_CC(L)

t

Figure 4: Device power up and subsequent restart after falling below V_CC(min)but not below V_UVLO

ꢀ

V_CC(min)

UVLO

V_SD

ꢂ

tPO

t

POS

I_CC(H)

Output Valid

ꢀꢁtꢂꢁt ꢃalid

Output Not Valid

BOP/BRP Not

Guaranteed

I_CC(L)

Figure 5: Device power up and subsequent reset after V_CCfalls below V_UVLO

10

Allegro MicroSystems

955 Perimeter Road

Manchester, NH 03103-3353 U.S.A.

www.allegromicro.com

APS11800

Two-Wire Hall-Effect Switch with Advanced Diagnostics

supply current will be in the I_FAULTregion. Additionally, if the

any of the device internal diagnostics described in Table 1 detect

a fault, the output will go to I_FAULT. A supply current greater

than the specified maximum for the high level (I_CC> I_CC(H)(max)),

typically indicates a short condition. I_CC< I_FAULT(min)typically

indicates an open circuit condition.

Two-Wire Interface

The regulated current output is configured for two-wire applica-

tions, requiring one less wire for operation than switches with

the traditional open-collector output. Additionally, the two-wire

interface provides basic diagnostics to the system by monitoring

the supply current. During normal operation, the supply current

should operate in the specified ranges; see Figure 6. Any current

level not within the specified operating ranges for I_CC(H)or I_CC(L)

indicates a fault condition.

This unique two-wire interface protocol is backward compatible

with legacy systems using two-wire switches. Additionally, the

low fault mode supply current resulting from an internal fault will

fall outside of the low and high supply current ranges and can be

similarly identified as a sensor fault.

There are a couple specific fault conditions indicated by I_CC

I_FAULT. If the device junction temperature exceeds T_JF, average

=

ꢎmA

ꢀaꢁlt

ꢇ_{ꢈꢈꢉHꢊ}ꢉmaꢋꢊ

ꢇ_{ꢈꢈꢉHꢊ}ꢉminꢊ

ꢇ_{ꢈꢈꢉHꢊ}Range

ꢀaꢁlt

ꢇ_{ꢈꢈꢉꢌꢊ}ꢉmaꢋꢊ

ꢇ_{ꢈꢈꢉꢌꢊ}ꢉminꢊ

ꢇ_{ꢈꢈꢉꢌꢊ}Range

ꢇ_ꢀAUꢌꢍRange

ꢀaꢁlt

ꢂꢃertemꢄ or ꢅiagnostic ꢆrror

ꢀaꢁlt

ꢇ_ꢀAUꢌꢍ

0

Figure 6: Two-Wire Interface Output

11

Allegro MicroSystems

955 Perimeter Road

Manchester, NH 03103-3353 U.S.A.

www.allegromicro.com

APS11800

Two-Wire Hall-Effect Switch with Advanced Diagnostics

path monitoring system verifies two internal state transitions (B_OP

and B_RPwithin limits) under normal operation. In cases when

these output transitions do not occur, or if another internal fault is

detected, the output will go to the safe state.

Functional Safety

The APS11800 was developed in accordance with the interna-

tional standard for automotive functional safety, ISO 26262:2011.

Designed to meet ASIL B requirements when integrated and used

in conjunction with the appropriate system level control, in the

manner prescribed in the APS11800 Safety Manual.

In the event of an internal fault, the device will continuously run

the diagnostics routine every 2 ms (t_DIAGF). The periodic recov-

ery attempt sequence allows the device to continually check for

the presence of a fault and return to normal operation if the fault

condition clears.

The APS11800 features a proprietary diagnostics routine to sup-

port ASIL B safety requirements; see Table 1 and Figure 7. This

internal diagnostics routine continuously runs in the background,

monitoring all key subsystems of the IC. The diagnostic scheme

runs at high speed and provides minimal impact on device perfor-

mance.

In the case where the fault is no longer present, the output will

resume normal operation. However, if the fault is persistent, the

device will not exit fault mode and I_CCwill continue to be I_FAULT

.

See Figure 8.

The Hall element biasing circuit and voltage regulator are

checked for valid operation, and the digital and nonvolatile

memory blocks are checked for valid device configuration.

When a system rating higher than ASIL B is required, additional

external safety measures may be employed (e.g., sensor redun-

dancy and rationality checks, etc.). Refer to the device safety

manual for additional details about the diagnostics.

All diagnostics are running in real time in the background, allow-

ing for a fault reaction time of approximately 44 µs. The signal

Table 1: Diagnostics Coverage

Feature

Coverage

1

2

3

4

5

6

Hall plate

Connectivity and biasing of Hall plate

Signal path

Signal path and Schmitt trigger

Voltage regulator

Digital subsystem

Entire system

Output

Regulator voltage for normal operation

Digital subsystem and non-volatile memory

Overtemperature and redundancies for single point failures

Output verified with external monitors

VDD

3

Regulator

5

Undervoltage Monitor

Internal Oscillator

To All Subcircuits

1

2

6

Schmitt

Trigger

Hall Plate

and Input

Diagnostics

Output

Control

Sample, Hold,&

Averaging

Signal Path

Diagnostics

H

ALL

MP

A

.

Low-Pass

Filter

Programming

Diagnostics

Programming

4

System Diagnostics

GND

Figure 7: Device Functional Block Diagram with Diagnostic Features Indicated

12

Allegro MicroSystems

955 Perimeter Road

Manchester, NH 03103-3353 U.S.A.

www.allegromicro.com

APS11800

Two-Wire Hall-Effect Switch with Advanced Diagnostics

I_CC

Failure Detected

Device Recovers

I_CC(H)

ꢀꢁtꢂꢁt switches

according to eꢃternal

magnetic ꢄield

according to eꢃternal

magnetic ꢄield

ꢅinternal diagnostics actiꢆeꢇ

Diag Retry^*

I_CC(L)

I_FAULT

2 ms

ꢈ ꢉor a deꢆice with oꢂtion ꢊ_{ꢋꢋꢌꢀꢍ}Selection ꢎ 1, ꢊ_ꢋꢋgoes to the ꢊ_{ꢋꢋꢅꢌꢇ}sꢂeiꢄicied ꢏy ꢊ_{ꢋꢋꢌꢀꢍ}Selection ꢎ ꢐ dꢁring ꢑiagnostics Retry.

Similarly, ꢄor a deꢆice with oꢂtion ꢊ_{ꢋꢋꢌꢀꢍ}Selection ꢎ ꢐ, ꢊ_ꢋꢋgoes to the ꢊ_{ꢋꢋꢅꢌꢇ}sꢂeiꢄicied ꢏy ꢊ_{ꢋꢋꢌꢀꢍ}Selection ꢎ 1 dꢁring ꢑiagnostics Retry.

ꢒhis diꢄꢄerentiates a normal oꢂeration condition ꢄrom a ꢄaꢁlt condition.

t

Figure 8: Diagnostic mode operation and timing during normal operation and during a fault condition

13

Allegro MicroSystems

955 Perimeter Road

Manchester, NH 03103-3353 U.S.A.

www.allegromicro.com

APS11800

Two-Wire Hall-Effect Switch with Advanced Diagnostics

APPLICATIONS INFORMATION

Extensive applications information on magnets and Hall-effect

sensors is available in:

Typical Applications

For the LH and UA, an external bypass capacitor, C_BYP, should

be connected as close as possible to the Hall sensor between the

supply and ground to reduce noise. See Figure 9.

• Hall-Effect IC Applications Guide, AN27701,

• Hall-Effect Devices: Guidelines For Designing Subassemblies

Using Hall-Effect Devices AN27703.1

Temperature Coefficient and Magnet Selection

• Soldering Methods for Allegro’s Products – SMT and Through-

Hole, AN26009

The APS11800 incorporates circuitry to compensate the magnetic

switch points over the operating temperature range. This feature

is referred to as the magnetic switch point temperature coeffi-

cient. The default option is for flat stable response over tempera-

ture. If the application requires compensation for temperature

drifts common with NdFeB and ferrite magnets, contact Allegro

MicroSystems. It is recommended that system designers evalu-

ate their magnetic circuit over the expected operating temperature

range to ensure the magnetic switching requirements are met.

• Functional Safety Challenges to the Automotive Supply Chain

(http://www.allegromicro.com/en/Design-Center/Technical-

Documents/General-Semiconductor-Information/Functional-

Safety-Challenges-Automotive-Supply-Chain.aspx)

All are provided on the Allegro website:

www.allegromicro.com

ECU

V+

VCC

APS11800

R_{SENS E}

V_{SENS E}

V+

C_BYP

0.1 µF

VCC

A119x

APS11800

C_BYP

0.1 µF

GND

V_{SENS E}

ECU

GND

R_{SENS E}

(A) Low-Side Sensing

(B) High-Side Sensing

Figure 9: Typical Application Circuits

14

Allegro MicroSystems

955 Perimeter Road

Manchester, NH 03103-3353 U.S.A.

www.allegromicro.com

APS11800

Two-Wire Hall-Effect Switch with Advanced Diagnostics

CHOPPER STABILIZATION

A limiting factor for switch point accuracy when using Hall-effect The subsequent demodulation acts as a modulation process for

technology is the small-signal voltage developed across the Hall

plate. This voltage is proportionally small relative to the offset

that can be produced at the output of the Hall sensor. This makes

it difficult to process the signal and maintain an accurate, reliable

output over the specified temperature and voltage range. Chopper

stabilization is a proven approach used to minimize Hall offset.

the offset, causing the magnetically induced signal to recover

its original spectrum at baseband while the DC offset becomes

a high-frequency signal. Then, using a low-pass filter, the signal

passes while the modulated DC offset is suppressed.

Allegro’s innovative chopper stabilization technique uses a high-

frequency clock. The high-frequency operation allows a greater

sampling rate that produces higher accuracy, reduced jitter, and

faster signal processing. Additionally, filtering is more effective and

results in a lower noise analog signal at the sensor output. Devices

such as the APS11800 that use this approach have a stable quies-

cent Hall output voltage, are immune to thermal stress, and have

precise recoverability after temperature cycling. This technique is

made possible through the use of a BiCMOS process which allows

the use of low-offset and low-noise amplifiers in combination with

high-density logic and sample-and-hold circuits.

The technique, dynamic quadrature offset cancellation, removes

key sources of the output drift induced by temperature and pack-

age stress. This offset reduction technique is based on a signal

modulation-demodulation process. Figure 10: Model of Chopper

Stabilization Circuit (Dynamic Offset Cancellation) illustrates

how it is implemented.

The undesired offset signal is separated from the magnetically

induced signal in the frequency domain through modulation.

Regulator

Clock/Logic

Low-Pass

Filter

Hall

Element

Sample and

Hold

Amp.

Figure 10: Model of Chopper Stabilization Circuit (Dynamic Oﬀset Cancellation)

15

Allegro MicroSystems

955 Perimeter Road

Manchester, NH 03103-3353 U.S.A.

www.allegromicro.com

APS11800

Two-Wire Hall-Effect Switch with Advanced Diagnostics

POWER DERATING

The device must be operated below the maximum junction

temperature, T_J(max). Reliable operation may require derating

supplied power and/or improving the heat dissipation properties

of the application.

17 mA, calculate the maximum allowable power level, P_D(max).

First, using equation 3:

∆Tꢀ(max)ꢀ=ꢀT_J(max) – T_Aꢀ=ꢀ165°Cꢀ–ꢀ150°Cꢀ=ꢀ15°C

This provides the allowable increase to T_Jresulting from internal

power dissipation. Then, from equation 2:

Thermal Resistance (junction to ambient), R_θJA, is a figure of

merit summarizing the ability of the application and the device to

dissipate heat from the junction (die), through all paths to ambi-

ent air. R_θJAis dominated by the Effective Thermal Conductivity,

K, of the printed circuit board which includes adjacent devices

and board layout. Thermal resistance from the die junction to

case, R_θJC, is a relatively small component of R_θJA. Ambient air

temperature, T_A, and air motion are significant external factors in

determining a reliable thermal operating point.

P_Dꢀ(max)ꢀ=ꢀ∆Tꢀ(max)ꢀ÷ꢀR_θJAꢀ=ꢀ15°Cꢀ÷ꢀ165°C/Wꢀ=ꢀ91ꢀmW

Finally, using equation 1, solve for maximum allowable V_CCfor

the given conditions:

V

_CC(est) = P_Dꢀ(max)ꢀ÷ꢀI_CCꢀ(max)ꢀ=ꢀ91ꢀmWꢀ÷ꢀ17ꢀmAꢀ=ꢀ5.4ꢀV

The result indicates that, at T_A, the application and device can

dissipate adequate amounts of heat at voltages ≤ V_CC(est).

The following three equations can be used to determine operation

points for given power and thermal conditions.

If the application requires V_CC> V_CC(est)then R_θJAmust by

improved. This can be accomplished by adjusting the layout,

PCB materials, or by controlling the ambient temperature.

P_D= V_IN× I_IN

∆Tꢀ=ꢀP_D× R_θJA

T_J= T_Aꢀ+ꢀ∆Tꢀꢀ

(1)

(2)

(3)

Determining Maximum T_A

ꢀ

In cases where the V_CC(max) level is known, and the system

designer would like to determine the maximum allowable ambi-

ent temperature T_A(max), for example, in a worst-case scenario

with conditions V_CC(max) = 24 V, I_CC(max) = 17 mA, and R_θJA

= 228°C/W for the LH package using equation 1, the largest pos-

sible amount of dissipated power is:

For example, given common conditions: T_A= 25°C, V_CC= 12 V,

I_CC= 17 mA, and R_θJA= 110°C/W for the LH package, then:

P_D= V_CC× I_CC= 12 V × 17 mA = 204 mW

ꢀ

∆Tꢀ=ꢀP_D× R_θJA= 204 mW × 110°C/W = 22.44°C

T_J= T_Aꢀ+ꢀ∆Tꢀ=ꢀ25°Cꢀ+ꢀ22.44°Cꢀ=ꢀ47.44°C

P_D= V_IN× I_IN

P_D= 24 V × 17 mA = 408 mW

Determining Maximum V_CC

Then, by rearranging equation 3 and substituting with equation 2:

For a given ambient temperature, T_A, the maximum allow-

able power dissipation as a function of V_CCcan be calculated.

P_D(max) represents the maximum allowable power level without

exceeding T_J(max) at a selected R_θJAand T_A.

T_A(max) = T_Jꢀ(max)ꢀ–ꢀΔT

T_Aꢀ(max)ꢀ=ꢀ165°Cꢀ–ꢀ(408ꢀmWꢀ×ꢀ228°C/W)

T_Aꢀ(max)ꢀ=ꢀ165°Cꢀ–ꢀ93°Cꢀ=ꢀ72°C

Example: V_CCat T_A= 150°C, package UA, using low-K PCB.

Finally, note that the T_A(max) rating of the device is 150°C and

performance is not guaranteed above this temperature for any

power level.

Using the worst-case ratings for the device, specifically: R_θJA

=

165°C/W, T_J(max) = 165°C, V_CC(max) = 24 V, and I_CC(max) =

16

Allegro MicroSystems

955 Perimeter Road

Manchester, NH 03103-3353 U.S.A.

www.allegromicro.com

APS11800

Two-Wire Hall-Effect Switch with Advanced Diagnostics

PACKAGE OUTLINE DRAWINGS

+0.125

–0.75

2.975

3

D

1.49

4°±4°

A

+0.020

–0.053

0.180

D

0.96

D

+0.10

2.90

+0.19

–0.06

2.40

1.91

–0.20

0.70

0.25 MIN

1.00

2

1

0.55 REF

0.25 BSC

0.95

PCB Layout Reference View

Seating Plane

Gauge Plane

B

Branded Face

8× 10° ±5°

1.00 ±0.13

+0.10

XXX

1

0.05

–0.05

C

Standard Branding Reference View

0.95 BSC

0.40 ±0.10

Line 1 = Three digit assigned brand number

For reference only; not for tooling use (reference DWG-0000628, Rev. 1).

Dimensions in millimeters.

Dimensions exclusive of mold flash, gate burrs, and dambar protrusions.

Exact case and lead configuration at supplier discretion within limits shown.

Active Area Depth, 0.28 ±0.04 mm

A

B

Reference land pattern layout

All pads a minimum of 0.20 mm from all adjacent pads; adjust as necessary

to meet application process requirements and PCB layout tolerances

C

D

Branding scale and appearance at supplier discretion

Hall element, not to scale

Figure 11: Package LH, 3-Pin SOT23W

17

Allegro MicroSystems

955 Perimeter Road

Manchester, NH 03103-3353 U.S.A.

www.allegromicro.com

APS11800

Two-Wire Hall-Effect Switch with Advanced Diagnostics

For Reference Only – Not for Tooling Use

(Reference DWG-0000619, Rev. 1)

NOT TO SCALE

Dimensions in millimeters

Dimensions exclusive of mold ﬂash, gate burrs, and dambar protrusions

Exact case and lead conﬁguration at supplier discretion within limits shown

+0.08

4.09

–0.05

45°

B

C

E

2.04 NOM

1.52 ±0.05

10°

1.44 NOM

E

Ejector Pin

Flash Protrusion

+0.08

3.02

–0.05

45°

Branded

Face

0.79 REF

A

1.02

MAX

NNN

1

2

3

Standard Branding Reference View

D

= Supplier emblem

N = Last three digits of device part number

14.99 ±0.25

+0.03

–0.06

0.41

+0.05

–0.07

0.43

Dambar removal protrusion (6×)

Mold gate protrusion zone

A

ꢀ

ꢁ

D

Active Area Depth, 0.50 mm ±0.08

Branding scale and appearance at supplier discretion

Hall element (not to scale)

E

1.27 NOM

Figure 12: Package UA, 3-Pin SIP

18

Allegro MicroSystems

955 Perimeter Road

Manchester, NH 03103-3353 U.S.A.

www.allegromicro.com

APS11800

Two-Wire Hall-Effect Switch with Advanced Diagnostics

Revision History

Number

Date

March 24, 2020

Description

–

Initial release

Allegro MicroSystems 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’s products are not to be used in any devices or systems, including but not limited to life support devices or systems, in which a failure of

Allegro’s product can reasonably be expected to cause bodily harm.

The information included herein is believed to be accurate and reliable. However, Allegro MicroSystems assumes no responsibility for its use; nor

for any infringement of patents or other rights of third parties which may result from its use.

Copies of this document are considered uncontrolled documents.

For the latest version of this document, visit our website:

www.allegromicro.com

19

Allegro MicroSystems

955 Perimeter Road

Manchester, NH 03103-3353 U.S.A.

www.allegromicro.com


型号：	APS11800LUAALT2SL1A
厂家：	ALLEGRO MICROSYSTEMS
描述：	Two-Wire Hall-Effect Switch with Advanced Diagnostics
文件：	总19页 (文件大小：1025K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

APS11800LUAALT2SL1A [ALLEGRO]

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