A19520LUBBTN-FSILBYKG-A

A19520

Vibration-Tolerant Hall-Effect

Transmission Speed and Direction Sensor IC

FEATURES AND BENEFITS

DESCRIPTION

• Differential Hall-effect sensor measures ring magnets

and ferrous targets with inherent stray field immunity

• SolidSpeed Digital Architecture™ provides robust,

adaptive performance with advanced algorithms that

provide vibration immunity over the full target pitch

• Integrated solution includes a capacitor in a single

overmolded miniature package

• ISO 26262:2011 ASIL B with integrated diagnostics and

certified safety design process

• Two-wire current source output pulse-width protocol

supporting speed, direction, and ASIL error reporting

• EEPROM enables factory traceability

The A19520 is an advanced vibration-tolerant Hall-effect

integrated circuit (IC) that measures the speed and direction

of rotating targets. This sensor IC can directly measure ring

magnets or be back-biased with a magnet to measure ferrous

targets. The package features an integrated capacitor for

electromagnetic compatibility (EMC).

The A19520 employs intelligent algorithms that allow stable

operation during vibration and highly dynamic air gap

environmentscommontotransmissionapplications.Inaddition,

the A19520 differential sensing offers inherent rejection of

interfering common-mode magnetic fields.

TheIChasbeendesignedtoacertifiedISO26262:2011design

processtoalloweasyintegrationintohighsafetylevelsystems.

Integrated diagnostics are used to detect an IC failure that

impacts the output protocol’s accuracy, providing coverage

compatible with ASIL B compliance.

2

-

PACKAGE:

2-Pin SIP

(suffix UB)

The A19520 is provided in a 2-pin miniature SIP package

(suffix UB) that is lead (Pb) free, with tin leadframe plating.

The UB package includes an IC and capacitor integrated into

a single overmolded package, with an additional molded

lead-stabilizing bar for robust shipping and ease of assembly.

Not to scale

VCC

+

ADC

Output

-

Digital

Controller

Current

ESD

Generator

Analog-to-Digital

Front End

and

Amplification

Signal Conditioning

+

ADC

-

GND

Regulator

EEPROM

Diagnostics

+

Oscillator

-

Functional Block Diagram

A19520-DS

December 17, 2018

MCO-0000530

Vibration-Tolerant Hall-Effect

Transmission Speed and Direction Sensor IC

A19520

SELECTION GUIDE*

Part Number

Packing

A19520LUBBTN-FSNHPYUE-A

A19520LUBBTN-RSNHPYUE-A

A19520LUBBTN-FSNHPYUE

A19520LUBBTN-RSNHPYUE

Tape and reel, 4000 pieces per reel

* Not all combinations are available. Contact Allegro sales for availability and pricing of custom

programming options.

Conﬁguration Options

A19520

L

UBB

TN-

ASIL Protocol:

-A ASIL protocol enabled

[blank] – ASIL protocol disabled

Magnetic Temperature Compensation:

E

0.16%/°C

G – 0.04%/°C

Extended Sudden Air Gap:

K – Timed resets enabled

U – Feature not enabled

Calibration Mode Non-Direction Pulses:

O – Blanked, no output during Calibration

Y – Pulses allowed during Calibration

Running Mode Non-Direction Pulses:

B – Blanked, no output during Running mode

P – Pulses allowed during Running mode

Vibration Immunity / Direction Change:

L – Low vibration immunity with immediate direction change detection

H – High vibration immunity

Pulse Widths (Typical):

I – Intermediate, Forward = 60 µs, Reverse = 120 µs, Non-Direction = 30 µs

N – Narrow, Forward = 45 µs, Reverse = 90 µs, Non-Direction = 180 µs

W –Wide, Forward = 45 µs, Reverse = 180 µs, Non-Direction = 360 µs

Number of Pulses:

S – Single, one pulse per magnetic pole pair

Rotation Direction:

F – Forward, pin 1 to pin 2

R – Forward, pin 2 to pin 1

Packing Instructions

Package Designation

Operating Temperature Range

Allegro Identiﬁer and Device Type

2

Allegro MicroSystems, LLC

955 Perimeter Road

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

www.allegromicro.com

Vibration-Tolerant Hall-Effect

Transmission Speed and Direction Sensor IC

A19520

ABSOLUTE MAXIMUM RATINGS

Characteristic

Symbol

V_CC

Notes

Rating

28

Unit

V

Supply Voltage

Refer to Power Derating section

Reverse Supply Voltage

Operating Ambient Temperature

Maximum Junction Temperature

Storage Temperature

V_RCC

T_A

–18

V

–40 to 150

165

°C

T_J(max)

T_stg

–65 to 170

INTERNAL DISCRETE CAPACITOR RATINGS

Characteristic

Symbol

Test Conditions

Value (Typ.)

Unit

Nominal Capacitance

C_SUPPLY

Connected between pin 1 and pin 2 (refer to Figure 1)

10

nF

PINOUT DIAGRAM AND TERMINAL LIST

V_SUPPLY

1

2

A19520

IC

2

UB Package, 2-Pin SIP Pinout Diagram

C_L

R_L

Terminal List Table

GND

Name

Number

Function

VCC

1

2

Supply Voltage

Ground

Figure 1: Typical Application Circuit

GND

3

Allegro MicroSystems, LLC

955 Perimeter Road

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

www.allegromicro.com

Vibration-Tolerant Hall-Effect

Transmission Speed and Direction Sensor IC

A19520

OPERATING CHARACTERISTICS: Valid throughout full operating and temperature ranges, unless otherwise speciﬁed

Characteristic

GENERAL

Symbol

Test Conditions

Min.

Typ. ^[1]

Max.

Unit

Operating, T_J< T_J(max), voltage across pin 1 and

pin 2; does not include voltage across R_L

Supply Voltage ^[2]

V_CC

4

–

24

V

Undervoltage Lockout

V_CC(UV)

I_RCC

V_CC0 V → 5 V or 5 V → 0 V

V_CC= V_RCC(max)

–

3.6

–

3.95

–

V

Reverse Supply Current ^[3]

–10

5.9

12

mA

I_CC(LOW)

Low-current state

7

8

I_CC(HIGH)High-current state

14

16

Supply Current

I_CC(HIGH)

I_CC(LOW)

/

Ratio of high current to low current (isothermal)

Refer to Figure 15

1.9

1.5

–

ASIL Safety Current

I_RESET

3.9

mA

PROTECTION CIRCUITS

Supply Zener Clamp Voltage

POWER-ON CHARACTERISTICS

Power-On State

V_Zsupply

I_CC= 19 mA, T_A= 25°C

28

–

1

V

POS

t_PO

V

_CC> V_CC(min), as connected in Figure 1

I_CC(LOW)

–

mA

ms

Time from V_CC> V_CC(min), until device has

entered calibration

Power-On Time ^[4]

OUTPUT PULSE CHARACTERISTICS, PULSE PROTOCOL ^[5]

Voltage measured at pin 2 in Figure 1,

Output Rise Time

Output Fall Time

t_r

R_L= 100 Ω, C_L= 10 pF, measured between

10% and 90% of signal

0

2

4

μs

Voltage measured at pin 2 in Figure 1,

R_L= 100 Ω, C_L= 10 pF, measured between

10% and 90% of signal

Pulse Width, ASIL Warning

Pulse Width, ASIL Critical

t_w(ASILwarn)Refer to Figure 15

t_w(ASILcrit)Refer to Figure 15

63

4

–

121

8

μs

ms

Continued on next page...

4

Allegro MicroSystems, LLC

955 Perimeter Road

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

www.allegromicro.com

Vibration-Tolerant Hall-Effect

Transmission Speed and Direction Sensor IC

A19520

OPERATING CHARACTERISTICS (continued): Valid throughout full operating temperature ranges,

unless otherwise speciﬁed

Characteristic

Symbol

Test Conditions

Min.

Typ. ^[1]

Max.

Unit

INTERMEDIATE PULSE WIDTH OPTION (PART NUMBER -xxIxxxxx)

Threshold to Enter High-Speed Mode

Threshold to Exit High-Speed Mode

Pulse Width, Forward Rotation

Pulse Width, Reverse Rotation

Pulse Width, High-Speed

f_HIGH

f_LOW

T_CYCLEfrequency increasing

T_CYCLEfrequency decreasing

T_CYCLEfrequency < f_LOW

T_CYCLEfrequency > f_HIGH

0.935

0.850

51

1.1

1

1.265

1.150

69

kHz

μs

t_w(FWD)

t_w(REV)

t_w(HS)

t_w(ND)

60

120

30

102

25

138

35

μs

Pulse Width, Non-Direction

25

35

μs

Operating Frequency,

Forward Rotation ^[6][7][8]

f_FWD

f_REV

f_ND

0

̶

12

kHz

Operating Frequency,

[6][7][8]

Reverse Rotation

Operating Frequency,

Non-Direction Pulses ^[6][8]

NARROW PULSE WIDTH OPTION (PART NUMBER -xxNxxxxx)

Pulse Width, Forward Rotation

Pulse Width, Reverse Rotation

Pulse Width, Non-Direction

t_w(FWD)

t_w(REV)

t_w(ND)

38

76

45

90

52

μs

104

207

153

180

Operating Frequency,

Forward Rotation ^[6][8]

f_FWD

f_REV

f_ND

0

̶

12

7

kHz

Operating Frequency,

Reverse Rotation ^[6][8]

Operating Frequency,

Non-Direction Pulses ^[6][8]

4

WIDE PULSE WIDTH OPTION (PART NUMBER -xxWxxxxx)

Pulse Width, Forward Rotation

Pulse Width, Reverse Rotation

Pulse Width, Non-Direction

t_w(FWD)

t_w(REV)

t_w(ND)

38

45

52

μs

153

306

180

360

207

414

Operating Frequency,

Forward Rotation ^[6][8]

f_FWD

f_REV

f_ND

0

̶

12

4

kHz

Operating Frequency,

Reverse Rotation ^[6][8]

Operating Frequency,

Non-Direction Pulses ^[6][8]

2.2

^[1]Typical values are at T_A= 25°C and V_CC= 12 V. Performance may vary for individual units, within the speciﬁed maximum and minimum limits.

^[2]Maximum voltage must be adjusted for power dissipation and junction temperature; see representative for Power Derating discussions.

^[3]Negative current is deﬁned as conventional current coming out of (sourced from) the speciﬁed device terminal.

^[4]Output transients prior to t_POshould be ignored.

^[5]Timing from start of rising output transition. Measured pulse width will vary on load circuit conﬁgurations and thresholds. Pulse width measured at threshold of (I_CC(HIGH)

+ I_CC(LOW)) / 2 for non-ASIL pulses and (I_RESET+ I_CC(LOW)) / 2 for ASIL pulses.

^[6]Maximum Operating Frequency is determined by satisfactory separation of output pulses. If shorter low-state durations can be resolved, the maximum f_REVand f_NDmay

be higher, excluding the -xxIxxxx variant or f_(FWD)as ﬁlter bandwidth limitation applies.

^[7]Direction information is not available when frequency > f_HIGHfor the Intermediate Pulse Width option.

^[8]Zero-speed is not met when the K-variant is implemented due to the inclusion of a timed reset.

5

Allegro MicroSystems, LLC

955 Perimeter Road

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

www.allegromicro.com

Vibration-Tolerant Hall-Effect

Transmission Speed and Direction Sensor IC

A19520

OPERATING CHARACTERISTICS (continued): Valid throughout full operating temperature ranges,

unless otherwise speciﬁed

Characteristic

Symbol

Test Conditions

Min.

Typ. ^[1]

Max.

Unit

INPUT CHARACTERISTICS AND PERFORMANCE

Operating Differential

B_DIFF(pk-pk)Peak-to-peak of differential magnetic input

30

–750

0.7

–

750

1.3

–

G

–

Magnetic Input ^[8]

Operating Differential

Magnetic Range ^[8]

B_DIFF

Differential input signal; refer to Figure 5

B_SEQ(n+1)

B_SEQ(n)

/

Signal cycle-to-cycle variation

(refer to Figure 2)

Allowable Differential Sequential

Signal Variation

B_SEQ(n+i)

B_SEQ(n)

/

Overall signal variation

(refer to Figure 2)

0.1

–

Operate Point

Release Point

B_OP

B_RP

% of peak-to-peak IC-processed signal

Required amount of amplitude separation

–

70

30

–

%

Switch Point Separation

B_DIFF(SP-SEP)between channels at each B_OPand B_RP

occurrence; refer to Figure 4

20

–

%B_DIFF(pk-pk)

Periods after t_POcompleted and first valid speed

4 ×

T_CYCLE

Initial Calibration

T_CAL

and direction output. Constant direction of rotation.

Refer to Figure 3 for definition of t_CYCLE

–

.

High Vibration (-xxxHxxxx variant)

Low Vibration (-xxxLxxxx variant)

High Vibration (-xxxHxxxx variant)

1 × T_CYCLE

–

Vibration Immunity (Startup)

Vibration Immunity (Running Mode)

0.12 ×

T_CYCLE

Low Vibration (-xxxLxxxx variant)

–

THERMAL CHARACTERISTICS

Based on magnetic material makeup

(-xxxxxxxE variant)

–

0.16

0.04

213

–

%/°C

°C/W

Magnetic Temperature Coefficient ^[9]

Package Thermal Resistance ^[10]

T_C

Based on magnetic material makeup

(-xxxxxxxG variant)

Single-layer PCB with copper limited to solder

pads

R_θJA

^[8]Diﬀerential magnetic ﬁeld is measured for Channel A (E1-E2) and Channel B (E2-E3) independently. Refer to Figure 5. Each channel’s diﬀerential magnetic ﬁeld is measured

between two Hall elements with spacing determined by Figure 16. Magnetic ﬁeld is measured orthogonally to the front of the package.

^[9]Magnets and magnetic encoders decrease in magnetic strength with rising temperature. The device temperature coeﬃcient compensates, to help maintain a consistent air

gap over temperature.

^[10]Additional thermal information is available on the Allegro website.

6

Allegro MicroSystems, LLC

955 Perimeter Road

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

www.allegromicro.com

Vibration-Tolerant Hall-Effect

Transmission Speed and Direction Sensor IC

A19520

B _SEQ(n)

Target

S

N

S

N

B _{SEQ(n + 1)}

B _SEQ(n+i), i ≥ 2

T_CYCLE

B_DIFF

B_DIFF= Differential Input Signal; the differential magnetic

flux sensed by the sensor

T_CYCLE= Target Cycle; the amount of rotation that

moves one north pole and one south pole

across the sensor

Figure 2: Diﬀerential Signal Variation

Figure 3: Deﬁnition of T_CYCLE

ꢄ_ꢅꢆꢇꢇ

ꢁ_{ꢂꢃꢄꢄꢅmaꢆꢇ}

S

N

S

N

T_CYCLE

Aꢈꢈlied ꢁ_ꢂꢃꢄꢄ

ꢁ_{ꢂꢃꢄꢄꢅꢈꢉ-ꢈꢉꢇ}

0 ꢀ

B_DIFF(SP)

B_DIFF(BOP)

(B_OP

)

Channel B

B_DIFF(pk-pk)

(B_RP

)

B_DIFF(BRP)

B_DIFF(SP)

Channel A

ꢁ_{ꢂꢃꢄꢄꢅminꢇ}

B_DIFF(SP)

B_DIFF(SP-SEP)

=

ꢀꢁꢂꢃ

B_DIFF(pk-pk)

Figure 5: Diﬀerential Magnetic Input

Figure 4: Deﬁnition of Switch Point Separation

7

Allegro MicroSystems, LLC

955 Perimeter Road

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

www.allegromicro.com

Vibration-Tolerant Hall-Effect

Transmission Speed and Direction Sensor IC

A19520

FUNCTIONAL DESCRIPTION

The A19520 sensor IC contains a single-chip Hall-effect circuit

that supports three Hall elements. These elements are used in

differential pairs to provide electrical signals containing informa-

tion regarding speed, direction of target rotation, and edge posi-

tion. The A19520 is intended for use with ring magnet targets,

or, when back-biased with an appropriate magnet, with ferrous

targets. The IC detects the peaks of the magnetic signals and sets

dynamic thresholds based on these detected signals. Output edges

are triggered by B_DIFFtransitions through the switch points.

General Protocol Description

When a target passes in front of the device (opposite the branded

face of the package case), the sensor IC generates an output pulse

for each magnetic pole-pair of the target or for each tooth-valley

pair. Speed information is provided by the output pulse rate,

while direction of target rotation is provided by the duration of

the output pulses. The sensor IC can sense target movement in

both the forward and reverse directions.

For the “-xxIxxxxx” variant, when in High Speed Mode, output

pulses will be of t_w(HS)duration for either target direction of rota-

tion.

ROTATION DIRECTION

When the target is rotating such that a target feature passes from

pin 1 to pin 2, this is referred to as forward rotation. This direc-

tion of rotation is indicated on the IC output by a t_w(FWD)pulse

width. For the “-Rxxxxxxx” variant, forward direction is indi-

cated for target rotation from pin 2 to 1.

Refer to Figure 6 for target orientation to the device and Figure 7

through Figure 9 for a general output protocol understanding.

Target Rota�on (Forward)

S

N

S

N

S

I_CC(HIGH)

t_w(FWD)

I_CC(LOW)

Figure 7: Output Protocol (-Fxxxxxxx),

No High Speed Mode, Forward Rotation

Target Rota�on (Reverse)

S

N

S

N

S

ꢅranded ꢂace

oꢆ Sensor

Rotating ꢈarget

I_CC(HIGH)

N

S

N

t_w(REV)

N

S

N

S

N

Pin 1

Pin ꢇ

I_CC(LOW)

Figure 8: Output Protocol (-Fxxxxxxx),

No High Speed Mode, Reverse Rotation

ꢀAꢁ ꢂorward Rotation ꢀ-ꢂꢃꢃꢃꢃꢃꢃꢃ ꢄariantꢁ

Target Rota�on (Forward)

or

ꢅranded ꢂace

oꢆ Sensor

Rotating ꢈarget

Target Rota�on (Reverse)

S

N

S

N

S

N

S

N

S

N

S

N

Pin 1

I_CC(HIGH)

Pin ꢇ

ꢀꢅꢁ Reꢄerse Rotation ꢀ-ꢂꢃꢃꢃꢃꢃꢃꢃ ꢄariantꢁ

t_w(HS)

Figure 6: Target Orientation Relative to Device

(ring magnet shown).

I_CC(LOW)

Figure 9: Output Protocol (-xxIxxxxx),

High Speed Mode

8

Allegro MicroSystems, LLC

955 Perimeter Road

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

www.allegromicro.com

Vibration-Tolerant Hall-Effect

Transmission Speed and Direction Sensor IC

A19520

ꢈarget

N

Pacꢆage Case

ꢃranded ꢇace

Pacꢇage Case ꢀranded ꢈace

Device Orientation to Target

ꢁPin 1

Sideꢂ

ꢁꢈoꢉ ꢊiew oꢋ

Pacꢆage Caseꢂ

ꢁPin ꢅ

Sideꢂ

ꢀC

ꢌ3

ꢌ1

ꢆ3

ꢆꢅ

ꢆ1

ꢀꢁ^ꢌꢅ

Pole Piece

ꢂC

ꢃPin ꢅ Sideꢄ

ꢃꢋoꢌ ꢍiew oꢎ

ꢃPin 1 Sideꢄ

ꢁConcentratorꢂ

ꢃacꢆ-ꢃiasing

Rare-ꢌarth Pellet

ꢃ Channel

North Pole

ꢀ Channel

ꢆlement Pitch

A Channel

ꢆlement Pitch

Soꢍth Pole

A Channel

Pacꢇage Caseꢄ

Mechanical Position (Target moves past device pin 1 to pin 2)

ꢋarget

ꢋhis ꢌole

ꢃRadial Ring Magnetꢄ

sensed later

sensed earlier

ꢈhis tooth

sensed later

sensed earlier

ꢁ

ꢀ

ꢁ

Target Magnetic Profile

Channel

ꢆlement Pitch

Target Magnetic Profile

ꢎꢃ

Channel

ꢌlement Pitch

ꢉꢀ

ꢊꢀ

IC Internal Differential Analog Signals, V_PROC

ꢀ_ꢁPꢀ_ꢁP

IC Internal Differential Analog Signals, V_PROC

ꢃ_ꢄP

A Channel

ꢃ_RP

ꢀ_RP

ꢃ_ꢄP

ꢀ_ꢁP

ꢀ Channel

ꢃ Channel

ꢃ_RP

ꢀ_RP

Detected Channel Switching

A Channel

ꢃ Channel

ꢀ Channel

Device Output Signal

CCꢃHighꢄ

ꢀ_CCꢁHighꢂ

ꢂ

ꢀ_CCꢁLowꢂ

CCꢃLowꢄ

Figure 10: Basic Operation

9

Allegro MicroSystems, LLC

955 Perimeter Road

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

www.allegromicro.com

Vibration-Tolerant Hall-Effect

Transmission Speed and Direction Sensor IC

A19520

Startup Detection/Calibration

Direction information is available after calibration is complete.

After proper supply voltage is applied to the IC, the IC detects the

magnetic profile of the rotating target.

Figure 11 and Figure 12 show where the first output edges may

occur for various starting target phases.

The calibration period occurs on the first few features of the

target that pass in front of the IC.

ꢁarget Rotation

ꢀ

ꢁ

ꢀ

ꢁ

ꢀ

ꢁ

ꢀ

ꢁ

ꢀ

ꢁarget

ꢂiꢃꢃerential

Magnetic

Proꢃile

t_{ꢇꢈꢉꢇꢂꢊ}or

t_{ꢇꢈRꢋꢌꢊ}

t_{ꢇꢈꢉꢇꢂꢊ}or

t_{ꢇꢈRꢋꢌꢊ}

t_{ꢇꢈꢉꢇꢂꢊ}or

t_{ꢇꢈRꢋꢌꢊ}

t_{ꢇꢈꢉꢇꢂꢊ}or

t_{ꢇꢈRꢋꢌꢊ}

t_{ꢇꢈꢉꢇꢂꢊ}or

t_{ꢇꢈRꢋꢌꢊ}

t_{ꢇꢈꢉꢇꢂꢊ}or

t_{ꢇꢈRꢋꢌꢊ}

t_{ꢇꢈꢉꢇꢂꢊ}or

t_{ꢇꢈRꢋꢌꢊ}

ꢄꢅꢅosite

north ꢅole

ꢄꢅꢅosite

N→S boundary

ꢀ

CC

ꢄꢅꢅosite

south pole

ꢄꢅꢅosite

t

S→N boundary

ꢂeꢆice Location at Power-ꢄn

Figure 11: Startup Position Eﬀect on First Device Output Switching (-xxxxxOxx variant)

ꢁarget Rotation

ꢀ

ꢁ

ꢀ

ꢁ

ꢀ

ꢁ

ꢀ

ꢁ

ꢀ

ꢁarget

ꢂiꢃꢃerential

Magnetic

Proꢃile

t_{ꢇꢈꢉꢇꢂꢊ}or

t_{ꢇꢈRꢋꢌꢊ}

t_{ꢇꢈꢉꢇꢂꢊ}or

t_{ꢇꢈRꢋꢌꢊ}

t_{ꢇꢈꢉꢇꢂꢊ}or

t_{ꢇꢈRꢋꢌꢊ}

t_{ꢇꢈꢉꢇꢂꢊ}or

t_{ꢇꢈRꢋꢌꢊ}

t_{ꢇꢈꢉꢇꢂꢊ}or

t_{ꢇꢈRꢋꢌꢊ}

t_{ꢇꢈꢉꢇꢂꢊ}or

t_{ꢇꢈRꢋꢌꢊ}

t_{ꢇꢈꢉꢇꢂꢊ}or

t_{ꢇꢈRꢋꢌꢊ}

t_{ꢇꢈNꢂꢊ}

ꢄꢅꢅosite

north ꢅole

t_{ꢇꢈNꢂꢊ}

ꢄꢅꢅosite

N→S boundary

ꢀ

CC

ꢄꢅꢅosite

south pole

t_{ꢇꢈNꢂꢊ}

ꢄꢅꢅosite

t

S→N boundary

ꢂeꢆice Location at Power-ꢄn

Figure 12: Startup Position Eﬀect on First Device Output Switching (-xxxxxYxx variant)

10

Allegro MicroSystems, LLC

955 Perimeter Road

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

www.allegromicro.com

Vibration-Tolerant Hall-Effect

Transmission Speed and Direction Sensor IC

A19520

Vibration Detection

than the specified vibration immunity. Output pulses containing the

Algorithms embedded in the IC’s digital controller detect the pres-

ence of target vibration (oscillation) through analysis of the two

magnetic input channels.

proper direction information will resume when direction informa-

tion is validated on constant target rotation.

With High vibration mode, advanced algorithm detection provides

additional immunity. As shown in Figure 14, the IC may produce

t_NDpulses, depending on the vibration amplitude.

With low vibration option, during any detected vibration, the out-

put is blanked and no output pulses will occur for vibrations less

Normal ꢀarget Rotation

ꢁiꢂration

N

S

N

S

N

S

N

ꢀarget

ꢃiꢄꢄerential

Magnetic

Proﬁle

t_ꢆꢇꢈꢆꢃꢉ

ꢅor t_ꢆꢇRꢊꢁꢉꢋ

t_ꢆꢇꢈꢆꢃꢉ

ꢅor t_ꢆꢇRꢊꢁꢉꢋ

t_ꢆꢇRꢊꢁꢉ

ꢅor t_ꢆꢇꢈꢆꢃꢉꢋ

t_ꢆꢇꢈꢆꢃꢉ

ꢅor t_ꢆꢇRꢊꢁꢉꢋ

t_ꢆꢇꢈꢆꢃꢉ

ꢅor t_ꢆꢇRꢊꢁꢉꢋ

t

Figure 13: Output Functionality in the Presence of

Running Mode Target Vibration – Low Vibration Immunity (-xxxLBxxx variant)

Normal ꢀarget Rotation

ꢁiꢂration

S

N

S

N

S

N

S

N

ꢀarget

ꢃiꢄꢄerential

Magnetic

Proﬁle

t_ꢆꢇꢈꢆꢃꢉ

t_ꢆꢇNꢃꢉ

ꢅor t_ꢆꢇRꢊꢁꢉꢋ

-ꢌꢌꢌHPꢌꢌꢌ

ꢁariant

t_ꢆꢇNꢃꢉ

t_ꢆꢇꢈꢆꢃꢉ

ꢅor t_ꢆꢇRꢊꢁꢉꢋ

t

-ꢌꢌꢌHꢍꢌꢌꢌ

ꢁariant

t_ꢆꢇꢈꢆꢃꢉ

ꢅor t_ꢆꢇRꢊꢁꢉꢋ

t

Figure 14: Output Functionality in the Presence of

Running Mode Target Vibration – High Vibration Immunity (-xxxHxxxx variant)

11

Allegro MicroSystems, LLC

955 Perimeter Road

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

www.allegromicro.com

Vibration-Tolerant Hall-Effect

Transmission Speed and Direction Sensor IC

A19520

ASIL Protocol

The A19520 sensor IC contains diagnostic circuitry that will

continuously monitor occurrences of failure defects within the IC.

Refer to Figure 15 for the output protocol of the ASIL Safe State

after an internal defect has been detected. Error Protocol will result

from faults which cause incorrect signal transmission (i.e., too few

or too many output pulses).

Note: If a fault exists continuously, the device will attempt recov-

ery indefinitely. Refer to the A19520 Safety Manual for additional

details on the ASIL Safe State Output Protocol.

Ring Magnet

S

N

S

N

S

N

S

N

S

N

ꢂ_{CCꢃHꢂꢄHꢅ}

ꢂ_{CCꢃLꢀꢆꢅ}

Normal

ꢀꢁeration

ꢇaꢈlt

ꢂ_{CCꢃHꢂꢄHꢅ}

ꢇaꢈlt

Protocol

ꢂ_{CCꢃLꢀꢆꢅ}

ꢂ_RꢉSꢉꢊ

t_{wꢃASꢂLwarnꢅ}

or

t_Pꢀ

t_{wꢃASꢂLcritꢅ}

Figure 15: Output Protocol (ASIL Safe State)

12

Allegro MicroSystems, LLC

955 Perimeter Road

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

www.allegromicro.com

Vibration-Tolerant Hall-Effect

Transmission Speed and Direction Sensor IC

A19520

POWER DERATING

The device must be operated below the maximum junction tem-

perature of the device (T_J(max)). Under certain combinations of

peak conditions, reliable operation may require derating supplied

power or improving the heat dissipation properties of the appli-

cation. This section presents a procedure for correlating factors

affecting operating T_J. (Thermal data is also available on the

Allegro MicroSystems website.)

A worst-case estimate, P_D(max), represents the maximum allow-

able power level (V_CC(max), I_CC(max)), without exceeding T_J(max)

at a selected R_θJAand T_A.

,

Example: Reliability for V_CCat T_A=150°C, package UB, using

1-layer PCB.

Observe the worst-case ratings for the device, specifically:

R_θJA=213°C/W, T_J(max)=165°C, V_CC(max)= 24 V, and

The Package Thermal Resistance (R_θJA) is a figure of merit sum-

marizing the ability of the application and the device to dissipate

heat from the junction (die), through all paths to the ambient air.

Its primary component is the Effective Thermal Conductivity (K)

of the printed circuit board, including adjacent devices and traces.

Radiation from the die through the device case (R_θJC) is a rela-

tively small component of R_θJA. Ambient air temperature (T_A) and

air motion are significant external factors, damped by overmolding.

I_CC(AVG)= 14.6 mA. I_CC(AVG)is computed using I_{CC(HIGH)(max)}

and I_CC(LOW)(max), with a duty cycle of 83% computed from

t_w(REV)(max)on-time at 4 kHz maximum operating frequency.

Calculate the maximum allowable power level (P_D(max)). First,

invert equation 3:

ΔT_max= T_J(max)– T_A= 165°C–150°C = 15°C

This provides the allowable increase to T_Jresulting from internal

power dissipation. Then, invert equation 2:

The effect of varying power levels (Power Dissipation or P_D), can

be estimated. The following formulas represent the fundamental

relationships used to estimate T_J, at P_D.

P

_D(max)= ΔT_max÷R_θJA=15°C÷213°C/W=70.4mW

Finally, invert equation 1 with respect to voltage:

_CC(est)= P_D(max)÷ I_CC(AVG)= 70.4mW÷14.6mA=4.8 V

P_D= V_IN

I

(1)

(2)

(3)

×

IN

ꢀ

ΔT = P_D

R

×

θJA

V

T_J= T_A+ ΔT

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

dissipate adequate amounts of heat above 6.5 V at 150°C.

For example, given common conditions such as: T_A= 25°C,

V_CC= 12 V, I_CC= 14 mA, and R_θJA= 213°C/W, then:

Compare V_CC(est)to V_CC(max). If V_CC(est)≤ V_CC(max), then reli-

able operation between V_CC(est)and V_CC(max)requires enhanced

R_θJA. If V_CC(est)≥ V_CC(max), then operation between V_CC(est)and

V_CC(max)is reliable under these conditions.

P_D= V_CC

I

= 12 V 14 mA = 168 mW

CC

×

ΔT = P_D

R

= 168 mW 213°C/W = 35.8°C

×

θJA

T_J= T_A+ ΔT = 25°C + 35.8°C = 60.8°C

Power Dissipation versus Ambient Temperature

Power Derating Curve

26

1400

1200

1000

24

22

20

18

16

14

12

10

8

V_CC(max)

800

1-layer PCB, Package UB

(R_θJA= 213°C/W)

600

1-layer PCB, Package UB

(R_θJA= 213°C/W)

400

200

0

6

4

V_CC(min)

80 100 120 140 160 180

2

20

40

60

20

40

60

80

100 120 140 160 180

Temperature (°C)

13

Allegro MicroSystems, LLC

955 Perimeter Road

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

www.allegromicro.com

Vibration-Tolerant Hall-Effect

Transmission Speed and Direction Sensor IC

A19520

PACKAGE OUTLINE DRAWING

For Reference Only – Not for Tooling Use

(Reference DWG-0000408, Rev. 3)

Dimensions in millimeters – NOT TO SCALE

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

Exact case and lead conﬁguration at supplier discretion within limits shown

+0.06

4.00

–0.05

B

4×ꢀ0°

E 1.50

1.50 0.05

1.50 E

0.50 E

C

1.39

E

Mold Ejector

Pin Indent

+0.06

4.00

–0.07

E

E1

E3

E2

E

45°

Branded

Face

19550

Date Code

Lot Number

A

0.85 0.05

0.42 0.05

4 × 2.50 0.ꢀ0

0.25 REF

0.30 REF

2.54 REF

D

Standard Branding Reference View

Lines 1, 2, 3 = Max 5 characters per line

Line 1: 5-digit Part Number

Line 2: 4-digit Date Code

Line 3: Characters 5, 6, 7, 8 of Asembly

Lot Number

ꢀ

2

18.00 0.10

ꢀ2.20 0.ꢀ0

ꢀ.00 0.05

+0.07

0.25

4 × 7.37 REF

ꢀ.80 0.ꢀ0

–0.03

A

B

C

D

E

F

Dambar removal protrusion (8×)

Gate and tie burr area

Active Area Depth, 0.38 mm 0.03

0.38 REF

0.25 REF

Branding scale and appearance at supplier discretion

Hall elements (E1, E2, and E3); not to scale

Molded Lead Bar for preventing damage to leads during shipment

4 × 0.85 REF

0.85 0.05

+0.06

ꢀ.80

–0.07

F

+0.06

4.00

ꢀ.50 0.05

–0.05

Figure 16: Package UB, 2-Pin SIP

14

Allegro MicroSystems, LLC

955 Perimeter Road

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

www.allegromicro.com

Vibration-Tolerant Hall-Effect

Transmission Speed and Direction Sensor IC

A19520

Revision History

Number

Date

Description

–

December 17, 2018

Initial release

Allegro MicroSystems, LLC 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, LLC 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

15

Allegro MicroSystems, LLC

955 Perimeter Road

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

www.allegromicro.com


型号：	A19520LUBBTN-FSILBYKG-A
厂家：	ALLEGRO MICROSYSTEMS
描述：	Vibration-Tolerant Hall-Effect Transmission Speed and Direction Sensor IC
文件：	总15页 (文件大小：883K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

A19520LUBBTN-FSILBYKG-A [ALLEGRO]

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