A19570LUBBTN-FDWPL-A [ALLEGRO]

Large Air Gap, Vibration-Immune, GMR Transmission Speed and Direction Sensor IC;


型号：	A19570LUBBTN-FDWPL-A
厂家：	ALLEGRO MICROSYSTEMS
描述：	Large Air Gap, Vibration-Immune, GMR Transmission Speed and Direction Sensor IC
文件：	总16页 (文件大小：1453K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

A19570

Large Air Gap, Vibration-Immune,

GMR Transmission Speed and Direction Sensor IC

FEATURES AND BENEFITS

DESCRIPTION

• GMR technology integrates high sensitivity MR

(magnetoresistive) sensor elements and high precision

BiCMOS circuits on a single silicon integrated circuit

offering high accuracy, low magnetic field operation

• Integrated capacitor in a single overmolded miniature

package provides greater EMC robustness

• SolidSpeed Digital Architecture supports advanced

algorithms, maintaining performance in the presence of

extreme system-level disturbances, including vibration

immunity capability over the full target pitch

• Flexible orientation for xMR or Hall replacement and

application installation flexibility

• ASIL B rating based on integrated diagnostics and

certified safety design process

• Two-wire current source output pulse-width protocol

supporting speed, direction, and ASIL

• EEPROM offers device traceability throughout the

production process

The A19570 is a giant magnetoresistance (GMR) integrated

circuit (IC) that provides a user-friendly two-wire solution

for applications where speed and direction information is

required. The small integrated package includes an integrated

capacitor and GMR IC in a single overmolded design with an

additional molded lead stabilizing bar for robust shipping and

ease of assembly.

The GMR-based IC is designed for use in conjunction with

front-biased ring magnet encoders. State-of-the-art GMR

technologywithindustry-leadingsignalprocessingalgorithms

accuratelyswitchinresponsetolow-leveldifferentialmagnetic

signals.ThehighsensitivityofGMRcombinedwithdifferential

sensing offers inherent rejection of interfering common-mode

magnetic fields and valid speed and direction sensing over

largerairgaps,commonlyrequiredintransmissionapplications.

Patented GMR technology allows the same IC orientation as

other MR technologies or the IC can be rotated for Hall-effect

compatibility as a drop-in solution in the application.

IntegrateddiagnosticsareusedtodetectanICfailurethatwould

impact the output protocol’s accuracy, providing coverage

compatiblewithASILBcompliance.Built-inEEPROMscratch

memory offers traceability of the device throughout the IC’s

production process.

SOLIDSPEED

DIGITAL ARCHITECTURE

PACKAGE:

2-Pin SIP

(suffix UB)

The IC is offered in the UB package, which integrates the IC

andahightemperatureceramiccapacitorinasingleovermolded

SIP package for enhanced EMC performance. The 2-pin SIP

package is lead (Pb) free, with tin leadframe plating.

Not to scale

VCC

ADC

Output

–

Current

Generator

ESD

Analog-to-Digital

Front End

Amplification

Digital

Controller

GMR

Elements

and

Signal Conditioning

–

ADC

GND

EEPROM

Oscillator

Diagnostics

Regulator

Figure 1: Functional Block Diagram

A19570-DS

November 14, 2018

MCO-0000525

Large Air Gap, Vibration-Immune,

GMR Transmission Speed and Direction Sensor IC

A19570

SELECTION GUIDE

Conﬁguration Options

A19570 L UBB TN-

ASIL Protocol:

A – ASIL Protocol enabled

[blanked] – ASIL Protocol disabled

Vibration Immunity/Direction Change:

L – No vibration immunity with immediate direction-change detection

H – High vibration immunity

Non-Direction Pulses:

B – Blanked, no output during calibration or vibration

P – Pulses during calibration or vibration

Reverse Pulse Width:

N – 90 µs (narrow)

W – 180 µs (wide)

Number of Pulses:

S – Single, one pulse per pole-pair

D – Dual, one pulse per each N and S pole of a pole-pair

Rotation Direction:

F – Forward rotation, pin 1 to pin 2

R – Forward rotation, pin 2 to pin 1

Instructions (Packing)

Package Designation

Operating Temperature Range

Allegro Identiﬁer and Device Type

SELECTION GUIDE*

Part Number

Packing

Tape and Reel, 4000 pieces per reel

A19570LUBBTN-FSWPH

A19570LUBBTN-RSWPH

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

custom programming options.

Allegro MicroSystems, LLC

955 Perimeter Road

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

www.allegromicro.com

Large Air Gap, Vibration-Immune,

GMR Transmission Speed and Direction Sensor IC

A19570

SPECIFICATIONS

ABSOLUTE MAXIMUM RATINGS

Characteristic

Symbol

Notes

Refer to Power Derating section;

Potential between pin 1 and pin 2

Rating

Unit

Supply Voltage

V_CC

Reverse Supply Voltage

V_RCC

T_A

–18

–40 to 150

165

Operating Ambient Temperature

Maximum Junction Temperature

Storage Temperature

°C

T_J(max)

T_stg

–65 to 170

500

Applied Magnetic Flux Density

In any direction

INTERNAL DISCRETE CAPACITOR RATINGS

Characteristic

Symbol

Test Conditions

Value

Unit

Nominal Capacitance

C_SUPPLY

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

PINOUT DIAGRAM AND TERMINAL LIST

V_CC

A19570

V_OUT= I_CC× R_L

C_L

R_L

Package UB, 2-Pin SIP Pinout Diagram

Terminal List Table

GND

Pin Name

Pin Number

Function

Supply Voltage

Ground

VCC

GND

Figure 2: Application Circuit

Allegro MicroSystems, LLC

955 Perimeter Road

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

www.allegromicro.com

Large Air Gap, Vibration-Immune,

GMR Transmission Speed and Direction Sensor IC

A19570

OPERATING CHARACTERISTICS: Valid throughout full operating voltage and ambient temperature ranges,

unless otherwise speciﬁed

Characteristic

ELECTRICAL CHARACTERISTICS

Supply Voltage^[2]

Symbol

Test Conditions

Min.

Typ. ^[1]

Max.

Unit

V_CC

I_RCC

Potential between pin 1 and pin 2

V_CC= V_RCC(MAX)

–

Reverse Supply Current^[3]

–10

I_CC= I_CC(MAX)+ 3 mA, T_A= 25°C;

Potential between pin 1 and pin 2

Supply Zener Clamp Voltage

Supply Current

V_Zsupply

–

I_CC(LOW)

I_CC(HIGH)

I_CC(LOW)

Low-current state

High-current state

5.9

8.4

Measured as a ratio of high current to low

current (isothermal)

Supply Current Ratio ^[4]

ASIL Safe State Current

1.9

1.5

–

3.9

–

I_RESET

Refer to Figure 12 (-xxxxx-A variant)

3.5

μs

Refer to Figure 12 (-xxxxx-A variant) (Error

Protocol 1)

t_RESET(EP1)

ASIL Safe State Current Time

Refer to Figure 12 (-xxxxx-A variant) (Error

Protocol 2)

t_RESET(EP2)

–

µs

Voltage measured at terminal 2 in Figure 2;

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

10% and 90% of I_CC(LOW)and I_CC(HIGH)

Output Rise/Fall Time

t_r, t_f

POWER-ON CHARACTERISTICS

Power-On State

POS

t_PO

_CC> V_CC(min), as connected in Figure 2

I_CC(LOW)

–

Power-On Time

V_CC> V_CC(min), as connected in Figure 2 ^[5]

–

OUTPUT PULSE-WIDTH PROTOCOL ^[6]

Forward Pulse Width

t_w(FWD)

-xxNxx variant and -xxWxx variant

-xxNxx variant

μs

104

207

414

Reverse Pulse Width

t_w(REV)

-xxWxx variant

153

306

180

360

-xxNPx variant

Nondirection Pulse Width

t_w(ND)

-xxWPx variant

^[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 Power Derating section.

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

^[4]Supply current ratio is taken as a mean value of I_CC(HIGH)/ I_CC(LOW)

^[5]Time between power-on to I_CCstabilizing. Transitions prior to t_POshould be ignored.

^[6]Pulse width measured at threshold of (I_CC(HIGH)+ I_CC(LOW)) / 2. ASIL Safe State Current Time is measured at the threshold of (I_RESET+ I_CC(LOW)) / 2.

Continued on the next page…

Allegro MicroSystems, LLC

955 Perimeter Road

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

www.allegromicro.com

Large Air Gap, Vibration-Immune,

GMR Transmission Speed and Direction Sensor IC

A19570

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

unless otherwise speciﬁed

Characteristic

Symbol

Test Conditions

Min.

Typ. ^[1]

Max.

Unit

INPUT CHARACTERISTICS AND PERFORMANCE

Operating Frequency, Forward

Rotation ^[7]

f_FWD

-xSxxx variant

–

kHz

-xSNxx variant

-xSWxx variant

-xSNPx variant

-xSWPx variant

–

kHz

Operating Frequency, Reverse

Rotation ^[7]

f_REV

Operating Frequency, Nondirection

Pulses ^[7]

f_ND

2.2

Minimum allowable for switching in Parallel

Orientation (refer to Figure 8)

–

Operating Differential Magnetic Input ^[8]B_DIFF(pk-pk)

Minimum allowable for switching in

Perpendicular Orientation (refer to Figure 9)

–50

–

Operating Differential Magnetic Range ^[8]

B_DIFF

Refer to Figure 6

B_SEQ(n+1)

B_SEQ(n)

Signal period-to-period variation (refer to Figure 3)

200

Allowable Differential Sequential

Signal Variation

B_SEQ(n+i)

B_SEQ(n)

Overall signal variation (run-out) (refer to Figure 3)

–

200

Operate Point

Release Point

Target Pitch

B_OP

B_RP

% of peak-to-peak IC-processed signal

Arc length of each pole-pair (at 0 mm air gap)

Required amount of amplitude separated

–

T_PITCH

1.4

Switch Point Separation

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

occurrence. (refer to Figure 5)

–

%pk-pk

THERMAL CHARACTERISTICS

Magnetic Temperature Coefficient^[9]

Package Thermal Resistance

Valid for full temperature range based on ferrite

Single-layer PCB with copper limited to solder pads

–

0.2

–

%/°C

°C/W

R_θJA

213

^[7]Maximum Operating Frequency is determined by satisfactory separation of output pulses: I_CC(LOW)of t_w(FWD)(min). If the customer can resolve shorter low-state durations, maximum f_REV

and f_NDmay be increased.

^[8]Differential magnetic field is measured for the Channel A (E1-E3) and Channel B (E2-E4). Each channel’s differential magnetic field is measured between two GMR elements spaced by

1.4 mm. Magnetic field is measured in the By direction (Refer to Figure 7). To maintain optimal performance, it is recommended that the |Bx| field be less than 80 G.

^[9]Ring magnet decreases strength with rising temperature, and the device compensates. Note that B_DIFF(pk-pk)requirement is not influenced by this.

Continued on the next page…

Allegro MicroSystems, LLC

955 Perimeter Road

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

www.allegromicro.com

Large Air Gap, Vibration-Immune,

GMR Transmission Speed and Direction Sensor IC

A19570

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

unless otherwise speciﬁed

Characteristic

Symbol

Test Conditions

Min.

Typ. ^[1]

Max.

Unit

PERFORMANCE CHARACTERISTICS

2 ×

T_CYCLE

-xSxxH variant

-xSxxL variant

-xSxxH variant

-xSxxL variant

-xSxxH variant

-xSxxL variant

-xSxxH variant

-xSxxL variant

-xSxxH variant

-xSxxL variant

-xSxxH variant

-xSxxL variant

–

Vibration Immunity Startup

Err_VIB(SU)

0.06 ×

T_CYCLE

2 ×

T_CYCLE

Vibration Immunity Running Mode

First Direction Output Pulse ^[10]

Err_VIB

0.03 ×

T_CYCLE

4 ×

T_CYCLE

–

4 ×

T_CYCLE

4 ×

T_CYCLE

First Direction-Pulse Output Following

Direction Change ^[10]

1.75 ×

T_CYCLE

4.25 ×

T_CYCLE

First Direction-Pulse Output Following

Startup Mode Vibration ^[10]

3.75 ×

T_CYCLE

4.25 ×

T_CYCLE

First Direction-Pulse Output Following

Running Mode Vibration ^[10]

3.75 ×

T_CYCLE

^[10]Power-up frequencies ≤ 1 kHz. Rotational frequencies above 1 kHz may require more input magnetic cycles until output edges are achieved.

Target

B _SEQ(n)

B _{SEQ(n + 1)}

T_CYCLE

B _SEQ(n+i), i ≥ 2

B_DIFF

T_CYCLE= Target Cycle; the amount of rotation that

moves one north pole and one south pole

across the sensor

B_DIFF= Differential Input Signal; the differential magnetic

flux density sensed by the sensor

Figure 3: Diﬀerential Signal Variation

Figure 4: Deﬁnition of T_CYCLE

Allegro MicroSystems, LLC

955 Perimeter Road

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

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Large Air Gap, Vibration-Immune,

GMR Transmission Speed and Direction Sensor IC

A19570

T_CYCLE

B_DIFF(SP)

B_DIFF(BOP)

(B_OP

)

Channel B

B_DIFF(pk-pk)

(B_RP

)

B_DIFF(BRP)

B_DIFF(SP)

Channel A

B_DIFF(SP)

B_DIFF(pk-pk)

B_DIFF(SP-SEP)

Figure 5: Deﬁnition of Switch Point Separation

ꢁ_{ꢂꢃꢄꢄꢅMAꢊꢆ}

Aꢈꢈlied ꢁ_ꢂꢃꢄꢄ

ꢁ_{ꢂꢃꢄꢄꢅꢈꢉ-ꢈꢉꢆ}

0 ꢀ

ꢁ_{ꢂꢃꢄꢄꢅMꢃNꢆ}

ꢇime

Figure 6: Input Signal Deﬁnition

Allegro MicroSystems, LLC

955 Perimeter Road

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

www.allegromicro.com

Large Air Gap, Vibration-Immune,

GMR Transmission Speed and Direction Sensor IC

A19570

FUNCTIONAL DESCRIPTION

The A19570 sensor IC contains a single-chip GMR circuit that

uses spaced elements. These elements are used in differential

pairs to provide electrical signals containing information regard-

ing speed and direction of target rotation. The A19570 is intended

for use with ring magnet targets.

Installation Orientation Flexibility

The A19570 can be installed in a parallel, perpendicular, or any

orientation in between with respect to the ring magnet. Refer to

Figure 7, Figure 8, and Figure 9 for parallel and perpendicular

orientations of the sensor.

The IC detects the peaks of the magnetic signals and sets

dynamic thresholds based on these detected signals.

ꢀꢁ

ꢀy

ꢀꢂ

Pin 1

Figure 7: Package Orientation

Pin 1

Rotation

Pin 1

Figure 9: Perpendicular Orientation

Figure 8: Parallel Orientation

Allegro MicroSystems, LLC

955 Perimeter Road

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

www.allegromicro.com

Large Air Gap, Vibration-Immune,

GMR Transmission Speed and Direction Sensor IC

A19570

Forward Rotation. For the -Fxxxx variant, when the target is

rotating such that a target feature passes from pin 1 to pin 2, this

Data Protocol Description

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

face of the package case), the A19570 generates an output pulse

for each magnetic pole-pair (-xSxxx variant) of the target. 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.

is referred to as forward rotation. This direction of rotation is

indicated on the output by a t_W(FWD)pulse width. For the -Rxxxx

variant, forward direction is indicated for target rotation from pin

2 to 1.

Reverse Rotation. For the -Fxxxx variant, when the target

is rotating such that a target feature passes from pin 2 to pin 1,

this is referred to as reverse rotation. This direction of rotation is

indicated on the output by a t_W(REV)pulse width. For the -Rxxxx

variant, reverse direction is indicated for target rotation from pin

1 to 2.

Output edges are triggered by B_DIFFtransitions through the

switchpoints. On a crossing, the output pulse of I_CC(HIGH)is pres-

Pacꢇage Case ꢀranded ꢈace

Device Orientation to Target

ent for t_w(FWD)or t_w(REV)

ꢀꢁ

ꢅPin ꢄ Sideꢆ

Channel ꢀ

ꢂꢃ ꢂ3 ꢂꢄ ꢂ1

ꢅPin 1 Sideꢆ

The IC is always capable of properly detecting input signals up to

the defined operating frequency. At frequencies beyond the oper-

ational frequency specifications (refer to Operational Frequency

specifications noted on page 5), the I_CC(HIGH)pulse duration will

collide with subsequent pulses.

ꢅꢋoꢌ ꢍiew oꢎ

Pacꢇage Caseꢆ ꢂlement Pitch

Channel A

ꢂlement Pitch

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

ꢋarget

ꢋhis ꢌole

sensed later

ꢋhis ꢌole

sensed earlier

ꢅRadial Ring Magnetꢆ

ꢂ

ꢃ

Target Magnetic Profile

Channel

ꢂlement Pitch

ꢉꢀ

ꢊꢀ

I_CC(HIGH)

t_W(FWD)

IC Internal Differential Analog Signals, B_DIFF

ꢀ_ꢁP

I_CC(LOW)

Channel A

ꢀ_RP

ꢀ_ꢁP

Channel ꢀ

Figure 11: Output Timing Example (-xSxxx variant)

ꢀ_RP

Detected Channel Switching

Channel A

Channel ꢀ

Device Output Signal

ꢏ_{CCꢅHꢏꢐHꢆ}

ꢏ_{CCꢅLꢁꢑꢆ}

Figure 10: Basic Operation

Allegro MicroSystems, LLC

955 Perimeter Road

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

www.allegromicro.com

Large Air Gap, Vibration-Immune,

GMR Transmission Speed and Direction Sensor IC

A19570

ASIL Safe State Output Protocol

The A19570 sensor IC contains diagnostic circuitry that will

continuously monitor occurrences of failure defects within the IC.

Refer to Figure 12 for the output protocol of the ASIL safe state

after an internal defect has been detected. Error Protocol 1 will

result from faults due to overfrequency conditions from the input

signal. Error Protocol 2 will result from hard failures detected

within the A19570 such as a regulator and front end fault.

Note: If a fault exists continuously, the device will stay in perma-

nent safe state. Refer to the A19570 Safety Manual for additional

details on the ASIL Safe State Output Protocol.

Magnetic

ꢀncoder

ꢀ

ꢁ

ꢀ

ꢁ

ꢀ

ꢁ_{CCꢂHꢁꢃHꢄ}

Normal

ꢅꢋeration

ꢁ_{CCꢂLꢅꢆꢄ}

ꢁ_{CCꢂHꢁꢃHꢄ}

ꢀrror

Protocol 1

ꢁ_{CCꢂLꢅꢆꢄ}

ꢁ_RꢀSꢀꢇ

ꢈirst ꢉirection ꢅꢊtꢋꢊt Pꢊlse

t_{RꢀSꢀꢇꢂꢀP1ꢄ}

ꢁ_{CCꢂHꢁꢃHꢄ}

ꢀrror

Protocol ꢌ

ꢁ_{CCꢂLꢅꢆꢄ}

ꢁ_RꢀSꢀꢇ

ꢈirst ꢉirection Pꢊlse ꢅꢊtꢋꢊt

t_{RꢀSꢀꢇꢂꢀPꢌꢄ}

Figure 12: Output Protocol of the -xxxBx-A Variant (ASIL Safe State)

Allegro MicroSystems, LLC

955 Perimeter Road

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

www.allegromicro.com

Large Air Gap, Vibration-Immune,

GMR Transmission Speed and Direction Sensor IC

A19570

Calibration and Direction Validation

When power is applied to the A19570, the built-in algorithm per-

forms an initialization routine. For a short period after power-on,

the device calibrates itself and determines the direction of target

rotation. For the -xxxPx variant, the output transmits nondirection

pulses during calibration (Figure 13). For the -xxxBx variant, the

output does not transmit any pulses during calibration.

Once the calibration routine is complete, the A19570 will trans-

mit accurate speed and direction information.

Target Rotation

Target

Differential

Magnetic

Profile

t_W(FWD)or

t_W(REV)

t_W(FWD)or

t_W(REV)

t_W(FWD)or

t_W(REV)

t_W(FWD)or

t_W(REV)

t_W(FWD)or

t_W(REV)

t_W(FWD)or

t_W(REV)

t_W(FWD)or

t_W(REV)

t_W(FWD)or

t_W(REV)

t_W(ND)

Opposite

north pole

t_W(ND)

Opposite

N→S boundary

Opposite

south pole

t_W(ND)

Opposite

S→N boundary

Device Location at Power-On

Figure 13: Calibration Behavior of the -xSxPH Variant

Allegro MicroSystems, LLC

955 Perimeter Road

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Large Air Gap, Vibration-Immune,

GMR Transmission Speed and Direction Sensor IC

A19570

Direction Changes, Vibrations, and

Anomalous Events

During normal operation, the A19570 will be exposed to changes The -xxxPx variant may transmit non-direction pulses during

in the direction of target rotation (Figure 14), vibrations of the

target (Figure 15), and anomalous events such as sudden air

gap changes. These events cause temporary uncertainty in the

A19570’s internal direction detection algorithm.

vibrations, and the -xxxBx variant will not transmit any pulses

during vibrations.

Direc�on

Change

Forward

Reverse

Rota�on

Target Diﬀeren�al

Magne�c Proﬁle

t_W(FWD)

t_W(REV)

I_CC

-xSxBH variant

-xSxPH variant

t_W(FWD)

t_W(ND)

Figure 14: Direction Change Behavior

Vibraꢀon

Target Rotaꢀon

Target Diﬀerenꢀal

Magneꢀc Proﬁle

t_W(FWD)

[or t_W(REV)

t_W(FWD)

[or t_W(REV)

t_W(FWD)

[or t_W(REV)

t_W(FWD)

-xSxPH variant

-xSxBH variant

]

I_CC

t_W(ND)

[or t_W(REV)

]

[or t_W(REV)

]

[or t_W(REV)]

Figure 15: Vibration Behavior

Allegro MicroSystems, LLC

955 Perimeter Road

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

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Large Air Gap, Vibration-Immune,

GMR Transmission Speed and Direction Sensor IC

A19570

POWER DERATING

The device must be operated below the maximum junction

temperature 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.

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

R_θJA= 213°C/W (subject to change), T_J(max)= 165°C, V_CC(max)

= 24 V, and I_CC(AVG)= 15.4 mA. I_CC(AVG)is computed using

I_{CC(HIGH)(max)}and I_CC(LOW)(max), with a duty cycle of 92%

computed from t_w(ND)(max)on-time and t_w(FWD)(min)off-time

(pulse-width protocol). This condition happens at a select limited

frequency.

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 relatively small component of R_θJA. Ambient air temperature,

T_A, and air motion are significant external factors, damped by

overmolding.

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

invert equation 3:

ΔT_maxꢀ=ꢀT_J(max)ꢀ–ꢀT_Aꢀ=ꢀ165°Cꢀ–ꢀ150°Cꢀ=ꢀ15ꢀ°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, P_D) can

be estimated. The following formulas represent the fundamental

relationships used to estimate T_J, at P_D.

_D(max)ꢀ=ꢀΔT_max÷ R_θJAꢀ=ꢀ15°Cꢀ÷ꢀ213°C/Wꢀ=ꢀ70.4ꢀmWꢀ

Finally, invert equation 1 with respect to voltage:

_CC(est)= P_D(max)÷ I_CC(max)ꢀ=ꢀ70.4ꢀmWꢀ÷ꢀ15.4ꢀmAꢀ=ꢀ4.6ꢀVꢀ

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

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

P_D= V_IN× I_IN

ΔTꢀ=ꢀP_D× R_θJA

T_Jꢀ=ꢀT_Aꢀ+ꢀΔTꢀꢀ

(1)

(2)

(3)

ꢀ

For example, given common conditions such as:

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.

T_A= 25°C, V_CC= 12 V, R_θJA= 213°C/W, and I_CC= 7.15 mA,

then:

P_D= V_CC× I_CC= 12 V × 7.15 mA = 85.8 mW

ΔTꢀ=ꢀP_D× R_θJAꢀ=ꢀ85.8ꢀmWꢀ×ꢀ213°C/Wꢀ=ꢀ18.3°C

T_Jꢀ=ꢀT_Aꢀ+ꢀΔTꢀ=ꢀ25°Cꢀ+ꢀ18.3°Cꢀ=ꢀ43.3°C

Allegro MicroSystems, LLC

955 Perimeter Road

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

www.allegromicro.com

Large Air Gap, Vibration-Immune,

GMR Transmission Speed and Direction Sensor IC

A19570

Power Derating Curve

ꢃ5

ꢃꢄ

ꢃ3

ꢍ

CCꢈmaꢋꢊ

ꢃꢃ

ꢃ1

ꢃ0

1ꢂ

1ꢁ

1ꢀ

1ꢄ

1ꢃ

1-layer PCꢒ, Pacꢓage Uꢒ

ꢈR_θꢎAꢏ ꢃ13ꢉCꢐꢑꢊ

ꢂ

ꢁ

ꢀ

ꢄ

ꢍ

CCꢈminꢊ

ꢃ

ꢃ0

ꢄ0

ꢀ0

ꢂ0

100

1ꢃ0

1ꢄ0

1ꢀ0

1ꢂ0

ꢅemꢆeratꢇre ꢈꢉCꢊ

Power Dissipation versus Ambient Temperature

1900

1ꢄ00

1ꢃ00

1ꢂ00

1500

1ꢁ00

1300

1ꢀ00

1100

1000

900

1-layer PCꢑ, Pacꢒage Uꢑ

ꢈR_θꢍAꢎ ꢀ13ꢏCꢐꢌꢊ

ꢄ00

ꢃ00

ꢂ00

500

ꢁ00

300

ꢀ00

100

ꢀ0

ꢁ0

ꢂ0

ꢄ0

100

1ꢀ0

1ꢁ0

1ꢂ0

1ꢄ0

ꢅemꢆeratꢇre ꢈꢉCꢊ

Allegro MicroSystems, LLC

955 Perimeter Road

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

www.allegromicro.com

Large Air Gap, Vibration-Immune,

GMR Transmission Speed and Direction Sensor IC

A19570

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

–0.05

4.00

4×10°

1.50 ±0.05

0.84

0.56

1.02

0.56

1.39

Mold Ejector

Pin Indent

XXXXX

Date Code

Lot Number

+0.06

4.00

–0.07

45°

Branded

Face

Standard Branding Reference View

0.42 ±0.05

0.85 ±0.05

Line 1ꢀ 5 characters

Lines ꢁ, 3ꢀ 5 characters

4 × 2.50 ±0.10

0.25 REF

0.30 REF

2.54 REF

Line 1ꢀ Part Nꢂmꢃer

Line ꢁꢀ ꢄ-digit date code

Line 3ꢀ Characters 5, ꢅ, ꢆ, ꢇ oꢈ

Assemꢃly Lot Nꢂmꢃer

ꢉꢊceꢋtion allowed ꢈor ꢋarts with

mꢂltiꢋle ꢋacꢌage ꢍariantsꢀ

Line 1ꢀ Last ꢄ digits oꢈ ꢋart nꢂmꢃer ꢋlꢂs

Pacꢌage ꢎariant

18.00 ±0.10

12.20 ±0.10

4 × 7.37 REF

1.00 ±0.05

+0.07

–0.03

0.25

1.80 ±0.10

Dambar removal protrusion (8×)

Gate and tie burr area

Active Area Depth, 0.38 ±0.03 mm

0.38 REF

0.25 REF

Branding scale and appearance at supplier discretion

GMR elements (E1, E2, E3, and E4); not to scale

Molded Lead Bar for preventing damage to leads during shipment

4 × 0.85 REF

0.85 ±0.05

+0.06

–0.07

1.80

+0.06

4.00

1.50 ±0.05

–0.05

Figure 16: Package UB, 2-Pin SIP

Allegro MicroSystems, LLC

955 Perimeter Road

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

www.allegromicro.com

Large Air Gap, Vibration-Immune,

GMR Transmission Speed and Direction Sensor IC

A19570

Revision History

Number

Date

Description

–

November 14, 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

Allegro MicroSystems, LLC

955 Perimeter Road

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

www.allegromicro.com

A19570LUBBTN-FDWPL-A [ALLEGRO]

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