A1351LKTTN-T【PDF 10/24 页】IC SENSOR HALL EFFECT 4-SIP

A1351

High Precision Linear Hall Effect Sensor IC

with a Push/Pull, Pulse Width Modulated Output

9

Allegro MicroSystems, Inc.

115 Northeast Cutoff

Worcester, Massachusetts 01615-0036 U.S.A.

1.508.853.5000; www.allegromicro.com

and for unipolar devices as:

D

(BPOS)

D

(Q)

BPOS

Sens

=

,

(5)

where BPOS and BNEG are two magnetic fields with opposite

polarities.

Guaranteed Sensitivity Range The magnetic sensitivity, Sens,

can be programmed around its nominal value within the sensitiv-

ity range limits: Sens(min) and Sens(max). Refer to the Guaran-

teed Quiescent Duty Cycle Output Range section for a conceptual

explanation of how value distributions and ranges are related.

Average Sensitivity Step Size Refer to the Average Quiescent

Duty Cycle Output Step Size section for a conceptual explana-

tion.

Sensitivity Programming Resolution Refer to the Quiescent

Duty Cycle Output Programming Resolution section for a con-

ceptual explanation.

Carrier Frequency Programming Range The PWM output sig-

nal carrier frequency, f

PWM

,can be programmed around its nomi-

nal value within the carrier frequency range limits, f

PWM

(min)

and f

PWM

(max). Refer to the Guaranteed Quiescent Duty Cycle

Output Range section for a conceptual explanation of how value

distributions and ranges are related.

Average Carrier Frequency Step Size Refer to the Average

Quiescent Duty Cycle Output Step Size section for a conceptual

explanation.

Carrier Frequency Programming Resolution Refer to the Qui-

escent Duty Cycle Output Programming Resolution section for a

conceptual explanation.

Sensitivity Temperature Coefficient Device sensitivity changes

as temperature changes, with respect to its programmed sensitiv-

ity temperature coefficient, TC

SENS

. TC

SENS

is programmed at

125癈, and calculated relative to the nominal sensitivity program-

ming temperature of 25癈. TC

SENS

(%/癈) is defined as:

Sens

T2

Sens

T1

Sens

T1

T2T1

1

TC

Sens

=

?SPAN class="pst A1351LKTTN-T_2172462_2">

100%

,

?/DIV>

(6)

where T1 is the nominal Sens programming temperature of 25癈,

and T2 is the TC

SENS

programming temperature of 125癈. The

ideal value of Sens over the full ambient temperature range,

Sens

EXPECTED(TA)

, is defined as:

Sens

T1

[1 + TC

SENS

(T

A

T1) / 100%]

Sens

EXPECTED(TA)

=

(7)

Sens

EXPECTED(TA)

should be calculated using the actual measured

values of Sens

T1

and TC

SENS

rather than programming target values.

Sensitivity Drift Through Temperature Range Second order

sensitivity temperature coefficient effects cause the magnetic sen-

sitivity, Sens, to drift from its expected value over the operating

ambient temperature range, T

A

. For purposes of specification, the

sensitivity drift through temperature range, Sens

TC

, is defined

as:

Sens

TA

Sens

EXPECTED(TA)

Sens

EXPECTED(TA)

Sens

TC

=

?SPAN class="pst A1351LKTTN-T_2172462_2">

100% .

(8)

Sensitivity Drift Due to Package Hysteresis Package stress and

relaxation can cause the device sensitivity at T

A

= 25癈 to change

during and after temperature cycling.

For purposes of specification, the sensitivity drift due to package

hysteresis, Sens

PKG

, is defined as:

Sens

(25癈)2

Sens

(25癈)1

Sens

(25癈)1

Sens

PKG

=

?SPAN class="pst A1351LKTTN-T_2172462_2">

100% ,

(9)

where Sens

(25癈)1

is the programmed value of sensitiv-

ity at T

A

= 25癈, and Sens

(25癈)2

is the value of sensitivity at

T

A

= 25癈, after temperature cycling T

A

up to 125癈, down to

40癈, and back to up 25癈.

Linearity Sensitivity Error The 1351 is designed to provide a

linear output in response to a ramping applied magnetic field.

Consider two magnetic fields, B1 and B2. Ideally, the sensitivity

of a device is the same for both fields, for a given supply voltage

and temperature. Linearity error is present when there is a differ-

ence between the sensitivities measured at B1 and B2.

Linearity Error is calculated separately for the positive

(Lin

ERRPOS

) and negative (Lin

ERRNEG

) applied magnetic fields.

Linearity error (%) is measured and defined as:

Sens

BPOS2

Sens

BPOS1

Sens

BNEG2

Sens

BNEG1

1

Lin

ERRPOS

=

?SPAN class="pst A1351LKTTN-T_2172462_2">

100%

,

?/DIV>

1

Lin

ERRNEG

=

?SPAN class="pst A1351LKTTN-T_2172462_2">

100% ,

?/DIV>

(10)

where:

|D

(Bx)

D

(Q)

|

B

x

Sens

Bx

=

,

(11)

and B

POSx

and B

NEGx

are positive and negative magnetic fields,

with respect to the quiescent voltage output such that

B

POS2

= 2 ?B

POS1

and B

NEG2

= 2 譈

NEG1

. Then:

Lin

ERR

max( Lin

ERRPOS

, Lin

ERRNEG

)

=

.

(12)

Note that unipolar devices only have positive linearity error,

Lin

ERRPOS

.

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