A1356LKB-T【PDF 9/20 页】IC SENSOR HALL EFFECT 3 SIP

High Precision Linear Hall-Effect Sensor IC

With an Open Drain Pulse Width Modulated Output

A1356

9

Allegro MicroSystems, LLC

115 Northeast Cutoff

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

1.508.853.5000; www.allegromicro.com

Quiescent Duty Cycle Output Programming Resolution

The programming resolution for any device is half of its pro-

gramming step size. Therefore, the typical programming resolu-

tion will be:

Err

PGD(Q)

(typ)

=

0.5 ?/SPAN> Step

D(Q)

(typ)

.

(2)

Quiescent Duty Cycle Output Drift through Tempera-

ture Range Due to internal component tolerances and thermal

considerations, the quiescent Duty Cycle Temperature Coeffi-

cient, D

TC

(Q), may drift from its nominal value over the operat-

ing ambient temperature, T

A

. For purposes of specification, the

Quiescent Duty Cycle Output Drift Through Temperature Range,

D

(Q)

(% D), is defined as:

D

(Q)(TA)

D

(Q)(25癈)

D

(Q)

=

,

(3)

where D

(Q)(TA)

is the quiescent duty cycle measured at T

A

and is

D

(Q)(25癈)

quiescent duty cycle measured at 25癈.

Sensitivity The presence of a south polarity magnetic field,

perpendicular to the branded surface of the package face,

increases the output duty cycle from its quiescent value toward

the maximum duty cycle limit. The amount of the output duty

cycle increase is proportional to the magnitude of the magnetic

field applied. Conversely, the application of a north polarity

field decreases the output duty cycle from its quiescent value.

This proportionality is specified as the magnetic sensitivity,

Sens ((% D)/G), of the device, and it is defined for bipolar

devices as:

D

(BPOS)

D

(BNEG)

BPOS BNEG

Sens =

,

(4)

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

sensitivity range limits: Sens(min) and Sens(max). Refer to the

Guaranteed 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 Qui-

escent Duty Cycle Output Step Size section for a conceptual

explanation.

Sensitivity Programming Resolution Refer to the Quies-

cent Duty Cycle Output Programming Resolution section for a

conceptual explanation.

Carrier Frequency Target The PWM output signal Carrier

Frequency Programming Range, f

PWM

, can be programmed to its

nominal value of 2 kHz.

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

Quiescent Duty Cycle Output Programming Resolution section

for a conceptual explanation.

Sensitivity Temperature Coefficient Device sensitivity

changes as temperature changes, with respect to its programmed

sensitivity temperature coefficient, SENS

TC

. SENS

TC

is pro-

grammed at 150癈, and calculated relative to the nominal

sensitivity programming temperature of 25癈. SENS

TC

(%/癈) is

defined as:

Sens

T2

Sens

T1

Sens

T1

T2T1

1

Sens

TC

=

?SPAN class="pst A1356LKB-T_2172166_2">

100%

,

?/DIV>

(6)

where T1 is the nominal Sens programming temperature of

25癈, and T2 is the programming temperature of 150癈. The

expected value of Sens over the full ambient temperature range,

Sens

EXPECTED(TA)

, is defined as:

Sens

T1

?[100% +Sens

TC

(T

A

T1)]

Sens

EXPECTED(TA)

=

.

100 %

(7)

Sens

EXPECTED (TA)

should be calculated using the actual measured

values of Sens

T1

and SENS

TC

rather than programming target

values.

Sensitivity Drift Through Temperature Range Sec-

ond order sensitivity temperature coefficient effects cause the

magnetic sensitivity, 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 A1356LKB-T_2172166_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.

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