A1361LKTTN-T【PDF 11/26 页】IC HALL EFFECT SENSOR LN 4-SIP

A1360, A1361,

and A1362

Guaranteed Sensitivity Range The magnetic sensitivity, Sens,

can be programmed around its nominal value, 0.7 to 16 mV/G

depending on device type, within the sensitivity range limits:

Sens(min) and Sens(max). Refer to the Guaranteed Quiescent

Voltage Output Range section for a conceptual explanation of

how value distributions and ranges are related.

Average Sensitivity Step Size Refer to the Average Quiescent

Voltage Output Step Size section for a conceptual explanation.

Sensitivity Programming Resolution Refer to the Quiescent

Voltage 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

150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 A1361LKTTN-T_2172721_2">

100%

,

?/DIV>

(6)

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

and T2 is the TC

SENS

programming temperature of 150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 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 A1361LKTTN-T_2172721_2">

100%

,

(8)

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 150癈, down to

40癈, and back to up 25癈.

Linearity Sensitivity Error The 136x family is designed to

provide a linear output in response to a ramping applied magnetic

field. Consider two magnetic fields, B1 and B2. Ideally, the sen-

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

voltage and temperature. Linearity error is present when there is a

difference 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 A1361LKTTN-T_2172721_2">

100%

,

?/DIV>

1

Lin

ERRNEG

=

?SPAN class="pst A1361LKTTN-T_2172721_2">

100% ,

?/DIV>

(9)

where:

|V

OUT(Bx)

V

OUT(Q)

|

B

x

Sens

Bx

=

,

(10)

and B

POSx

and B

NEGx

are positive and negative magnetic fields,

with respect to the quiescent voltage output such that

|B

POS2

| = 2 讄B

POS1

| and |B

NEG2

| = 2 讄B

NEG1

|. Then:

Lin

ERR

max( Lin

ERRPOS

, Lin

ERRNEG

)

=

.

(11)

Note that unipolar devices only have positive linearity error,

Lin

ERRPOS

.

Low-Noise Programmable Linear Hall Effect Sensor ICs with

Adjustable Bandwidth (50 kHz Maximum) and Analog Output

11

Allegro MicroSystems, LLC

115 Northeast Cutoff

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

1.508.853.5000; www.allegromicro.com

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