Datasheet > A1356

A1356

更新时间： 2022-05-19 13:34:58

品牌	Logo	应用领域
急速微 - ALLEGRO		传感器
页数	文件大小	规格书
20页	451K
描述
High Precision Linear Hall-Effect Sensor

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A1356 数据手册

High Precision Linear Hall-Effect Sensor

With an Open Drain Pulse Width Modulated Output

A1356

For purposes of specification, the Sensitivity Drift Due to Pack-

2 × B_POS1and B_NEG2= 2 × B_NEG1.

age Hysteresis, ∆Sens_PKG, is defined as:

Then:

Sens_(25°C)2– Sens_(25°C)1

100%

∆Sens_PKG

Lin_ERRmax(Lin_ERRPOS, Lin_ERRNEG

)

(9)

(12)

Sens_(25°C)1

where Sens_(25°C)1is the programmed value of sensitivity at T_A=

25°C, and Sens_(25°C)2is the value of sensitivity at T_A= 25°C,

after temperature cycling T_Aup to 150°C, down to –40°C, and

back to up 25°C.

Note that unipolar devices only have positive linearity error

(LIN_ERRPOS).

Symmetry Sensitivity Error The magnetic sensitivity of

A1356 device is constant for any two applied magnetic fields

of equal magnitude and opposite polarities. Symmetry error,

Sym_ERR(%), is measured and defined as:

Linearity Sensitivity Error The A1356 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.



Sens_BPOS

Sens_BNEG







1–

Sym_ERR

100%

(13)







where Sens_Bxis as defined in equation 11, and BPOS and BNEG

are positive and negative magnetic fields such that |BPOS| =

|BNEG|. Note that the symmetry error specification is only valid

for bipolar devices.

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

1–

Lin_ERRPOS

Jitter The duty cycle of the PWM output may vary slightly over

time despite the presence of a constant applied magnetic field and

a constant carrier frequency for the PWM signal. This phenom-

enon is known as jitter, and is defined as:

100%



Sens_BPOS1



Sens







^BNEG2

1–

Lin_ERRNEG





(10)

(11)

Sens



^BNEG1

D_B(max) – D_B(min)

where:

_DC= ±

(14)

|D_(Bx)

–

(Q)

where D_B(max) and D_B(min) are the maximum and minimum

duty cycles at a constant applied magnetic field, B, measured

over 1000 PWM clock periods with a constant applied magnetic

field. J_Dis given in % D.

Sens_Bx

B_x

and B_POSxand B_NEGxare positive and negative magnetic fields,

with respect to the quiescent duty cycle output such that B_POS2

Allegro MicroSystems, Inc.

115 Northeast Cutoff

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

1.508.853.5000; www.allegromicro.com

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