A1381LLHLT-T datasheet(9/18 Pages) ALLEGRO

Part #	A1381LLHLT-T

Description	Programmable Linear Hall Effect Sensors with Analog Output Available in a Miniature Thin Profile Surface Mount Package

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Manufacturer	ALLEGRO [Allegro MicroSystems]

Direct Link	http://www.allegromicro.com

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9 / 18 page

Programmable Linear Hall Effect Sensor ICs with Analog Output

Available in a Miniature Thin Profile Surface Mount Package

A1381, A1382,

A1383, and A1384

9

Allegro MicroSystems, Inc.

115 Northeast Cutoff, Box 15036

Worcester, Massachusetts 01615-0036 (508) 853-5000

www.allegromicro.com

For purposes of specification, the sensitivity drift due to package

hysteresis, ∆SensPKG, is defined as:

Sens

(25°C)2 – Sens(25°C)1

Sens

(25°C)1

∆Sens

PKG =

×100% ,

(8)

where Sens(25°C)1 is the programmed value of sensitivity at TA

= 25°C, and Sens(25°C)2 is the value of sensitivity at TA = 25°C,

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

back to up 25°C.

Linearity Sensitivity Error

The 138x 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

(LinERRPOS) and negative (LinERRNEG) applied magnetic fields.

Linearity error (%) is measured and defined as:

Sens

BPOS2

Sens

BPOS1

Sens

BNEG2

Sens

BNEG1

1–

Lin

ERRPOS =

×100% ,

⎟⎟

⎠

⎞

⎜⎜

⎝

⎛

1–

Lin

ERRNEG =

×100% ,

⎟⎟

⎠

⎞

⎜⎜

⎝

⎛

(9)

where:

|V

OUT(Bx) – VOUT(Q)|

Bx

Sens

Bx =

,

(10)

and BPOSx and BNEGx are positive and negative magnetic fields,

with respect to the quiescent voltage output such that

Lin

ERR

max( |LinERRPOS | , |LinERRNEG | )

=

. (11)

Symmetry Sensitivity Error

The magnetic sensitivity of an

A138x device is constant for any two applied magnetic fields of

equal magnitude and opposite polarities.

Symmetry error, SymERR (%), is measured and defined as:

Sens

BPOS

Sens

BNEG

1–

Sym

ERR =

×100% ,

⎟⎟

⎠

⎞

⎜⎜

⎝

⎛

(12)

where SensBx is as defined in equation 10, and BPOS and BNEG

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

Ratiometry Error

The A138x devices feature ratiometric output.

This means that the quiescent voltage output, VOUT(Q), magnetic

sensitivity, Sens, and clamp voltage, VCLP(HIGH) and VCLP(LOW),

are proportional to the supply voltage, VCC. In other words, when

the supply voltage increases or decreases by a certain percent-

age, each characteristic also increases or decreases by the same

percentage. Error is the difference between the measured change

in the supply voltage relative to 5 V, and the measured change in

each characteristic.

The ratiometric error in quiescent voltage output, RatERRVOUT(Q)

(%), for a given supply voltage, VCC, is defined as:

V

OUT(Q)(VCC) / VOUT(Q)(5V)

V

CC / 5 V

1–

Rat

ERRVOUT(Q) =

×100% .

⎟⎟

⎠

⎞

⎜⎜

⎝

⎛

(13)

The ratiometric error in magnetic sensitivity, RatERRSens (%), for

a given supply voltage, VCC, is defined as:

Sens

(VCC) / Sens(5V)

V

CC / 5 V

1–

Rat

ERRSens =

×100% .

⎟⎟

⎠

⎞

⎜⎜

⎝

⎛

(14)

The ratiometric error in the clamp voltages, RatERRCLP (%), for a

given supply voltage, VCC, is defined as:

V

CLP(VCC) / VCLP(5V)

V

CC / 5 V

1–

Rat

ERRCLP =

×100% .

⎟⎟

⎠

⎞

⎜⎜

⎝

⎛

(15)

where VCLP is either VCLP(HIGH) or VCLP(LOW).

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