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A1384EUATI-T

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

Allegro MicroSystems 

A1381, A1382,

A1383, and A1384

Programmable Linear Hall Effect Sensors with Analog Output

Available in a Miniature Thin Profile Surface Mount Package

For purposes of specification, the sensitivity drift due to package

hysteresis, ∆SensPKG, is defined as:

∆SensPKG =

Sens(25°C)2 – Sens(25°C)1

Sens(25°C)1

×

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:

LinERRPOS

=

⎛

⎜⎜1–

⎝

SensBPOS2

SensBPOS1

⎞

⎟⎟

⎠

×100%

,

LinERRNEG

=

⎛

⎜⎜1–

⎝

SSeennssBBNNEEGG12⎟⎟⎠⎞

×100%

,

(9)

where:

SensBx

=

|VOUT(Bx) –

Bx

VOUT(Q)|

,

(10)

and BPOSx and BNEGx are positive and negative magnetic fields,

with respect to the quiescent voltage output such that

|BPOS2| > |BPOS1| and |BNEG2| > |BNEG1|. Then:

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

SymERR

=

⎛

⎜⎜1–

⎝

SensBPOS

SensBNEG

⎞

⎟⎟ ×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:

⎛

RatERRVOUT(Q) = ⎜⎜1–

⎝

VOUT(Q)(VCC)

VCC

/

/

5VOVUT(Q)(5V)⎟⎟⎠⎞

×100%

.

(13)

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

a given supply voltage, VCC, is defined as:

RatERRSens

=

⎛

⎜⎜1–

⎝

Sens(VCC) / Sens(5V)

VCC / 5 V

⎞

⎟⎟

⎠

×100%

.

(14)

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

given supply voltage, VCC, is defined as:

LinERR = max( |LinERRPOS | , |LinERRNEG | ) . (11)

Symmetry Sensitivity Error The magnetic sensitivity of an

A138x device is constant for any two applied magnetic fields of

RatERRCLP

=

⎛

⎜⎜1–

⎝

VCLP(VCC) / VCLP(5V)

VCC / 5 V

⎞

⎟⎟

⎠

×

100%

.

(15)

equal magnitude and opposite polarities.

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

Allegro MicroSystems, Inc.

9

115 Northeast Cutoff, Box 15036

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

www.allegromicro.com

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