A1389LLHLX-RP9-T datasheet(7/12 Pages) ALLEGRO

Part #	A1389LLHLX-RP9-T

Description	Linear Hall-Effect Sensor ICs with Analog Output

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Manufacturer	ALLEGRO [Allegro MicroSystems]

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Linear Hall-Effect Sensor ICs with Analog Output

Available in a Miniature, Low Profile Surface Mount Package

A1388 and

A1389

7

Allegro MicroSystems, LLC

115 Northeast Cutoff

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

1.508.853.5000; www.allegromicro.com

defined as:

SensTA – SensIDEAL(TA)

SensIDEAL(TA)

∆Sens

TC =

×100

(%)

(5)

Sensitivity Drift Due to Package Hysteresis Package

stress and relaxation can cause the device sensitivity at TA = 25°C

to change during and after temperature cycling. This change in

sensitivity follows a hysteresis curve. For purposes of specifica-

tion, the Sensitivity Drift Due to Package Hysteresis, ∆Sens

PKG,

is defined as:

Sens(25°C)(2) – Sens(25°C)(1)

Sens(25°C)(1)

∆Sens

PKG =

×100

(%)

(6)

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 A1388 and A1389 are

designed to provide 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 difference between the sensitivities measured at

B1 and B2.

Linearity Sensitivity Error, LINERR , is calculated separately for

positive (LinERR+) and negative (LinERR– ) applied magnetic

fields. LINERR (%) is measured and defined as:

Sens(B+)(2)

Sens(B+)(1)

Sens(B–)(2)

Sens(B–)(1)

1–

LinERR+ =

×100

(%)

×100

(%)













1–

LinERR– =













(7)

where:

|VOUT(Bx) – VOUT(Q)|

Bx

SensBx =

(8)

and Bx are positive and negative magnetic fields, with respect to

the quiescent voltage output, such that

|B(+)(2)| > |B(+)(1)| and |B(–)(2)| > |B(–)(1)|

The effective linearity error is:

max(|LinERR+| , |LinERR– |)

LinERR =

(9)

The output voltage clamps, VCLPHIGH and VCLPLOW, limit the

operating magnetic range of the applied field in which the device

provides a linear output. The maximum positive and negative

applied magnetic fields in the operating range can be calculated:

VCLPHIGH – VOUT(Q)

Sens

B

MAX(+)  =

VOUT(Q) – VCLPLOW

Sens

B

MAX(–)  =

(10)

Symmetry Sensitivity Error The magnetic sensitivity of the

device is constant for any two applied magnetic fields of equal

magnitude and opposite polarities. Symmetry error, SymERR (%),

is measured and defined as:

Sens(B+)

Sens(B–)

1–

SymERR =

×100 (%)













(11)

where SensBx is as defined in equation 10, and B+ and B– are

positive and negative magnetic fields such that |B+| = |B–|.

Ratiometry Error The A1388 and A1389 provide ratiometric

output. This means that the Quiescent Voltage Output, VOUT(Q),

magnetic sensitivity, Sens, and clamp voltages, VCLPHIGH and

VCLPLOW, are proportional to the supply voltage, VCC. In other

words, when the supply voltage increases or decreases by a

certain percentage, 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, RatVOUT(Q)

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

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

VCC / 5 (V)

1–

RatVOUT(Q) =

×100

(%)













(12)

The ratiometric error in magnetic sensitivity, RatSens (%), for a

given supply voltage, VCC, is defined as:

Sens(VCC) / Sens(5V)

VCC / 5 (V)

1–

RatSens =

×100 (%)













(13)

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

a given supply voltage, VCC, is defined as:

VCLP(VCC) / VCLP(5V)

VCC / 5 (V)

1–

RatVOUTCLP =

×100

(%)













(14)

where VCLP is either VCLPHIGH or VCLPLOW.

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