A1384EUATI-T データシートの表示（PDF） - Allegro MicroSystems

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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

Quiescent Voltage Output Drift Through Temperature Range

Due to internal component tolerances and thermal considerations,

the quiescent voltage output, VOUT(Q), may drift from its nominal

value over the operating ambient temperature, TA. For purposes

of specification, the Quiescent Voltage Output Drift Through

Temperature Range, ∆VOUT(Q) (mV), is defined as:

∆VOUT(Q) = VOUT(Q)(TA) –VOUT(Q)(25°C) .

(3)

Sensitivity The presence of a south polarity magnetic field, per-

pendicular to the branded surface of the package face, increases

the output voltage from its quiescent value toward the supply

voltage rail (assuming that the polarity bit, POL, is in its initial

state of logic 0). The amount of the output voltage increase is

proportional to the magnitude of the magnetic field applied.

Conversely, the application of a north polarity field decreases the

output voltage from its quiescent value. This proportionality is

specified as the magnetic sensitivity, Sens (mV/G), of the device,

and it is defined as:

Sens = VOUT(BPOS) – VOUT(BNEG) ,

(4)

BPOS – BNEG

where BPOS and BNEG are two magnetic fields with opposite

polarities.

Guaranteed Sensitivity Range The magnetic sensitivity, Sens,

can be programmed around its nominal value, 2.5 to 7.5 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, TCSENS. TCSENS is programmed at

150°C, and calculated relative to the nominal sensitivity program

ming temperature of 25°C. TCSENS (%/°C) is defined as:

TCSens

=

⎜⎜⎝⎛SensSTe2n–sTS1ensT1

×

⎞

100%⎟⎟

⎠

⎜⎜⎝⎛T21–T1⎟⎟⎠⎞

,

(5)

where T1 is the nominal Sens programming temperature of 25°C,

and T2 is the TCSENS programming temperature of 150°C.

The ideal value of Sens over the full ambient temperature range,

SensIDEAL(TA), is defined as:

SensIDEAL(TA) = SensT1 [100% + TCSENS (TA –T1)] (6)

Guaranteed Sensitivity Temperature Coefficient Range The

magnetic sensitivity temperature coefficient can be programmed

within its limits: TCSens(max) and TCSens(min). Refer to the

Guaranteed Quiescent Voltage Output Range section for a con-

ceptual explanation of how value distributions and ranges are

related.

Average Sensitivity Temperature Coefficient Step Size Refer

to the Average Quiescent Voltage Output Step Size section for a

conceptual explanation.

Sensitivity Temperature Coefficient Programming Resolution

Refer to the Quiescent Voltage Output Programming Resolution

section for a conceptual explanation.

Sensitivity Drift Through Temperature Range Second order

sensitivity temperature coefficient effects cause the magnetic

sensitivity, Sens, to drift from its ideal value over the operating

ambient temperature range, TA. For purposes of specification, the

sensitivity drift through temperature range, ∆SensTC, is defined

as:

∆SensTC

=

SensTA – SensIDEAL(TA)

SensIDEAL(TA)

×100%

.

(7)

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.

Allegro MicroSystems, Inc.

8

115 Northeast Cutoff, Box 15036

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

www.allegromicro.com

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