A1354KKTTN-T datasheet(10/22 Pages) ALLEGRO

Part #	A1354KKTTN-T

Description	High Precision 2-Wire Linear Hall Effect Sensor IC with Pulse Width Modulated Output

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Manufacturer	ALLEGRO [Allegro MicroSystems]

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and for unipolar devices as:

D(BPOS) – D(Q)

BPOS

Sens =

,

(5)

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 within the

sensitivity range limits: Sens(min) and Sens(max). Refer to the

Guaranteed Quiescent Duty Cycle Output Range section for a

conceptual explanation of how value distributions and ranges are

related.

Average Sensitivity Step Size Refer to the Average Qui-

escent Duty Cycle Output Step Size section for a conceptual

explanation.

Sensitivity Programming Resolution Refer to the Quies-

cent Duty Cycle Output Programming Resolution section for a

conceptual explanation.

Guaranteed Carrier Frequency Range The PWM output

signal carrier frequency, fPWM, can be programmed around its

nominal value in fast mode or slow mode.

Average Carrier Frequency Step Size Refer to the Average

Quiescent Duty Cycle Output Step Size section for a conceptual

explanation.

Carrier Frequency Programming Resolution Refer to the

Quiescent Duty Cycle Output Programming Resolution section

for a conceptual explanation.

Sensitivity Temperature Coefficient Device Sensitiv-

ity changes as temperature changes, with respect to its pro-

grammed sensitivity temperature coefficient, TCSENS. TCSENS

is programmed at 125°C, and calculated relative to the nominal

sensitivity programming temperature of 25°C. TCSENS (%/°C) is

defined as:

SensT2 – SensT1

SensT1

T2–T1

1

TCSens =

×100%

,

























(6)

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

and T2 is the TCSENS programming temperature of 125°C. The

expected value of Sens over the full ambient temperature range,

SensEXPECTED(TA), is defined as:

SensT1× [100% +TCSENS (TA –T1)]

SensEXPECTED(TA) =

100 %

(7)

SensEXPECTED(TA) should be calculated using the actual measured

values of SensT1 and TCSENS rather than ideal programming

target values.

Sensitivity Drift Through Temperature Range Second

order sensitivity temperature coefficient effects cause the mag-

netic sensitivity, Sens, to drift from its expected value over the

operating ambient temperature range, TA. For purposes of speci-

fication, the sensitivity drift through temperature range, ∆SensTC,

is defined as:

SensTA – SensEXPECTED(TA)

SensEXPECTED(TA)

∆SensTC =

×100% .

(8)

Sensitivity Drift Due to Package Hysteresis Package

stress and stress relaxation can cause the device sensitivity at

TA = 25°C to change during and after temperature cycling.

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

∆SensPKG =

×100% ,

(9)

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 125°C, down to –40°C,

and back to up 25°C.

Linearity Sensitivity Error The A1354 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.

High Precision 2-Wire Linear Hall Effect Sensor IC

with Pulse Width Modulated Output

A1354

10

Allegro MicroSystems, Inc.

115 Northeast Cutoff

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

1.508.853.5000; www.allegromicro.com

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