A1318 datasheet(6/12 Pages) ALLEGRO

Part #	A1318

Description	Linear Hall-Effect Sensor ICs with Analog Output Available in a Miniature, Low Profile Surface Mount Package

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Manufacturer	ALLEGRO [Allegro MicroSystems]

Direct Link	http://www.allegromicro.com

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Linear Hall-Effect Sensor ICs with Analog Output

Available in a Miniature, Low Profile Surface Mount Package

A1318 and

A1319

6

Allegro MicroSystems, LLC

115 Northeast Cutoff

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

1.508.853.5000; www.allegromicro.com

Characteristic Definitions

Power On Time When the supply is ramped to its operating

voltage, the device output requires a finite time to react to an

input magnetic field. Power On Time, tPO , is defined as the time

it takes for the output voltage to begin responding to an applied

magnetic field after the power supply has reached its minimum

specified operating voltage, VCC(min), as shown in figure 1.

Delay to Clamp A large magnetic input step may cause the

clamp to overshoot its steady state value. The Delay to Clamp,

tCLP, is defined as the time it takes for the output voltage to settle

within 1% of its steady state value, after initially passing through

its steady state voltage, as shown in figure 2.

Quiescent Voltage Output In the quiescent state (no signifi-

cant magnetic field: B = 0 G), the output, VOUT(Q), is at a con-

stant ratio to the supply voltage, VCC, across the entire operating

ranges of VCC and Operating Ambient Temperature, TA.

Quiescent Voltage Output Drift Across Temperature

Range Due to internal component tolerances and thermal

considerations, the Quiescent Voltage Output, VOUT(Q), may

drift due to temperature changes within the Operating Ambient

Temperature, TA. For purposes of specification, the Quiescent

Voltage Output Drift Across Temperature Range, ∆V

OUT(Q) (mV),

is defined as:

∆V

OUT(Q)

VOUT(Q)(TA) –VOUT(Q)(25°C)

=

(1)

Sensitivity The amount of the output voltage change is propor-

tional to the magnitude and polarity of the magnetic field applied.

This proportionality is specified as the magnetic sensitivity,

Sens (mV/G), of the device and is defined as:

VOUT(B+) – VOUT(B–)

(B+) – (B–)

Sens =

(2)

where B+ is the magnetic flux density in a positive field (south

polarity) and B– is the magnetic flux density in a negative field

(north polarity).

Sensitivity Temperature Coefficient The device sensitivity

changes as temperature changes, with respect to its Sensitivity

Temperature Coefficient, TCSENS. TCSENS is programmed at

150°C, and calculated relative to the baseline sensitivity program-

ming temperature of 25°C. TCSENS is defined as:

SensT2 – SensT1

SensT1

T2–T1

1

TCSens =

×100

(%/°C)

























(3)

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

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

The ideal value of Sens across the full ambient temperature

range, SensIDEAL(TA), is defined as:

SensT1 × [100 (%) + TCSENS (TA –T1)]

SensIDEAL(TA) =

(4)

Sensitivity Drift Across Temperature Range Second order

sensitivity temperature coefficient effects cause the magnetic

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

ambient temperature range, TA. For purposes of specification,

V

+t

VCC

VCC(min)

VOUT

90% VOUT

0

t1= time at which power supply reaches

minimum specified operating voltage

t2= time at which output voltage settles

within ±10% of its steady state value

under an applied magnetic field

t1

t2

tPO

VCC(typ)

time (µs)

Magnetic Input Signal

t1= time at which output voltage initially

reaches steady state clamp voltage

t2= time at which output voltage settles to

within 1% of steady state clamp voltage

VCLPHIGH

t1

t2

tCLP

VOUT

Figure 1. Definition of Power On Time, tPO

Figure 2. Definition of Delay to Clamp, tCLP

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