A1359 データシートの表示（PDF） - Allegro MicroSystems

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A1359

Factory-Programmed Dual Output Linear Hall Effect Sensor IC With Analog and Pulse Width Modulated Outputs

Allegro MicroSystems 

A1359

Factory-Programmed Dual Output Linear Hall Effect Sensor IC

With Analog and Pulse Width Modulated Outputs

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 A1359 is 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 differ-

ence between the sensitivities measured at B1 and B2.

Linearity Sensitivity 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 (%)

(6)

where:

SensBx =

|VOUT(Bx) – VOUT(Q)|

Bx

(7)

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:

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

(8)

Clamping Range The output voltage clamps, VCLPH and

VCLPL , limit the operating magnetic range of the applied field in

which the device provides a linear output. The maximum posi-

tive and negative applied magnetic fields in the operating range

can be calculated:

|BPOS(max)| =

VCLP(HIGH) – VOUT(Q)

Sens

|BNEG(max)| =

VOUT(Q) – VCLP(LOW)

Sens

(9)

Symmetry Sensitivity Error The magnetic sensitivity of the

A1359 device is constant for any two applied magnetic fields of

equal magnitude and opposite polarities. Symmetry Sensitivity

Error, SymERR (%), is measured and defined as:

SymERR

= 1–SSeennssBBNPEOGS







× 100

(%)

(10)

where SensBx is as defined in equation 7, and BPOS and

BNEG are positive and negative magnetic fields such that

|BPOS| = |BNEG|.

Ratiometry Error The A1359 provides a ratiometric output.

This means that the quiescent voltage output, VOUT(Q) , mag-

netic sensitivity, Sens, and clamp voltage, VCLPH and VCLPL, 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, RatVOUT(Q)

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

RatERRVOUT(Q)



= 1–



VOUT(Q)(VCC)

VCC

/

/

5VOVUT(Q)(5V)

× 100

(%)

(11)

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

given supply voltage, VCC , is defined as:

RatERRSens

=

1– Sens(VCC) / Sens(5V)

VCC / 5 V

×100 (%)

(12)

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

a given supply voltage, VCC, is defined as:

RatVOUTCLP

=

1– VCLP(VCC) / VCLP(5V)

VCC / 5 V

×100 (%)

(13)

where VCLP is either VCLPH or VCLPL.

Note: Equations 11 and 13 apply to the analog channel (VOUT),

only. Recall that for the PWM output, the 0 G output is 50% from

4.5 to 5.5 V. However, as sensitivity is ratiometric with VCC for

both analog and PWM channels, equation 12 applies to both the

analog and the PWM channels.

Allegro MicroSystems, Inc.

8

115 Northeast Cutoff

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

1.508.853.5000; www.allegromicro.com

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