ACS70310 datasheet(6/27 Pages) ALLEGRO

6 / 27 page

Very High Precision, Programmable Linear Hall-Effect Sensor IC

with Reverse Battery Protection and High-Bandwidth (240 kHz)

Analog Output for Core-Based Current Sensing

ACS70310

Allegro MicroSystems

955 Perimeter Road

Manchester, NH 03103-3353 U.S.A.

www.allegromicro.com

Characteristic

Symbol

Test Conditions

Min.

Typ.

Max.

Unit

QUIESCENT OUTPUT VOLTAGE (VOUT(Q))

Number of Fine QVO Programming Bits QVO_FINE

–

bit

Quiescent Output Voltage [3]

VOUT(QU)

Unidirectional, TA = 25°C

0.495

0.5

0.505

VOUT(QBI)

Bidirectional, TA = 25°C

2.495

2.5

2.505

Average Quiescent Voltage Output

Programming Step Size [4]

VOUT(Q)Step TA = 25°C

–

1.18

–

Average Quiescent Voltage Output

Temperature Compensation Step Size VOUT(Q)TCStep

–

VOUT(Q)Step

–

SENSITIVITY (Sens)

Coarse Sensitivity Programming Bits [5] SENS_COARSE Readable by customer

–

bit

Fine Sensitivity Programming Bits

SENS_FINE

–

bit

Sensitivity Programming Range [6]

SensPR

SENS_COARSE = 0

0.5

–

1.2

mV/G

SENS_COARSE = 1

1.2

–

2.5

mV/G

SENS_COARSE = 2

2.5

–

5.5

mV/G

SENS_COARSE = 3

5.5

–

11.5

mV/G

Average Sensitivity Programming

Step Size

StepSENS

SENS_COARSE = 0

–

2.87

–

µV/G

SENS_COARSE = 1

–

6.06

–

µV/G

SENS_COARSE = 2

–

13.06

–

µV/G

SENS_COARSE = 3

–

27.1

–

µV/G

Average Sensitivity Temperature

Compensation Step Size

StepSENSTC TA = –40°C to 150°C

–

StepSENS

–

μV/G

SENSITIVITY ERROR

Factory Sensitivity Error

SensERR

TA = 25°C

–1

–

Sensitivity Drift Over Temperature

ΔSensTC

TA = 25°C to 150°C

–1

–

TA = –40°C to 25°C

–1.2

–

1.2

Sensitvity Non-Linearity Error [7]

LinERR

Measured at 400 G (1, 2.5, and 5 mV/G) or

200 G (10 mV/G)

–0.5

–

0.5

Sensitivity Ratiometry Error

RatERRSENS

VCC = 4.85 to 5.15 V

–0.55

–

0.55

QUIESCENT VOLTAGE OUTPUT ERROR

Factory Quiescent Voltage Output Error

VQVOERR

TA = 25°C

–5

–

Quiescent Voltage Output

Temperature Error

VOUT(Q)TC

TA = 25°C to 150°C

–5

–

TA = –40°C to 25°C

–5

–

Quiescent Voltage Output Ratiometry Error VRatERRVOUT(Q) VCC = 4.85 to 5.15 V

–5

–

LIFETIME

QVO Lifetime Drift

VQVOLife

TA = 25°C

–

0.8

–

Sens Lifetime Drift

SensERR_Life TA = 25°C

–

0.5

–

[1]

Using small RL will increase output error; this error scales with output causing offset and symmetry error, i.e. using a RL = 4.7 kΩ will cause a 4 mV error due to the resis-

tor divider between the RL(pulldown) and the internal resistance of 4 Ω at 5 V output. Keep this in mind when sizing RL.

[2]

Overvoltage Detection was characterized on the bench.

[3]

Devices programed to the typical values are guaranteed to meet the VOUT(Q)TC spec.

[4]

This is an average and actual step can vary. For best results, check QVO after every retrim. Refer to the Quiescent Voltage Output Programming Resolution in the defini-

tion section.

[5]

Allegro guarantees limits of devices that remains within their factory programed SEN_COARSE and the corresponding SENSPR during customer programing.

[6]

Device performance is guaranteed within these ranges.

[7]

LinErr valid from 0 to ±2000 G, validated by characterization and design.

OPERATING CHARACTERISTICS (continued): Valid over full operating temperature range of TA, CBYPASS = 0.1 µF, and

VCC = 5 V, unless otherwise specified

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