ACS764 datasheet(4/22 Pages) ALLEGRO

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Fully Integrated, Hall-Effect Based Current Sensor IC with I2C

Digital Output and Low-Resistance Current Conductor

ACS764

Allegro MicroSystems, LLC

115 Northeast Cutoff

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

1.508.853.5000; www.allegromicro.com

OPERATING CHARACTERISTICS1 Valid throughout an ambient temperature range of –20°C to 125°C, CBYPASS = 0.1 μF,

VCC = 3.3 V, unless otherwise noted

Characteristics

Symbol

Test Conditions

Min.

Typ.

Max.

Unit

Electrical Characteristics

Supply Voltage

VCC

3.0

–

3.6

Supply Current

ICC

No load on SDA and SCL

–

Power-On Time

tPO

TA = 25°C; CBYPASS = open

–

μs

Internal Bandwidth

BWi

Small signal –3 dB; TA = 25°C

–

kHz

Leadframe Resistance

IP+ to IP– through primary current path

–

0.5

–

mΩ

Current Sensing Range Selection

Current Sensing Range2,3

CSR

[GAIN_RANGE] = 10b

–

[GAIN_RANGE] = 11b

–

[GAIN_RANGE] = 00b

–

[GAIN_RANGE] = 01b

–

Nominal Resolution3

RES

[GAIN_RANGE] = 10b

–

15.66

–

mA/LSB

[GAIN_RANGE] = 11b

–

31.31

–

mA/LSB

[GAIN_RANGE] = 00b

–

62.62

–

mA/LSB

[GAIN_RANGE] = 01b

–

125.24

–

mA/LSB

Output Signal Characteristics

A-to-D Conversion Resolution

ResADC

–9–

bit

A-to-D Conversion Time

tADC

–

375 × N–

μs

Average Quantity of Data Points

Included in Moving Average

Calculation4

[N7:N0]=[0000 0000] through [1111 1111]

represents 1 data point through 256 data points

–

256

data point

Analog Noise

INOISE(rms)(A) TA = 25°C

–

Analog Noise Density

INOISE(den)(A) TA = 25°C

–

0.27

–

mA/Hz1/2

A-to-D Linear Range5

ADCLIN

–

496

ADC

Code

Digital Noise

INOISE(rms)(D) TA = 25°C

–

INOISE(rms)(A)

/ N1/2

–mA

Accuracy Performance

Offset Error

ErrOS

GAIN_RANGE set for optimized CSR, ADC

code is within ADCLIN; measured at 2 A;

TA = 25°C to 125°C

–8

±5

LSB

GAIN_RANGE set for optimized CSR; ADC

code is within ADCLIN; measured at 2 A;

TA = –20°C to 25°C

–15

±7

+15

LSB

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