Fully Integrated, Hall Effect-Based Linear Current Sensor with

2.1 kVRMS Voltage Isolation and a Low-Resistance Current Conductor

ACS712

3

Allegro MicroSystems, Inc.

115 Northeast Cutoff

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

1.508.853.5000; www.allegromicro.com

VCC

(Pin 8)

(Pin 7)

VIOUT

R

F(INT)

GND

(Pin 5)

FILTER

(Pin 6)

IP+

(Pin 1)

IP+

(Pin 2)

IP

−

(Pin 3)

IP

−

(Pin 4)

Sense

Trim

Signal

Recovery

Sense Temperature

Coefficient Trim

0 Ampere

Offset Adjust

Hall Current

Drive

+5 V

IP+

IP+

IP–

IP–

VCC

VIOUT

FILTER

GND

1

2

3

4

8

7

6

5

Terminal List Table

Number

Name

Description

1 and 2

IP+

Terminals for current being sensed; fused internally

3 and 4

IP–

Terminals for current being sensed; fused internally

5

GND

Signal ground terminal

6

FILTER

Terminal for external capacitor that sets bandwidth

7

VIOUT

Analog output signal

8

VCC

Device power supply terminal

Functional Block Diagram

Pin-out Diagram