High Bandwidth, Fast Fault Response Current Sensor IC

In Thermally Enhanced Package

ACS709

3

Allegro MicroSystems, Inc.

115 Northeast Cutoff

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

1.508.853.5000; www.allegromicro.com

IP–

VZCR

FILTER

GND

VIOUT

Drain

IP+

FAULT

Signal

Recovery

Trim

Sensitivity

Trim

R

Q

CLK

D

VOC

VCC

POR

FAULT Reset

3 mA

POR

Hall

Bias

Control

Logic

FAULT_EN

+

–

+

–

Fault

Comparator

Hall

Amplifier

1

2

3

4

5

6

7

8

9

10

11

12

24

23

22

21

20

19

18

17

16

15

14

13

IP+

IP+

IP+

IP+

IP+

IP+

IP–

IP–

IP–

IP–

IP–

IP–

NC

NC

FAULT_EN

VOC

VCC

FAULT

VIOUT

FILTER

VZCR

GND

NC

NC

Terminal List Table

Number

Name

Description

1 through 6

IP+

Sensed current copper conduction path pins. Terminals for current being sensed;

fused internally, loop to IP– pins; unidirectional or bidirectional current flow.

7 through 12

IP–

Sensed current copper conduction path pins. Terminals for current being sensed;

fused internally, loop to IP+ pins; unidirectional or bidirectional current flow.

13, 14, 23, 24

NC

No connection

15

GND

Device ground connection.

16

VZCR

Voltage Reference Output pin. Zero current (0 A) reference; output voltage on this

17

FILTER

Filter pin. Terminal for an external capacitor connected from this pin to GND to set

the device bandwidth.

18

VIOUT

Analog Output pin. Output voltage on this pin is proportional to current flowing

through the loop between the IP+ pins and IP– pins.

19

¯F¯¯A¯U¯¯L¯¯T¯

Overcurrent Fault pin. When current flowing between IP+ pins and IP– pins

exceeds the overcurrent fault threshold, this pin transitions to a logic low state.

20

VCC

Supply voltage.

21

VOC

Overcurrent Input pin. Analog input voltage on this pin sets the overcurrent fault

threshold.

22

FAULT_EN Enables overcurrent faulting when high. Resets ¯F¯¯A¯U¯¯L¯¯T¯ when low.

Functional Block Diagram

Pin-out Diagram