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ACS716

120 kHz Bandwidth, High Voltage Isolation Current Sensor with Integrated Overcurrent Detection

Allegro MicroSystems 

ACS716

120 kHz Bandwidth, High Voltage Isolation

Current Sensor with Integrated Overcurrent Detection

Features and Benefits

▪ Industry-leading noise performance with greatly improved

bandwidth through proprietary amplifier and filter design

techniques

▪ Small footprint package suitable for space-constrained

applications

▪ 1 mΩ primary conductor resistance for low power loss

▪ High isolation voltage, suitable for line-powered

applications

▪ User-adjustable Overcurrent Fault level

▪ Overcurrent Fault signal typically responds to an

overcurrent condition in < 2 μs

▪ Integrated shield virtually eliminates capacitive coupling

from current conductor to die due to high dV/dt voltage

transients

▪ Filter pin capacitor improves resolution in low bandwidth

applications

▪ 3 to 3.6 V, single supply operation

▪ Factory trimmed sensitivity and quiescent output voltage

▪ Chopper stabilization results in extremely stable quiescent

output voltage

▪ Ratiometric output from supply voltage

Package: 16-pin SOIC Hall Effect IC

Package (suffix LA)

Approximate Scale 1:1

Description

The Allegro™ ACS716 current sensor provides economical

and precise means for current sensing applications in industrial,

commercial, and communications systems. The device is offered

in a small footprint surface mount package that allows easy

implementation in customer applications.

TheACS716 consists of a precision linear Hall sensor integrated

circuit with a copper conduction path located near the surface

of the silicon die. Applied current flows through the copper

conduction path, and the analog output voltage from the Hall

sensor linearly tracks the magnetic field generated by the

applied current. The accuracy of the ACS716 is maximized

with this patented packaging configuration because the Hall

element is situated in extremely close proximity to the current

to be measured.

High level immunity to current conductor dV/dt and stray

electric fields, offered by Allegro proprietary integrated shield

technology, results in low ripple on the output and low offset

drift in high-side, high voltage applications.

The voltage on the Overcurrent Input (VOC pin) allows

customers to define an overcurrent fault threshold for the device.

When the current flowing through the copper conduction path

(between the IP+ and IP– pins) exceeds this threshold, the open

drain Overcurrent Fault pin will transition to a logic low state.

Factory programming of the linear Hall sensor inside of the

ACS716 results in exceptional accuracy in both analog and

digital output signals.

The internal resistance of the copper path used for current

sensing is typically 1 mΩ, for low power loss. Also, the current

conduction path is electrically isolated from the low voltage

Continued on the next page…

VCC

1

16 Fault_EN

RH

IP+

FAULT_EN

2

15

RH, RL Sets resistor divider reference for VOC

3 IP+ ACS716 VOC 14

IP+

VCC

RL

CF Noise and bandwidth limiting filter capacitor

4

IP

IP+

5

IP–

13

RPU

FAULT

COC Fault delay setting capacitor, 22 nF maximum

12

VIOUT

COC

B

0.1 μF

A Use of capacitor required

6

IP–

11 VIOUT

FILTER

Use of resistor optional, 330 kΩ recommended.

7

IP–

8

10

VZCR

CF

9

1 nF

B If used, resistor must be connected between

¯F¯¯A¯U¯¯L¯¯T¯ pin and VCC.

IP–

GND

A

ACS716-DS, Rev. 3

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