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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

COMMON OPERATING CHARACTERISTICS (continued) Valid at TA = –40°C to 125°C, VCC = 3.3 V, unless otherwise specified

Characteristic

Symbol

Test Conditions

Min.

Typ.

Max.

OVERCURRENT CHARACTERISTICS (continued)

Units

Fault Enable (FAULT_EN Pin) Input High

Voltage Threshold

VIH

0.8 × VCC

–

–

V

Fault Enable (FAULT_EN Pin) Input

Resistance

RFEI

–

1

–

MΩ

Fault Enable (FAULT_EN Pin) Delay7

Set FAULT_EN to low, VOC = 0.25 × VCC ,

COC = 0 F; then run a DC IP exceeding the

tFED

corresponding overcurrent threshold; then

reset FAULT_EN from low to high and

–

measure the delay from the rising edge of

FAULT_EN to the falling edge of ¯F¯¯A¯U¯¯L¯¯T¯

15

–

μs

Fault Enable (FAULT_EN Pin) Delay

(Non-Latching versions)8

Set FAULT_EN to low, VOC = 0.25 × VCC ,

COC = 0 F; then run a DC IP exceeding the

tFED(NL)

corresponding overcurrent threshold; then

reset FAULT_EN from low to high and

–

measure the delay from the rising edge of

FAULT_EN to the falling edge of ¯F¯¯A¯U¯¯L¯¯T¯

150

–

ns

Overcurrent Fault Response Time

Undercurrent Fault Response Time

(Non-Latching versions)

Overcurrent Fault Reset Delay

Overcurrent Fault Reset Hold Time

FAULT_EN set to high for a minimum

of 20 μs before the overcurrent event;

switchpoint set at VOC = 0.25 × VCC ;

tOC

apply a current step to IP with amplitude

equal to 1.5 x VOC/ Sens;

–

delay from IP exceeding overcurrent

fault threshold to V ¯F¯¯A¯U¯¯L¯¯T¯ < 0.4 V, without

external COC capacitor

FAULT_EN set to high for a minimum

of 20 μs before the undercurrent event;

tUC

switchpoint set at VOC = 0.25 × VCC ; delay

from IP falling below the overcurrent fault

–

threshold to V ¯F¯¯A¯U¯¯L¯¯T¯ > 0.8 × VCC, without

external COC capacitor, RPU = 330 kΩ

tOCR

Time from VFAULTEN < VIL to

VFAULT > 0.8 × VCC , RPU = 330 kΩ

–

tOCH

Time from VFAULTEN pin < VIL to reset of

fault latch; see Functional Block Diagram

–

2

–

μs

3

–

μs

500

–

ns

250

–

ns

Overcurrent Input Pin Resistance

ROC

VOLTAGE REFERENCE CHARACTERISTICS

TA = 25°C, VOC pin to GND

2

–

–

MΩ

Voltage Reference Output

VZCR

TA = 25 °C

(Not a highly accurate reference)

0.48 x VCC 0.5 × VCC 0.52 x VCC V

Voltage Reference Output Load Current

Source current

IZCR

Sink current

3

–

–

mA

50

–

–

μA

Voltage Reference Output Drift

∆VZCR

–

±10

–

mV

1RF(INT) forms an RC circuit via the FILTER pin.

2This parameter can drift by as much as 0.8% over the lifetime of this product.

3This parameter can drift by as much as 1% over the lifetime of this product.

4See page 8 on how to set overcurrent fault switchpoint.

5Switchpoint can be lower at the expense of switchpoint accuracy.

6This error specification does not include the effect of noise. See the INCOMP specification in order to factor in the additional influence of noise on the

fault switchpoint.

7Fault Enable Delay is designed to avoid false tripping of an Overcurrent (OC) fault at power-up. A 15 μs (typical) delay will always be needed, every

time FAULT_EN is raised from low to high, before the device is ready for responding to any overcurrent event.

8During power-up, this delay is 15 μs in order to avoid false tripping of an Overcurrent (OC) fault.

Allegro MicroSystems, LLC

7

115 Northeast Cutoff

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

1.508.853.5000; www.allegromicro.com

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