ACS712 View Datasheet(PDF) - Allegro MicroSystems
Part Name
Description
MFG CO.
'ACS712' PDF : 14 Pages View PDF
ACS712
Fully Integrated, Hall Effect-Based Linear Current Sensor IC
with 2.1 kVRMS Isolation and a Low-Resistance Current Conductor
Typical Applications
+5 V
CBYP
0.1 μF
1 IP+
8
VCC
2 IP+
7
VIOUT
COUT
0.1 μF
VOUT
RF
IP
3
4
ACS712
IP– FILTER
IP–
6
5
10 kΩ
R1
1 MΩ
CF
1 nF
GND
R2
33 kΩ
C2
0.1 μF
R4
10 kΩ
+
–
U1
D1
LT1178 1N914
R3
330 kΩ
C1
0.1 μF
VPEAK
VRESET
Q1
2N7002
Application 2. Peak Detecting Circuit
+5 V
CBYP
0.1 μF
1 IP+
8
VCC
2 IP+
7
VIOUT
VOUT
D1
1N4448W
RF
IP
ACS712
2 kΩ R1
3 IP– FILTER 6
4 IP–
5
10 kΩ
CF
1 nF
C1
GND
A-to-D
Converter
Application 4. Rectified Output. 3.3 V scaling and rectification application
for A-to-D converters. Replaces current transformer solutions with simpler
ACS circuit. C1 is a function of the load resistance and filtering desired.
R1 can be omitted if the full range is desired.
+5 V
CBYP
0.1 μF
R1
100 kΩ
R2
100 kΩ
1 IP+
8
VCC
2 IP+
7
VIOUT
IP
ACS712
RF
1 kΩ
3 IP– FILTER 6
4 IP– GND 5
CF
0.01 μF
1+
LM321
5
4
3–
2
R3
3.3 kΩ
VOUT
C1
1000 pF
Application 3. This configuration increases gain to 610 mV/A
(tested using the ACS712ELC-05A).
+5 V
CBYP
0.1 μF
R1
33 kΩ
1 IP+
8
VCC
2 IP+
7
VIOUT
IP
ACS712
3 IP– FILTER 6
4 IP– GND 5
R2
100 kΩ
VOUT
CF
1 nF
RPU
100 kΩ
4
–
5
1
Fault
3 + 2 U1
LMV7235
D1
1N914
Application 5. 10 A Overcurrent Fault Latch. Fault threshold set by R1 and
R2. This circuit latches an overcurrent fault and holds it until the 5 V rail is
powered down.
Allegro MicroSystems, Inc.
12
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
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