Data Sheet
High Bandwidth, Fast Fault Response Current Sensor IC
In Thermally Enhanced Package
ACS709
3
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
IP–
VZCR
FILTERGND
VIOUT
Drain
IP+
FAULT
Signal
Recovery
V
OUT(Q)
Trim
Sensitivity
Trim
R
Q
CLK
D
VOC
VCC
POR
FAULT Reset
3 mA
2V
REF
POR
Hall
Bias
Control
Logic
FAULT_EN
+
–
+
–
Fault
Comparator
Hall
Amplifier
R
F(INT)
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
pin scales with V
CC
.
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