ACS37612LLUATR-015U5 [ALLEGRO]
Coreless, High Precision, Hall-Effect Current Sensor IC with Common-Mode Field Rejection and High Bandwidth (240 kHz);
| 型号： | ACS37612LLUATR-015U5 |
| 厂家： | 
ALLEGRO MICROSYSTEMS |
| 描述： | Coreless, High Precision, Hall-Effect Current Sensor IC with Common-Mode Field Rejection and High Bandwidth (240 kHz) |
| 文件： | 总22页 (文件大小：2238K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
ACS37612
Coreless, High Precision, Hall-Effect Current Sensor IC
with Common-Mode Field Rejection and High Bandwidth (240 kHz)
FEATURES AND BENEFITS
DESCRIPTION
• Eliminates need for concentrator core or shield
• Suited for applications where current flows through
busbar or PCB
• Very wide sensing range (2.5 to 20 mV/G)
□ Ideal for sensing currents from <200 A to >1000 A
• Factory-programmed segmented linear temperature
compensation (TC) provides low thermal drift
□ Sensitivity ±1% (typ)
□ Offset ±3 mV (typ)
• Differential Hall sensing rejects common-mode
magnetic fields
• High operating bandwidth: DC to 240 kHz
• AEC-Q100 Grade 0, automotive qualified
• Contactless, lossless, non-invasive current sensing
• Very fast response time (<2 μs typ)
• 3.3 or 5.0 V single supply operation
• Ratiometric output with unidirectional and
bidirectional modes
The Allegro ACS37612 current sensor IC enables low-cost
solutions for AC and DC current sensing without the need for
an external field concentrator core or shield. It is designed for
applications where hundreds of amps flow through a busbar
or PCB.
Applied current through a busbar or PCB traces generates a
magnetic field that is sensed by the monolithic, low-offset,
linear Hall IC. The differential sensing topology virtually
eliminates all types of errors due to common-mode stray
magnetic fields. High isolation is achieved via the no-contact
nature of this simple assembly.
TheACS37612 is offered in 140 kHz and 240 kHz bandwidth
options, making it ideal for inverter phase current sensing,
load detection and management, power supplies, and DC/
DC converters where fast switching is required. The high
response time enables overcurrent fault detection in safety-
critical applications. A –40°C to 150°C ambient operating
temperature range and a stellar ESD rating make it ready for
harsh automotive environments.
• Immune to mechanical stress
• Monolithic Hall IC for high reliability
• Wide ambient temperature range: –40°C to 150°C
• Surface mount, small footprint, low-profile
TSSOP8 package
TheACS37612 is suitable for space-constrained applications
becauseofitslow-profile8-pinsurfacemountTSSOPpackage
(thin-shrink small outline package, suffix LU) that is lead
(Pb) free, with 100% matte tin leadframe plating.
PACKAGE:
TYPICAL APPLICATIONS
• High voltage traction motor inverter
• 48 V / 12 V auxiliary inverter
• Battery monitoring
8-pin TSSOP package (suffix LU)
• Overcurrent detection
• DC/DC converter
Not to scale
• Smart fuse
• Power distribution unit (PDU)
• Power supply
Figure 1: Current Through PCB
Figure 2: Current Through Busbar
ACS37612-DS
MCO-0000792
March 9, 2020
Coreless, High Precision, Hall-Effect Current Sensor IC
with Common-Mode Field Rejection and High Bandwidth (240 kHz)
ACS37612
SELECTION GUIDE
Differential
Magnetic
Input Range, (G)
Sensitivity
Sens (Typ.)
(mV/G)[1]
Nominal Supply
Voltage (V)
Bandwidth
(kHz)
TA
(°C)
Part Number
Packing[2]
ACS37612LLUATR-005B5
ACS37612LLUATR-010B3
ACS37612LLUATR-010B5
ACS37612LLUATR-015B5
ACS37612LLUATR-015U5
±400
±135
5
5
3.3
5
10
10
15
15
±200
140
–40 to 150
4000 pieces per 13-inch reel
±130
5
0 to 265
5
[1] Measured at nominal supply voltage. Contact Allegro for other sensitivity options.
[2] Contact Allegro for additional packing options.
AꢀS 3ꢁꢂ1ꢃ
ꢄ
ꢄUA ꢑR
-
010
ꢅ
3
ꢀlamꢇsꢉ
ꢖblankꢗ ꢊ ꢍeꢘaꢆlt, ꢀlamꢇs disaꢕled
ꢀ ꢊ ꢀlamꢇs enaꢕled
ꢅandwidthꢉ
ꢖblankꢗ ꢊ ꢍeꢘaꢆlt, ꢅꢙ ꢋ 1ꢚ0 ꢔHꢛ
H ꢊ High, ꢅꢙ ꢋ ꢃꢚ0 ꢔHꢛ
Sꢆꢇꢇly ꢈoltageꢉ
5 ꢊ ꢈꢀꢀ ꢋ 5 ꢈ
3 ꢊ ꢈꢀꢀ ꢋ 3.3 ꢈ
ꢌꢆtꢇꢆt ꢍirectionalityꢉ
ꢅ ꢊ ꢅidirectional ꢎꢇositiꢏe and negatiꢏe cꢆrrentꢐ
U ꢊ Unidirectional ꢎonly ꢇositiꢏe cꢆrrentꢐ
ꢑyꢇical Sensitiꢏity ꢎmꢈꢒꢓꢐ
Pacꢔing ꢍesignator
Pacꢔage ꢍesignator
ꢌꢇerating ꢑemꢇeratꢆre Range
5-ꢍigit Part Nꢆmꢕer
Allegro ꢀꢆrrent Sensor
2
Allegro MicroSystems
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
Coreless, High Precision, Hall-Effect Current Sensor IC
with Common-Mode Field Rejection and High Bandwidth (240 kHz)
ACS37612
ABSOLUTE MAXIMUM RATINGS
Characteristic
Symbol
Notes
Rating
6.5
Unit
V
Supply Voltage
VCC
VRCC
Reverse Supply Voltage
Output Voltage
–0.5
6.5
V
VIOUT
V
Reverse Output Voltage
Output Source Current
Output Sink Current
VRIOUT
IOUT(Source)
IOUT(Sink)
–0.5
3
V
VOUT to GND
mA
mA
Minimum pull-up resistor of 500 Ω
10
Nominal Operating Ambient
Temperature
TA
Range L
–40 to 150
°C
Maximum Junction Temperature
Storage Temperature
TJ(max)
Tstg
165
°C
°C
–65 to 165
ESD RATINGS
Characteristic
Symbol
VHBM
Test Conditions
Value
±12
±1
Unit
Human Body Model
Charged Device Model
Per AEC-Q100
Per AEC-Q100
kV
kV
VCDM
THERMAL CHARACTERISTICS: May require derating at maximum conditions; see application information
Characteristic
Symbol
Test Conditions*
Value
Unit
Package Thermal Resistance
RθJA
LU package, on 4-layer PCB based on JEDEC standard
145
°C/W
*Additional thermal information available on the Allegro website
ꢂꢃꢃ
ꢂꢃꢃ
ꢀUꢁ
ꢀUꢁ
ꢃꢇꢈPASS
0.1 ꢉꢊ
ꢃꢆ
ACS37612
ꢄNꢅ
Figure 3: Typical Application Circuit
The ACS37612 outputs an analog signal, VOUT, that varies linearly with the bi-
directional AC or DC field sensed within the range specified. CL is for optimal
noise management, with values that depend on the application.
3
Allegro MicroSystems
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
Coreless, High Precision, Hall-Effect Current Sensor IC
with Common-Mode Field Rejection and High Bandwidth (240 kHz)
ACS37612
Pinout List
ꢀꢁUꢂ
ꢃNꢄ
Nꢅ
ꢈ
ꢉ
ꢊ
5
Nꢅ
1
ꢆ
3
ꢇ
Number
Name
VOUT
GND
NC
Description
Nꢅ
Nꢅ
Nꢅ
1
Analog output signal, also used for programming
Ground pin
2
ꢀꢅꢅ
3, 5, 6, 7, 8
4
Not connect; tie to GND for optimal ESD performance
Input power supply, also used for programming
VCC
Figure 4: Pinout Diagram
ꢈꢃꢃ
ACS37612
ꢄo all sꢅꢆcircꢅits
ꢃꢐꢑPASS
Underꢊoltage
ꢀetection ꢋ1ꢌ
Programming ꢃontrol
Hall ꢃꢅrrent
ꢀriꢊe
ꢄemꢍeratꢅre Sensor
ꢎꢎPRꢁM and ꢃontrol ꢏogic
ꢁꢂꢂset
ꢃontrol
ꢁꢅtꢍꢅt
ꢃlamꢍs
Actiꢊe ꢄemꢍeratꢅre
ꢃomꢍensation
Sensitiꢊity ꢃontrol
ꢈꢉꢁUꢄ
Signal Recoꢊery
ꢃꢏ
ꢇNꢀ
ꢋ1ꢌ Underꢊoltage ꢀetection in disaꢆled when the sꢅꢍꢍly ꢊoltage is conꢂigꢅred to 3.3 ꢈ.
Figure 5: Functional Block Diagram
4
Allegro MicroSystems
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
Coreless, High Precision, Hall-Effect Current Sensor IC
with Common-Mode Field Rejection and High Bandwidth (240 kHz)
ACS37612
COMMON OPERATING CHARACTERISTICS: Valid at TOP = –40°C to 150°C and VCC = 5 V, unless otherwise specified
Characteristic
Symbol
Test Conditions
Min.
Typ.
Max.
Unit
ELECTRICAL CHARACTERISTICS
Hall Spacing
HDIST
Distance between Halls
–
4.5
3
1.87
5
–
mm
V
5 V nominal supply voltage variant
3.3 V nominal supply voltage variant
5.5
3.6
Supply Voltage
VCC
3.3
V
VCC(min) ≤ VCC ≤ VCC(max), where VCC = 5 V or 3.3 V,
no load on output
Supply Current
Power-On Delay
ICC
tPO
tTC
–
–
–
12
70
45
16
–
mA
µs
TA = 25°C
Temperature Compensation
Power-On Time
TA = 25°C, CL (of test probe) = 10 pF, CBYPASS = open
–
µs
VCC rising; UVLO is disabled, enabling the device
output
VUVLOD
VUVLOE
–
3.8
4.2
V
Undervoltage Lockout (UVLO)
Threshold[1]
VCC falling; UVLO is enabled, disabling the device
output
3.45
–
3.7
100
74
–
–
–
V
UVLO Hysteresis
VUVLO(HYS) TA = 25°C
Time measured from falling VCC < VUVLOE to
mV
µs
tUVLOE
–
UVLO enabled
UVLO Enable/Disable
Delay Time
Time measured from rising VCC > VUVLOD to
UVLO disabled
tUVLOD
–
7
–
µs
Power-On Release Delay
Power-On Reset Voltage
tPORD
VPORH
VPORL
3.3 V part variant only
VCC rising
–
–
–
–
–
7
–
–
–
–
–
µs
V
2.8
2.5
64
VCC falling
V
Power-On Reset Release Time
Power-On Reset Hysteresis
tPORR
TA = 25°C, VCC rising
µs
mV
VHys(POR)
250
CL = 1 nF, device programmed to lowest bandwidth
mode (default)
–
–
140
240
–
–
kHz
kHz
Internal Bandwidth
BWi
CL = 1 nF, device programmed to highest bandwidth
mode
BWi = 240 kHz
BWi = 140 kHz
BWi = 240 kHz
BWi = 140 kHz
BWi = 240 kHz
BWi = 140 kHz
–
1.7
3.2
1
–
µs
µs
µs
µs
µs
µs
Ω
TA = 25°C, CL = 1 nF, 1 V step on
output, from 10% to 90% output
Rise Time [2]
tr
–
–
–
–
TA = 25°C, CL = 1 nF, 1 V step on
output
Propagation Delay Time [2]
Response Time [2]
tPD
–
1.5
1.6
3.2
< 1
–
–
–
–
TA = 25°C, CL = 1 nF, 1 V step on
output, 90% input to 90% output
tRESPONSE
ROUT
–
–
DC Output Impedance
Output Load Resistance
Output Load Capacitance
–
–
RLOAD(MIN) VOUT to GND
CLOAD(MAX) VOUT to GND
4.7
–
kΩ
nF
V
–
0.9 × VCC
–
1
10
–
VCLP(HIGH)
VCLP(LOW)
TA = 25°C, RL(PULLDWN) = 10 kΩ to GND
TA = 25°C, RL(PULLUP) = 10 kΩ to VCC
–
Output Voltage Clamp
(Clamp Enable Option Only)
–
0.1 × VCC
V
Delay to Clamp
(Clamp Enable Option Only)
TA = 25°C; CL = 1nF; Step from 75% output range to
150%
tCLP
–
5
–
µs
Output Saturation Voltage
(Clamp Disabled Option
(Default) Only)
VSAT(HIGH)
VSAT(LOW)
TA = 25°C, RL(PULLDWN) = 10 kΩ to GND
TA = 25°C, RL(PULLUP) = 10 kΩ to VCC
VCC – 0.2
–
–
–
–
V
200
mV
Continued on the next page…
5
Allegro MicroSystems
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
Coreless, High Precision, Hall-Effect Current Sensor IC
with Common-Mode Field Rejection and High Bandwidth (240 kHz)
ACS37612
COMMON OPERATING CHARACTERISTICS (continued): Valid at TOP = –40°C to 150°C and VCC = 5 V, unless otherwise specified
Characteristic
Symbol
Test Conditions
Min.
Typ.
Max.
Unit
QUIESCENT OUTPUT VOLTAGE (VOUT(Q)
)
Bidirectional variant, no magnetic field,
TA = 25°C; VOUT(QBI) ratiometric to VCC
VOUT(QBI)
–
–
VCC / 2
–
–
V
V
Quiescent Output Voltage
Unidirectional variant, no magnetic field,
TA = 25°C; VOUT(QUNI) ratiometric to VCC
VOUT(QUNI)
0.1 × VCC
ERROR COMPONENTS
Clamp Ratiometry Error
RatERRCLP VCC = ±5% variation of nominal supply voltage
–
–
±1.0
2
–
–
1
–
%
mGRMS
/√(Hz)
Noise
BN
TA = 25°C, CL = 1 nF
Up to full-scale output
Measured at 100 G
Nonlinearity
ELIN
–1
–
±0.45
40
%
Common Mode Field
Rejection Ratio
CMFR
dB
[1] UVLO feature is only available on part numbers programmed with a 5 V nominal supply voltage.
[2] Timing specified does not include potential effect of skin effect on conductor; value will depend on busbar/PCB design.
-005B5 PERFORMANCE CHARACTERISTICS: TA = –40°C to 150°C, VCC= 5 V, unless otherwise specified
Characteristic
NOMINAL PERFORMANCE
Differential Magnetic Range
Sensitivity
Symbol
Test Conditions
Min.
Typ. [1]
Max.
Unit
BDIFF
Sens
–400
–
–
5
400
–
G
VCC(min) ≤ VCC ≤ VCC(max)
mV/G
ACCURACY PERFORMANCE
TA = 25°C, CL = 1 nF, BW = 140 kHz
TA = 25°C, CL = 1 nF, BW = 240 kHz
TA = 25°C
–
4.5
6.5
±1
–
–
2
2
2
mVRMS
mVRMS
%
Noise
VN
–
Sensitivity Error
SensERR
ΔSensTC
–2
–2
–2
TA = 25°C to 150°C
±1
%
Sensitivity Drift Over Temperature
TA = –40°C to 25°C
±1
%
QUIESCENT VOLTAGE OUTPUT ERROR
Factory Quiescent Voltage Output Error
VQVOERR
TA = 25°C
–5
–5
±3
±3
5
5
mV
mV
mV
mV
%
TA = 25°C to 150°C
TA = –40°C to 25°C
Quiescent Voltage Output
Temperature Error
VOUT(Q)TC
–5
±3
5
QVO Ratiometry Error
Sens Ratiometry Error
VRatERRQVO VCC = ±5% variation of nominal supply voltage
RatERRSens VCC = ±5% variation of nominal supply voltage
–7.5
–1.25
±2.5
±0.5
7.5
1.25
LIFETIME DRIFT CHARACTERISTICS [2]
QVO Lifetime Drift
VQVOLife
TA = 25°C
–
–
–
–
1.4
0.6
1.5
0.6
–
–
–
–
mV
%
Sens Lifetime Drift
QVO TC Lifetime Drift
Sens TC Lifetime Drift
SensERRLife TA = 25°C
VQVOTCLife TA = 25°C to 150°C
SensTCLife TA = 25°C to 150°C
mV
%
[1] All typical values are ±3 sigma.
[2] Typical lifetime value corresponds to worse case average drift found during AEC-Q100 qualification.
6
Allegro MicroSystems
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
Coreless, High Precision, Hall-Effect Current Sensor IC
with Common-Mode Field Rejection and High Bandwidth (240 kHz)
ACS37612
-010B3 PERFORMANCE CHARACTERISTICS: TA = –40°C to 150°C, VCC= 3.3 V, unless otherwise specified
Characteristic
NOMINAL PERFORMANCE
Differential Magnetic Range
Sensitivity
Symbol
Test Conditions
Min.
Typ. [1]
Max.
Unit
BDIFF
Sens
–135
–
–
135
–
G
VCC(min) ≤ VCC ≤ VCC(max)
10
mV/G
ACCURACY PERFORMANCE
TA = 25°C, CL = 1 nF, BW = 140 kHz
TA = 25°C, CL = 1 nF, BW = 240 kHz
TA = 25°C
–
9
12.5
±1
–
–
2
2
2
mVRMS
mVRMS
%
Noise
VN
–
Sensitivity Error
SensERR
ΔSensTC
–2
–2
–2
TA = 25°C to 150°C
±1
%
Sensitivity Drift Over Temperature
TA = –40°C to 25°C
±1
%
QUIESCENT VOLTAGE OUTPUT ERROR
Factory Quiescent Voltage Output Error
VQVOERR
TA = 25°C
–5
–5
±3
±3
5
5
mV
mV
mV
mV
%
TA = 25°C to 150°C
TA = –40°C to 25°C
Quiescent Voltage Output
Temperature Error
VOUT(Q)TC
–5
±3
5
QVO Ratiometry Error
Sens Ratiometry Error
VRatERRQVO VCC = ±3% variation of nominal supply voltage
RatERRSens VCC = ±3% variation of nominal supply voltage
–15
–1.25
±5
15
1.25
±0.5
LIFETIME DRIFT CHARACTERISTICS [2]
QVO Lifetime Drift
VQVOLife
TA = 25°C
–
–
–
–
1.4
0.6
1.5
0.6
–
–
–
–
mV
%
Sens Lifetime Drift
QVO TC Lifetime Drift
Sens TC Lifetime Drift
SensERRLife TA = 25°C
VQVOTCLife TA = 25°C to 150°C
SensTCLife TA = 25°C to 150°C
mV
%
[1] All typical values are ±3 sigma.
[2] Typical lifetime value corresponds to worse case average drift found during AEC-Q100 qualification.
7
Allegro MicroSystems
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
Coreless, High Precision, Hall-Effect Current Sensor IC
with Common-Mode Field Rejection and High Bandwidth (240 kHz)
ACS37612
-010B5 PERFORMANCE CHARACTERISTICS: TA = –40°C to 150°C, VCC= 5 V, unless otherwise specified
Characteristic
NOMINAL PERFORMANCE
Differential Magnetic Range
Sensitivity
Symbol
Test Conditions
Min.
Typ. [1]
Max.
Unit
BDIFF
Sens
–200
–
–
200
–
G
VCC(min) ≤ VCC ≤ VCC(max)
10
mV/G
ACCURACY PERFORMANCE
TA = 25°C, CL = 1 nF, BW = 140 kHz
TA = 25°C, CL = 1 nF, BW = 240 kHz
TA = 25°C
–
9
12.5
±1
–
–
2
2
2
mVRMS
mVRMS
%
Noise
VN
–
Sensitivity Error
SensERR
ΔSensTC
–2
–2
–2
TA = 25°C to 150°C
±1
%
Sensitivity Drift Over Temperature
TA = –40°C to 25°C
±1
%
QUIESCENT VOLTAGE OUTPUT ERROR
Factory Quiescent Voltage Output Error
VQVOERR
TA = 25°C
–5
–5
±3
±3
5
5
mV
mV
mV
mV
%
TA = 25°C to 150°C
TA = –40°C to 25°C
Quiescent Voltage Output
Temperature Error
VOUT(Q)TC
–5
±3
5
QVO Ratiometry Error
Sens Ratiometry Error
VRatERRQVO VCC = ±5% variation of nominal supply voltage
RatERRSens VCC = ±5% variation of nominal supply voltage
–7.5
–1.25
±2.5
±0.5
7.5
1.25
LIFETIME DRIFT CHARACTERISTICS [2]
QVO Lifetime Drift
VQVOLife
TA = 25°C
–
–
–
–
1.4
0.6
1.5
0.6
–
–
–
–
mV
%
Sens Lifetime Drift
QVO TC Lifetime Drift
Sens TC Lifetime Drift
SensERRLife TA = 25°C
VQVOTCLife
SensTCLife
TA = 25°C to 150°C
TA = 25°C to 150°C
mV
%
[1] All typical values are ±3 sigma.
[2] Typical lifetime value corresponds to worse case average drift found during AEC-Q100 qualification.
8
Allegro MicroSystems
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
Coreless, High Precision, Hall-Effect Current Sensor IC
with Common-Mode Field Rejection and High Bandwidth (240 kHz)
ACS37612
-015B5 PERFORMANCE CHARACTERISTICS: TA = –40°C to 150°C, VCC= 5 V, unless otherwise specified
Characteristic
NOMINAL PERFORMANCE
Differential Magnetic Range
Sensitivity
Symbol
Test Conditions
Min.
Typ. [1]
Max.
Unit
BDIFF
Sens
–130
–
–
130
–
G
VCC(min) ≤ VCC ≤ VCC(max)
15
mV/G
ACCURACY PERFORMANCE
TA = 25°C, CL = 1 nF, BW = 140 kHz
TA = 25°C, CL = 1 nF, BW = 240 kHz
TA = 25°C
–
13
19
±1
±1
±1
–
–
2
2
2
mVRMS
mVRMS
%
Noise
VN
–
Sensitivity Error
SensERR
ΔSensTC
–2
–2
–2
TA = 25°C to 150°C
%
Sensitivity Drift Over Temperature
TA = –40°C to 25°C
%
QUIESCENT VOLTAGE OUTPUT ERROR
Factory Quiescent Voltage Output Error
VQVOERR
TA = 25°C
–10
–10
±6
±6
10
10
mV
mV
mV
mV
%
TA = 25°C to 150°C
TA = –40°C to 25°C
Quiescent Voltage Output
Temperature Error
VOUT(Q)TC
–10
±6
10
QVO Ratiometry Error
Sens Ratiometry Error
VRatERRQVO VCC = ±5% variation of nominal supply voltage
RatERRSens VCC = ±5% variation of nominal supply voltage
–7.5
–1.25
±2.5
±0.5
7.5
1.25
LIFETIME DRIFT CHARACTERISTICS [2]
QVO Lifetime Drift
VQVOLife
TA = 25°C
–
–
–
–
1.4
0.6
1.5
0.6
–
–
–
–
mV
%
Sens Lifetime Drift
QVO TC Lifetime Drift
Sens TC Lifetime Drift
SensERRLife TA = 25°C
VQVOTCLife TA = 25°C to 150°C
SensTCLife TA = 25°C to 150°C
mV
%
[1] All typical values are ±3 sigma.
[2] Typical lifetime value corresponds to worse case average drift found during AEC-Q100 qualification.
9
Allegro MicroSystems
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
Coreless, High Precision, Hall-Effect Current Sensor IC
with Common-Mode Field Rejection and High Bandwidth (240 kHz)
ACS37612
-015U5 PERFORMANCE CHARACTERISTICS: TA = –40°C to 150°C, VCC= 5 V, unless otherwise specified
Characteristic
NOMINAL PERFORMANCE
Differential Magnetic Range
Sensitivity
Symbol
Test Conditions
Min.
Typ. [1]
Max.
Unit
BDIFF
Sens
0
–
–
265
–
G
VCC(min) ≤ VCC ≤ VCC(max)
15
mV/G
ACCURACY PERFORMANCE
TA = 25°C, CL = 1 nF, BW = 140 kHz
TA = 25°C, CL = 1 nF, BW = 240 kHz
TA = 25°C
–
13
19
±1
±1
±1
–
–
2
2
2
mVRMS
mVRMS
%
Noise
VN
–
Sensitivity Error
SensERR
ΔSensTC
–2
–2
–2
TA = 25°C to 150°C
%
Sensitivity Drift Over Temperature
TA = –40°C to 25°C
%
QUIESCENT VOLTAGE OUTPUT ERROR
Factory Quiescent Voltage Output Error
VQVOERR
TA = 25°C
–10
–10
±6
±6
10
10
mV
mV
mV
mV
%
TA = 25°C to 150°C
TA = –40°C to 25°C
Quiescent Voltage Output
Temperature Error
VOUT(Q)TC
–10
±6
10
QVO Ratiometry Error
Sens Ratiometry Error
VRatERRQVO VCC = ±5% variation of nominal supply voltage
RatERRSens VCC = ±5% variation of nominal supply voltage
–7.5
–1.25
±2.5
±0.5
7.5
1.25
LIFETIME DRIFT CHARACTERISTICS [2]
QVO Lifetime Drift
VQVOLife
TA = 25°C
–
–
–
–
1.4
0.6
1.5
0.6
–
–
–
–
mV
%
Sens Lifetime Drift
QVO TC Lifetime Drift
Sens TC Lifetime Drift
SensERRLife TA = 25°C
VQVOTCLife TA = 25°C to 150°C
SensTCLife TA = 25°C to 150°C
mV
%
[1] All typical values are ±3 sigma.
[2] Typical lifetime value corresponds to worse case average drift found during AEC-Q100 qualification.
10
Allegro MicroSystems
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
Coreless, High Precision, Hall-Effect Current Sensor IC
with Common-Mode Field Rejection and High Bandwidth (240 kHz)
ACS37612
FUNCTIONAL DESCRIPTION
Principle of Operation
When AC or DC current flows through a PCB copper trace or a
busbar, as shown in Figure 6, the ACS37612 device will sense
the field difference between its two Hall elements H1 and H2,
represented by field components B- and B+. The device output
will be proportional to the differential field sensed, which is
proportional to the applied current. The relationship between
applied current and generated field is described as:
Bdiff = CF × I,
where Bdiff is the differential field (H1-H2), CF is the differential
coupling factor, and I is the current through the busbar/PCB trace.
Figure 6: Current Sensing Principle
Device Output Polarity
Current flowing through the PCB/busbar in the direction of pin
1 to pin 4, as shown in Figure 7, increases the output voltage
from its quiescent value toward the supply voltage rail (from
2.5 V to 4.5 V typical on bidirectional version, and 0.5 V to
4.5 V typical on unidirectional version).
The amount of the output voltage increase is proportional to the
magnitude of the applied current. Conversely, current flowing
in the opposite direction decreases the output voltage from its
quiescent value.
Figure 7: Polarity
11
Allegro MicroSystems
955 Perimeter Road
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www.allegromicro.com
Coreless, High Precision, Hall-Effect Current Sensor IC
with Common-Mode Field Rejection and High Bandwidth (240 kHz)
ACS37612
CHARACTERISTIC PERFORMANCE
Figure 8: Response time, rise time, and propagation delay on 3.5 mm Reference PCB.
Sensitivity = 15 mV/G, TA = 25°C, CBYPASS = 100 nF, CLOAD = 1 nF, BW = 140 kHz
Figure 9: Response time, rise time, and propagation delay on Reference Busbar.
Sensitivity = 15 mV/G, TA = 25°C, CBYPASS = 100 nF, CLOAD = 1 nF, BW = 140 kHz
12
Allegro MicroSystems
955 Perimeter Road
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Coreless, High Precision, Hall-Effect Current Sensor IC
with Common-Mode Field Rejection and High Bandwidth (240 kHz)
ACS37612
VCC is still below VUVLOE when counter reaches tUVLOE , the
Power-On Reset (POR) and
Undervoltage Lockout (UVLO) Operation –
Nominal Supply Voltage = 5 V
UVLO function will be enabled and the output will be pulled
near GND [6]. If VCC exceeds VUVLOE before the UVLO
Enable Counter reaches tUVLOE [5’], the output will continue
to be VCC/2.
The descriptions in this section assume: temperature = 25°C, no
output load (RL, CL), and no significant magnetic field is present.
•
•
Coming out of UVLO. While UVLO is enabled [6], if VCC
exceeds VUVLOD [7], UVLO will be disabled after tUVLOD
and the output will be VCC / 2 [8].
,
•
Power-Up. At power-up, as VCC ramps up, the output is in
a high-impedance state. When VCC crosses VPORH (location
[1] in Figure 10 and [1’] in Figure 11), the POR Release
counter starts counting for tPORR. At this point, if VCC exceeds
VUVLOD [2’], the output will go to VCC / 2 after tUVLOD [3’].
If VCC does not exceed VUVLOD [2], the output will stay in the
high-impedance state until VCC reaches VUVLOD [3] and then
will go to VCC / 2 after tUVLOD [4].
Power-Down. As VCC ramps down below VUVLOE [6’, 9], the
UVLO Enable Counter will start counting. If VCC is higher
than VPORL when the counter reaches tUVLOE, the UVLO
function will be enabled and the output will be pulled near
GND [10]. The output will enter a high-impedance state as
V
CC goes below VPORL [11]. If VCC falls below VPORL before
•
VCC drops below VCC(min) = 4.5 V. If VCC drops below
VUVLOE [4’, 5], the UVLO Enable Counter starts counting. If
the UVLO Enable Counter reaches tUVLOE , the output will
transition directly into a high-impedance state [7’].
ꢀ
ꢎꢎ
11
10
9
1
ꢇ
3
ꢉ
5
ꢊ
ꢈ
ꢒ
5.0
ꢀUꢀꢁꢂꢄ
ꢀUꢀꢁꢂꢃ
ꢀPꢂRH
ꢀPꢂRꢁ
tUꢀꢁꢂꢃ
tUꢀꢁꢂꢃ
ꢐNꢄ
ꢑime
ꢑime
ꢀ
Sloꢌe ꢍ
ꢀꢎꢎ ꢏꢇ
ꢂUꢑ
ꢇ.5
tPꢂRR
tUꢀꢁꢂꢄ
tUꢀꢁꢂꢄ
ꢐNꢄ
High ꢋmꢌedance
High ꢋmꢌedance
Figure 10: POR and UVLO Operation – Slow Rise Time Case – 5 V Mode
ꢀ
ꢎꢎ
1ꢆ ꢇꢆ
3ꢆ
ꢈꢆ 5ꢆ
ꢊꢆ
ꢉꢆ
5.0
ꢀUꢀꢁꢂꢄ
ꢀUꢀꢁꢂꢃ
ꢀPꢂRH
ꢀPꢂRꢁ
ꢅ tUꢀꢁꢂꢃ
ꢐNꢄ
ꢑime
ꢑime
tPꢂRR
ꢀ
ꢂUꢑ
Sloꢌe ꢍ
ꢎꢎ ꢏꢇ
ꢅtUꢀꢁꢂꢃ
Sloꢌe ꢍ
ꢀꢎꢎ ꢏꢇ
ꢀ
ꢇ.5
tUꢀꢁꢂꢄ
ꢐNꢄ
High ꢋmꢌedance
High ꢋmꢌedance
Figure 11: POR and UVLO Operation – Fast Rise Time Case – 5 V Mode
13
Allegro MicroSystems
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Coreless, High Precision, Hall-Effect Current Sensor IC
with Common-Mode Field Rejection and High Bandwidth (240 kHz)
ACS37612
Power-On Reset (POR);
Undervoltage Lockout (UVLO) Disabled –
Nominal Supply Voltage = 3.3 V
VCC drops below VCC(min) = 3 V
Power-Up
If VCC drops below VPORH [5’] but remains higher than VPORL
[6’], the output will continue to be VCC /2.
At power-up, as VCC ramps up, the output is in a high-impedance
state. When VCC crosses VPORH (location [1] in Figure 12 and
[1’] in Figure 13), the POR Release counter starts counting for
tPORR [2], [2’] and the output will go to VCC / 2 after tPORD [3],
[3’]. The temperature compensation engine will then adjust the
device Sensitivity and QVO after time tTC [4], [4’].
Power-Down
As VCC ramps down below VPORL [5],[7’], the output will enter a
high-impedance state.
3
ꢉꢃꢃ
3.3
1
ꢈ
ꢅ
5
ꢉPꢀRH
ꢉPꢀRꢊ
ꢏNꢁ
ꢂime
tꢂꢃ
ꢉꢀUꢂ
tPꢀRꢁ
tPꢀRR
1.ꢆ5
Sloꢌe ꢍ
ꢉꢃꢃ ꢎꢈ
ꢏNꢁ
ꢂime
High ꢋmꢌedance
High ꢋmꢌedance
Figure 12: POR and UVLO Operation – Slow Rise Time Case – 3.3 V Mode
1ꢄ
3ꢄ
ꢈꢄ
ꢉꢃꢃ
3.3
ꢆꢄ
ꢇꢄ
5ꢄ
ꢅꢄ
ꢉPꢀRH
ꢉPꢀRꢊ
ꢏNꢁ
ꢂime
ꢂime
tꢂꢃ
ꢉꢀUꢂ
tPꢀRꢁ
Sloꢌe ꢍ
ꢉꢃꢃ ꢎꢈ
Sloꢌe ꢍ
ꢉꢃꢃ ꢎꢈ
1.ꢆ5
High ꢋmꢌedance
tPꢀRR
ꢏNꢁ
High ꢋmꢌedance
Figure 13: POR and UVLO Operation – Fast Rise Time Case – 3.3 V Mode
14
Allegro MicroSystems
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
Coreless, High Precision, Hall-Effect Current Sensor IC
with Common-Mode Field Rejection and High Bandwidth (240 kHz)
ACS37612
CHARACTERISTIC DEFINITIONS
Definitions of Accuracy Characteristics
SENSITIVITY (Sens)
RATIOMETRY
The amount of the output voltage increase is proportional to the
magnitude of the magnetic field applied. This proportionality is
specified as the magnetic sensitivity, Sens (mv/G), of the device,
and it is defined as:
The device features a ratiometric output. This means that the
quiescent voltage output, VOUT(Q), and the magnetic sensitivity,
Sens, are proportional to the supply voltage, VCC. The ratiometric
change in the quiescent voltage output is defined as:
┌
│
│
└
┐
│
ꢁ
– ꢁ
OUT(B2)
OUT(B1)
ꢀCC
ꢀens
=
ꢀRatERRQVO
=
ꢀOUTQ(5V)
×
ꢁ ꢀOUTQ(VCC) × 1000 (mV)
│
┘
B1 ꢂ B2
5 V
where B1 and B2 are two different magnetic field levels.
and the ratiometric change (%) in sensitivity is defined as:
SENSITIVITY DRIFT THROUGH TEMPERATURE
┌
│
│
│
│
│
└
┐
│
│
│
│
│
┘
RANGE (ΔSENSTC
)
Sens(VCC)
Sens(5V)
VCC
(
)
Second-order sensitivity temperature coefficient effects cause the
magnetic sensitivity, Sens, to drift from its expected value over
the operating ambient temperature range (TA). The Sensitivity
Drift Through Temperature Range (ΔSensTC) is defined as:
RatERRSens
=
1 –
× 100 (%)
(
)
5 V
ꢀens – ꢀens
TA
EꢀPECTED(TA)
Δꢀens
× 100 (%)
TC =
and the ratiometric change (%) in clamp voltage is defined as:
ꢀens
EꢀPECTED(TA)
┌
│
│
│
│
│
└
┐
│
│
│
│
│
┘
NONLINEARITY (ELIN
)
VCLP(VCC)
VCLP(5V)
VCC
(
)
The nonlinearity is a measure of how linear the output of the
sensor IC is over the full current measurement range. The
nonlinearity is calculated as:
RatERRCLP
=
1 –
× 100 (%)
5 V
SensBPRMax
SensBPRHalf
× 100 (%)
1–
ELIN
=
{
[
[ {
where SensBPRMax is the sensitivity measured at the full range
output level and SensBPRHalf is the sensitivity measured at half of
the full range output level.
15
Allegro MicroSystems
955 Perimeter Road
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Coreless, High Precision, Hall-Effect Current Sensor IC
with Common-Mode Field Rejection and High Bandwidth (240 kHz)
ACS37612
disabled when VCC reaches VPORH and time tPORR has elapsed,
allowing the output voltage to go from a high-impedance state
into normal operation. During power-down, the Reset signal is
enabled when VCC reaches VPORL, causing the output voltage to
go into a high-impedance state. (Note that a detailed description
of POR can be found in the Functional Description section).
QUIESCENT OUTPUT VOLTAGE (VOUT(Q)
)
The output of the sensor when no magnetic field is detected. For
a unipolar supply voltage, it nominally remains at 0.5 × VCC for
a bidirectional device and 0.1 × VCC for a unidirectional device.
For example, in the case of a bidirectional output device, VCC
=
5 V translates into VOUT(Q) = 2.5 V. Variation in VOUT(Q) can be
attributed to the resolution of the Allegro linear IC quiescent volt-
age trim and thermal drift.
POWER-ON RESET RELEASE TIME (tPORR
)
When VCC rises to VPORH, the Power-On Reset Counter starts.
The device output voltage will transition from a high-impedance
state to normal operation only when the Power-On Reset Counter
OFFSET ERROR VOLTAGE (VOE
)
The deviation of the device output from its ideal quiescent value
of 0.5 × VCC (bidirectional) or 0.1 × VCC (unidirectional) due to
nonmagnetic causes.
has reached tPORR and VCC has been maintained above VPORH
.
OUTPUT SATURATION VOLTAGE (VSAT
)
POWER-ON RESET VOLTAGE (VPOR
)
When output voltage clamps are disabled, the output voltage
can swing to a maximum of VSAT(HIGH) and to a minimum of
On power-up, to initialize to a known state and avoid current
spikes, the device is held in Reset state. The Reset signal is
VSAT(LOW)
.
16
Allegro MicroSystems
955 Perimeter Road
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Coreless, High Precision, Hall-Effect Current Sensor IC
with Common-Mode Field Rejection and High Bandwidth (240 kHz)
ACS37612
Definitions of Dynamic Response Characteristics
POWER-ON TIME (tPO
)
When the supply is ramped to its operating voltage, the device
requires a finite time to power its internal components before
responding to an input magnetic field. Power-On Time, tPO, is
defined as the time it takes for the output voltage to settle within
±10% of its steady-state value under an applied magnetic field,
after the power supply has reached its minimum specified operat-
ing voltage, VCC(min), as shown in Figure 14.
RISE TIME (tr)
The time interval between a) when the sensor reaches 10% of its
full-scale value, and b) when it reaches 90% of its full-scale value,
as shown in Figure 15.
PROPAGATION DELAY (tPD
)
The time interval between a) when the sensed current reaches
20% of its full-scale value, and b) when the sensor output reaches
20% of its full-scale value, as shown in Figure 15.
Figure 14: Power-On Time (tPO
)
RESPONSE TIME (tRESPONSE
)
ꢀꢁrrent on ꢂꢁsꢃarꢄPꢀꢂ
ꢉꢊꢋ
90
The time interval between a) when the sensed current reaches
90% of its final value, and b) when the sensor output reaches 90%
of its full-scale value, as shown in Figure 16.
ꢅꢆUꢇ
Delay to Clamp (tCLP
)
Rise ꢇime, tR
A large magnetic input step may cause the clamp to overshoot its
steady-state value. The Delay to Clamp, tCLP, is defined as: the
time it takes for the output voltage to settle within ±1% of Clamp
Voltage Dynamic Range, after initially passing through its steady-
state voltage, as shown in Figure 17.
ꢈ0
10
0
t
Proꢌagation ꢍelay, tPꢍ
Figure 15: Propagation Delay (tPD) and Rise Time (tr)
ꢁꢂrrent on ꢃꢂsꢄarꢅPꢁꢃ
ꢀ
ꢀꢁꢑPꢏHꢒꢓHꢐ
ꢀꢆUꢇ
tꢁꢑP
t1
tꢋ
ꢀꢁrrent on ꢂꢁsꢃarꢄPꢀꢂ
ꢅꢆUꢇ
ꢈꢉꢊ
90
t1ꢈ time at which oꢂtꢉꢂt ꢊoltage initially
reaches steady state clamꢉ ꢊoltage
tꢋꢈ time at which oꢂtꢉꢂt ꢊoltage settles to
within 1ꢌ oꢍ steady state clamꢉ ꢊoltage
Resꢋonse ꢇime, t
RꢌSPꢆNSꢌ
Noteꢎ ꢇimes aꢉꢉly to ꢄoth high clamꢉ
ꢏshownꢐ and low clamꢉ.
0
0
t
t
Figure 17: Delay to Clamp
Figure 16: Response Time (tRESPONSE)
17
Allegro MicroSystems
955 Perimeter Road
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Coreless, High Precision, Hall-Effect Current Sensor IC
with Common-Mode Field Rejection and High Bandwidth (240 kHz)
ACS37612
APPLICATION INFORMATION
Typical Application – Busbar Sensing
Figure 18: Busbar current sensing application – reference busbar design
The ACS37612 is ideal for busbar current sensing applications.
evaluation board designed to measure ±1000 A.
For a given current flowing through the busbar, the magnitude of
the differential magnetic field sensed by the IC will depend on
the air gap between the busbar and the IC.
Note: Comparing the busbar described in Figure 18 to a bare bus-
bar (without notch), the busbar with the 3 mm notch increased the
overall impedance by less than 1 µΩ, increasing busbar tempera-
ture by only few degrees during testing.
Adding a notch (width reduction) to the busbar at the location
where the sensor is placed significantly increases the magnitude
of the magnetic field, improving SNR. Keeping the notch length
short (2 to 3 mm) results in virtually no increase in the resistance
of the busbar or degradation of its thermal performance.
Skin Effect Consideration
Skin effect in the conductor will tend to reduce the magnitude
of the differential magnetic field measured by the IC at high
frequencies (coupling factor) and therefore will influence the
bandwith of the system and response time to transient current.
Different busbar and notch dimensions can be used to optimize
system performance and respond to application constraints.
Skin effect will depend on busbar dimensions, sensor mounting
orientation, and distance between the busbar and the IC.
Figure 18 and Table 1 highlight the dimensions of an Allegro
Table 1: Current range based on reference busbar design:
Busbar Application
Maximum Current (A) Coupling Factor at 2.5 mm Crystal Air Gap [1] Differential Field (G) IC Sensitivity (mV/G)
18 × 3 mm Busbar
+ 3 mm Notch
±1000 0.19 ±190 10
[1] Crystal air gap is defined as the distance from the busbar surface to the device sensing elements (considering active area depth).
18
Allegro MicroSystems
955 Perimeter Road
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www.allegromicro.com
Coreless, High Precision, Hall-Effect Current Sensor IC
with Common-Mode Field Rejection and High Bandwidth (240 kHz)
ACS37612
Multiple Busbar Design Options
The ACS37612 device offers many different mounting possibili-
ties, addressing different needs (bandwidth, mounting tolerances,
crosstalk). The figures below show different mounting options.
Refer to Allegro’s website for application notes explaining the
tradeoffs between different topologies.
Figure 19: Rift Busbar Design
Figure 20: Slit Busbar Design
Figure 21: Dual Vertical Slit Busbar Design
Figure 22: Vertical Slit Busbar Design
19
Allegro MicroSystems
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
Coreless, High Precision, Hall-Effect Current Sensor IC
with Common-Mode Field Rejection and High Bandwidth (240 kHz)
ACS37612
Typical Application – PCB Sensing
Figure 23: PCB Current sensing application – 6-Layer reference PCB example
The ACS37612 can be used in applications where hundreds of
amps flow through a PCB.
Care must be taken when routing the device signal to prevent
noise coupling to the supply or output lines.
Multiple copper layers can be used to carry the current. Reduc-
ing the width of the copper traces under the sensor (neckdown)
increases the magnitude of the differential magnetic field mea-
sured by the IC.
Power plane in the neckdown area should also be avoided to
prevent disturbing the magnetic field measured.
Skin Effect Consideration
Different copper layer dimensions and stackups can be used to
optimize performance and respond to application constraints. For
example, in higher voltage applications, the top layer would only
be used for signal routing in order to use the PCB insulation for
isolation.
Skin effect in the conductor will tend to reduce the magnitude
of the differential magnetic field measured by the IC at high
frequencies (coupling factor) and therefore will influence the
bandwith of the system and response time to transient current.
Skin effect will depend on PCB copper trace dimensions, number
of layers, and layer thickness.
Figure 23 and Table 2 highlight the dimensions of three Allegro
evaluation boards designed to measure a wide current range.
Table 2: Current range based on reference PCB design:
PCB Application [1]
Maximum Current (A) [2] Coupling Factor (G/A) Differential Field (G) IC Sensitivity (mV/G)
5 Layers – Reference Design 3.5 mm – 015B5
5 Layers – Reference Design 3.5 mm – 010B5
5 Layers – Reference Design 4.5 mm – 015B5
5 Layers – Reference Design 4.5 mm – 010B5
5 Layers – Reference Design 7 mm – 015B5
5 Layers – Reference Design 7 mm – 010B5
±190
±270
±235
±350
±500
±750
0.74
0.74
±133
±200
±133
±200
±133
±200
15
10
15
10
15
10
0.57
0.57
0.265
0.265
[1] Maximum continuous current without proper cooling on these PCB designs should not exceed 200 A.
[2] Full-scale current is required to cover the full-scale output range (bidirectional = ±2 V).
20
Allegro MicroSystems
955 Perimeter Road
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www.allegromicro.com
Coreless, High Precision, Hall-Effect Current Sensor IC
with Common-Mode Field Rejection and High Bandwidth (240 kHz)
ACS37612
PACKAGE OUTLINE DRAWING
For Reference Only – Not for Tooling Use
(Reference MO-153 AA)
NOT TO SCALE
Dimensions in millimeters
Dimensions exclusive of mold flash, gate burrs, and dambar protrusions
Exact case and lead configuration at supplier discretion within limits shown
3.00 0.10
D
0.45
0.65
8º
8
0º
8
0.20
0.09
1.70
E
E
E2
E1
4.40 0.10
1.87
E
6.40 BSC
6.10
3.15
E
+0.15
–0.10
0.60
A
1
1.27
1.00 REF
2
1.70
1
2
0.25 BSC
E
B
PCB Layout Reference View
SEATING PLANE
GAUGE PLANE
Branded Face
C
8×
1.10 MAX
0.10
C
SEATING
PLANE
XXX
0.30
0.19
0.15
0.05
Date Code
0.65 BSC
A
Terminal #1 mark area
B
Reference land pattern layout (reference IPC7351 SOP65P640X110-8M); all pads a minimum of 0.20 mm from all adjacent pads;
adjust as necessary to meet application process requirements and PCB layout tolerances; when mounting on a multilayer PCB,
thermal vias can improve thermal dissipation (reference EIA/JEDEC Standard JESD51-5)
C Standard Branding Reference View
Line 1: Maximum 3 characters
Line 2: Maximum 5 characters
C
Branding scale and appearance at supplier discretion
Line 1: Part Number
Line 2: Logo A, 4-digit Date Code
D
E
Active Area Depth 0.36 mm REF
Hall elements (E1, E2); not to scale.
Figure 24: Package LU, 8-Pin TSSOP Package
21
Allegro MicroSystems
955 Perimeter Road
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Coreless, High Precision, Hall-Effect Current Sensor IC
with Common-Mode Field Rejection and High Bandwidth (240 kHz)
ACS37612
Revision History
Number
Date
Description
–
March 9, 2020
Initial release
Copyright 2020, Allegro MicroSystems.
Allegro MicroSystems reserves the right to make, from time to time, such departures from the detail specifications as may be required to permit
improvements in the performance, reliability, or manufacturability of its products. Before placing an order, the user is cautioned to verify that the
information being relied upon is current.
Allegro’s products are not to be used in any devices or systems, including but not limited to life support devices or systems, in which a failure of
Allegro’s product can reasonably be expected to cause bodily harm.
The information included herein is believed to be accurate and reliable. However, Allegro MicroSystems assumes no responsibility for its use; nor
for any infringement of patents or other rights of third parties which may result from its use.
Copies of this document are considered uncontrolled documents.
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Allegro MicroSystems
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
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