Allegro MicroSystems A1301 User manual

Description
TheA1301 andA1302 are continuous-time, ratiometric, linear
Hall-effect sensors. They are optimized to accurately provide
a voltage output that is proportional to an applied magnetic
field. These devices have a quiescent output voltage that is
50% of the supply voltage. Two output sensitivity options are
provided: 2.5 mV/G typical for the A1301, and 1.3 mV/G
typical for the A1302.
The Hall-effect integrated circuit included in each device
includes a Hall sensing element, a linear amplifier, and a
CMOS Class A output structure. Integrating the Hall sensing
element and the amplifier on a single chip minimizes many
of the problems normally associated with low voltage level
analog signals.
High precision in output levels is obtained by internal gain
and offset trim adjustments made at end-of-line during the
manufacturing process.
These features make the A1301 and A1302 ideal for use in
position sensing systems, for both linear target motion and
rotational target motion. They are well-suited for industrial
applications over extended temperature ranges, from –40°C
to 125°C.
Two device package types are available: LH, a 3-pin SOT23W
type for surface mount, and UA, a 3-pin ultramini SIP for
through-hole mount. They are lead (Pb) free (suffix, –T) with
100% matte tin plated leadframes.
A1301-DS, Rev. 5
Features and Benefits
▪Low-noise output
▪Fast power-on time
▪Ratiometric rail-to-rail output
▪4.5 to 6.0 V operation
▪Solid-state reliability
▪Factory-programmed at end-of-line for optimum
performance
▪Robust ESD performance
Continuous-Time Ratiometric Linear Hall Effect Sensors
Functional Block Diagram
Not to scale
Packages: 3 pin SOT23W (suffix LH), and
3 pin SIP (suffix UA)
A1301 and A1302
Amp
GND
VOUT
VCC
Out
Offset
Tri m
Control
Gain
V+
Voltage
Regulator
Filter
CBYPASS

Continuous-Time Ratiometric
Linear Hall Effect Sensors
A1301 and
A1302
2
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]
www.allegromicro.com
Selection Guide
Part Number Pb-free1Packing2Package Ambient, TASensitivity (Typical)
A1301ELHLT-T Yes 7-in. tape and reel, 3000 pieces/reel Surface Mount –40ºC to 85ºC
2.5 mV/G
A1301EUA-T Yes Bulk, 500 pieces/bag SIP
A1301KLHLT-T Yes 7-in. tape and reel, 3000 pieces/reel Surface Mount –40ºC to 125ºC
A1301KUA-T Yes Bulk, 500 pieces/bag SIP
A1302ELHLT-T Yes 7-in. tape and reel, 3000 pieces/reel Surface Mount –40ºC to 85ºC
1.3 mV/G
A1302EUA-T Yes Bulk, 500 pieces/bag SIP
A1302KLHLT-T Yes 7-in. tape and reel, 3000 pieces/reel Surface Mount –40ºC to 125ºC
A1302KUA-T Yes Bulk, 500 pieces/bag SIP
1Pb-based variants are being phased out of the product line. Certain variants cited in this footnote are no longer in production The variants should
not be purchased for new design applications. Samples are no longer available. Status change: May 1, 2006. These variants include: A1301ELHLT,
A1301EUA, A1301KLHLT, A1301KUA, A1302ELHLT, A1302EUA, A1302KLHLT, and A1302KUA.
2Contact Allegro for additional packing options.
Absolute Maximum Ratings
Characteristic Symbol Notes Rating Units
Supply Voltage VCC 8V
Output Voltage VOUT 8V
Reverse Supply Voltage VRCC –0.1 V
Reverse Supply Voltage VRCC –0.1 V
Output Sink Current IOUT 10 mA
Operating Ambient Temperature TA
Range E –40 to 85 ºC
Range K –40 to 125 ºC
Maximum Junction Temperature TJ(max) 165 ºC
Storage Temperature Tstg –65 to 170 ºC

Continuous-Time Ratiometric
Linear Hall Effect Sensors
A1301 and
A1302
3
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]
www.allegromicro.com
DEVICE CHARACTERISTICS over operating temperature range, TA, and VCC = 5 V, unless otherwise noted
Characteristic Symbol Test Conditions Min. Typ. Max. Units
Electrical Characteristics
Supply Voltage VCC Running, TJ< 165°C 4.5 – 6 V
Supply Current ICC Output open – – 11 mA
Output Voltage VOUT(High) ISOURCE = –1 mA, Sens = nominal 4.65 4.7 – V
VOUT(Low) ISINK = 1 mA, Sens = nominal – 0.2 0.25 V
Output Bandwidth BW – 20 – kHz
Power-On Time tPO
VCC(min) to 0.95 VOUT; B = ±1400 G;
Slew rate = 4.5 V/μs to 4.5 V/100 ns –35μs
Output Resistance ROUT ISINK ≤1 mA, ISOURCE ≥–1 mA – 2 5 Ω
Wide Band Output Noise, rms VOUTN
External output low pass filter ≤10 kHz;
Sens = nominal – 150 – μV
Ratiometry
Quiescent Output Voltage Error
with respect to ΔVCC1ΔVOUTQ(V) TA= 25°C – – ±3.0 %
Magnetic Sensitivity Error with
respect to ΔVCC2ΔSens(V) TA= 25°C – – ±3.0 %
Output
Linearity Lin TA= 25°C – – ±2.5 %
Symmetry Sym TA= 25°C – – ±3.0 %
Magnetic Characteristics
Quiescent Output Voltage VOUTQ B = 0 G; TA= 25°C 2.4 2.5 2.6 V
Quiescent Output Voltage over
Operating Temperature Range VOUTQ(ΔTA)B = 0 G 2.2 – 2.8 V
Magnetic Sensitivity Sens A1301; TA= 25°C 2.0 2.5 3.0 mV/G
A1302; TA= 25°C 1.0 1.3 1.6 mV/G
Magnetic Sensitivity over
Operating Temperature Range Sens(ΔTA)
A1301 1.8 – 3.2 mV/G
A1302 0.85 – 1.75 mV/G
1Refer to equation (4) in Ratiometric section on page 4.
2Refer to equation (5) in Ratiometric section on page 4.

Continuous-Time Ratiometric
Linear Hall Effect Sensors
A1301 and
A1302
4
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]
www.allegromicro.com
Characteristic Definitions
Quiescent Output Voltage. In the quiescent state (no sig-
nificant magnetic field: B = 0), the output, VOUTQ, equals one
half of the supply voltage, VCC, throughout the entire operating
ranges of VCC and ambient temperature, TA. Due to internal
component tolerances and thermal considerations, there is a
tolerance on the quiescent output voltage, ΔV
OUTQ, which is
a function of both ΔV
CC and ΔTA. For purposes of specifica-
tion, the quiescent output voltage as a function of temperature,
ΔV
OUTQ(ΔTA), is defined as:
where Sens is in mV/G, and the result is the device equivalent
accuracy, in gauss (G), applicable over the entire operating tem-
perature range.
Sensitivity. The presence of a south-polarity (+B) magnetic
field, perpendicular to the branded face of the device package,
increases the output voltage, VOUT, in proportion to the magnetic
field applied, from VOUTQ toward the VCC rail. Conversely, the
application of a north polarity (–B) magnetic field, in the same
orientation, proportionally decreases the output voltage from its
quiescent value. This proportionality is specified as the magnetic
sensitivity of the device and is defined as:
The stability of the device magnetic sensitivity as a function of
ambient temperature, ΔSens ( ΔTA)(%) is defined as:
Ratiometric. The A1301 and A1302 feature a ratiometric
output. This means that the quiescent voltage output, VOUTQ,
and the magnetic sensitivity, Sens, are proportional to the supply
voltage, VCC.
The ratiometric change (%) in the quiescent voltage output is
defined as:
and the ratiometric change (%) in sensitivity is defined as:
Linearity and Symmetry. The on-chip output stage is
designed to provide linear output at a supply voltage of 5 V.
Although the application of very high magnetic fields does not
damage these devices, it does force their output into a nonlinear
region. Linearity in percent is measured and defined as:
and output symmetry as:
ΔVOUTQ(ΔΤΑ)Sens(25ºC)
VOUTQ(ΤΑ)VOUTQ(25ºC)
–
=(1)
2B
VOUT(–B) VOUT(+B)
Sens
–
=
ΔSens(ΔΤΑ)
Sens(ΤΑ)Sens(25ºC)
Sens(25ºC)
–
=× 100%
(2)
(3)
V
CC
5V
V
OUTQ(V
CC
)
V
OUTQ(5V)
ΔV
OUTQ(ΔV)
=× 100%
(4)
VCC 5V
=× 100%
ΔSens(ΔV)
Sens(VCC)Sens(5V)
(5)
=× 100%
Lin+
2 (VOUT(+B½) –V
VOUTQ )
–
VOUT(+B) VOUTQ
(6)
=× 100%
Lin–
2(VOUT(–B½) –V
OUTQ)
–
VOUT(–B) VOUTQ
(7)
–
=× 100%
Sym
VOUT(+B)
VOUTQ –V
OUT(–B)
VOUTQ
(8)

Continuous-Time Ratiometric
Linear Hall Effect Sensors
A1301 and
A1302
5
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]
www.allegromicro.com
Typical Characteristics
(30 pieces, 3 fabrication lots)
Continued on the next page...
2.35
2.40
2.45
2.50
2.55
2.60
2.65
–50
–25 0 25 50 75 100 125 150
1.24
1.26
1.28
1.30
1.32
1.34
1.36
1.38
1.40
-50
-25 0 25 50 75 100 125 150
2.40
2.45
2.50
2.55
2.60
–50 –25 0 25 50 75 100 125 150
2.40
2.45
2.50
2.55
2.60
–50 –25 0 25 50 75 100 125 150
4.5 5.0 5.5 6.0
4.5 5.0 5.5 6.0
LH Package
UA Package
LH Package
UA Package
1301 Device Sensitivity vs. Ambient Temperature 1302 Device Sensitivity vs. Temperature
Temperature (°C) Temperature (°C)
1301 Device VOUTQ vs. Ambient Temperature 1302 Device VOUTQ vs. Ambient Temperature
1301 Device Sensitivity vs. Supply Voltage 1302 Device Sensitivity vs. Supply Voltage
Supply Voltage (V)
Supply Voltage (V)
Temperature (°C)
Temperature (°C)
Sensitivity (mV/G)
Sensitivity (mV/G)
Output Voltage (V)
Output Voltage (V)
Sensitivity (mV/G)
Sensitivity (mV/G)
1.5
2.0
2.5
3.0
3.5
1.0
1.1
1.2
1.3
1.4
1.5
1.6
1.7

Continuous-Time Ratiometric
Linear Hall Effect Sensors
A1301 and
A1302
6
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]
www.allegromicro.com
Typical Characteristics, continued
(30 pieces, 3 fabrication lots)
1301 Device VOUTQ vs. Supply Voltage
4.5 5.0 5.5 6.0 1.5
2.0
2.5
3.0
3.5
4.5 5.0 5.5 6.0
4.5 5.0 5.5 6.0
4.5 5.0 5.5 6.0
99.0
99.1
99.2
99.3
99.4
99.5
99.6
99.7
99.8
99.9
100.0
4.5 5.0 5.5 6.0
99.5
99.6
99.7
99.8
99.9
100.0
100.1
100.2
100.3
100.4
100.5
4.5 5.0 5.5 6.0
Supply Voltage (V)
LIN–
LIN+
LIN–
LIN+
99.6
99.7
99.8
99.9
100.0
99.8
99.9
100.0
100.1
100.2
100.3
100.4
1302 Device VOUTQ vs. Supply Voltage
1301 Device Symmetry vs. Supply Voltage 1302 Device Symmetry vs. Supply Voltage
1301 Device LIN+ and LIN– vs. Supply Voltage 1302 Device LIN+ and LIN– vs. Supply Voltage
Output Voltage (V)
Output Voltage (V)
Linearity (%)
Linearity (%)
Symmetry (%)
Symmetry (%)
Supply Voltage (V) Supply Voltage (V)
Supply Voltage (V)
Supply Voltage (V)
Supply Voltage (V)
1.5
2.0
2.5
3.0
3.5

Continuous-Time Ratiometric
Linear Hall Effect Sensors
A1301 and
A1302
7
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]
www.allegromicro.com
Package LH, 3-Pin; (SOT-23W)
0.15
0.00 .006 .000
1.17
0.75 .046 .030
0.50
0.30 .020 .012
2.10
1.85 .083 .073
3.00
2.70 .118 .106
1.49
NOM .059
0.96
NOM .038
0.20
0.08 .008 .003
8º
0º
0.60
0.25 .024 .010
C
SEATING
PLANE
A
B
3X
0.20 [.008] M C A B
0.15 [.006] M C A B
C0.10 [.004]
3X
0.95 .037
1.90 .075
0.25 .010
3.04
2.80 .120 .110
21
3
GAUGE PLANE
SEATING PLANE
B
A
B
Preliminary dimensions, for reference only
Dimensions in millimeters
U.S. Customary dimensions (in.) in brackets, for reference only
(reference JEDEC TO-236AB, except case width and terminal tip-to-tip)
Dimensions exclusive of mold flash, gate burrs, and dambar protrusions
Exact case and lead configuration at supplier discretion within limits shown
Hall element (not to scale)
ActiveArea Depth 0.28 [.011]
A
A
A
Terminal List
Symbol Number Description
Package LH Package UA
VCC 1 1 Connects power supply to chip
VOUT 2 3 Output from circuit
GND 3 2 Ground
Package LH Package UA
Pin-out Drawings
231
21
3

Continuous-Time Ratiometric
Linear Hall Effect Sensors
A1301 and
A1302
8
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]
www.allegromicro.com
The products described herein are manufactured under one or more of the following U.S. patents: 5,045,920; 5,264,783; 5,442,283;
5,389,889; 5,581,179; 5,517,112; 5,619,137; 5,621,319; 5,650,719; 5,686,894; 5,694,038; 5,729,130; 5,917,320; and other patents pending.
Allegro MicroSystems, Inc. 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 products are not authorized for use as critical components in life-support devices or systems without express written approval.
The information included herein is believed to be accurate and reliable. However, Allegro MicroSystems, Inc. assumes no responsibility for
its use; nor for any infringement of patents or other rights of third parties which may result from its use.
Copyright © 2005, 2006 Allegro MicroSystems, Inc.
Package UA, 3-Pin SIP
B
D
D
D
.164
.159
4.17
4.04
.122
.117
3.10
2.97
.062
.058
1.57
1.47
.017
.014
0.44
0.35
.019
.014
0.48
0.36
.640
.600
16.26
15.24
.085
MAX
2.16
.050
NOM
1.27
.031
REF
0.79
.0805
NOM
2.04
1.44
.0565
NOM
Dimensions in inches
Metric dimensions (mm) in brackets, for reference only
231
A
A
B
C
C
Dambar removal protrusion (6X)
Active Area Depth .0195 [0.50] NOM
DHall element (not to scale)
Ejector mark on opposite side