Allegro Multimedia Stud Sensor A1302 User Manual

A1301 and A1302  
Continuous-Time Ratiometric Linear Hall Effect Sensors  
Features and Benefits  
Description  
Low-noise output  
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.  
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  
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.  
Packages: 3 pin SOT23W (suffix LH), and  
3 pin SIP (suffix UA)  
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.  
Not to scale  
Functional Block Diagram  
V+  
VCC  
Voltage  
Regulator  
VOUT  
Out  
Amp  
Gain  
Offset  
C
BYPASS  
Trim  
Control  
GND  
A1301-DS, Rev. 5  
 
A1301 and  
A1302  
Continuous-Time Ratiometric  
Linear Hall Effect Sensors  
DEVICE CHARACTERISTICS over operating temperature range, TA, and VCC = 5 V, unless otherwise noted  
Characteristic  
Electrical Characteristics  
Supply Voltage  
Symbol  
Test Conditions  
Min.  
Typ.  
Max.  
Units  
VCC  
ICC  
Running, TJ < 165°C  
Output open  
4.5  
6
11  
V
mA  
V
Supply Current  
VOUT(High) ISOURCE = –1 mA, Sens = nominal  
VOUT(Low) ISINK = 1 mA, Sens = nominal  
BW  
4.65  
4.7  
0.2  
20  
Output Voltage  
0.25  
V
Output Bandwidth  
Power-On Time  
kHz  
VCC(min) to 0.95 VOUT; B = ±1400 G;  
tPO  
3
2
5
5
μs  
Ω
Slew rate = 4.5 V/μs to 4.5 V/100 ns  
Output Resistance  
Wide Band Output Noise, rms  
ROUT  
ISINK 1 mA, ISOURCE –1 mA  
External output low pass filter 10 kHz;  
VOUTN  
150  
μV  
Sens = nominal  
Ratiometry  
Quiescent Output Voltage Error  
with respect to ΔVCC  
ΔVOUTQ(V) TA = 25°C  
ΔSens(V) TA = 25°C  
±3.0  
±3.0  
%
%
1
Magnetic Sensitivity Error with  
2
respect to ΔVCC  
Output  
Linearity  
Lin  
TA = 25°C  
TA = 25°C  
±2.5  
±3.0  
%
%
Symmetry  
Sym  
Magnetic Characteristics  
Quiescent Output Voltage  
VOUTQ  
B = 0 G; TA = 25°C  
2.4  
2.2  
2.5  
2.6  
2.8  
V
V
Quiescent Output Voltage over  
Operating Temperature Range  
VOUTQ(ΔT ) B = 0 G  
A
A1301; TA = 25°C  
2.0  
1.0  
2.5  
1.3  
3.0  
1.6  
mV/G  
mV/G  
mV/G  
mV/G  
Magnetic Sensitivity  
Sens  
A1302; TA = 25°C  
A1301  
1.8  
3.2  
Magnetic Sensitivity over  
Operating Temperature Range  
Sens(ΔT )  
A
A1302  
0.85  
1.75  
1Refer to equation (4) in Ratiometric section on page 4.  
2Refer to equation (5) in Ratiometric section on page 4.  
Allegro MicroSystems, Inc.  
115 Northeast Cutoff, Box 15036  
3
Worcester, Massachusetts 01615-0036 (508) 853-5000  
 
A1301 and  
A1302  
Continuous-Time Ratiometric  
Linear Hall Effect Sensors  
Characteristic Definitions  
Ratiometric. The A1301 and A1302 feature a ratiometric  
output. This means that the quiescent voltage output, VOUTQ  
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, ΔVOUTQ, which is  
a function of both ΔVCC and ΔTA. For purposes of specifica-  
tion, the quiescent output voltage as a function of temperature,  
,
and the magnetic sensitivity, Sens, are proportional to the supply  
voltage, VCC  
.
The ratiometric change (%) in the quiescent voltage output is  
defined as:  
VOUTQ(V  
VOUTQ(5V)  
)
CC  
ΔVOUTQ(ΔV)  
(4)  
=
× 100%  
ΔVOUTQ(ΔT ), is defined as:  
VCC  
5 V  
A
and the ratiometric change (%) in sensitivity is defined as:  
VOUTQ(Τ  
VOUTQ(25ºC)  
)
Α
(1)  
ΔVOUTQ(ΔΤ  
=
)
Α
Sens(V  
Sens(5V)  
)
CC  
Sens(25ºC)  
(5)  
ΔSens(ΔV)  
=
× 100%  
VCC  
5 V  
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.  
Linearity and Symmetry. The on-chip output stage is  
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:  
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:  
VOUT(+B) VOUTQ  
Lin+  
=
× 100%  
(6)  
(7)  
2 (VOUT(+B½) – VVOUTQ  
)
VOUT(–B) VOUT(+B)  
VOUT(–B) VOUTQ  
(2)  
Sens  
=
Lin–  
=
2B  
× 100%  
× 100%  
2(VOUT(–B½) – VOUTQ  
)
The stability of the device magnetic sensitivity as a function of  
and output symmetry as:  
ambient temperature, ΔSens(ΔT ) (%) is defined as:  
A
VOUT(+B) VOUTQ  
Sens(Τ Sens(25ºC)  
)
Α
(8)  
(3)  
ΔSens(ΔΤ  
Sym  
× 100%  
=
=
)
Α
VOUTQ – VOUT(–B)  
Sens(25ºC)  
Allegro MicroSystems, Inc.  
115 Northeast Cutoff, Box 15036  
4
Worcester, Massachusetts 01615-0036 (508) 853-5000  
 
A1301 and  
A1302  
Continuous-Time Ratiometric  
Linear Hall Effect Sensors  
Typical Characteristics  
(30 pieces, 3 fabrication lots)  
1301 Device Sensitivity vs. Ambient Temperature  
1302 Device Sensitivity vs. Temperature  
1.40  
1.38  
1.36  
1.34  
1.32  
1.30  
1.28  
1.26  
1.24  
2.65  
2.60  
2.55  
2.50  
2.45  
2.40  
UA Package  
UA Package  
LH Package  
LH Package  
2.35  
-50 -25  
0
25 50 75 100 125 150  
Temperature (°C)  
–50 –25  
0
25 50 75 100 125 150  
Temperature (°C)  
1301 Device VOUTQ vs. Ambient Temperature  
1302 Device VOUTQ vs. Ambient Temperature  
2.60  
2.55  
2.50  
2.45  
2.40  
2.60  
2.55  
2.50  
2.45  
2.40  
–50 –25  
0
25  
50  
75 100 125 150  
–50 –25  
0
25  
50  
75 100 125 150  
Temperature (°C)  
Temperature (°C)  
1301 Device Sensitivity vs. Supply Voltage  
1302 Device Sensitivity vs. Supply Voltage  
1.7  
1.6  
1.5  
1.4  
1.3  
1.2  
1.1  
1.0  
3.5  
3.0  
2.5  
2.0  
1.5  
4.5  
5.0 5.5  
Supply Voltage (V)  
6.0  
4.5  
5.0  
5.5  
6.0  
Supply Voltage (V)  
Continued on the next page...  
Allegro MicroSystems, Inc.  
115 Northeast Cutoff, Box 15036  
5
Worcester, Massachusetts 01615-0036 (508) 853-5000  
 
A1301 and  
A1302  
Continuous-Time Ratiometric  
Linear Hall Effect Sensors  
Typical Characteristics, continued  
(30 pieces, 3 fabrication lots)  
1302 Device VOUTQ vs. Supply Voltage  
1301 Device VOUTQ vs. Supply Voltage  
3.5  
3.0  
2.5  
2.0  
1.5  
3.5  
3.0  
2.5  
2.0  
1.5  
4.5  
5.0  
5.5  
6.0  
4.5  
5.0  
5.5  
6.0  
Supply Voltage (V)  
Supply Voltage (V)  
1302 Device LIN+ and LIN– vs. Supply Voltage  
1301 Device LIN+ and LIN– vs. Supply Voltage  
100.4  
100.3  
100.2  
100.1  
100.0  
99.9  
100.0  
99.9  
99.8  
99.7  
99.6  
LIN+  
LIN–  
LIN–  
LIN+  
99.8  
4.5  
5.0  
5.5  
6.0  
4.5  
5.0  
5.5  
6.0  
Supply Voltage (V)  
Supply Voltage (V)  
1302 Device Symmetry vs. Supply Voltage  
1301 Device Symmetry vs. Supply Voltage  
100.0  
99.9  
99.8  
99.7  
99.6  
99.5  
99.4  
99.3  
99.2  
99.1  
99.0  
100.5  
100.4  
100.3  
100.2  
100.1  
100.0  
99.9  
99.8  
99.7  
99.6  
99.5  
4.5  
5.0  
5.5  
6.0  
4.5  
5.0  
Supply Voltage (V)  
5.5  
6.0  
Supply Voltage (V)  
Allegro MicroSystems, Inc.  
115 Northeast Cutoff, Box 15036  
6
Worcester, Massachusetts 01615-0036 (508) 853-5000  
 
A1301 and  
A1302  
Continuous-Time Ratiometric  
Linear Hall Effect Sensors  
Package LH, 3-Pin; (SOT-23W)  
3.00 .118  
2.70 .106  
0.15 [.006] M  
C
A
B
3.04 .120  
2.80 .110  
A
1.49 .059  
NOM  
8º  
0º  
B
B
A
3
0.20 .008  
0.08 .003  
2.10 .083  
1.85 .073  
A
0.96 .038  
A NOM  
Preliminary dimensions, for reference only  
Dimensions in millimeters  
U.S. Customary dimensions (in.) in brackets, for reference only  
(reference JEDEC TO-236 AB, 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  
0.60 .024  
0.25 .010  
1
2
A
B
Hall element (not to scale)  
0.25 .010  
Active Area Depth 0.28 [.011]  
C
3X  
SEATING PLANE  
GAUGE PLANE  
SEATING  
PLANE  
0.10 [.004]  
C
0.50 .020  
0.30 .012  
3X  
1.17 .046  
0.75 .030  
0.20 [.008] M  
C
A
B
0.15 .006  
0.00 .000  
0.95 .037  
1.90 .075  
Pin-out Drawings  
Package UA  
Package LH  
3
1
2
1
2
3
Terminal List  
Number  
Symbol  
Description  
Package LH  
Package UA  
VCC  
VOUT  
GND  
1
2
3
1
3
2
Connects power supply to chip  
Output from circuit  
Ground  
Allegro MicroSystems, Inc.  
7
115 Northeast Cutoff, Box 15036  
Worcester, Massachusetts 01615-0036 (508) 853-5000  
 
A1301 and  
A1302  
Continuous-Time Ratiometric  
Linear Hall Effect Sensors  
Package UA, 3-Pin SIP  
.164 4.17  
.159 4.04  
C
D
.0805 2.04  
NOM  
.062 1.57  
.058 1.47  
D
1.44  
.0565  
NOM  
.122 3.10  
.117 2.97  
B
.085 2.16  
MAX  
.031 0.79  
REF  
A
.640 16.26  
.600 15.24  
.017 0.44  
.014 0.35  
1
2
3
.019 0.48  
.014 0.36  
.050 1.27  
NOM  
Dimensions in inches  
Metric dimensions (mm) in brackets, for reference only  
A
Dambar removal protrusion (6X)  
Ejector mark on opposite side  
B
C
D
Active Area Depth .0195 [0.50] NOM  
Hall element (not to scale)  
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.  
Allegro MicroSystems, Inc.  
115 Northeast Cutoff, Box 15036  
8
Worcester, Massachusetts 01615-0036 (508) 853-5000  
 

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