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PDF 3517 Data sheet ( Hoja de datos )
| Número de pieza | 3517 | |
| Descripción | RATIOMETRIC/ LINEAR HALL-EFFECT SENSORS FOR HIGH-TEMPERATURE OPERATION | |
| Fabricantes | Allegro MicroSystems | |
| Logotipo |  |
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3517 AND
3518
RATIOMETRIC, LINEAR HALL-EFFECT SENSORS
FOR HIGH-TEMPERATURE OPERATION
The A3517xUA and A3518xUA are sensitive, temperature-stable linear
Hall-effect sensors with greatly improved offset characteristics. Ratiometric,
linear Hall-effect sensors provide a voltage output that is proportional to the
applied magnetic field and have a quiescent output voltage that is approxi-
mately 50% of the supply voltage. These magnetic sensors are ideal for use in
linear and rotary position sensing systems in the harsh environments of
automotive and industrial applications over extended temperatures to -40°C
and +150°C. The A3517xUA features an output sensitivity of 5 mV/G while
the A3518xUA has an output sensitivity of 2.5 mV/G. See the Magnetic
V
CC
Characteristics table for complete, individual device parametrics.
12
3
Each BiCMOS monolithic circuit integrates a Hall element, improved
temperature-compensating circuitry to reduce the intrinsic sensitivity drift of
the Hall element, a small-signal high-gain amplifier, and a rail-to-rail low-
impedance output stage.
Dwg. PH-006
Pinning is shown viewed from branded side.
A proprietary dynamic offset cancelation technique, with an internal high-
frequency clock, reduces the residual offset voltage, which is normally caused
by device overmolding, temperature dependancies, and thermal stress. This
technique produces devices that have an extremely stable quiescent output
voltage, are immune to mechanical stress, and have precise recoverability after
temperature cycling. Many problems normally associated with low-level
analog signals are minimized by having the Hall element and amplifier in a
single chip. Output precision is obtained by internal gain and offset trim
adjustments during the manufacturing process.
ABSOLUTE MAXIMUM RATINGS
Supply Voltage, VCC ......................... 8.0 V
Output Voltage, VO ........................... 8.0 V
Output Sink Current, IO .................. 10 mA
Magnetic Flux Density, B ......... Unlimited
Package Power Dissipation,
PD .................................... See Graph
Operating Temperature Range*, TA
Suffix S– .................... -20°C to +85°C
Suffix L– .................... -40°C to +150°C
Storage Temperature Range,
TS ............................. -65°C to +170°C
* Infrequent excursions permitted; see
Applications Information.
These reduced-cost devices are supplied in a 3-pin ultra-mini-SIP “UA”
package only.
FEATURES
I Temperature-Stable Quiescent Output Voltage
I Precise Recoverability After Temperature Cycling
I Output Voltage Proportional to Applied Magnetic Field
I Ratiometric Rail-to-Rail Output
I Improved Sensitivity
I 4.5 V to 5.5 V Operation
I Immune to Mechanical Stress
I Small Package Size
I Solid-State Reliability
Always order by complete part number, e.g., A3517SUA .
1 page  
3517 AND 3518
RATIOMETRIC,
LINEAR HALL-EFFECT SENSORS
FOR HIGH-TEMP. OPERATION
CHARACTERISTICS DEFINITIONS
Quiescent Voltage Output. In the quiescent state (no
magnetic field), the output is ideally equal to one-half of
the supply voltage over the operating voltage and tem-
perature range (VOQ ≈ VCC/2). Due to internal component
tolerances and thermal considerations, there is a tolerance
on the quiescent voltage output and on the quiescent
voltage output as a function of supply voltage and ambient
temperature. For purposes of specification, the quiescent
voltage output as a function of temperature is defined as
∆VOQ(∆T)
=
VOQ(TA) – VOQ(25°C)
Sens(25°C)
(1)
This calculation yields the device’s equivalent
accuracy, over the operating temperature range, in gauss.
Sensitivity. The presence of a south-pole magnetic field
perpendicular to the package face (the branded surface)
will increase the output voltage from its quiescent value
toward the supply voltage rail by an amount proportional to
the magnetic field applied. Conversely, the application of
a north pole will decrease the output voltage from its
quiescent value. This proportionality is specified as the
sensitivity of the device and is defined as
Sens = VO(500G) – VO(-500G)
1000 G
(2)
The stability of sensitivity as a function of tempera-
ture is defined as
∆Sens(∆T)
= Sens(TA) – Sens(25°C)
Sens(25°C)
x 100%
(3)
Ratiometry. The A3517xUA and A3518xUA feature a
ratiometric output. The quiescent voltage output and
sensitivity are proportional to the supply voltage
(ratiometric).
The per cent ratiometric change in the quiescent
voltage output is defined as
∆VOQ(∆V)
=
VOQ(VCC)
VCC
/
/
VOQ(5V)
5V
x 100%
(4)
and the per cent ratiometric change in sensitivity is defined
as
∆Sens(∆V)
=
Sens(VCC)
VCC /
/ Sens(5V)
5V
x 100%
(5)
Linearity and Symmetry. The on-chip output stage is
designed to provide a linear output to within 500 mV of
either rail with a supply voltage of 5 V. This is equivalent
to approximately ±800 gauss of ambient field. Although
application of stronger magnetic fields will not damage
these devices, it will force the output into a non-linear
region. Linearity in per cent is measured and defined as
Lin+ = VO(500G) – VOQ x 100%
2 (VO(250G) – VOQ)
(6)
Lin– = VO(-500G) – VOQ x 100%
2 (VO(-250G) – VOQ)
and output symmetry as
(7)
Sym = VO(500G) – VOQ x 100%
VOQ – VO(-500G)
(8)
www.allegromicro.com
5
5 Page 
3517 AND 3518
RATIOMETRIC,
LINEAR HALL-EFFECT SENSORS
FOR HIGH-TEMP. OPERATION
Surface-Mount Lead Form (add ‘-TL’ to part number)
Dimensions in Inches
(controlling dimensions)
0.095
±0.005
Dimensions in Millimeters
(for reference only)
2.41
±0.13
0.002
MAX
0.051
MAX
0.004 0°–8°
MAX
0.020
MIN
FLAT
Dwg. MH-015 in
NOTE: Supplied in bulk pack (500 devices per bag).
0.10 0°–8°
MAX
0.51
MIN
FLAT
Dwg. MH-015 mm
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 appliances, devices, or systems without express written
approval.
The information included herein is believed to be accurate and
reliable. However, Allegro MicroSystems, Inc. assumes no responsibil-
ity for its use; nor for any infringements of patents or other rights of
third parties that may result from its use.
11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet 3517.PDF ] | |
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