ETC OHS3150U Ra ti omet ric lin ear hall ef fect sen sor Datasheet

Product Bulletin OHS3150U/3151U
August 1999
Ratiometric Linear Hall Effect Sensor
Types OHS3150U, OHS3151U
Features
Absolute Maximum Ratings
• A ratiometric linear output capable of
Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 V
Storage Temperature Range, TS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -65o C to +170o C
Operating Temperature Range, TA (OHS prefix) . . . . . . . . . . . . . . . -40o C to +150o C
Lead Soldering Temperature (1/8 inch [3.2 mm] from case for 5 sec, with soldering
iron) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 260o C(1)
Power Dissipation, PD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100 mW
Output Current, IO. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 mA
Magnetic Flux Density, B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Unlimited
sinking and sourcing current
• 4.5 V to 6.0 V operation
• Responds equally to positive and
negative magnetic field
• Excellent temperature stability to
operate in harsh environments
• Robust package capable of
withstanding harsh environments
Description
The ratiometric linear Hall effect sensor each
contain a monolithic integrated circuit on a
single chip. The circuit incorporates a
quadratic Hall sensing element which
minimizes the effects of mechanical and
thermal stress on the Hall element and
temperature compensating circuitry to
compensate for the inherent Hall element
sensitivity change over temperature current.
These ratiometric linear Hall effect sensors
provide an output voltage that varies in
proportion to the applied magnetic field. The
voltage output will increase in response to a
south pole (positive) magnetic field applied
perpendicular to the package symbolization
face, and decrease in response to a north
pole (negative) magnetic field.
These 3150U & 3151U ratiometric linear Hall
effect sensors can be used as contactless
sensors for rotary and linear position sensing
and for current sensing. The devices in this
series are similar in performance except for
their allowable quiescent voltage output
change over the specified operating
temperature range.
Optek Technology, Inc.
Functional Block Diagram
1215 W. Crosby Road
VCC
Voltage
Reg
Quad
- Hall +
Sensor
Linear
Amp
OUT
GND
DSC = Dual to Single Converter
Carrollton, Texas 75006
41
(972)323-2200
Fax (972)323-2396
Type OHS3150U, OHS3151U
Electrical Characteristics (Over Operating Temperature Range, at VCC = 5 V, unless otherwise noted)
SYMBOL
PARAMETER
VCC
Supply Voltage
ICC
Supply Current
VOQ
Quiescent Voltage Output
MIN TYP MAX UNITS
4.5
TEST CONDITIONS
5.0
6.0
V
5.5
10
mA
2.25
2.5
2.75
V
B = OG, TA = 25o C
2.10
2.5
2.90
V
B = OG
IO
Sink Current
0.5
mA
IO
Source Current
-1.0
mA
VCC = 6 V, IO = 0 mA, B = OG
(1) Negative current is defined as coming out of (sourcing) the output.
Magnetic Characteristics (Over Operating Temperature, VCC = 5 V, IO = .5 mA)
SYMBOL
TA
PARAMETER
OHS3150U
MIN
TYP
OHS3151U
MAX
MIN
150
-40
2.75
3.0
2.25
2.0
10
3
-5
-12
TYP
MAX
o
Operating Temperature Range
-40
Sens
Sensitivity
@ TA = 25o C
over TA
2.25
2.0
∆Sens(∆T)
Sens Change
@ TA > 25o C
@ TA < 25o C
-5
-12
∆VOQ(∆T)
VOQ Change
over TA
∆Sens(∆V)
Ratiometric Sens Change
100
100
%
∆VOQ(∆V)
Ratiometric VOQ Change
100
100
%
2.5
150
UNITS
2.5
±35
C
2.75
3.0
mV/G
mV/G
10
3
%
%
±50
G
+Lin
Positive Lin ≥ 25
< 25
95
90
105
105
95
90
105
105
%
-Lin
Negative Lin ≥ 25
< 25
95
90
105
105
95
90
105
105
%
Sym
Output Symmetry
90
110
90
110
%
100
100
See characteristics definitions for test conditions and calculation formulas.
Optek reserves the right to make changes at any time in order to improve design and to supply the best product possible.
Optek Technology, Inc.
1215 W. Crosby Road
Carrollton, Texas 75006
(972)323-2200
Fax (972)323-2396
42
Type OHS3150U, OHS3151U
Characteristics Definitions
Quiescent Voltage Output: With no magnetic field present the device is in the quiescent state
and the voltage output is approximately equal to one-half the supply voltage (VOQ ≈VCC/2) over
the operating voltage and temperature range. The change in quiescent voltage output over
temperature gives the device’s equivalent accuracy and is specified in Gauss by the calculation.
∆VOQ(T) =
VOQ(TA) - VOQ(25o C)
Sens (25o C)
Sensitivity: A magnetic south pole at and perpendicular to the device’s symbolized package
face will increase the voltage output above the quiescent value. Conversely a magnetic north pole
will decrease the voltage output below the quiescent value. This change in voltage output with
applied magnetic field is sensitivity and is specified in mV/G by the calculation.
Sens =
VO(500G) - VO(-500G)
1000
The change in sensitivity over temperature is specified in percent by the calculation
Sens (TA) - Sens (25o C)
X 100%
Sens(25o C)
∆Sens(∆T) =
Ratiometry: The quiescent voltage output and sensitivity of these ratiometric linear Hall effect
devices are proportional to the supply voltage. The change in quiescent voltage output with
supply voltage is specified in percent by the calculation.
∆VOQ(∆V) =
VOQ(VCC) - VOQ(5 V)
VCC/5 V
X 100%
The change in sensitivity with supply voltage is also specified in percent by the calculation
∆Sens (∆V) =
Sens(VCC)/Sens (5 V)
X 100%
VCC/5 V
Linearity and Symmetry: The ability of the voltage output to vary in constant proportion to the
applied magnetic field is linearity and is specified in percent by the calculation
+ Lin
=
VO(500G) - VOQ
2(VO[250G] - VOQ)
X 100%
- Lin =
VO(-500G) - VOQ
2(VO[-250G] - VOQ)
X 100%
The output symmetry is also specified in percent by the calculation
Sym =
Optek Technology, Inc.
1215 W. Crosby Road
VO(500G) - VOQ
VOQ - VO(-500G)
X 100%
Carrollton, Texas 75006
43
(972)323-2200
Fax (972)323-2396
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