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Product Bulletin OHS3150U/3151U August 1999
Ratiometric Linear Hall Effect Sensor
Types OHS3150U, OHS3151U
Features *A ratiometric linear output capable of
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.
Absolute Maximum Ratings
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
Functional Block Diagram
VCC
Voltage Reg
Quad - Hall + Sensor
Linear Amp
OUT
GND
DSC = Dual to Single Converter
Optek Technology, Inc.
1215 W. Crosby Road
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
VCC ICC VOQ
PARAMETER
Supply Voltage Supply Current Quiescent Voltage Output
MIN TYP MAX UNITS
4.5 5.0 5.5 2.25 2.10 2.5 2.5 6.0 10 2.75 2.90 V mA V V mA mA
TEST CONDITIONS
VCC = 6 V, IO = 0 mA, B = OG B = OG, TA = 25o C B = OG
IO IO
Sink Current Source Current
0.5 -1.0
(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 Sens
PARAMETER
Operating Temperature Range Sensitivity @ TA = 25o C over TA Sens Change @ TA > 25o C @ TA < 25o C VOQ Change over TA Ratiometric Sens Change Ratiometric VOQ Change Positive Lin 25 < 25 Negative Lin 25 < 25 Output Symmetry
OHS3150U
MIN -40 2.25 2.0 -5 -12 2.5 TYP MAX 150 2.75 3.0 10 3 35 100 100 95 90 95 90 90 100 105 105 105 105 110 95 90 95 90 90 MIN -40 2.25 2.0 -5 -12
OHS3151U
TYP MAX 150 2.5 2.75 3.0 10 3 50 100 100 105 105 105 105 100 110
UNITS
o
C
mV/G mV/G % % G % % % % %
Sens(T) VOQ(T) Sens(V) VOQ(V) +Lin -Lin Sym
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' equivalent accuracy and is specified in Gauss by the calculation. s
VOQ(T) = VOQ(TA) - VOQ(25o C) Sens (25o C)
Sensitivity: A magnetic south pole at and perpendicular to the device' symbolized package s 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(T) = Sens (TA) - Sens (25o C) X 100% Sens(25o C)
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 = - Lin = VO(500G) - VOQ 2(VO[250G] - VOQ) VO(-500G) - VOQ 2(VO[-250G] - VOQ)
X 100% X 100%
The output symmetry is also specified in percent by the calculation
Sym =
VO(500G) - VOQ VOQ - VO(-500G)
X 100%
Optek Technology, Inc.
1215 W. Crosby Road
Carrollton, Texas 75006 43
(972)323-2200
Fax (972)323-2396

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