TLE4990E-6782 ,Programmable Linear Output Hall Sensorcharacteristics.Terms of delivery and rights to technical change reserved.We hereby disclaim any an ..
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TLE4990E-6782
Programmable Linear Output Hall Sensor
TLE4990
Programmable
Linear Output Hall Sensor
TLE4990_PHOTO
Table of ContentsPageOverview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41.1Summary of Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.2Target Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.3 Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5Pin Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Zero-field Output Voltage (Vzero) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Magnetic Sensitivity (S) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Temperature Gain Compensation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Clamping Option . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Transfer Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9Operating Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10Electrical and Magnetic Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Electrical Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Magnetic Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Signal Processing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136.1Magnetic Field Ranges (fixed in -E6782 version) . . . . . . . . . . . . . . . . . . . 13
Range register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
6.2Gain Setting (fixed in -E6782 version) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Gain Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
6.3Offset Setting (fixed in -E6782 version) . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Offset Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
6.4Clamping (not enabled in -E6782 version) . . . . . . . . . . . . . . . . . . . . . . . . 16
Error Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17Calibration and Fusing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18Data Transfer Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Programming of Sensors with Common Supply Lines . . . . . . . . . . . 18
Sensor Interface Tool . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Application Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19Package Outlines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
1Overview
1.1Summary of FeaturesVery linear and ratiometric rail-to-rail output signal with push-pull outputTemperature compensation Low drift of output signal over temperature and lifetimeProgrammable parameters stored in fuse memory:magnetic range and magnetic sensitivity (gain)zero field voltage (offset)clamping optiontemperature coefficient (calibrated and fused during production)memory lockWorking over temperatures from -40 °C up to 150 °CSingle supply voltage 4.5 - 5.5 VContinuous measurement ranges between -200 mT and +200 mT or 0 and 400 mTVery slim 4-pin package with only 1mm thicknessReverse polarity and overvoltage protection for all pinsOutput short circuit protectionOn-board diagnostics (wire breakage detection)Individual programming and operation of multiple sensors with common power supplyTwo point calibration of magnetic transfer function
1.2Target ApplicationsRobust replacement of potentiometersNo mechanical abrasionResistant to humidity, temperature, pollution, and vibrationLinear and angular position sensing in automotive applications like pedal position,
suspension control, valve or throttle position, headlight levelling, and steering angleHigh current sensing for battery management, motor control, and electronic fuse
1.3 Ordering InformationStandard typeCompletely calibrated and fusedTemperature coefficient 0 ppm/°C
Functional DescriptionPin Configuration
Figure 1 shows the location of the hall element in the chip.
Figure 1Pin Configuration and Hall Cell Location
Table 1Pin Definitions and Functions
General
The linear Hall IC TLE4990 has been designed specifically to meet the demands of
highly accurate rotation and position detection, as well as for current measurement
applications.
The sensor provides a ratiometric analog output voltage which is ideally suited for A/D
conversion with the supply voltage as a reference.
The IC is produced in BiCMOS technology with high voltage capability and also providing
reverse polarity protection.
Zero-field Output Voltage (Vzero)
The output voltage with no magnetic field present is called the zero field voltage Vzero.
It is programmable within the range of 3% to 19% of VDD (for Bipolar bit = 0) and 40% to
60% of VDD (for Bipolar bit = 1) by 10 ODAC bits with a resolution of 1.0 mV to 1.2 mV.
Magnetic Sensitivity (S)
The magnetic sensitivity is set in two steps: First the "coarse gain" is selected out of 8
values (3 PRE bits). Then the "fine gain" is adjusted by another 10 GDAC bits.
The resulting range of sensitivity extends from 15 mV/mT to 180 mV/mT at the nominal
supply voltage of 5 V. Note that as the sensitivity is ratiometric, it will also depend linearly
on the supply voltage.
The sensitivity of the -E6782 version is programmed during production.
It is calibrated to a value of 20 mV/mT at the nominal supply voltage of 5 V.
Temperature Gain Compensation
The temperature compensation of the sensitivity is programmed during production.
The value of +350 ppm/°C to provides an excellent accuracy for the use of a SmCo
permanent magnet. Stability is achieved by the dynamic offset cancellation technique to
eliminate any spurious mechanical or temperature effects.
The -E6785 version is calibrated to 0 ppm/°C. It can be used e.g. for current
measurement applications.
Clamping Option
It is possible to reduce the output voltage swing from its original 3% ... 97% VDD to a
limited swing of 10% ... 90% VDD by setting the clamping bit. This allows to detect a
broken wire. In this case the output voltage is tied to ≤ 6% or ≥ 94% of VDD.
The -E6782 version has this feature disabled.
Block Diagram
Figure 2 shows a simplified block diagram.
Figure 2Block Diagram
Principle of OperationA magnetic flux is measured by a Hall-Effect cell.The Temperature compensation modulates the bias current of the hall cell.The output signal from the Hall-Effect cell is amplified.A zero field voltage is added.The output voltage range can be clamped by limiters.The final output value is amplified and buffered.The output voltage is proportional to the supply voltage (ratiometric bahaviour).
An OBD (On Board Diagnistics) circuit connects the output to VDD or GND in case of
errors.
Transfer Functions
The examples in Figure 3 show how different magnetic field ranges can be mapped to
the output voltage. Polarity mode: Unipolar : only magnetic fields in one direction are measured.
The zero field voltage is near to the GND level.Bipolar: Magnetic fields can be measured in both orientations.
The zero field voltage is about the half voltage.
Figure 3 Examples of Operation
Absolute Maximum Ratings Note:Stresses above those listed under Absolute Maximum Ratings may cause
permanent damage to the device. This is a stress rating only and functional
operation of the device at these or any other conditions above those indicated in
the operational sections of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect device reliability.
During absolute maximum rating overload conditions (VIN>VDD or VINvoltage on VDD pins with respect to ground (VSS) must not exceed the values
defined by the absolute maximum ratings.
Table 2Absolute Maximum Rating Parameters 1)Only valid if the MEMlock bit is set and the TST pin is connected to GND.
Operating RangeThe following operating conditions must not be exceeded in order to ensure
correct operation of the TLE4990. All parameters specified in the following
sections refer to these operating conditions, unless otherwise noticed.
Table 3Operating Condition Parameters1)Keeping signal levels within the limits specified in this table, ensures operation without overload conditions.OBD= On Board Diagnostics (see Table 12).A minimum capacitance of 1 nF is recommended in order to improve the EMC behaviour.RTHja ≤ 150 K/W
Electrical and Magnetic Parameters Electrical Parameters
Table 4Electrical characteristicsValid for VOUT in the range from 10% to 90% VDD.Not for the -E6782 version.@ 25 °CFor Sensitivity S < 80 mV/mT, for higher sensitivities the zero field drift is dominant (see Table 5).Definition: Rat = (VOUT(VDD) / VDD) / (VOUT (VDD = 5 V) / 5 V) x 100%
for Vout in the range from 10% VDD to 90% VDD.The output voltage has reached 99% of its final value within tPon after power on.No external filtering, with a sensitivity of 30 mV/mT (digital switching noise included) @ 25 °C.
Magnetic Parameters
Table 5Magnetic Characteristics@ VDD = 5 VIn the lowest programmable sensitivity range a sensitivity less or equal to min(S) is guaranteed.
In the highest programmable sensitivity range a sensitivity of greater or equal to max(S) is guaranteed.
The ratio of max(S) / min(S) ≥ 15.@ 25 °CNot for the -E6782 version.B10% is the magnetic field, at which VOUT = 0.1 x VDD.
B90% is the magnetic field, at which VOUT = 0.9 x VDD.
VOUT,id = [0.1 + 0.8 x (B - B10%) / (B90% - B10%)] x VDD.
Lin = (VOUT / VOUT,id - 1) · 100% for all VOUT between 10% VDD and 90% VDD.The temperature coefficient of the magnetic sensitivity is the slope of a linear least-square fit through
the real curve.For lower sensitivities, the zero voltage drift is dominant (see Table 4).Equivalent to magnetic input noise at 25 °C. The equivalent magnetic input noise depends on the selected
sensitivity. At highest sensitivity it is typically 25 µTRMS, at lowest sensitivity it is typically 50 µTRMS at 25 °C.
