14, Functional Description. The TLE is an Integrated Hall-Effect Sensor designed specifically to meet the requirements of low-power devices. TLE Infineon Technologies Board Mount Hall Effect / Magnetic Sensors IC LP HALL Download the free Library Loader to convert this file for your ECAD Tool. . Application Notes. Innovative Features Integrated in Hall Switches · PDF. TLE,TLE DataSheet,TLE circuit,TLE manual,TLE data sheet, Low Power Hall Switch.
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Part #: TLE Part Category: Other Semiconductors Manufacturer: Infineon Technologies AG Description: Analog Circuit, 1 Func, PDSO3. Download PDF. Mar 19, Author: Saoirse Rosa Country: Mozambique Language: English (Spanish) Genre : Automotive Published (Last): 14 July Pages: PDF. Request Infineon Technologies TLE IC LP HALL SWTCH MCPWR SC online from Elcodis, view and download TLE pdf datasheet, Magnetic.
As stated above, the motion sensor system may be clocked to operate in a low current standby mode and a high current operating mode, wherein in the high current operating mode the digital signal is tracked and a difference is calculated. At an analog motion sensor output signal is provided to a digital measurement element configured to convert the analog signal to a digital signal. In various embodiments, the analog motion sensor signal may comprise a Hall sensor signal, an AMR sensor signal, etc.
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A difference in the digital signal is detected at In one embodiment, the difference may be detected by observing a continual change in the same direction e. In another embodiment, the difference can be detected as a difference in the value of the digital signal between a first and a second time. For example, since the slope of the digital signal is equal to a change in the digital signal value divided by a change in time, the slope of the digital signal denotes a difference in the digital signal between two points in time e.
The slope of the digital signal may be measured by storing a previous digital motion sensor signal in the digital storage element act and then by calculating a difference act between the current digital motion sensor signal value, provided directly from the digital signal tracking element , and the previous digital motion sensor signal value, provided by the digital storage element In one embodiment the digital motion sensor signal is stored in the storage element through the standby phase of operation.
At the detected difference is compared to a digital reference level.
In various embodiments the digital reference level may comprise a signal value e. If the difference is larger than the digital reference level e.
In particular, graph illustrates an output of a digital signal tracking element e. In particular, the output of the digital signal tracking element shown in graph is a digital signal which corresponds to the change in the motion sensor output signal e.
If the difference is greater than a digital reference level , the output of the difference detector shown in graph will be driven low, causing activation of the system from a sleep mode to a continuous operating mode illustrated as line For example, as shown in FIG.
However, the difference in the digital signal SDIG between a third time T3 and a later time between T3 and T4 is larger than the digital reference level and therefore the output of the difference detector is driven low, so that the activation signal generator outputs an activation signal that awakens the system at time T4.
However, the digital signal SDIG between a third time T3 and a later fourth time between T4 increases for a time that is larger than the digital reference level and therefore the output of the difference detector is driven low, so that the activation signal generator outputs an activation signal that awakens the system at time T4. In one embodiment, the magnetic motion sensor may comprise a Hall plate configured to detect physical motion by detecting changes in an applied magnetic field through use of the Hall effect, and to output an analog magnetic signal SMAG proportional to the detected physical motion.
In such an embodiment, the magnetic motion sensor e. In an alternative embodiment, the magnetic motion sensor may comprise an anisotropic magnetoresistance AMR sensor configured to detect physical motion by detecting changes in an applied magnetic field. The analog magnetic signal SMAG is provided to a digital difference detection circuit comprising an analog-to-digital converter ADC , an offset compensation element , a difference detector , and a digital storage component The ADC is configured to receive the analog magnetic signal SMAG and to generate a digital signal corresponding to the analog magnetic signal.
The digital signal is output to the offset compensation element , which is configured to remove offsets from the digital signal. In one embodiment, the offsets may comprise offsets introduced by a Hall plate. In particular, Hall plates typically may experience a zero point offset, wherein a non-zero output signal is generated in the absence of a magnetic field. In such an embodiment, the offset compensation element may be configured to reduce the zero point offset by operating a current spinning method, wherein for a Hall plate having symmetric contacts with respect to a rotation e.
By averaging the consecutive Hall voltages the offset may be reduced.
BACKGROUND OF THE INVENTION
In alternative embodiments, the offsets may further comprise offsets introduce by the ADC e. In another embodiment, the offsets may comprise offsets introduced by an AMR magnetic sensor.
The flipping technique may inject a high current to a coil adjacent to e. The magnetic field output from the coil flips the output signal of the AMR sensor to generate a chopping effect from the AMR sensor. Thus, by changing i. The offset compensated digital signal is output from the offset compensation element provided to a difference detector and to a digital storage element The digital storage element is configured to store offset compensated digital signal values over time.
The difference detector is configured to determine a difference between a current offset compensated digital signal value and a previous offset compensated digital signal value. In one embodiment, the detected difference may be compared to a digital reference level and a difference signal SDIF, comprising the difference of different offset compensated digital signals, may be generated based upon the comparison.
If a detected difference is larger than the digital reference level, the difference detector may be configured to output a difference signal SDIF to an activation signal generator that indicates that a system is to be activated e.
If the detected difference is smaller than the digital reference level, the difference detector may be configured to output a difference signal SDIFF to the activation signal generator that indicates that the system is to remain in a sleep mode. In one embodiment the activation signal generator may comprise a latch and a switch In one such embodiment, the latch may be configured to store a digital output signal SDIG e. For example, the latch may be configured to receive a difference signal SDIFF from the difference detector , wherein the difference signal SDIFF is low as long as the detected difference is smaller than the digital reference level and high if the detected difference becomes larger than the digital reference level.
Since the latch will remain at a low output so long as the difference signal SDIFF is high, the output of the latch will stay the same.
However, when the difference signal SDIFF is changed from a high value to a low value, it will cause the output of the latch to change states, turning on the switch and changing the operating mode of the system e.
In one embodiment, the switch may comprise a transistor device e. In one embodiment, the offset value determined by the offset compensation element may be digitally stored e.
For example, if an offset value is determined by the offset compensation element it may be used in a next operating phase to cancel the offset of the magnetic sensor. The reuse of a calculated offset value can provide offset compensation without having to perform offset compensation techniques, thereby reducing or removing the offset to provide for faster acquisition of the signal and resulting in a saving of time and energy in the activation process e.
In one embodiment, the comparator may comprise a sense resistor configured to receive a differential input voltage.
The current steering DAC , having one or more current sources, may be configured to generate a input voltage differential across the sense resistor of the comparator so that a buffered differential input voltage provided by the Hall plate can be compensated by a current provided by the current steering DAC e.
Therefore, the input voltage is copied to the sense resistor of the comparator and at the same time the current steering DAC overlays the input signal with the opposite signal so that the signal at the end of the tracking algorithm is compensated. In one embodiment, wherein the ADC is configured to perform a step-by-step tracking e. In one embodiment, one or more switches disposed upstream of the ADC may be configured to selectively couple axes of the Hall plate to the ADC to implement a current spinning method.
For example, the Hall plate shown in FIG. Furthermore, ADC e.
Demodulation is then performed by subtracting the first chopping signal from the second chopping signal, thereby cancelling out the offset of the Hall voltage. In other words, the one or more switches may act as a first chopper amplifier of a chopper demodulation circuit by switching the outputs of the Hall plate at a chopping frequency that effectively alternatively adds an offset value e.
Such chopping generates a modulated chopping signal at a chopping frequency, due to the swapping. The ADC may act as a filter, configured to remove the AC offset components and to demodulate the modulated chopping signal, back to the baseband.
Since the switches are configured to perform both chopping offset difference building in the time domains, the offset of the motion sensor e. This eliminates the effect of unstable offsets e. In particular, graph illustrates the signal output from the Hall plate and an offset , while graph illustrates the digital difference generated by the ADC e. Although FIG.
During a first clock phase , contacts C1 and C3 are coupled to a first current source a, while the one or more switches may be configured to couple contacts C2 and C4 to the ADC to generate a Hall voltage having a first polarity e. A positive Hall voltage a having a positive offset value a is delivered from the Hall plate to the ADC The resultant sum of the positive Hall voltage a and the positive offset a is tracked as a digital signal , which has a larger absolute magnitude than the positive Hall voltage a since the offset is positive, and the same sign as the Hall voltage.
During a second clock phase , contacts C2 and C4 are coupled to a second current source b, while the one or more switches may be configured to coupled contacts C3 and C1 to the ADC to generate a Hall voltage having a second polarity e.
A negative Hall voltage b having a positive offset value b is delivered from the Hall plate to the comparator The resultant sum of the negative Hall voltage b and the positive offset b is tracked as a digital signal , which has a smaller absolute magnitude than the negative Hall voltage b since the offset remains positive, and is the opposite sign as the Hall voltage.
Graph illustrates the difference , which is built e. Because the offsets remain the same sign in the first and second clock phases, and , the offset signals cancel out e.
Graph similarly illustrates the cancellation of offset values through difference building of the chopped signals, during a third clock phase The inventor has appreciated that difference building, as provided herein, is meant to encompass alternative processes which perform the same general process of offset cancellation, but which vary the process e.
For example, in one alternative embodiment, instead of difference building through the switches generating a positive difference e.
It will be appreciated that in some embodiments, the circuit may operate without the switches performing chopping or spinning. For example, if the activation circuit is configured to operate with a short standby time e.
In particular, FIG. The use of the two phases results in a relatively low average operating current of the system, thereby reducing the power consumption of the system e. In particular, during the operating phases a difference detection element detects the slope of the digital signal and compares the change in value of the digital signal to a digital reference level If the change in the value of the digital signal is smaller than the digital reference level e.
However, if change in the value of the digital signal exceeds the digital reference level then a change in the magnetic field is detected and the system is awakened at the end of the operating phase e. During the stand-by phase the comparison is stopped and digital signal values are stored so that current consumption of the system is reduced to low current consumption e.
In one particular example, the standby time is relatively long compared to the operating time.
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View shipping rates and policies ASIN: During the operate phase the IC compares the actual magnetic field detected with the internally tle switching tle As a 16bit device it also offers a The product does tle contain any tle the restricted substances in concentrations and applications banned by the Directive, and tle components, the product is capable of being worked on at the higher temperatures required by lead—free soldering The restricted substances and maximum allowed concentrations in tke tlr material are, by weight: The Manufacturers disclaim all hle including implied warranties of merchantability or fitness for a particular purpose and are not liable for any damages arising from your use tle or your tls to use the Information downloaded tle this tle An tle clock scheme is used to reduce the average operating current of the IC.
During the operate phase the IC compares the actual magnetic field detected with the internally compensated switching points. You have chosen to save the following item to a parts list:.
The product does not contain any of the restricted substances in concentrations tle applications banned by the Directive, and for components, the product is capable of being worked tle lte the higher temperatures required by lead—free soldering.At , a digital signal is generated that is proportional to a magnetic signal provided from a magnetic motion sensor.
Therefore, the term difference encompasses both a change from a first lower value to a second higher value a positive change and a change from a first higher value to a second lower value a negative change.
Alexa Actionable Analytics for the Web. In other words, the activation circuit may awaken the system if difference detection is recognized, but if adaptive ADC tracking did not reach a final value the length of the operating phase b may be increased until ADC recognizes a final value. A positive Hall voltage a having a positive offset value a is delivered from the Hall plate to the ADC The ADC may act as a filter, configured to remove the AC offset components and to demodulate the modulated chopping signal, back to the baseband.