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User’s Manual

1

Rev. 1.0

www.infineon.com/sensors

 2019-04-29

TLE5501

TMR-Based Angle Sensor

User’s Manual

About this document

Scope and purpose

This document covers the TMR angle sensor TLE5501 with its versions E0001 and E0002. 

Intended audience

This document is aimed at experienced hardware and software engineers using the TLE5501 angle
sensor 

Содержание TLE5501 E0001

Страница 1: ...Based Angle Sensor User s Manual About this document Scope and purpose This document covers the TMR angle sensor TLE5501 with its versions E0001 and E0002 Intended audience This document is aimed at experienced hardware and software engineers using the TLE5501 angle sensor ...

Страница 2: ...nt behavior 5 2 1 Bandwidth of the TMR bridge 5 2 2 Recommendation for the external capacitor Cb 9 3 Connection to a micro controller 10 3 1 Sigma Delta ADC 10 3 2 SAR ADC 10 3 2 1 Load step 11 3 2 2 Load step reduction 13 3 2 3 Oversampling 14 4 Calibration 15 5 Revision History 18 Table of Contents ...

Страница 3: ...est diagnostic coverage the four output signals have to be sampled singled ended This is necessary as the proposed external safety mechanisms in the Safety Manual act on the single ended signals Nevertheless to reach highest angle accuracy the differential calculated angle shall be used for the application The single ended signals are for diagnostic only Figure 1 Application circuit for TLE5501 E0...

Страница 4: ...ential signal used It is recommended to use a 100nF capacitor on the VDD pin to filter noise on the supply line As the device is ratiometric any noise on the supply is coupled to the sensor output SIN_P VDD_P COS_P GND_P COS_N SIN_N GND_N TLE5501 VDD_N Cb Cb 100n SIN_P VDD_P COS_P GND_P SIN_P VDD_P COS_P GND_P COS_N SIN_N GND_N TLE5501 VDD_N Cb Cb 100n 100n Cb Cb GND_N SIN_N VDD_N COS_N SIN_P VDD_...

Страница 5: ...R is specified in the datasheet and has a value between 4kΩ and 8kΩ Figure 5 Schematic of one branch of the TMR bridge with external buffer capacitor Cb The result of a pSPICE simulation of this output structure is shown in Figure 6 A resistor of RTMR 8kΩ and a capacitor value of Cb 1nF is assumed Applying a voltage step of 5V on the supply VDD is simulated This is compared with analytical simulat...

Страница 6: ...sient behavior when applying an AC magnetic field with frequency f is shown in Figure 7 and Figure 8 The pSPICE simulation is compared with analytical calculations according to Equation 2 2 and Equation 2 3 below Again a good fit is achieved using R 4kΩ for the calculation 2 2 2 3 0 00 0 50 1 00 1 50 2 00 2 50 3 00 0 0E 00 5 0E 06 1 0E 05 1 5E 05 2 0E 05 2 5E 05 3 0E 05 3 5E 05 U_out V time s pSPI...

Страница 7: ...t between output signal and excitation for an AC magnetic field Bridge resistor RTMR 8kΩ Cb 1nF For the analytical calculation the values R 4kΩ and Cb 1nF are used Equation 2 3 The transient behavior of the TMR output can be approximated with a simple RC model using R RTMR 2 0 00 0 10 0 20 0 30 0 40 0 50 0 60 0 70 0 80 0 90 1 00 100 1000 10000 100000 U t U0 frequency Hz Ampl pSPICE Ampl analyt 90 ...

Страница 8: ...TLE5501 should always be well below the calculated cut off frequency fc with the total capacitive load considered buffer capacitor Cb ADC input capacity parasitics and assuming a worst case bridge resistivity RTMR according to the datasheet Depending on the accuracy requirements of the application it might be necessary to further reduce the input magnetic frequency to minimize the phase shift betw...

Страница 9: ...ridge output shall be small It can be estimated using Equation 2 3 The external buffer capacitor Cb can be calculated depending on magnetic input frequency fin and desired phase shift Φ according to Equation 2 8 2 8 For an application with 8000rpm fin 133Hz R 4kOhm R RTMR 2 see Chapter 2 1 and Φ 0 2 the maximum buffer capacitor Cb is calculated to Cb 1nF The time constant τbr of the bridge in this...

Страница 10: ... to sample the single ended signals SIN_P SIN_N COS_P COS_N This makes single ended ADC channels necessary The four channels should be sampled synchronous or with a very low time difference If the microcontroller in use allows to implement the above described requirements a Sigma Delta ADC is a good choice for the connection to the TLE5501 3 2 SAR ADC The SAR successive approximation register is a...

Страница 11: ... RTMR is given by τbr RTMR 2 x Cb 4µs see also Chapter 2 2 For charging CSH the time constant τSH RSH x CSH 14ns Therefore the charging of CSH and also the de charging of Cb is much faster 9x14ns 140ns than the recovery of the voltage at Cb 9x4µs 36µs Due to this with the assumption that τbr τSH the voltage at Cb drops by a value of ΔU which can be approximated as follows Equation 3 1 3 1 With abo...

Страница 12: ...timated to fsample 27 7kHz Equation 3 2 In reality the achievable sampling frequency is lower as also some additional time has to be included for the holdtime of theADC Samplingtimeandholdtime aredependingon thesettingsofthemicrocontroller inuse 3 2 The relation between buffer capacitor Cb sampling frequency fsample and sensor bandwidth frotation is shown in Figure 12 In this calculation sensor ba...

Страница 13: ... capacitor Cb has to be larger than 57 3nF In this case the voltage drop during ADC sampling is less than 0 5 LSB and therefore not visible On the other side such a large buffer capacitor limits the bandwidth of the sensor and the time constant of the bridge calculates to τbr 229 3µs For the phase shift to be less than 0 2 the maximum frequency of the applied magnetic field f rotation has to be be...

Страница 14: ...ver in the following hold time Figure 13 ADC voltage for a sampling time of 1µs and a conversion time of 1µs As a consequence the measured sine and cosine output voltage has an error which can contribute to an additional angle error As long as it is a constant and stable condition this amplitude error is compensated when doing the sensor calibration matching of sine and cosine amplitude Furthermor...

Страница 15: ...the magnet in use has to be considered For the usual magnet material the magnetic field strength is reduced with increasing temperature and increased with decreasing temperature Therefore depending on the maximum and minimum temperatures in the application the magnetic field at 25 C and 0h has to be adjusted accordingly in order not to violate the specified limits Given a specified range of 25mT t...

Страница 16: ...K 10 field strength variation from initial calibration condition 25 C 50mT over lifetime Figure 16 shows the typical angle error for a sensor which has its initial calibration of offset amplitude and orthogonality error at 25 C 50mT Due to aging effects of the magnet it is assumed that the magnetic field at 25 C is reduced by 10 to 45mT The sensor is still operated with calibration parameters comi...

Страница 17: ...ering10 magnetic fieldchangeduetoagingand airgapvariation i e 45mT 25 C Magnetic field values change with a TC of 2000ppm K ferrite magnet material Magnetic field values are indicated at each measurement temperature 0 1 0 15 0 2 0 25 0 3 0 35 50 25 0 25 50 75 100 125 150 175 angle error temperature C 50mT Initial calibration 50 8mT 49 1mT 47 2mT 45 0mT 42 8mT 39 6mT 36 0mT 33 8mT ...

Страница 18: ...User s Manual 18 Rev 1 0 2019 04 29 TLE5501 TMR Based Angle Sensor Revision History 5 Revision History Revision Date Changes 0 1 2019 04 29 Initial version ...

Страница 19: ...infringement of intellectual property rights of any third party with respect to any and all information given in this application note The data contained in this document is exclusively intended for technically trained staff It is the responsibility of customer s technical departments to evaluate the suitability of the product for the intended application and the completeness of the product inform...

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