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TLE5009-E1010 Datasheet(PDF) 26 Page - Infineon Technologies AG |
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TLE5009-E1010 Datasheet(HTML) 26 Page - Infineon Technologies AG |
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26 / 32 page  TLE5009 Specification Data Sheet 26 Rev. 1.1, 2012-04 3.5 Safety Features 3.5.1 Built in error diagnosis The device sensor provides two functions at the VGMR pin. During normal operation the voltage measured at this pin is temperature dependent. The typical voltage at room temperature and the temperature coefficient are given in Table 4 “Electrical parameters” on Page 15. The second purpose of pin VGMR is the diagnosis functionality. In case the device detects an internal error, the pin is driven to a low level as described in Table 4 “Electrical parameters” on Page 15. The errors that can be detected by monitoring the status of the VGMR pin are: • Start-up failure • Overvoltage at VDD (threshold level min. 6V, max. 7V) • Undervoltage at internal nodes 3.5.2 External Diagnosis Adressing the demands for functional safety, run time checks can be done to increase the diagnostic coverage. Depending on the application specifics such as the available time and processing capabilities, the sensor behaviour is monitored and compared with the specified behaviour of the device. 3.5.2.1 Vector length check differential voltage mode A comprehensive safety check is to monitor the vector length of Vx and Vy signals. Output signals representing sine and cosine have a fixed 90° phase relationship to each other. To determine if the output signals are valid, the length of the output vector length must be nearly constant independent of the magnet position. The vector length corresponds to the amplitude of the output signals and utilizes the fact that there is a 90° phase shift between sine and cosine output. It is calculated according to Equation (26). As illustrated in Figure 14 “Valid vector length”, the vector describes a circle along one revolution of the magnet. The length of the vector is almost constant, slightly influenced by GMR synchronicity, orthogonality, offset and temperature. (26) Figure 14 Valid vector length 2 _ 2 _ DIFF Y DIFF X VEC V V V + = VX (COS) VY (SIN) VVEC VX VY |
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