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TLE9255WLC 데이터시트(PDF) 39 Page - Infineon Technologies AG |
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TLE9255WLC 데이터시트(HTML) 39 Page - Infineon Technologies AG |
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39 / 100 page ![]() Data Sheet 39 Rev. 1.02 2018-02-02 TLE9255W Fail Safe Functions 6.5 Overtemperature Protection Integrated overtemperature detection protects the TLE9255W from thermal overstress of the transmitter. The overtemperature protection is active in Normal-operating Mode only. The temperature sensor provides the temperature threshold TJSD. If the junction temperature exceeds the upper threshold TJSD, then the TLE9255W disables the transmitter and sets the bit TSD, indicating that a critical temperature situation is reached. After the device cools down the transmitter is re-enabled. Only an SPI command can reset the TSD bit. A hysteresis is implemented within the temperature sensor. Figure 35 Overtemperature protection 6.6 Delay Time for Mode Change The TLE9255W performs mode changes within the time window tMode_Change. During mode changes (tMode_Change) the RxD output pin is permanently set to “high” and does not reflect the status on the CANH and CANL input pins. After the mode change is completed, the TLE9255W releases the RxD output pin. TxD t t CANH CANL RxD t TJ t TJSD (shut down temperature) switch-on transmitter T cool down |
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