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BTS7040-2EPA Scheda tecnica(PDF) 39 Page - Infineon Technologies AG |
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BTS7040-2EPA Scheda tecnica(HTML) 39 Page - Infineon Technologies AG |
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39 / 58 page  Data Sheet 39 Rev. 1.00 2017-08-24 BTS7040-2EPA PROFETTM+2 Diagnosis 9 Diagnosis For diagnosis purpose, the BTS7040-2EPA provides a combination of digital and analog signals at pin IS. These signals are generically named SENSE and written IIS. In case of disabled diagnostic (DEN pin set to “low”), IS pin becomes high impedance. A sense resistor RSENSE must be connected between IS pin and module ground if the current sense diagnosis is used. RSENSE value has to be higher than 820 Ω (or 400 Ω when a central Reverse Battery protection is present on the battery feed) to limit the power losses in the sense circuitry. A typical value is RSENSE = 1.2 kΩ. Due to the internal connection between IS pin and VS supply voltage, it is not recommended to connect the IS pin to the sense current output of other devices, if they are supplied by a different battery feed. See Figure 32 for details as an overview. Figure 32 Diagnosis Block Diagram 9.1 Overview Table 18 gives a quick reference for the state of the IS pin during BTS7040-2EPA operation. Channel 1 Diagnosis_PROFET_2CH.emf IS pin control logic Internal Counters INn DSEL DEN Overtemperature IIS(FAULT) OUT0 VS MUX VDS(OLOFF) IIS(OLOFF) MUX IS RSENSE OUT1 MUX + Channel 0 T IL / kILIS |
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