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TLE9185QXV33 Datasheet(PDF) 94 Page - Infineon Technologies AG |
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TLE9185QXV33 Datasheet(HTML) 94 Page - Infineon Technologies AG |
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94 / 192 page  TLE9185QXV33 BLDC Driver Supervision Functions Datasheet 94 Rev.1.0 2021-01-21 10.2.2 Window Watchdog Compared to the time-out watchdog the characteristic of the window watchdog is that the watchdog timer period is divided between a closed and an open window. The watchdog must be triggered within the open window. A correct watchdog trigger results in starting the window watchdog period by a closed window followed by an open window. The watchdog timer period is at the same time the typical trigger time and defines the middle of the open window. Taking the oscillator tolerances into account leads to a safe trigger area of: tWD × 0.72 < safe trigger area < tWD × 1.20. The typical closed window is defined to a width of 60% of the selected window watchdog timer period. Taking the tolerances of the internal oscillator into account leads to the timings as defined in Figure 48. A correct watchdog service immediately results in starting the next closed window. If the trigger signal meet the closed window or if the watchdog timer period elapses, then a watchdog reset is triggered (RSTN low) and the device switches to Restart Mode or Fail-Safe Mode. Figure 48 Window Watchdog Definitions 10.2.3 Watchdog Setting Check Sum A check sum bit is part of the SPI command to trigger the watchdog and to set the watchdog setting. The sum of the 16 data bits in the register WD_CTRL needs to have even parity (see Equation (10.1)). This is realized by either setting the bit CHECKSUM to 0 or 1. If the check sum is wrong, then the SPI command is ignored, i.e. the watchdog is not triggered or the settings are not changed and the bit SPI_FAIL is set. The written value of the reserved bits of the WD_CTRL register is considered (even if read as ‘0’ in the SPI output) for checksum calculation, i.e. if a 1 is written on the reserved bit position, then a 1 will be used in the checksum calculation. (10.1) closed window open window t / [tWD_TIMER] safe trigger area tWD x 0.72 tWD x 1.20 uncertainty uncertainty tWD x 0.48 tWD x 1.80 Watchdog Timer Period (WD_TIMER) Typ. closed window Typ. open window tWD x 0.6 tWD x 1.0 tWD x 0.9 Bit CHECKSUM () Bit22 … Bit8 ⊕⊕ = |
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