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TLE9185QXV33 Datasheet(PDF) 92 Page - Infineon Technologies AG |
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TLE9185QXV33 Datasheet(HTML) 92 Page - Infineon Technologies AG |
92 / 192 page ![]() TLE9185QXV33 BLDC Driver Supervision Functions Datasheet 92 Rev.1.0 2021-01-21 10.2 Watchdog Function The watchdog is used to monitor the communication with the microcontroller and to trigger a reset or move the device to Fail Safe Mode, if the microcontroller stops serving the watchdog. Two different types of watchdog functions are implemented and can be selected via the bit WD_CFG: • Time-Out Watchdog (default value) •Window Watchdog The respective watchdog functions can be selected and programmed in Normal Mode. The configuration stays unchanged in Stop Mode. Please refer to Table 27 to match the device modes with the respective watchdog modes. The watchdog timing is programmed via SPI command in the register WD_CTRL. As soon as the watchdog is programmed, the timer starts with the new setting and the watchdog must be served. The watchdog is triggered by sending a valid SPI-write command to the watchdog configuration register. The watchdog trigger command is executed when the SPI command is interpreted. When coming from Init Mode, Restart Mode or in certain cases from Stop Mode, the watchdog timer is always started with a long open window. The long open window (tLW) allows the microcontroller to run its initialization sequences and then to trigger the watchdog via SPI. The watchdog timer period can be selected via SPI (WD_TIMER).The timer setting is valid for both watchdog types. The following watchdog timer periods are available: • WD Setting 1: 10 ms • WD Setting 2: 20 ms • WD Setting 3: 50 ms • WD Setting 4: 100 ms • WD Setting 5: 200 ms • WD Setting 6: 500 ms • WD Setting 7: 1 s • WD Setting 8: 10 s In case of a reset, Restart Mode or Fail-Safe Mode is entered according to the configuration and the SPI bits WD_FAIL are set. Once the RSTN goes high again the watchdog immediately starts with a long open window the device enters automatically Normal Mode. The Watchdog behaviour in Software Development Mode is described in Chapter 5.4.7. Table 27 Watchdog Functionality by modes Mode Watchdog Mode Remarks Init Mode Starts with Long Open Window Watchdog starts with Long Open Window after RSTN is released. Normal Mode WD Programmable Window Watchdog, Time-Out watchdog or switched off for Stop Mode. Stop Mode Watchdog is fixed or off Sleep Mode Off Device will start with Long Open Window when entering Normal Mode. Restart Mode Off Device will start with Long Open Window when entering Normal Mode. |
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