There are three under voltage events monitored in the TCAN114x-Q1, VSUP, VIO and VCC. The three supply terminals are input sources for the TCAN114x-Q1 and have under voltage detection circuitry which places the device in a protected state if an under voltage fault occurs, UVSUP, UVCC and UVIO. This protects the bus during in under voltage event on these terminals. If VSUP is under voltage the device loses the source needed to keep the internal regulators active. This causes the device to go into a state where communication between the microprocessor and the TCAN114x-Q1 is disabled. The TCAN114x-Q1 is not able to receive information from the bus; and thus, does not pass any signals from the bus, including any Bus Wake via BWRR signals to the microprocessor. See Table 10-9. For under voltage events, there is a filter time, tUVFLTR, that the even must last longer than for the tUVSLP timer to start. Once the tUVSLP timer expires and the under voltage condition is still present, the device enters sleep mode or fail-safe mode if enabled.