ZHCSJK5C January 2018 – October 2020 TCAN4550-Q1
When VSUP drops to UVSUP level, the VCC CAN transceiver regulator loses the ability to maintain 5 V output. At this point, the UVCCOUT interrupt flag is set and the TCAN4550-Q1 turns off the regulator and place the CAN transceiver into a standby state. If VSUP returns to minimum levels the device enters standby mode. If VSUP continues to decrease to the power on reset level, the TCAN4550-Q1 shuts everything down. When VSUP returns to acceptable levels the device will come up the same as initial power on. All registers are cleared and the device has to be reconfigured.