The TCAN4550-Q1 has a temperature monitor located by two components that can cause thermal issues; V_CCOUT LDO and CAN transceiver. This is a device protection mechanism. When TSD temperature is reached, the device enters the TSD protected state as shown in Figure 3-6. In this state, the V_CCOUT LDO is turned off and the CAN transceiver is disabled. This helps mitigate bus communication fault, shown as 2, and V_CCOUT issues, shown as 9, in Figure 3-5 and is considered safety mechanism SM-05. Undervoltage lock out prevents operation of the device and communication with the MCU and the CAN FD Bus when there is insufficient power on V_SUP, V_IO or V_CCOUT.