The TCAN114x-Q1 has several operating modes: normal, standby, listen, sleep and fail-safe modes and two protected modes. The first four mode selections are made by the SPI register, 8h10[2:0]. Fail-safe mode if enabled is entered due to various fault conditions. The protected modes are a modified standby modes used to protect the device or bus when fail-safe mode is disabled. The TCAN114x-Q1 automatically goes from sleep to standby mode when receiving a WUP or LWU event. When selective wake is enabled, TCAN1145-Q1 and TCAN1146-Q1, the device looks for a wake up frame (WUF) after receiving a WUP. If a WUF is not received the device transitions back to sleep mode. See Table 10-1 for the various modes and what parts of the device are active during each mode.
|Block||Normal||Standby||Listen||Sleep||Fail-safe||UVIO Protected||TSD Protected (Fail-safe Disabled)|
|nINT (If Enabled)||On||On||On||Off||Fault Determines||Off||On|
|LIMP (If Enabled): |
|Off unless WD fail||Off||Off||Off||On if Enabled||Off||Off|
|SPI||On||On||On||On if VIO present||Fault Determines||Off||On|
|Low Power CAN RX||Off||On||Off||On||On||On||On|
Fail-safe mode has several blocks that state Fault Determines. The following provides an explanation.
For the state diagrams by default SPI is off in sleep mode. If VIO is present SPI will work in sleep mode but at a reduced data rate, which would include selective wake sub state as shown in Figure 10-11.