Sleep mode is the lowest power mode of the TCAN1463-Q1. In sleep mode, the CAN transmitter and the main receiver are switched off and the transceiver cannot send or receive data. The low power receiver is able to monitor the bus for any activity that validates the wake-up pattern (WUP) requirements, and the WAKE monitoring circuit monitors for state changes on the WAKE terminal for a local wake-up (LWU) event. ISUP current is reduced to its minimum level when the CAN transceiver is in CAN autonomous inactive state. The INH pin is switched off in sleep mode causing any system power supplies controlled by INH to be switched off thus reducing system power consumption.
Sleep mode is exited:
- If a valid wake-up pattern (WUP) is received via the CAN bus pins
- On a local WAKE (LWU) event
- On a low-to-high transition of the nSTB pin
When the Sleep mode is entered due to an SWE timer timeout (>tINACTIVE), there is an extra requirement to enter Normal or Silent mode directly (without entering Standby mode via LWU or WUP) using the EN and nSTB signals. In order to move to the Normal mode, the nSTB pin must be high and a low-to-high transition must occur on EN. In order to move to the Silent mode, the nSTB pin must be high and a high-to-low transition must occur on EN. If the device entered the Sleep mode while the nSTB was already high, there must be a transition on the EN pin while nSTB is low prior to the sequence described above. See Figure 9-7 for more information. VIO must be above UVIO(R) in order to leave the Sleep mode using the EN and nSTB signals.