The TCAN1463-Q1 has six operating modes: normal, standby, silent, go-to-sleep, sleep, and off mode. Operating mode selection is controlled using the nSTB pin and EN pin in conjunction with supply conditions, temperature conditions, and wake events.

1. The enable pin can be in a logical high or low state while in sleep mode but since it has an internal pull-down, the lowest possible power consumption occurs when the pin is left either floating or pulled low externally.
2. At power-up, the undervoltage timers for V_CC and V_IO are disabled, allowing for longer period for V_CC and V_IO supplies to power up (up to t_INACTIVE). V_CC or V_IO need to be above UV_CC(R) and UV_IO(R) respectively to enable their respective t_UV timers. The V_CC undervoltage timer starts when V_CC falls below UV_CC(F), while V_IO undervoltage timer starts when V_IO falls below UV_IO(F). When either of these timers exceed t_UV, the device enters sleep mode.
3. The Sleep Wake Error (SWE) timer starts as soon as the device enters Standby mode. The timer halts and resets as soon as the device enters Normal mode. If the device enters Silent mode from Standby mode, the SWE timer does not halt and the device needs to be transitioned to Normal mode before the SWE timer expires. If the device enters Silent mode from Normal mode, the SWE timer will not be active in Silent mode.
4. When the Sleep mode is entered from Go-To-Sleep Mode or from a UV_CC or UV_IO event, a low-to-high transition on nSTB is required to move the device into Normal or Silent mode. If EN is high during the rising edge on nSTB, the device moves to Normal mode. If EN is low during the rising edge on nSTB, the device moves to Silent mode. V_IO must be above UV_IO(R) in order to leave Sleep mode using the EN and nSTB signals.
5. When Sleep mode is entered due to an SWE timer timeout (>t_INACTIVE), there is an extra requirement to exit Sleep mode and transition into Normal or Silent mode directly using the EN and nSTB signals. To move to Normal mode, the nSTB pin must be high and a low-to-high transition must occur on EN. To move to Silent mode, the nSTB pin must be high and a high-to-low transition must occur on EN. If the device entered 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. V_IO must be above UV_IO(R) to leave Sleep mode by using the EN and nSTB signals.
6. The device recognizes the change in state of INH_MASK pin only in Silent mode to enable/disable INH functionality. Device latches the changed value of INH_MASK in Silent mode and retains this value through mode transitions. The latched value is lost only due to an UV_SUP event. The INH_MASK input is ignored in all other modes.