Sleep Mode is the power saving mode for the TLIN1431x-Q1. Even with extremely low current consumption in this mode, the device can still wake up from the LIN bus through a wake up signal or local wake via WAKE pin. Upon a wake event the SWE timer, t_{INACT_FS}, starts and the device enters restart mode. If UV_CC is still present after this time, the device re-enters sleep mode. The LIN bus is filtered to prevent false wake up events. The wake-up events must be active for the respective time periods (t_LINBUS).

In pin control mode, sleep mode is entered by setting EN low for longer than t_EN and TXD pin is low when entered from normal mode.

In SPI control mode, setting register 8'h1D[7:6] = 01b transitions the device into sleep mode. If the reset counter exceeds three, the device enters sleep mode from restart mode. The reset counter increments on an UV_CC event, or a watchdog error event that causes the device to enter restart mode when fail-safe mode is disabled. The reset counter must be cleared through a SPI command.

While the device is in sleep mode, the following conditions exist.

• The LIN bus driver is disabled and the internal LIN bus termination is switched off (to minimize power loss if LIN is short circuited to ground). However, the weak current pull-up is active to prevent false wake up events in case an external connection to the LIN bus is lost.
• The normal receiver is disabled.
• LIN wake up receiver is active.
• WAKE pin is active.