The TLIN1431x-Q1 implements a sleep wake error timer, t_{INACT_FS}. The purpose of the SWE timer is to keep the device and the node from being stuck in a high-power state. This timer is used to place the device into fail-safe or sleep mode due to fault conditions. In Pin mode, the SWE timer starts automatically when entering fail-safe and restart modes. A wake event causes the device to move from sleep mode to restart mode and if V_CC does not exceed UV_CC before the SWE timer times out the device re-enters sleep mode. This happens in either SPI or pin control modes.

In SPI mode, the SWE timer, when enabled, automatically starts when the device enters fail-safe, restart and standby modes. When the device leaves restart mode and enters standby mode, the processor must initiate a SPI transaction before the SWE timer times out or the device will enter fail-safe mode if enabled or sleep mode. This timer can be disabled at register 8'h1C[7] = 1. If the SWE timer duration is changed, this is accomplished register 8'h1C[6:3]. It can be changed from default of 5 min to between 30 sec to 10 min.