When configured as pin control, this pin becomes the transceiver enable control, EN. EN controls the operational modes of the device. When EN is high, the device can enter normal or fast operating modes allowing a transmission path from TXD to LIN and from LIN to RXD. When EN is low, the device can enter standby or sleep mode depending upon the state of the TXD pin. The device can enter normal mode only after wake up. EN has an internal pull-down resistor to ensure the device remains in low power mode even if EN floats. EN should be held low until V_SUP reaches the expected system voltage level.

When configured as SPI control, this pin becomes the processor interrupt pin. When the TLIN1431x-Q1 requires the attention of the processor, this pin is pulled low.