The EN pin controls the mode of the channel. If the EN1/EN2/EN3/EN4 pin is high at power up, the channel powers up in normal mode. In normal operational mode, the receiver and transmitter are active and the LIN transmission up to the LIN specified maximum of 20 kbps is supported. The receiver detects the data stream on the LIN bus and outputs it on RXD for the LIN controller. A recessive signal on the LIN bus is a digital high and a dominant signal on the LIN bus is a digital low. The driver transmits input data from TXD to the LIN bus. Normal mode is entered as EN transitions high while the LIN channel is in sleep or standby mode for > t_{MODE_CHANGE} plus t_NOMINT.