The TLE7268 is a dual transceiver for the Local Interconnect Network (LIN) with integrated wake-up and protection features. The TLE7268 is designed for in-vehicle networks using data transmission rates up to 20 kbps. The TLE7268 includes two independent transceivers that operate as bus drivers between the protocol controller and physical LIN networks.
The TLE7268 supports different modes of operation of the two transceivers for minimizing ECU current consumption in low power modes. When both transceivers are in Sleep mode, the TLE7268 typically draws a quiescent current of less than 10 μAᵢ, while they still can wake up on detecting LIN bus traffic on either bus channel. A common INH output can be used for controlling external circuitry, for example voltage regulators.
Based on the Infineon BiCMOS technology the TLE7268 provides excellent ESD robustness together with very high electromagnetic compliance (EMC). The TLE7268 reaches a very low level of electromagnetic emission (EME) within a broad frequency range and independent from the battery voltage. The TLE7268 is AEC qualified and tailored to withstand the harsh conditions of automotive environment.
The LIN interface is a single wire, bidirectional bus, used for in-vehicle networks. The TLE7268 Dual LIN transceiver is the interface between the microcontroller and physical LIN bus. The TLE7268 drives data from the microcontroller to the LIN bus via the TxD1/TxD2 inputs. The TLE7268 converts the transmit data streams on the TxD1/TxD2 inputs to LIN signals with optimized slew rates in order to minimize the level of electromagnetic emission on the LIN networks. The RxD1/RxD2 outputs read back the information from the LIN bus to the microcontroller. The integrated filter networks of the receivers suppress noise from the LIN bus and increase the electromagnetic immunity level of the transceivers.
The LIN specification defines two valid bus states:
dominant: LIN bus voltage level close to GND level recessive: LIN bus voltage level pulled up to the supply voltage Vₛ by bus termination
By setting the TxD1/TxD2 input of the TLE7268 to a “low” signal, the transceiver generates a dominant level on the corresponding BUS1/BUS2 pin. The RxD1/RxD2 outputs read the signal on the corresponding LIN bus pin and indicate the dominant LIN bus signal with a “low” signal to the microcontroller. Setting the TxD1/TxD2 pins to “high”, the TLE7268 sets the corresponding LIN interface pin BUS1/BUS2 to the recessive level. At the same time a “high” signal on the RxD1/RxD2 outputs indicates the recessive level on the LIN bus.
Every LIN network consists of a master node and one or more slave nodes. To configure a transceiver for master node applications, a termination resistor of 1 kΩ and a diode must be connected between LIN bus and power supply Vₛ.
Infineon TLE7268SKXUMA1