Data Sheet

15

Rev. 1.1

2018-10-15

TLE8457C / TLE8457D

LIN Transceiver with integrated voltage regulator

Functional description

4.4

LIN transceiver

The LIN interface is a single wire, bi-directional bus, used for in-vehicle networks. The integrated LIN

transceiver of the TLE8457C / TLE8457D is the interface between the microcontroller and the physical LIN bus

(see Figure 16). Data from the microcontroller is driven to the LIN bus via the TxD input. The transmit data

stream on the TxD input is converted to a LIN bus signal with optimized slew rates in order to minimize the

electromagnetic emission of the LIN network. The RxD output reads back the information from the LIN bus to

the microcontroller. The receiver has an integrated filter network for noise suppression from the LIN bus and

to increase the electromagnetic immunity level of the transceiver.

The LIN specification defines two valid bus levels (see Figure 12):

• Dominant state with the LIN bus voltage level near GND, actively driven by a transceiver.

By setting the TxD input of the TLE8457C / TLE8457D to a logic “low” signal, the transceiver generates a

dominant level on the BUS interface pin. The receiver reads back the signal on the LIN bus and indicates the

dominant LIN bus signal with a logic “low” on the RxD output to the microcontroller. By setting the TxD input

“high”, the transceiver sets the LIN interface pin to the recessive level. At the same time the recessive level on

the LIN bus is indicated by a logic “high” signal on the RxD output.

Every LIN network consists of a master node and one or more slave nodes. To configure the TLE8457C /

TLE8457D for master node applications, a termination resistor of 1 kΩ and a diode must be connected

Figure 12

LIN bus signals

TLE8457_LIN_COMMUNICATION_A

t

TxD

BUS

Recessive

Dominant

Recessive

t

t

RxD