Data Sheet

8

Rev. 1.1

2018-10-15

TLE8457C / TLE8457D

LIN Transceiver with integrated voltage regulator

Functional description

4.1.1

Normal operation mode

In normal operation mode both the voltage regulator and the LIN transceiver are active. The TLE8457C /

TLE8457D supports data transmission rates up to 20 kBit/s. Data from the microcontroller is transmitted to

the LIN bus via the TxD input, while the receiver detects the data stream on the LIN bus and forwards it to the

RxD output.

After entering normal operation mode the TLE8457C / TLE8457D requires a logic “high” signal for the time

as the signal on the TxD input pin remains logic “low”, preventing possible bus communication disturbance

(see Figure 4).

From normal operation mode the TLE8457C / TLE8457D can be set to standby mode or sleep mode.

Figure 4

Entering normal operation mode, transition to sleep mode

4.1.2

Standby mode

Standby mode is a low power mode with ultra low quiescent current consumption while the voltage regulator

remains active, supplying for example a microcontroller in stop mode. No LIN bus communication is possible,

the transmitter and the receiver are disabled. The low power receiver is still active and the device can wake up

by a message from the LIN bus.

For changing the operation mode from standby mode to sleep mode, the device has to be set to normal

operation mode first, then to sleep mode (see Figure 4).

TLE8457_NORMAL_MODE

Standby mode

Normal Operation mode

Sleep mode

NRST

t

Data transmission

RxD

Data transmission

TxD

t

t

EN

t

t