Infineon TLE8457

TLE8457

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 TLE8457 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 TLE8457 requires a logical “high” signal for the time t to,rec

on the

TxD input before releasing the data communication; The transmitter remains deactivated as long as the signal on the TxD input pin remains logical “low”, preventing possible bus communication disturbance (see

Figure 4

).

From Normal Operation Mode the TLE8457 can be set to Standby Mode or Sleep Mode.

EN

t

MODE,HIGH

t

MODE,LOW t

V

CC t

NRST t

RxD

Data transmission

t

to,rec t

TxD Data transmission

Standby mode Normal Operation mode t

Sleep mode

TLE8457_NORMAL_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 wakeup by a message on the LIN bus.

For changing the operation mode change from Standby Mode to Sleep Mode, the device has first to be set in

Normal Operation Mode, then in Sleep Mode (see

Figure 4

).

Data Sheet 8 Rev. 1.0

2016-08-05