TLE9252VLC datasheet(21/50 Pages) INFINEON

21 / 50 page

Data Sheet

Rev. 1.01

2018-01-09

TLE9252V

High-Speed CAN FD Transceiver

Modes of operation

5.8

Wake-Up functions

There are several possibilities for a mode change from Sleep Mode to another operation mode:

• Wake-Up Pattern (WUP)

• Local Wake-Up (LWU)

In typical applications the power supplies VCC and VIO are turned off in Sleep Mode. This means a mode change

can only be caused by an external event as WUP OR LWU. The detection of a valid WUP or LWU triggers a mode

change from Sleep Mode to Stand-by Mode.

5.8.1

Wake-up Pattern (WUP)

Within the maximum wake-up time tWAKE, the Wake-Up Pattern consists of a “dominant” signal with the pulse

width t > tFilter, followed by a “recessive” signal with the pulse width t > tFilter and another “dominant” signal

with the pulse width t > tFilter (see Figure 14).

Figure 14 Wake-Up Pattern (WUP)

The diagnostic output NERR and RxD will indicate a valid Wake-Up Pattern on the HS CAN bus.

A Wake-Up Pattern is not valid under the following conditions:

• A mode change to Normal-operating Mode OR Receive-only Mode is performed during the Wake-Up

Pattern.

• The maximum wake-up time tWAKE expires before a valid WUP has been detected.

• The transceiver is powered down (VBAT < VBAT_POD AND VCC < VCC_POD).

In Stand-by Mode the RxD output pin and the NERR diagnostic pin display the WUP detection (Details see

Chapter 7).

VDiff

RxD

t > tFilter

VIO

30% of VIO

VDiff_D_SLP

t < tWake

t > tFilter

tWU

VDiff_R_SLP

NERR

VIO

30% of VIO

wake-up

detected

Stand-by Mode

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