TLE9255WLC datasheet(45/100 Pages) INFINEON

45 / 100 page

Data Sheet

Rev. 1.02 2018-02-02

TLE9255W

CAN Partial Networking

7.6

Selective wake SPI flags

7.6.1

SysErr Flag

The SysErr flag in the register SWK_STAT indicates an error condition in the selective wake unit of the

TLE9255W. Only if the SPI bit SWK_EN = 1, then the SysErr flag is set . The SysErr flag does not prevent entering

the Sleep Mode by an SPI command. However, the SysErr flag determines, whether the TLE9255W enters the

Selective Wake Sub-Mode (SysErr = 0) or Sleep WUP Mode (SysErr = 1). Figure 41 shows this scenario.

Figure 41

Impact of SysErr flag if a mode change SPI command to Sleep Mode has been sent

The SysErr flag is set under any of the following conditions:

• Selective wake configuration error is detected (see Chapter 7.4).

• The frame error counter value is greater than 31.

Only if no configuration error (CFG_VAL = 1) exists AND if the error counter is less than 32, then the TLE9255W

resets the SysErr flag.

7.6.2

SYNC Flag

The SYNC flag in the register SWK_STAT indicates that a classical CAN frame is detected correctly by the

selective wake unit. The SYNC flag works, if all of the following conditions are fulfilled:

• Selective Wake is enabled (SWK_EN Bit = 1)

• After Power on Reset the configuration is confirmed (CFG_VAL Bit = 1) at least once.

Change into the Sleep

Mode by a SPI command

Tranceiver perfom the

following actions:

- CFG_VAL will be cleared

- Switch to the Stand by

Mode

- Inhibit will be switch on if

configured.

Check

SYSERR

Enter Sleep WUP

Sub-Mode

Enter Selective Wake

Sub-Mode

WUF detected

WUF Flag will be set

WUP detected

WUP Flag will be set

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