TJA1080ATSSLASH2SLASHT datasheet(23/49 Pages) NXP

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TJA1080A

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Product data sheet

Rev. 5 — 24 February 2011

23 of 49

NXP Semiconductors

TJA1080A

FlexRay transceiver

• Star configuration: If an undervoltage is present on pin VIO (even if the UVVIO flag is

reset) pins EN, STBN, TXD and BGE are set LOW (internally) and pin TXEN is set

HIGH (internally). If the UVVIO flag is set, pin INH1 is switched off. If an undervoltage

is present on pin VIO and VCC is within the operating range, the TJA1080A will forward

the received data on TRXD or bus lines to all other branches.

6.7 Flags

6.7.1 Local wake-up source flag

The local wake-up source flag can only be set in a low power mode. When a wake-up

event on pin WAKE is detected (see Section 6.5.4) it sets the local wake-up source flag.

The local wake-up source flag is reset by entering a low power mode.

6.7.2 Remote wake-up source flag

The remote wake-up source flag can only be set in a low power mode if pin VBAT is within

its operating range. When a remote wake-up event is detected on the bus lines (see

Section 6.5.3) it sets the remote wake-up source flag. The remote wake-up source flag is

reset by entering a low power mode.

6.7.3 Wake flag

The wake flag is set if one of the following events occurs:

• The local or remote wake-up source flag is set (edge sensitive)

• A positive edge is detected on pin STBN if VIO is present

• Recovery of the UVVBAT flag (only in node configuration)

• By recognizing activity on pins TRXD0 and TRXD1 (only in star configuration)

In node configuration the wake flag is reset by entering Normal mode, a low power mode

or setting one of the undervoltage flags. In star configuration the wake flag is reset by

entering a low power mode or by recovery of the UVVCC signal (without trec(uv)(VCC)).

6.7.4 Power-on flag

The PWON flag is set if the internal supply voltage for the digital part becomes higher than

the lowest value it needs to operate. In node configuration, entering Normal mode resets

the PWON flag. In star configuration the PWON flag is reset when the UVVCC signal goes

LOW (no undervoltage detected).

6.7.5 Node configuration flag

Configuration flag set means node configuration.

6.7.6 Temperature medium flag

The temperature medium flag is set if the junction temperature exceeds Tj(warn)(medium) in a

normal power mode while pin VBAT is within its operating range. The temperature medium

flag is reset when the junction temperature drops below Tj(warn)(medium) in a normal power

mode with pin VBAT within its operating range or after a read of the status register in a low

power mode while pin VBAT is within its operating range. No action will be taken if this flag

is set.

TJA1080ATS/2/T Datasheet(PDF) 23 Page - NXP Semiconductors

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