TJA1080ATSSLASH2SLASHT datasheet(6/49 Pages) NXP

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TJA1080A

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Product data sheet

Rev. 5 — 24 February 2011

6 of 49

NXP Semiconductors

TJA1080A

FlexRay transceiver

Functional description

The block diagram of the total transceiver is illustrated in Figure 1.

6.1 Operating configurations

6.1.1 Node configuration

In node configuration the transceiver operates as a stand-alone transceiver.

The transceiver can be configured as node by connecting pins TRXD0 and TRXD1 to

ground during a power-on situation (PWON flag is set). The configuration will be latched

when the PWON flag is reset, see Section 6.7.4.

The following operating modes are available:

• Normal (normal power mode)

• Receive-only (normal power mode)

• Standby (low power mode)

• Go-to-sleep (low power mode)

• Sleep (low power mode)

6.1.2 Star configuration

In star configuration the transceiver operates as a branch of a FlexRay active star.

The transceiver can be configured as star by connecting pin TRXD0 or TRXD1 to VBUF

during a PWON situation (PWON flag is set). The configuration will be latched when the

PWON flag is reset, see Section 6.7.4 “Power-on flag”.

It is possible to redirect data from one branch to other branches via the inner bus. It is also

possible to send data to all branches via pin TXD, if pins TXEN and BGE have the correct

polarity.

The following operating modes are available:

• Star-idle (normal power mode)

• Star-transmit (normal power mode)

• Star-receive (normal power mode)

• Star-sleep (low power mode)

• Star-standby (low power mode)

• Star-locked (normal power mode)

In the star configuration all modes are autonomously controlled by the transceiver, except

in the case of a wake-up.

TJA1080ATS/2/T Datasheet(PDF) 6 Page - NXP Semiconductors