TJA1080A datasheet(6/50 Pages) NXP

Part #	TJA1080A

Description	FlexRay transceiver

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Manufacturer	NXP [NXP Semiconductors]

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TJA1080A_2

Preliminary data sheet

Rev. 02 — 26 August 2008

6 of 50

NXP Semiconductors

TJA1080A

FlexRay transceiver

6.

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.

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