TJA1080ATSSLASH2SLASHT datasheet(18/49 Pages) NXP

18 / 49 page

TJA1080A

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Product data sheet

Rev. 5 — 24 February 2011

18 of 49

NXP Semiconductors

TJA1080A

FlexRay transceiver

6.3.2 Star-transmit mode

This mode is entered if one of the following events occur:

• If the transceiver is in Star-idle mode and activity is detected on pin TXEN.

• If the transceiver is in Star-idle mode and activity is detected on pins TRXD0 and

TRXD1.

In Star-transmit mode the transmitter is enabled and the transceiver can transmit data on

the bus lines and on the TRXD lines. It transmits the data received on pins TXD or TRXD0

and TRXD1, depending on where activity is detected:

• If activity is detected on the TRXD lines, the transceiver transmits data from pins

TRXD0 and TRXD1 to the bus.

• If activity is detected on the TXEN, the transceiver transmits data from pin TXD to the

bus and to the TRXD lines.

6.3.3 Star-receive mode

This mode is entered if the transceiver is in Star-idle mode and activity has been detected

on the bus lines.

In Star-receive mode the transceiver transmits data received on the bus via the TRXD0

and TRXD1 lines to other transceivers connected to the TRXD lines. The transmitter is

always disabled. RXD, which represents the data on the bus lines, is output at TRXD0 and

TRXD1.

6.3.4 Star-standby mode

This mode is entered if one of the following events occur:

• From Star-idle, Star-transmit or Star-receive modes if the wake flag is set and an

undervoltage on pin VCC is present for longer than tto(uv)(VCC).

• If the PWON flag is set.

In Star-standby mode the transceiver has entered a low power mode. In this mode the

current consumption is as low as possible to prevent discharging the capacitor at pin

VBUF.

If pins VIO and VBUF are within their operating range, pins RXD and RXEN will indicate the

wake flag.

TJA1080ATS/2/T Datasheet(PDF) 18 Page - NXP Semiconductors