TJA1080ATSSLASH2SLASHT datasheet(19/49 Pages) NXP

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TJA1080A

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Product data sheet

Rev. 5 — 24 February 2011

19 of 49

NXP Semiconductors

TJA1080A

FlexRay transceiver

6.3.5 Star-sleep mode

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

• From any mode if an undervoltage on pin VCC is present for longer than tdet(uv)(VCC).

• If the transceiver is in Star-idle mode and no activity is detected on the bus lines and

pins TXEN, TRXD0 and TRXD1 for longer than tto(idle-sleep).

• If Star-locked mode is active for longer than tto(locked-sleep).

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

current consumption is as low as possible to prevent the car battery from discharging. The

inhibit switches are switched off.

In this mode the wake flag wakes the transceiver. A detailed description of the wake-up

mechanism is given in Section 6.5.

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

wake flag.

6.3.6 Star-locked mode

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

• If the transceiver is in Star-transmit mode and activity on pin TXEN is detected for

longer than tto(tx-locked).

• If the transceiver is in Star-receive mode and activity is detected on the bus lines for

longer than tto(rx-locked).

This mode is a fail-silent mode and in this mode the transmitter is disabled.

6.4 Start-up

The TJA1080A initialization is independent of the way the voltage supplies VBAT, VCC and

VIO ramp up. A dedicated power-up sequence is not necessary.

6.4.1 Node configuration

Node configuration can be selected by applying a voltage lower than 0.3VBUF to pins

TRXD0 and TRXD1 during power-on. Node configuration is latched by resetting the

PWON flag while the voltage on pins TRXD0 and TRXD1 is lower than 0.3VBUF; see

Section 6.7.4 for (re)setting the PWON flag.

6.4.2 Star configuration

Star configuration can be selected by applying a voltage higher than 0.7VBUF to pins

TRXD0 or TRXD1 during power-on. Star configuration is latched by resetting the PWON

flag while one of the voltages on pins TRXD0 or TRXD1 is higher than 0.7VBUF. See

Section 6.7.4 for (re)setting the PWON flag. In this case the transceiver goes from

Star-standby mode to Star-idle mode.

TJA1080ATS/2/T Datasheet(PDF) 19 Page - NXP Semiconductors

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