TJA1029

All information provided in this document is subject to legal disclaimers.

© NXP B.V. 2013. All rights reserved.

Product data sheet

Rev. 1 — 8 January 2013

7 of 24

NXP Semiconductors

TJA1029

LIN 2.2A/SAE J2602 transceiver with TXD dominant timeout

7.2.1 Reset mode

When the TJA1029 is in Reset mode, it ignores all input signals and all output drivers are

7.2.2 Sleep mode

The TJA1029 consumes significantly less power in Sleep mode than in Normal mode.

Even though current consumption is extremely low in Sleep mode, the TJA1029 can still

be woken up remotely via pin LIN or activated directly via pin SLP_N. Filters on the

receiver input (LIN) and on pin SLP_N prevent unwanted wake-up events occurring due to

automotive transients or radio frequency interference. All wake-up events must be

A falling edge on pin SLP_N in Normal mode initiates a transition to Sleep mode. The LIN

transmit path is immediately disabled when pin SLP_N goes LOW. In order to ensure the

TJA1029 switches successfully to Sleep mode, the sleep command (pin SLP_N = LOW)

Sleep mode activation is independent of the levels on pins LIN or TXD. So the lowest

possible power consumption can be guaranteed, even when there is a continuous

dominant level on pins LIN and TXD.

7.2.3 Standby mode

Standby mode is activated automatically when a local or remote wake-up event occurs

while the TJA1029 is in Sleep mode. In Standby mode, pin RXD is held LOW to provide

an interrupt flag for the microcontroller.

7.2.4 Normal mode

In Normal mode, the TJA1029 can transmit and receive data via the LIN bus.

The receiver detects the data stream on the LIN bus input pin and transfers it via pin RXD

to the microcontroller (see Figure 6): HIGH for a recessive level and LOW for a dominant

level on the bus. The receiver has a supply-voltage related threshold with hysteresis and

an integrated filter to suppress bus line noise.

The transmitter converts the transmit data stream from the protocol controller, detected on

pin TXD, into an optimized bus signal. The optimized bus signal is shaped to minimize

EME. The LIN bus output pin is pulled HIGH via an internal slave termination resistor. For

and pin LIN (see Figure 6).

If pin SLP_N is pulled HIGH while the TJA1029 is in Sleep or Standby mode, the LIN