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TJA1029 Datasheet(PDF) 7 Page - NXP Semiconductors |
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TJA1029 Datasheet(HTML) 7 Page - NXP Semiconductors |
7 / 24 page 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 off. The TJA1029 switches to Reset mode when the voltage on VBAT drops below the LOW-level power-on reset threshold, Vth(POR)L. When the voltage on VBAT rises above the HIGH-level power-on reset threshold, Vth(POR)H, the TJA1029 switches to Sleep mode. 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 maintained for a specific period (twake(dom)LIN or tgotonorm). 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) must be maintained for at least tgotosleep. 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 a master application, connect an external resistor in series with a diode between pin VBAT and pin LIN (see Figure 6). If pin SLP_N is pulled HIGH while the TJA1029 is in Sleep or Standby mode, the LIN transceiver switches to Normal mode after tgotonorm. |
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