Datasheet
TJA1024 All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2015. All rights reserved.
Product data sheet Rev. 1 — 12 February 2015 7 of 25
NXP Semiconductors
TJA1024
Quad LIN 2.2A/SAE J2602 transceiver
7.2.2 Sleep mode
A transceiver will switch to Sleep mode from Normal mode if SLPx_N is held LOW for
t
gotosleep
. The relevant LIN transmit path is disabled as soon as SLPx_N goes LOW.
Power consumption is very low when all four transceivers are in Sleep mode.
The voltage levels on LINx and TXDx have no effect on a transition to Sleep mode. So the
transceiver switches to Sleep mode even if TXDx is held LOW or there is a continuous
dominant level on LINx (e.g. due to a short circuit to ground).
Although current consumption is extremely low when all four transceivers are in Sleep
mode, the TJA1024 can still be woken up remotely via the LIN bus pins or by the
microcontroller via pins SLPx_N. Filters on the receiver inputs (LIN1 to LIN4) and on pins
SLPx_N prevent unwanted wake-up events occurring due to automotive transients or
(1) A positive edge on SLPx_N triggers a transition to Normal mode in the corresponding LIN transceiver; the LIN transmitter is
enabled once TXDx goes HIGH. In the event of thermal shutdown, the transceivers in the affected dual transceiver block are
shut down (each block has its own temperature detection so the other two transceivers are not affected).
(2) Power dissipation is at a minimum when all four transceivers are in Sleep mode.
(3) When a transceiver switches to Standby mode in response to a LIN bus wake-up event, the associated RXDx pin will be LOW
to indicate which LIN channel was the source of the wake-up request.
Fig 3. State diagram
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