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 9 of 25
NXP Semiconductors
TJA1024
Quad LIN 2.2A/SAE J2602 transceiver
7.3 Transceiver wake-up
7.3.1 Remote wake-up via the LIN bus
A falling edge on pin LINx followed by a LOW level maintained for t
wake(dom)LIN
followed by
a rising edge on pin LINx triggers a remote wake-up (see Figure 4
). It should be noted that
the time period t
wake(dom)LIN
is measured either in Normal mode while TXDx is HIGH, or in
Sleep mode irrespective of the status of pin TXDx.
7.3.2 Wake-up via SLPx_N
If SLPx_N is held HIGH for t
gotonorm
, the transceiver switches from Sleep mode to Normal
mode.
7.4 Operation during automotive cranking pulses
TJA1024 remains fully operational during automotive cranking pulses because the LIN
transceivers are fully specified down to V
BATx
= 5 V.
7.5 Operation when supply voltage is outside specified operating range
If V
BAT1
and/or V
BAT2
> 18 V or < 5 V, the respective dual transceiver block may remain
operational, but parameter values cannot be guaranteed to remain within the operating
ranges specified in Table 7
and Table 8 for the relevant transceiver block (LIN1/LIN2 or
LIN3/LIN4).
In Normal mode:
• If the input level on pin TXDx is HIGH, the LIN transmitter output on pin LINx will be
recessive.
• If the input level on pin LINx is recessive, the receiver output on pin RXDx will be
HIGH.
• If the voltage on pin V
BATx
rises to 27 V (e.g. during an automotive jump-start), the
total LIN network pull-up resistance should be greater than 680 and the total LIN
network capacitance should be less than 6.8 nF to ensure reliable LIN data transfer.
• If the voltage on pin V
BATx
drops below the LOW-level V
BAT
LOW threshold,
V
th(VBATL)L
, the active LIN transmit path(s) is interrupted and both associated LIN
outputs will be recessive. The previously active LIN transmit path(s) is switched on
again when V
BATx
rises above V
th(VBATL)H
and pin TXDx is HIGH.
Fig 4. Remote wake-up behavior
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