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TJA1022TK,118

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P28
TJA1022 All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2018. All rights reserved.
Product data sheet Rev. 3 — 24 May 2018 7 of 28
NXP Semiconductors
TJA1022
Dual 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 both transceivers are in Sleep mode.
The voltage levels on LINx and TXDx have no effect on a transition to Sleep mode. So the
transceiver will still switch 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 both transceivers are in Sleep
mode, the TJA1022 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 and LIN 2) and on
pins SLPx_N prevent unwanted wake-up events occurring due to automotive transients or
radio frequency interference. To be valid, all wake-up events must be maintained for a
specific length of time (t
wake(dom)LIN
for a remote wake-up and t
gotonorm
for a wake-up via
SLPx_N). Pin RXDx is floating when a transceiver is in Sleep mode.
(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, both LIN transceivers are disabled.
(2) Power dissipation is at a minimum when both 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 (RXD1 or
RXD2) will be LOW to indicate which LIN channel was the source of the wake-up request.
Fig 4. State diagram
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TJA1022 All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2018. All rights reserved.
Product data sheet Rev. 3 — 24 May 2018 8 of 28
NXP Semiconductors
TJA1022
Dual LIN 2.2A/SAE J2602 transceiver
If a remote wake-up event (see Figure 5) is detected on either of the LIN bus lines, the
associated transceiver will switch to Standby mode. A wake-up initiated by the
microcontroller (SLPx_N HIGH for t
gotonorm
) will cause the relevant transceiver to switch to
Normal mode while the other transceiver remains in its current state.
7.2.3 Standby mode
Standby mode is an intermediate mode between Sleep and Normal modes. A transceiver
will switch from Sleep mode to Standby mode in response to a LIN bus wake-up event.
Pin RXDx will go low to indicate to the microcontroller the source of the remote wake-up
(LIN1 or LIN2). A transceiver will switch from Standby to Normal mode if the
microcontroller holds SLPx_N HIGH for t
gotonorm
.
7.2.4 Reset mode
When the TJA1022 is in Reset mode, all input signals are ignored and all output drivers
are off. The TJA1022 switches to Reset mode when the voltage on V
BAT
drops below the
LOW-level power-on reset threshold, V
th(POR)L
. When the voltage on V
BAT
rises above the
HIGH-level power-on reset threshold, V
th(POR)H
, the transceivers switch to Sleep mode.
[1] Both transceivers enter Sleep mode after a power-on reset (e.g. after switching on V
BAT
).
[2] The appropriate transceiver will switch automatically to Standby x mode if a remote LINx wake-up event is
detected in Sleep x mode.
[3] RXDx will be LOW to indicate the source of the remote wake-up request; RXDx will go HIGH in response to
a positive edge on pin SLPx_N.
[4] A positive edge on SLPx_N will trigger a transition to Normal mode; the transmitter will be off if TXDx is
LOW and will be enabled as soon as TXDx goes HIGH.
Table 5. Operating modes
Mode SLPx_N RXDx Transmitter x Description
Reset x floating off all inputs ignored; all output
drivers off
Sleep x
[1]
0 floating off no wake-up request detected
Standby x
[2]
0LOW
[3]
off remote wake-up request
detected
Normal x 1 HIGH: recessive
LOW: dominant
on/off
[4]
bus signal shaping enabled
TJA1022 All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2018. All rights reserved.
Product data sheet Rev. 3 — 24 May 2018 9 of 28
NXP Semiconductors
TJA1022
Dual 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 5
). 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 will switch from Sleep mode to
Normal mode.
7.4 Operation during automotive cranking pulses
TJA1022 remains fully operational during automotive cranking pulses because the LIN
transceivers are fully specified down to V
BAT
= 5 V.
7.5 Operation when supply voltage is outside specified operating range
If V
BAT
> 18 V or V
BAT
< 5 V, the TJA1022 may remain operational, but parameter values
cannot be guaranteed to remain within the operating ranges specified in Table 8
and
Table 9
.
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
BAT
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
BAT
drops below the LOW-level V
BAT
LOW threshold, V
th(VBATL)L
,
the active LIN transmit path(s) is interrupted and both LIN outputs will be recessive.
The previously active LIN transmit path(s) is switched on again when V
BAT
rises
above V
th(VBATL)H
and the associated TXDx pin is HIGH.
Fig 5. Remote wake-up behavior
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P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P28

TJA1022TK,118

Mfr. #:
Buy TJA1022TK,118
Manufacturer:
NXP Semiconductors
Description:
LIN Transceivers DUAL LIN 5-18V
Lifecycle:
New from this manufacturer.
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