tja1027 NXP Semiconductors, tja1027 Datasheet - Page 7

• Manufacturer Part Number: tja1027
• Description: Lin 2.2/sae J2602 Transceiver
• Manufacturer: NXP Semiconductors

NXP Semiconductors
TJA1027
Product data sheet
7.2.1 Reset mode
7.2.2 Sleep mode
7.2.3 Standby mode
7.2.4 Normal mode
When the TJA1027 is in Reset mode, it ignores all input signals and all output drivers are
off. The TJA1027 switches to Reset mode when the voltage on V
LOW-level power-on reset threshold, V
HIGH-level power-on reset threshold, V
The TJA1027 consumes significantly less power in Sleep mode than in any other mode.
Even though current consumption is extremely low in Sleep mode, the TJA1027 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 of time (t
Sleep mode is initiated by a falling edge on pin SLP_N in Normal mode. The LIN transmit
path is immediately disabled when pin SLP_N goes LOW. In order to ensure the TJA1027
switches successfully to Sleep mode, the sleep command (pin SLP_N = LOW) must be
maintained for at least t
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.
Standby mode is activated automatically when a local or remote wake-up event occurs
while the TJA1027 is in Sleep mode. In Standby mode, pin RXD is held LOW to provide
an interrupt flag for the microcontroller.
In Normal mode, the TJA1027 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
level on the bus. The receiver has a supply-voltage related threshold with hysteresis and
an integrated filter to suppress bus line noise.
The transmit data stream from the protocol controller is detected on pin TXD and is
converted by the transmitter into an optimized bus signal shaped to minimize EME. The
LIN bus output pin is pulled HIGH via an internal slave termination resistor. For a master
application, an external resistor in series with a diode should be connected between pin
V
If pin SLP_N is pulled HIGH while the TJA1027 is in Sleep or Standby mode, the LIN
transceiver switches to Normal mode after t
BAT
and pin LIN (see
All information provided in this document is subject to legal disclaimers.
Rev. 1 — 20 October 2011
Figure
gotosleep
Figure
6).
.
6): HIGH for a recessive level and LOW for a dominant
th(POR)L
th(POR)H
wake(dom)LIN
gotonorm
. When the voltage on V
, the TJA1027 switches to Sleep mode.
.
or t
gotonorm
LIN 2.2/SAE J2602 transceiver
).
BAT
drops below the
BAT
TJA1027
© NXP B.V. 2011. All rights reserved.
rises above the
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