tja1028 NXP Semiconductors, tja1028 Datasheet - Page 6

• Manufacturer Part Number: tja1028
• Description: Tja1028 Lin Transceiver With Integrated Voltage Regulator
• Manufacturer: NXP Semiconductors

NXP Semiconductors
TJA1028
Product data sheet
7.1.3.1 The LIN transceiver in Normal mode
7.1.3 Normal mode
7.1.4 Sleep mode
7.1.5 Transition from Normal to Sleep or Standby mode
The TJA1028 switches from Off mode to Standby mode as soon as the battery supply
voltage rises above the power-on detection threshold (V
junction temperature is below the overtemperature protection release threshold
(T
The TJA1028 switches to Standby mode from Normal mode during the mode select
window if TXD is HIGH and EN is LOW (see
A remote wake-up event will trigger a transition to Standby mode from Sleep mode. The
remote wake-up event will be signalled by a continuous LOW level on pin RXD.
In Standby mode, the voltage regulator is on, the LIN physical layer is disabled and
remote wake-up detection is active. The wake-up source is indicated by the level on RXD
(LOW indicates a remote wake-up).
If the EN pin is pulled HIGH while the TJA1028 is in Standby mode (with RSTN = 1) or
Sleep mode, the device will enter Normal mode. The LIN physical layer and the voltage
regulator are enabled in Normal mode.
The LIN transceiver is activated when the TJA1028 enters Normal mode.
In Normal mode, the transceiver can transmit and receive data via the LIN bus. The
receiver detects data streams on the LIN pin and transfers them to the microcontroller via
pin RXD. LIN recessive is represented by a HIGH level on RXD, LIN dominant by a LOW
level.
The transmit data streams of the protocol controller at the TXD input are converted by the
transmitter into bus signals with optimized slew rate and wave shaping to minimize EME.
A LOW level at the TXD input is converted to a LIN dominant level while a HIGH level is
converted to a LIN recessive level.
Sleep mode features extremely low power consumption.
The TJA1028 switches to Sleep mode from Normal mode during the mode select window
if TXD and EN are both LOW (see
The voltage regulator and the LIN physical layer are disabled in Sleep mode. Pin RSTN is
forced LOW. Remote wake-up detection is active.
When EN is driven LOW in Normal mode, the TJA1028 disables the transmit path. The
mode select window opens t
after EN goes LOW (see
The TXD pin is sampled in the mode select window. A transition to Standby mode is
triggered if TXD is HIGH, or to Sleep mode if TXD is LOW.
vj
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th(rel)otp
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All information provided in this document is subject to legal disclaimers.
Rev. 2 — 25 February 2011
Figure
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Section
after EN goes LOW, and remains open until t
LIN transceiver with integrated voltage regulator
7.1.5), provided RSTN = 1.
Section
7.1.5), provided RSTN = 1.
BAT
> V
th(det)pon
TJA1028
), provided the
© NXP B.V. 2011. All rights reserved.
msel(max)
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