uja1023 NXP Semiconductors, uja1023 Datasheet - Page 35

• Manufacturer Part Number: uja1023
• Description: Uja1023 Lin-i/o Slave
• Manufacturer: NXP Semiconductors

Philips Semiconductors
UJA1023_4
Product data sheet
Figure 13
termination.
The first mode after power-on is the Off-line mode. The transmitter and receiver are both
switched off, but wake-up events will be recognized. Any LIN wake-up event will wake-up
the UJA1023.
Within Sleep mode any wake-up event is automatically forwarded to the LIN (protocol)
controller, the Normal mode will be entered and the LIN-transceiver automatically enters
the Active mode. It should be noted that the first message (wake-up message) will be lost
when no wake-up signal has been received before.
The differences between Active, Off-line and Fail silent mode are:
Fig 13. LIN transceiver states
•
•
•
In Off-line and Fail silent mode the transmitter is off, whereas in Active mode the
transmitter is enabled
During active state with no short-circuit between LIN and GND the internal termination
switch RTLIN provides an internal 30 k pull-up resistor to V
is shorted to GND for longer than t
make sure that no current is discharging the battery unintentionally and Fail silent
mode will be entered
After failure recovery (in fail silent) when the LIN bus is recessive again the Off-line
mode is entered and activates a weak termination of 75 A
TX = Transmitter.
RX = Receiver.
LPRX = Low-power receiver.
RTLIN = LIN termination.
shows the states of the complete LIN transceiver including RTLIN for LIN
RTLIN: 30 k
LPRX: on
sleep or LH sleep
Active
RX: on
TX: on
t
to(idle)
or
Rev. 04 — 5 July 2006
remote wake-up
local wake-up
or
to(dom)
RTLIN: 75 A
local wake-up
LPRX: on
Off-line
RX: off
t
TX: off
to(dom)
, the RTLIN switch switches off in order to
or undervoltage
t
to(rec)
power-on
© Koninklijke Philips Electronics N.V. 2006. All rights reserved.
BAT
t
to(dom)
Fail silent
. In case the LIN wire
RTLIN: off
LPRX: on
TX: off
RX: off
UJA1023
mce652
LIN-I/O slave
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