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參數(shù)資料
| 型號： | TJA1054A |
| 廠商： | NXP Semiconductors N.V. |
| 元件分類： | CAN |
| 英文描述： | Fault-tolerant CAN transceiver |
| 中文描述： | 容錯CAN收發(fā)器 |
| 文件頁數(shù)： | 8/25頁 |
| 文件大?。?/td> | 144K |
| 代理商： | TJA1054A |
2004 Mar 23
8
Philips Semiconductors
Product specification
Fault-tolerant CAN transceiver
TJA1054A
3.
4.
A local or remote wake-up event will be signalled at the transceiver pins RXD and NERR if V
BAT
= 5.3 V to 27 V.
In case the goto-sleep command was used before. When V
CC
drops, pin EN will become LOW, but due to the
fail-safe functionality this does not effect the internal functions.
V
BAT
power-on flag will be reset when entering normal operating mode.
5.
Wake-up requests are recognized by the transceiver
through two possible channels:
The bus lines for remote wake-up
Pin WAKE for local wake-up.
In order to wake-up the transceiver remotely through the
bus lines, a filter mechanism is integrated. This
mechanism makes sure that noise and any present bus
failure conditions do not result into an erroneous wake-up.
Because of this mechanism it is not sufficient to simply pull
the CANH or CANL bus lines to a dominant level for a
certain time. To guarantee a successful remote wake-up
under all conditions, a message frame with a dominant
phase of at least the maximum specified t
CANH
or t
CANL
in
it is required.
A local wake-up through pin WAKE is detected by a rising
or falling edge with a consecutive level with the maximum
specified t
WAKE
.
On a wake-up request the transceiver will set the output on
pin INHtoHIGHwhichcanbeusedtoactivatetheexternal
supply voltage regulator.
If V
CC
is provided the wake-up request can be read on the
ERR or RXD outputs, so the external microcontroller can
activate the transceiver (switch to normal operating mode)
via pins STB and EN.
To prevent a false remote wake-up due to transients or
RF fields, the wake-up voltage levels have to be
maintained for a certain period of time. In the low power
modes the failure detection circuit remains partly active to
prevent an increased power consumption in the event of
failures 3, 3a, 4 and 7.
To prevent a false local wake-up during an open wire at
pin WAKE, this pin has a weak pull-up current source
towards V
BAT
. However, in order to prevent EMC issues, it
is recommended to connect a not used pin WAKE to pin
BAT. Pin INH is set to floating only if the goto-sleep
command is entered successfully. To enter a successful
goto-sleep command under all conditions, this command
must be kept stable for the maximum specified t
h(sleep)
.
Pin INH will be set to a HIGH level again by the following
events only:
V
BAT
power-on (cold start)
Rising or falling edge on pin WAKE
A message frame with a dominant phase of at least the
maximum specified t
CANH
or t
CANL
, while pin EN or
pin STB is at a LOW level
Pin STB goes to a HIGH level with V
CC
active.
To provide fail-safe functionality, the signals on pins STB
and EN will internally be set to LOW when V
CC
is below a
certain threshold voltage (V
CC(stb)
).
Power-on
After power-on (V
BAT
switched on) the signal on pin INH
willbecomeHIGHandaninternalpower-onflagwillbeset.
This flag can be read in the power-on standby mode
through pin ERR (STB = 1; EN = 0) and will be reset by
entering the normal operating mode.
Protections
A current limiting circuit protects the transmitter output
stages against short-circuit to positive and negative
battery voltage.
If the junction temperature exceeds the typical value of
165
°
C, the transmitter output stages are disabled.
Because the transmitter is responsible for the major part of
the power dissipation, this will result in a reduced power
dissipation and hence a lower chip temperature. All other
parts of the device will continue to operate.
The pins CANH and CANL are protected against electrical
transients which may occur in an automotive environment.
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