tja1055 NXP Semiconductors, tja1055 Datasheet - Page 7

• Manufacturer Part Number: tja1055
• Description: Tja1055 Enhanced Fault-tolerant Can Transceiver
• Manufacturer: NXP Semiconductors

NXP Semiconductors
TJA1055_3
Product data sheet
7.2 Low power modes
The transceiver provides three low power modes which can be entered and exited via
The sleep mode is the mode with the lowest power consumption. Pin INH is switched to
HIGH-impedance for deactivation of the external voltage regulator. Pin CANL is biased to
the battery voltage via pin RTL. Pins RXD and ERR will signal the wake-up interrupt even
in case V
The standby mode operates in the same way as the sleep mode but with a HIGH level on
pin INH.
The power-on standby mode is the same as the standby mode, however, in this mode the
battery power-on flag is shown on pin ERR instead of the wake-up interrupt signal. The
output on pin RXD will show the wake-up interrupt. This mode is only for reading out the
power-on flag.
Table 5.
[1]
[2]
[3]
[4]
[5]
Wake-up requests are recognized by the transceiver through two possible channels:
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
Mode
Goto-sleep
command
Sleep
Standby
Power-on
standby
Normal
operating
STB and EN (see
•
•
Wake-up interrupts are released when entering normal operating mode.
For TJA1055T a diode is added in series with the high-side driver of ERR and RXD to prevent a reverse
current from ERR to V
For TJA1055T/3, ERR and RXD are open-drain.
In case the goto-sleep command was used before. When V
the fail-safe functionality this does not effect the internal functions.
V
The bus lines for remote wake-up
Pin WAKE for local wake-up
BAT
power-on flag will be reset when entering normal operating mode.
CC
Normal operating and low power modes
is not present.
Pin STB
LOW
LOW
LOW
HIGH
HIGH
Table 5
CC
Rev. 03 — 13 March 2007
Pin EN
HIGH
LOW
LOW
LOW
HIGH
in the unpowered state.
and
[4]
Figure
Pin ERR
LOW
wake-up
interrupt
signal
V
power-on
flag
error flag
BAT
[5]
3).
[1]
HIGH
[2][3]
no error
flag
Enhanced fault-tolerant CAN transceiver
CC
dom(CANH)
drops, pin EN will become LOW, but due to
Pin RXD
LOW
wake-up
interrupt
signal
wake-up
interrupt
signal
dominant
received
data
or t
[1]
[1]
dom(CANL)
HIGH
[2][3]
recessive
received
data
© NXP B.V. 2007. All rights reserved.
TJA1055
in it is required.
Pin RTL
switched
to
V
V
V
BAT
BAT
CC
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