TJA1054T NXP Semiconductors, TJA1054T Datasheet - Page 8

• Manufacturer Part Number: TJA1054T
• Manufacturer: NXP Semiconductors

Specifications of TJA1054T

• Number Of Transceivers: 1
• Power Down Mode: Sleep/Standby
• Operating Supply Voltage (max): 5.25V
• Operating Supply Voltage (typ): 5V
• Operating Supply Voltage (min): 4.75V
• Package Type: SO
• Operating Temperature (max): 150C
• Operating Temperature (min): -40C
• Operating Temperature Classification: Automotive
• Mounting: Surface Mount
• Pin Count: 14
• Lead Free Status / RoHS Status: Compliant

NXP Semiconductors
TJA1054
Product data sheet
7.3 Power-on
7.4 Protections
A local wake-up through pin WAKE is detected by a rising or falling edge with a
consecutive level exceeding the maximum specified t
On a wake-up request the transceiver will set the output on pin INH to HIGH which can be
used to activate the external supply voltage regulator.
If V
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
recommended to connect a not used pin WAKE to pin BAT. 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
Pin INH will be set to a HIGH level again by the following events only:
To provide fail-safe functionality, the signals on pins STB and EN will internally be set to
LOW when V
After power-on (V
power-on flag will be set. 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.
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.
•
•
•
•
CC
V
Rising or falling edge on pin WAKE
A message frame with a dominant phase of at least the maximum specified t
t
Pin STB goes to a HIGH level with V
(CANL)
BAT
is provided the wake-up request can be read on the ERR or RXD outputs, so the
power-on (cold start)
h(sleep)
, while pin EN or pin STB is at a LOW level
CC
All information provided in this document is subject to legal disclaimers.
.
is below a certain threshold voltage (V
BAT
switched on) the signal on pin INH will become HIGH and an internal
Rev. 4 — 3 August 2010
BAT
. However, in order to prevent EMC issues, it is
CC
active
WAKE
CC(stb)
Fault-tolerant CAN transceiver
.
).
TJA1054
© NXP B.V. 2010. All rights reserved.
(CANH)
8 of 25
or