TJA1054T ,Fault-tolerant CAN transceiverINTEGRATED CIRCUITSDATA SHEETTJA1054Fault-tolerant CAN transceiver1999 Feb 11Preliminary specificati ..
TJA1054T/N1 ,Fault-tolerant CAN transceiver
TJA1054T/N1 ,Fault-tolerant CAN transceiver
TJA1055T ,Enhanced fault-tolerant CAN transceiverFeatures and benefits2.1 Optimized for in-car low-speed communication Pin-to-pin compatible with T ..
TJM4558 ,WIDE BANDWIDTH DUAL BIPOLAR OPERATIONAL AMPLIFIERSfeaturesof the MC1458 and, in addition possesses threetimes the unity gain bandwidth of the industr ..
TJM4558C ,WIDE BANDWIDTH DUAL BIPOLAR OPERATIONAL AMPLIFIERSfeaturesof the MC1458 and, in addition possesses threetimes the unity gain bandwidth of the industr ..
TLP197D. ,Photocoupler PhotorelayPin Configuration (top view) Weight: 0.13 g (typ.) 1 6 1: Anode 2: Cathode 4: Drain D12 5 5: Sourc ..
TLP197G ,Photocoupler GaAs Ired & Photo-MOS FETPin Configuration (top view) Schematic 1-Form-a6 41 1 : Anode 6 612 : Cathode 3 : NC 25 524 : Drain ..
TLP197G. ,Photocoupler GaAs Ired & Photo-MOS FETTLP197G TOSHIBA Photocoupler GaAs Ired & Photo-MOS FET TLP197G Modem Unit in mmFax PBX Measure ..
TLP197GA. ,Photocoupler PhotorelayPin Configuration (top view)JEITA ― TOSHIBA 11-7C1 Weight: 0.13 g (typ.) 1 6 1: ANODE 2: CATHODE3 ..
TLP200D. ,PHOTOCOUPLER GaAs IRED & PHOTO-MOS FETPIN CONFIGURATION (TOP VIEW)2-Form-AT/T mgr",l,,l,e",1,VU, I36 C''l13:ANODE//: CATHUUE: DRAIN D1: D ..
TLP202G ,Photocoupler PhotorelayPin Configuration (top view) 1 8 2 7 1, 3 : Anode 2, 4 : Cathode 3 6 5 : Drain D1 6 : Drain D2 7 : ..
TJA1054T
Fault-tolerant CAN transceiver
Philips Semiconductors Preliminary specification
Fault-tolerant CAN transceiver TJA1054
FEATURES
Optimized for in-car low-speed communication Baud rate up to 125 kBaud Up to 32 nodes can be connected Supports unshielded bus wires Very low Radio Frequency Interference (RFI) due to
built-in slope control function and a very good matching
of the CANL and CANH bus outputs Fully integrated receiver filters Permanent dominant monitoring of transmit data input Good immunity performance of ElectroMagnetic
Compatibility (EMC) in normal operating mode and in
low power modes.
Bus failure management Supports single-wire transmission modes with ground
offset voltages up to 1.5V Automatic switching to single-wire mode in the event of
bus failures, even when the CANH bus wire is
short-circuited to VCC Automatic reset to differential mode if bus failure is
removed Fully wake-up capability during failure modes.
Protection Short-circuit proof to battery and ground inV powered systems Thermally protected Bus lines protected against transients in an automotive
environment An unpowered node does not disturb the bus lines.
Support for low power modes Low current sleep and standby mode with wake-up via
the bus lines Power-on reset flag on the output.
GENERAL DESCRIPTIONThe TJA1054 is the interface between the protocol
controller and the physical wires of the bus lines in a
Control Area Network (CAN). It is primarily intended for
low-speed applications, up to 125 kBaud, in passenger
cars. The device provides differential transmit capability
but will switch in error conditions to single-wire transmitter
and/or receiver.
The TJA1054T is pin and upwards compatible with the
PCA82C252T and the TJA1053T. This means that these
two devices can be replaced by the TJA1054T with
retention of all functions.
The most important improvements are: Very low RFI due to a very good matching of the CANL
and CANH bus lines outputs Good immunity performance of EMC, especially in low
power modes Fully wake-up capability during failure modes Extended bus failure management including
short-circuit of the CANH bus line to VCC Supports easy fault localization Two-edge sensitive wake-up input signal via pin WAKE.
ORDERING INFORMATION
Philips Semiconductors Preliminary specification
Fault-tolerant CAN transceiver TJA1054
QUICK REFERENCE DATA
Philips Semiconductors Preliminary specification
Fault-tolerant CAN transceiver TJA1054
BLOCK DIAGRAM
Philips Semiconductors Preliminary specification
Fault-tolerant CAN transceiver TJA1054
PINNING
Philips Semiconductors Preliminary specification
Fault-tolerant CAN transceiver TJA1054
FUNCTIONAL DESCRIPTIONThe TJA1054 is the interface between the CAN protocol
controller and the physical wires of the CAN bus
(see Fig.7). It is primarily intended for low speed
applications, up to 125 kBaud, in passenger cars.
The device provides differential transmit capability to the
CAN bus and differential receive capability to the CAN
controller.
To reduce RFI, the rise and fall slope are limited. This
allows the use of an unshielded twisted pair or a parallel
pair of wires for the bus lines. Moreover, it supports
transmission capability on either bus line if one of the wires
is corrupted. The failure detection logic automatically
selects a suitable transmission mode.
In normal operating mode (no wiring failures) the
differential receiver is output on pin RXD (see Fig.1).
The differential receiver inputs are connected to
pins CANH and CANL through integrated filters.
The filtered input signals are also used for the single-wire
receivers. The receivers connected to pins CANH
and CANL have threshold voltages that ensure a
maximum noise margin in single-wire mode.
A timer has been integrated at pin TXD. This timer
prevents the TJA1054 from driving the bus lines to a
permanent dominant state.
Failure detectorThe failure detector is fully active in the normal operating
mode. After the detection of a single bus failure the
detector switches to the appropriate mode (see Table1).
Table 1 Bus failures
The differential receiver threshold voltage is set at
−3.2V typically (VCC=5 V). This ensures correct
reception with a noise margin as high as possible in the
normal operating mode and in the event of failures 1, 2, and 6a. These failures, or recovery from them, do not
destroy ongoing transmissions.
Failures 3 and 6 are detected by comparators connected
to the CANH and CANL bus lines, respectively. If the
comparator threshold is exceeded for a certain period of
time, the reception is switched to the single-wire mode.
This time is needed to avoid false triggering by external RF
fields. Recovery from these failures is detected
automatically after a certain time-out (filtering) and no
transmission is lost. In the event of failure 3 the CANH
driver and pin RTH are switched off. In the event of
failure 6 the CANL driver and pin RTL are switched off.
The pull-up current on pin RTL and the pull-down current
on pin RTH will not be switched off.
Failures 3a,4 and 7 initially result in a permanent
dominant level on pin RXD. After a time-out, the CANL
driver and pin RTL are switched off (failures4 and 7) or
the CANH driver and pin RTH are switched off (failure 3a).
Only a weak pull-up on pin RTL or a weak pull-down on
pin RTH remains. Reception continues by switching to the
single-wire mode via pins CANH or CANL. When
failures 3a, 4 or 7 are removed, the recessive bus levels
are restored. If the differential voltage remains below the
recessive threshold level for a certain period of time,
reception and transmission switch back to the differential
mode.
If any of the wiring failure occurs, the output signal on
pin ERR will become LOW. On error recovery, the output
signal on pin ERR will become HIGH again.
During all single-wire transmissions, the EMC
performance (both immunity and emission) is worse than
in the differential mode. The integrated receiver filters
suppress any HF noise induced into the bus wires.
The cut-off frequency of these filters is a compromise
between propagation delay and HF suppression. In the
single-wire mode, LF noise cannot be distinguished from
the required signal.
Philips Semiconductors Preliminary specification
Fault-tolerant CAN transceiver TJA1054
Low power modesThe transceiver provides 3 low power modes which can be
entered and exited via pins STB and EN (see Table 2 and
Fig.3).
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. If the supply
voltage is provided pins RXD and ERR will signal the
wake-up interrupt signal.
The standby mode will react the same as the Sleep mode
but with a HIGH-level on pin INH.
The power-on standby mode is the same as the standby
mode with the battery power-on flag instead of the
wake-up interrupt signal on pin ERR. The output on
pin RXD will show the wake-up interrupt. This mode is only
for reading out the power-on flag.
Wake-up requests are recognized by the transceiver when
a dominant signal is detected on either bus line or if
pin WAKE detects an edge (rising or falling) which stays
longer HIGH or LOW respectively during a certain period
of time. On a wake-up request the transceiver will set the
output on pin INH which can be used to activate the
external supply voltage regulator.
If VCC is provided the wake-up request can be read on the
ERR or RXD outputs, so the external microcontroller can
wake-up the transceiver (switch to normal operating
mode) via pins STB and EN.
To prevent false 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
failures3, 3a,4 and7.
Pin INH is set to floating only during the goto-sleep
command and stays floating during the Sleep mode. If
pin INH is set to floating, pin INH will not be set to
HIGH-level again just by a mode change to normal
operating mode. Pin INH will be set to HIGH-level by the
following events only: power-on (VBAT switching-on at cold start) rising or falling edge on pin WAKE a message with 5 consecutive dominant bits during
pin EN or pin STB is at LOW-level.
The signals on pins STB and EN will internally be set to
LOW-level when VCC is below a certain threshold voltage
so providing fail safe functionality.
Table 2 Normal operating and low power modes
Notes In case the goto-sleep command was used before. When VCC drops pin EN will become LOW, but this does not effect
the internal functions due to the fail safe functionality. If the supply voltage VCC is present. Wake-up interrupts are released when entering the normal operating mode. VBAT power-on flag will be reset when entering the normal operating mode.
Philips Semiconductors Preliminary specification
Fault-tolerant CAN transceiver TJA1054
Power-onAfter power-on (VBAT switched on) the signal on pin INH will become HIGH and an internal power-on flag will be set. This
flag can be read in the power-on standby mode via pin ERR (STB= 1; EN= 0) and will be reset by entering the normal
operating mode.
ProtectionsA current limiting circuit protects the transmitter output stages against short-circuit to positive and negative battery
voltage.
If the junction temperature exceeds a maximum value, 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 IC will remain operating.
The pins CANH and CANL are protected against electrical transients which may occur in an automotive environment.
Philips Semiconductors Preliminary specification
Fault-tolerant CAN transceiver TJA1054
LIMITING VALUESIn accordance with the Absolute Maximum Rating System (IEC 134); note1.
Notes All voltages are defined with respect to pin GND. Positive current flows into the IC. Junction temperature in accordance with “IEC 747-1”. An alternative definition is: Tvj =Tamb +P× Rth(vj-a) where
Rth(vj-a) is a fixed value to be used for the calculation of Tvj. The rating for Tvj limits the allowable combinations of
power dissipation (P) and operating ambient temperature (Tamb). Equivalent to discharging a 100 pF capacitor through a 1.5 kΩ resistor. Equivalent to discharging a 200 pF capacitor through a 10 Ω resistor and a 0.75 μH coil.
THERMAL CHARACTERISTICS
QUALITY SPECIFICATIONQuality specification in accordance with “SNW-FQ-611-Part-E”.
Philips Semiconductors Preliminary specification
Fault-tolerant CAN transceiver TJA1054
DC CHARACTERISTICSVCC= 4.75to 5.25 V; VBAT=5to27 V; VSTB =VCC; Tamb= −40to +125 °C; unless otherwise specified. All voltages are
defined with respect to ground. Positive currents flow into the IC. All parameters are guaranteed over the temperature
range by design, but only 100% tested at 25 °C.
