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TJA1050TN/a44avaiHigh speed CAN transceiver


TJA1050T ,High speed CAN transceiverINTEGRATED CIRCUITSDATA SHEETTJA1050High speed CAN transceiverPreliminary specification 1999 Sep 27F ..
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TJA1050T
High speed CAN transceiver

Philips Semiconductors Preliminary specification
High speed CAN transceiver TJA1050
FEATURES
Fully compatible with the “ISO 11898” standard High speed (up to 1 Mbaud) Transmit Data (TXD) dominant time-out function Bus lines protected against transientsinan automotive
environment Silent mode in which the transmitter is disabled Differential receiver with wide common-mode rangefor
high ElectroMagnetic Immunity (EMI) Input levels compatible with 3.3 V devices Thermally protected Short-circuit proof to battery and ground An unpowered node does not disturb the bus lines At least 110 nodes can be connected.
GENERAL DESCRIPTION

The TJA1050 is the interface between the CAN protocol
controller and the physical bus. The device provides
differential transmit capability to the bus and differential
receive capability to the CAN controller.
The TJA1050 is the successor to the PCA82C250 high
speed CAN transceiver. The most important
improvements are: Much lower ElectroMagnetic Emission (EME) due to
optimal matchingof the CANH and CANL output signals Improved behaviour in case of an unpowered node.
QUICK REFERENCE DATA
ORDERING INFORMATION
Philips Semiconductors Preliminary specification
High speed CAN transceiver TJA1050
BLOCK DIAGRAM
PINNING
Philips Semiconductors Preliminary specification
High speed CAN transceiver TJA1050
FUNCTIONAL DESCRIPTION

The TJA1050 is the interface between the CAN protocol
controller and the physical bus.Itis primarily intendedfor
high speed automotive applications using baud rates from kbaud up to 1 Mbaud. It provides differential transmit
capability to the bus and differential receiver capability to
the CAN protocol controller. It is fully compatible to the
“ISO 11898” standard.
A current-limiting circuit protects the transmitter output
stage from damage caused by accidental short-circuit to
either positiveor negative battery voltage, although power
dissipation increases during this fault condition.
Athermal protection circuitprotects theIC fromdamageby
switching off the transmitter if the junction temperature
exceeds a value of approximately 165 °C. Because the
transmitter dissipates most of the power, the power
dissipation and temperatureof theICis reduced.All other functions continueto operate. The transmitter off-state
resets when TXD goes HIGH. The thermal protection
circuitis particularly needed whena bus line short-circuits.
The CANH and CANL lines are protected from automotive
electrical transients (according to “ISO 7637”; see Fig.6)
and are also protected from Electro-Static-Discharge
(ESD) of up to 4 kV from the human body.
Control lineS (pin 8) allows two operating modes to be
selected; high speed mode or silent mode.
High speed mode is the normal operating mode and is
selected by connecting pin S to ground. It is the default
mode if pin S is unconnected. the silent mode, the transmitteris disabled.All otherIC
functions continueto operate. The silent modeis selected
by connecting pin S to VCC. ‘TXD Dominant Time-out’ timer circuit prevents the bus
lines being driventoa permanent dominant state (blocking
all network communication) if TXD is forced permanently
LOW by a hardware and/or software application failure.
The timer is triggered by a negative edge on TXD. If the
duration of the LOW-level on TXD exceeds the internal
timer value, the transmitteris disabled, driving the bus into recessive state. The timeris resetbya positive edgeon
TXD.
Table 1
Function table of the CAN transceiver
(X = don’t care)
Philips Semiconductors Preliminary specification
High speed CAN transceiver TJA1050
LIMITING VALUES

In accordance with the Absolute Maximum Rating System (IEC 134). All voltages are referenced to GND (pin2).
Positive currents flow into the IC.
Notes
The waveformsof the applied transients shallbein accordance with “ISO 7637 part1”, test pulses1,2,3a and 3b,
(see Fig.6). In accordance with “IEC 747-1”.An alternative definitionofTjis:Tj =Tamb +P× Rth(j-a), where Rth(j-a)isa fixed value
to be used for the calculation of Tj. The rating for Tj limits the allowable combinations of power dissipation (P) and
ambient temperature (Tamb). Human body model; C= 100 pF R= 1.5 kΩ. Machine model; C= 200 pF R=25Ω.
THERMAL CHARACTERISTICS

According to IEC 747-1.
QUALITY SPECIFICATION

Quality specification “SNW-FQ-611 part D” is applicable.
Philips Semiconductors Preliminary specification
High speed CAN transceiver TJA1050
CHARACTERISTICS

VCC= 4.75to 5.25V; Tamb= −40to +125 °C;RL =60Ω unless specified otherwise;all voltages are referencedto GND
(pin2); positive currents flow into the IC;all parameters are guaranteed over the ambient temperature rangeby design,
but only 100% tested at Tamb =25 °C unless specified otherwise.
Philips Semiconductors Preliminary specification
High speed CAN transceiver TJA1050
Philips Semiconductors Preliminary specification
High speed CAN transceiver TJA1050
TEST AND APPLICATION INFORMATION
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