Philips TJA1050 Datasheet

INTEGRATED CIRCUITS

DATA SH EET

TJA1050

High speed CAN transceiver

Preliminary speciﬁcation File under Integrated Circuits, IC18

1999 Sep 27

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 transients in an automotive

environment

• Silent mode in which the transmitter is disabled

• Differential receiver with wide common-mode range for

high ElectroMagnetic Immunity (EMI)

• Input levels compatible with 3.3 V devices

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 matchingofthe CANH and CANL output signals

• Improved behaviour in case of an unpowered node.

• 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.

QUICK REFERENCE DATA

SYMBOL PARAMETER CONDITIONS MIN. MAX. UNIT

CANH

CANL

i(dif)(bus)

PD(TXD-RXD)

supply voltage 4.75 5.25 V DC voltage at CANH 0 < VCC< 5.25 V; no time limit −27 +40 V DC voltage at CANL differential bus input voltage dominant 1.5 3 V propagation delay TXD to RXD;

VS=0V − 250 ns

see Fig.4

amb

operating ambient temperature −40 +125 °C

ORDERING INFORMATION

TYPE

NUMBER

NAME DESCRIPTION VERSION

PACKAGE

TJA1050T SO8 plastic small outline package; 8 leads; body width 3.9 mm SOT96-1 TJA1050U − bare die −

1999 Sep 27 2

Philips Semiconductors Preliminary speciﬁcation

High speed CAN transceiver TJA1050

BLOCK DIAGRAM

PINNING

handbook, full pagewidth

TXD

RXD

0.5V

GND

25 kΩ

MGS374

CANH

CANL

60 µA

GND

200

µA

GND

ref

TXD

DOMINANT

TIME-OUT

TIMER

REFERENCE

VOLTAGE

RECEIVER

TJA1050

TEMPERATURE

PROTECTION

DRIVER

Fig.1 Block diagram.

SYMBOL PIN DESCRIPTION

TXD 1 transmit data input; reads in data

from the CAN controller to the bus

line drivers GND 2 ground V

3 supply voltage

RXD 4 receive data output; reads out

data from the bus lines to the

CAN controller V

ref

5 reference voltage output CANL 6 LOW-level CAN bus line CANH 7 HIGH-level CAN bus line S 8 select input for

high speed mode/silent mode

handbook, halfpage

TXD

RXD

TJA1050T

3 4

7 6 5

MGS375

Fig.2 Pin configuration.

S CANHGND CANL V

ref

1999 Sep 27 3

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. It is primarily intended for high speed automotive applications using baud rates from 40 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 positive or negative battery voltage, although power dissipation increases during this fault condition.

Athermalprotection circuit protects theICfromdamage by 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 temperature of the IC is reduced. All other IC functions continue to operate. The transmitter off-state resets when TXD goes HIGH. The thermal protection circuit is particularly needed whena bus line short-circuits.

The CANH and CANL lines are protected fromautomotive 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 line S (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.

In the silent mode, the transmitter is disabled. All other IC functions continue to operate. The silent mode is selected by connecting pin S to VCC.

A ‘TXD Dominant Time-out’ timer circuit prevents the bus linesbeing driven toa permanent dominantstate(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 transmitter isdisabled, drivingthe businto a recessive state. The timer is reset by a positive edge on TXD.

Table 1 Function table of the CAN transceiver (X = don’t care)

TXD S CANH CANL BUS STATE RXD

4.75 to 5.25 V 0 0 (or ﬂoating) HIGH LOW dominant 0

4.75 to 5.25 V X 1 0.5 × V

4.75 to 5.25 V 1 (or ﬂoating) X 0.5 × V

CC CC

<2 V (not powered) X X 0 V <CANH< V 2V<V

< 4.75 V >2 V X 0 V <CANH< V

CC CC

0.5 × V

0 V <CANL< V 0 V <CANL< V

recessive 1 recessive 1 recessive X

recessive X

1999 Sep 27 4

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 (pin 2). Positive currents ﬂow into the IC.

SYMBOL PARAMETER CONDITIONS MIN. MAX. UNIT

CANL

TXD

and V

ref

trt(CANH)

trt(CANL)

esd

stg

amb

, V

CANH

RXD

supply voltage −0.3 +5.25 V DC voltage at CANL and CANH 0 < VCC< 5.25 V;

−27 +40 V

no time limit

DC voltage at TXD, RXD, V

and S −0.3 VCC+ 0.3 V

ref

transient voltage at CANH and CANL time limit is 1 µs −55 +55 V

note 1 −200 +200 V electrostatic discharge at CANH; CANL note 3 −4+4kV electrostatic discharge at TXD; V

RXD; V

and S

ref

;

note 3 −2+2kV

electrostatic discharge at all pins note 4 −200 +200 V storage temperature −55 +150 °C operating ambient temperature −40 +125 °C junction temperature note 2 −40 +150 °C

Notes

1. The waveforms of the applied transients shall be in accordance with

“ISO 7637 part 1”

, test pulses 1, 2, 3a and 3b,

(see Fig.6).

2. In accordance with

“IEC 747-1”

. An alternative definition of Tjis: Tj=T

amb

+P×R

th(j-a)

, where R

is a fixed value

th(j-a)

to be used for the calculation of Tj. The rating for Tj limits the allowable combinations of power dissipation (P) and ambient temperature (T

amb

3. Human body model; C = 100 pF R = 1.5 kΩ.

4. Machine model; C = 200 pF R = 25 Ω.

THERMAL CHARACTERISTICS

According to IEC 747-1.

SYMBOL PARAMETER CONDITIONS VALUE UNIT

th(j-a)

thermal resistance from junction to

in free air 160 K/W ambient; TJA1050T(SO8)

QUALITY SPECIFICATION

Quality specification

“SNW-FQ-611 part D”

is applicable.

1999 Sep 27 5

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