Philips TJA1050 User Manual

INTEGRATED CIRCUITS

DATA SH EET

TJA1050

High speed CAN transceiver

Product speciﬁcation Supersedes data of 2002 May 16

2003 Oct 22

Philips Semiconductors Product speciﬁcation

High speed CAN transceiver TJA1050

FEATURES

• Fully compatible with the

“ISO 11898”

standard

• High speed (up to 1 Mbaud)

• Very low ElectroMagnetic Emission (EME)

• Differential receiver with wide common-mode range for

high ElectroMagnetic Immunity (EMI)

• An unpowered node does not disturb the bus lines

• Transmit Data (TXD) dominant time-out function

• Silent mode in which the transmitter is disabled

• Bus pins protected against transients in an automotive

environment

• Input levels compatible with 3.3 V and 5 V devices

• Thermally protected

• Short-circuit proof to battery and to ground

• At least 110 nodes can be connected.

GENERAL DESCRIPTION

The TJA1050 isthe interface between the Controller Area Network (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 third Philips high-speed CAN transceiver after the PCA82C250 and the PCA82C251. The most important differences are:

• Much lower electromagnetic emission due to optimal matching of the output signals CANH and CANL

• Improved behaviour in case of an unpowered node

• No standby mode.

This makes the TJA1050 eminently suitable for use in nodes that are in a power-down situation in partially powered networks.

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 pin CANH 0 < VCC< 5.25 V; no time limit −27 +40 V DC voltage at pin CANL 0 < VCC< 5.25 V; no time limit −27 +40 V differential bus input voltage dominant 1.5 3 V propagation delay TXD to RXD VS= 0 V; see Fig.7 − 250 ns virtual junction temperature −40 +150 °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; die dimensions 1700 × 1280 × 380 µm −

2003 Oct 22 2

Philips Semiconductors Product speciﬁcation

High speed CAN transceiver TJA1050

BLOCK DIAGRAM

handbook, full pagewidth

TXD

RXD

ref

0.5V

GND

25 kΩ

MGS374

CANH

CANL

30 µA

200

µA

GND

TXD

DOMINANT

TIME-OUT

TIMER

REFERENCE

VOLTAGE

TEMPERATURE

PROTECTION

DRIVER

RECEIVER

TJA1050

Fig.1 Block diagram.

PINNING

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

or silent mode

handbook, halfpage

TXD

1 2

TJA1050T

RXD

MGS375

Fig.2 Pin configuration.

8 7 6 5

S CANHGND CANL V

ref

2003 Oct 22 3

Philips Semiconductors Product 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 applicationsusing baud rates from 60 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 supply voltage, although power dissipation increases during this fault condition.

A thermal protection circuit protects the IC from damage 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 pin TXD goes HIGH. The thermal protection circuit is particularly needed when a bus line short-circuits.

The pins CANH and CANL are protected from automotive electrical transients (according to

“ISO 7637”

; see Fig.4).

Control pin S allows two operating modes to be selected: high-speed mode or silent mode.

Thehigh-speed mode isthe normal operating modeand is selected by connecting pin S to ground. It is the default mode if pin S is not connected. However, to ensure EMI performance in applications using only the high-speed mode, it is recommended that pin S is connected to ground.

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 and can be used to prevent network communication from being blocked, due to a CAN controller which is out of control.

A ‘TXD dominant time-out’ timer circuit prevents the bus linesbeing driven to apermanentdominant state (blocking all network communication) if pin TXD is forced permanently LOW by a hardware and/or software application failure. The timer is triggered by a negative edge on pin TXD. If the duration of the LOW-level on pin TXDexceedsthe internal timer value, thetransmitteris disabled, driving the bus into a recessive state. The timer is reset by a positive edge on pin TXD.

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

4.75 V to 5.25 V LOW LOW (or

TXD S CANH CANL BUS STATE RXD

HIGH LOW dominant LOW

ﬂoating)

4.75 V to 5.25 V X HIGH 0.5V

4.75 V to 5.25 V HIGH (or

X 0.5V

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

< 4.75 V >2 V X 0 V < V

CANH<VCC CANH<VCC

CC CC

0.5V

0V<V 0V<V

CC CC

CANL<VCC CANL<VCC

recessive HIGH recessive HIGH

recessive X recessive X

2003 Oct 22 4

Philips Semiconductors Product speciﬁcation

High speed CAN transceiver TJA1050

LIMITING VALUES

In accordance with the Absolute Maximum Rating System (IEC 60134). All voltages are referenced to GND (pin 2). Positive currents ﬂow into the IC.

SYMBOL PARAMETER CONDITIONS MIN. MAX. UNIT

CANH

CANL

TXD

RXD

ref

trt(CANH)

trt(CANL)

esd

stg

supply voltage −0.3 +6 V DC voltage at pin CANH 0 < VCC< 5.25 V;

−27 +40 V

no time limit

DC voltage at pin CANL 0 < VCC< 5.25 V;

−27 +40 V

no time limit DC voltage at pin TXD −0.3 VCC+ 0.3 V DC voltage at pin RXD −0.3 VCC+ 0.3 V DC voltage at pin V

ref

−0.3 VCC+ 0.3 V DC voltage at pin S −0.3 VCC+ 0.3 V transient voltage at pin CANH note 1 −200 +200 V transient voltage at pin CANL note 1 −200 +200 V electrostatic discharge voltage at all pins note 2 −4000 +4000 V

note 3 −200 +200 V storage temperature −55 +150 °C virtual junction temperature note 4 −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.4).

2. Human body model: C = 100 pF and R = 1.5 kΩ.

3. Machine model: C = 200 pF, R = 10 Ω and L = 0.75 µH.

4. In accordance with

“IEC 60747-1”

. An alternative definition of Tvjis: Tvj=T

amb

+P×R

th(vj-a)

, where R

th(vj-a)

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

amb

THERMAL CHARACTERISTICS

According to IEC 60747-1.

SYMBOL PARAMETER CONDITIONS VALUE UNIT

th(vj-a)

thermal resistance from junction to

in free air 145 K/W ambient in SO8 package

th(vj-s)

thermal resistance from junction to

in free air 50 K/W substrate of bare die

QUALITY SPECIFICATION

Quality specification

“SNW-FQ-611 part D”

is applicable.

is a fixed

2003 Oct 22 5

Philips Semiconductors Product speciﬁcation

High speed CAN transceiver TJA1050

CHARACTERISTICS

VCC= 4.75 V to 5.25 V; Tvj= −40 °C to +150 °C; RL=60Ω unless speciﬁed otherwise; all voltages are referenced to GND (pin 2); positive currents ﬂow into the IC; see notes 1 and 2.

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

Supply (pin V

)

supply current dominant; V

Transmitter data input (pin TXD)

HIGH-level input voltage output recessive 2.0 − VCC+ 0.3 V LOW-level input voltage output dominant −0.3 − +0.8 V HIGH-level input current V LOW-level input current V input capacitance not tested − 510pF

Mode select input (pin S)

HIGH-level input voltage silent mode 2.0 − VCC+ 0.3 V LOW-level input voltage high-speed mode −0.3 − +0.8 V HIGH-level input current VS= 2 V 20 30 50 µA LOW-level input current VS=0.8V 153045µA

Receiver data output (pin RXD)

HIGH-level output current V LOW-level output current V

Reference voltage output (pin V

ref

reference output voltage −50 µA<I

Bus lines (pins CANH and CANL)

o(reces)(CANH)

recessive bus voltage at pin CANH

o(reces)(CANL)

recessive bus voltage at pin CANL

o(reces)(CANH)

recessive output current at pin CANH

o(reces)(CANL)

recessive output current at pin CANL

o(dom)(CANH)

dominant output voltage at pin CANH

o(dom)(CANL)

dominant output voltage at pin CANL

i(dif)(bus)

differential bus input voltage (V

CANH

− V

CANL

)

ref

=0V255075mA

TXD

recessive; V

TXD=VCC TXD

RXD RXD

TXD=VCC

=0V −100 −200 −300 µA

= 0.7V

= 0.45 V 2 8.5 20 mA

2.5 5 10 mA

−50 +5µA

−2 −6 −15 mA

)

TXD=VCC

−27V<V

< +50 µA 0.45V

Vref

; no load 2.0 2.5 3.0 V

CANH

< +32 V;

−2.0 − +2.5 mA

0.5V

0.55V

0V<VCC< 5.25 V

−27V<V

CANL

< +32 V;

−2.0 − +2.5 mA

0V<VCC< 5.25 V V

= 0 V 3.0 3.6 4.25 V

TXD

= 0 V 0.5 1.4 1.75 V

TXD

= 0 V; dominant;

TXD

1.5 2.25 3.0 V

42.5 Ω <RL<60Ω V

TXD=VCC

; recessive;

−50 0 +50 mV

no load

2003 Oct 22 6

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