Philips TJA1040 User Manual

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TJA1040

High speed CAN transceiver

Product specification
Supersedes data of 2003 Feb 19

2003 Oct 14

Philips Semiconductors Product specification

High speed CAN transceiver TJA1040

FEATURES

• Fully compatible with the ISO 11898 standard

• High speed (up to 1 MBaud)

• Very low-current standby mode with remote wake-up

capability via the bus

• Very low ElectroMagnetic Emission (EME)

• Differential receiver with high common-mode range for

ElectroMagnetic Immunity (EMI)

• Transceiver in unpowered state disengages from the
bus (zero load)

• Input levels compatible with 3.3 V and 5 V devices

• Voltage source for stabilizing the recessive bus level if

split termination is used (further improvement of EME)

• At least 110 nodes can be connected

• Transmit Data (TXD) dominant time-out function

• Bus pins protected against transients in automotive

environments

• Buspinsandpin SPLIT short-circuitproofto batteryand
ground

• Thermally protected.

GENERAL DESCRIPTION

The TJA1040 isthe interface between theController Area
Network (CAN) protocol controller and the physical bus.
It is primarily intended for high speed applications, up to
1 MBaud, in passenger cars. The device provides
differential transmit capability to the bus and differential
receive capability to the CAN controller.

The TJA1040 is the next step up from the TJA1050 high
speed CANtransceiver. Beingpin compatible andoffering
the same excellent EMC performance, the TJA1040 also
features:

• An ideal passive behaviour when supply voltage is off

• A very low-current standby mode with remote wake-up

capability via the bus.

This makes the TJA1040 an excellent choice in nodes
which can be in power-down or standby mode in partially
powered networks.

QUICK REFERENCE DATA

SYMBOL PARAMETER CONDITIONS MIN. MAX. UNIT

V

CC

I

CC

V

CANH

V

CANL

V

SPLIT

V

esd

supply voltage operating range 4.75 5.25 V
supply current standby mode 5 15 µA
DC voltage on pin CANH 0 < VCC< 5.25 V; no time limit −27 +40 V
DC voltage on pin CANL 0 < VCC< 5.25 V; no time limit −27 +40 V
DC voltage on pin SPLIT 0 < VCC< 5.25 V; no time limit −27 +40 V
electrostatic discharge voltage Human Body Model (HBM)

pins CANH, CANL and SPLIT −6+6kV
all other pins −4+4kV

t

PD(TXD-RXD)

T

vj

propagation delay TXD to RXD V
virtual junction temperature −40 +150 °C

= 0 V 40 255 ns

STB

ORDERING INFORMATION

TYPE

NUMBER

NAME DESCRIPTION VERSION

PACKAGE

TJA1040T SO8 plastic small outline package; 8 leads; body width 3.9 mm SOT96-1
TJA1040U − bare die; die dimensions 1840 × 1440 × 380 µm −

2003 Oct 14 2

Philips Semiconductors Product specification

High speed CAN transceiver TJA1040

BLOCK DIAGRAM

handbook, full pagewidth

TXD

STB

RXD

GND

1

V

CC

8

4

2

TIME-OUT &

SLOPE

WAKE-UP

MODE CONTROL

MUX

TJA1040

TEMPERATURE

PROTECTION

DRIVER

WAKE-UP

FILTER

Fig.1 Block diagram.

V

CC

3

MGU161

5

SPLIT

7

CANH

6

CANL

V SPLIT

PINNING

SYMBOL PIN DESCRIPTION

TXD 1 transmit data input
GND 2 ground supply
V

CC

3 supply voltage

RXD 4 receive data output; reads out data

from the bus lines
SPLIT 5 common-mode stabilization output
CANL 6 LOW-level CAN bus line
CANH 7 HIGH-level CAN bus line
STB 8 standby mode control input

2003 Oct 14 3

handbook, halfpage

TXD

GND

V

CC

RXD

1
2
3
4

TJA1040T

8
7
6
5

MGU160

Fig.2 Pin configuration.

STB
CANH
CANL
SPLIT

Philips Semiconductors Product specification

High speed CAN transceiver TJA1040

FUNCTIONAL DESCRIPTION
Operating modes

The TJA1040 provides two modes of operation which are
selectablevia pin STB.See Table 1for adescriptionof the
modes of operation.

Table 1 Operating modes

MODE

PIN

STB

LOW HIGH

PIN RXD

normal LOW bus dominant bus recessive
standby HIGH wake-uprequest

detected

no wake-up
request detected

NORMAL MODE
In thismode thetransceiver is ableto transmitand receive

data via the bus lines CANH andCANL. See Fig.1 for the
block diagram. The differential receiver converts the
analog data on the bus lines into digital data which is
output to pin RXD viathe multiplexer (MUX). The slope of
the output signals on the bus lines is fixed and optimized
in a way that lowest ElectroMagnetic Emission (EME) is
guaranteed.

STANDBY MODE
In this modethe transmitter and receiver are switched off,

and thelow-power differentialreceiver will monitorthe bus
lines. A HIGH level on pin STB activates this low-power
receiver and the wake-up filter, and after t

the state of

BUS

the CAN bus is reflected on pin RXD.
The supply current on VCC is reduced to a minimum in

such a way that ElectroMagnetic Immunity (EMI) is
guaranteed and a wake-up event on the bus lines will be
recognized.

In this mode the bus lines are terminated to ground to
reduce the supply current (ICC) to a minimum. A diode is
added inseries withthe high-side driverof RXDto prevent
areverse currentfrom RXDto VCCinthe unpoweredstate.
In normal mode this diode is bypassed. This diode is not
bypassed instandby modeto reducecurrent consumption.

Split circuit

Pin SPLIT providesa DC stabilizedvoltage of 0.5VCC.Itis
turnedon onlyinnormal mode.Instandby modepin SPLIT
is floating. The V

circuit can be used to stabilize the

SPLIT

recessivecommon-mode voltagebyconnecting pin SPLIT

tothe centretap ofthe splittermination (seeFig.4). Incase
of arecessive bus voltage<0.5VCCdue tothe presence of
an unsupplied transceiverin the network witha significant
leakage current from the bus lines to ground, the split
circuit will stabilize this recessive voltage to 0.5VCC. So a
start of transmission does not cause a step in the
common-mode signal which would lead to poor
ElectroMagnetic Emission (EME) behaviour.

Wake-up

In the standby mode the bus lines are monitored via a
low-power differential comparator. Once the low-power
differential comparator has detecteda dominant bus level
for more than t

, pin RXD will become LOW.

BUS

Over-temperature detection

The outputdrivers areprotected againstover-temperature
conditions. If the virtual junction temperature exceeds the
shutdownjunction temperatureT

,the outputdriverswill

j(sd)

be disableduntil the virtualjunction temperature becomes
lower than T

and TXD becomes recessive again.

j(sd)

By including the TXD condition, the occurrence of output
driver oscillation due to temperature drifts is avoided.

TXD dominant time-out function

A ‘TXD dominant time-out’ timer circuit prevents the bus
lines from being driven to a permanent dominant 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 TXD exceeds the
internal timer value (t

), the transmitter is disabled,

dom

driving the bus lines into a recessive state. The timer is
reset by a positive edge on pin TXD. The TXD dominant
time-out timet

defines theminimum possible bitrate of

dom

40 kBaud.

Fail-safe features

Pin TXD providesa pull-uptowards VCCin orderto forcea
recessive level in case pin TXD is unsupplied.

Pin STB provides a pull-up towards VCC in order to force
the transceiver into standby mode in case pin STB is
unsupplied.

In the event that the VCC is lost, pins TXD, STB and RXD
will become floating to prevent reverse supplying
conditions via these pins.

2003 Oct 14 4

Philips Semiconductors Product specification

High speed CAN transceiver TJA1040

LIMITING VALUES

In accordance with the Absolute Maximum Rating System (IEC 60134).

SYMBOL PARAMETER CONDITIONS MIN. MAX. UNIT

V

CC

V

TXD

V

RXD

V

STB

V

CANH

V

CANL

V

SPLIT

V

trt

V

esd

T

vj

T

stg

supply voltage no time limit −0.3 +6 V

operating range 4.75 5.25 V
DC voltage on pin TXD −0.3 VCC+ 0.3 V
DC voltage on pin RXD −0.3 VCC+ 0.3 V
DC voltage on pins STB −0.3 VCC+ 0.3 V
DC voltage on pin CANH 0 < VCC< 5.25 V; no time limit −27 +40 V
DC voltage on pin CANL 0 < VCC< 5.25 V; no time limit −27 +40 V
DC voltage on pin SPLIT 0 < VCC< 5.25 V; no time limit −27 +40 V
transient voltages on pins CANH,

according to ISO 7637; see Fig.5 −200 +200 V
CANL and SPLIT

electrostatic discharge voltage Human Body Model (HBM); note 1

pins CANH and CANL

−6+6kV

and SPLIT
all other pins −4+4kV

Machine Model (MM); note 2 −200 +200 V
virtual junction temperature note 3 −40 +150 °C
storage temperature −55 +150 °C

Notes

1. Equivalent to discharging a 100 pF capacitor via a 1.5 kΩ series resistor.

2. Equivalent to discharging a 200 pF capacitor via a 0.75 µH series inductor and a 10 Ω series resistor.

3. Junction temperature in accordance with IEC 60747-1. An alternative definition of Tvjis: Tvj=T
where R

th(vj-amb)

combinations of power dissipation (P) and ambient temperature (T

is a fixed value to be used for the calculating of Tvj. The rating for Tvj limits the allowable

).

amb

amb

+P×R

THERMAL CHARACTERISTICS

In accordance with IEC 60747-1.

SYMBOL PARAMETER CONDITIONS VALUE UNIT

R

th(vj-a)

thermal resistance from virtual junction

in free air 145 K/W

to ambient in SO8 package

R

th(vj-s)

thermal resistance from virtual junction

in free air 50 K/W

to substrate of bare die

QUALITY SPECIFICATION

Quality specification in accordance with

“AEC-Q100”

.

th(vj-amb)

,

2003 Oct 14 5

Philips Semiconductors Product specification

High speed CAN transceiver TJA1040

CHARACTERISTICS

VCC= 4.75 to 5.25 V, Tvj= −40 to +150 °C and RL=60Ω unless specified otherwise; all voltages are defined with
respect to ground; positive currents flow into the IC; note 1.

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

Supply (pin V

I

CC

)

CC

supply current standby mode 5 10 15 µA

normal mode

recessive; V
dominant; V

Transmit data input (pin TXD)

V

IH

V

IL

I

IH

I

IL

C

i

HIGH-level input voltage 2 − VCC+ 0.3 V
LOW-level input voltage −0.3 − +0.8 V
HIGH-level input current V

TXD=VCC

LOW-level input current normal mode; V
input capacitance not tested − 510pF

Standby mode control input (pin STB)

V

IH

V

IL

I

IH

I

IL

HIGH-level input voltage 2 − VCC+ 0.3 V
LOW-level input voltage −0.3 − +0.8 V
HIGH-level input current V
LOW-level input current V

STB=VCC

=0V −1 −4 −10 µA

STB

Receive data output (pin RXD)

V

OH

I

OH

I

OL

HIGH-level output voltage standby mode;

I

= −100 µA

RXD

HIGH-level output current normal mode;

V

RXD=VCC

LOW-level output current V

= 0.4 V 2 6 12 mA

RXD

Common-mode stabilization output (pin SPLIT)

V

O

output voltage normal mode;

−500 µA<IO< +500 µA

I

 leakage current standby mode;

L

−22V<V

Bus lines (pins CANH and CANL)

V

O(dom)

dominant output voltage V

TXD

=0V
pin CANH 3 3.6 4.25 V
pin CANL 0.5 1.4 1.75 V

V

O(dom)(m)

V

O(dif)(bus)

matching of dominant output
voltage (VCC-V

CANH-VCANL

differential bus output voltage
(V

CANH

− V

CANL

)

)

V

= 0 V; dominant;

TXD

45 Ω <RL<65Ω
V

TXD=VCC

no load

TXD=VCC

TXD

TXD

− 0.4 V

< +35 V

SPLIT

; recessive;

2.5 5 10 mA

=0V305070mA

−50 +5µA

=0V −100 −200 −300 µA

− 0 −µA

VCC− 1.1 VCC− 0.7 VCC− 0.4 V

−0.1 −0.4 −1mA

0.3V

CC

0.5V

CC

0.7V

CC

V

− 05µA

−100 0 +150 mV

1.5 − 3.0 V

−50 − +50 mV

2003 Oct 14 6