INTEGRATED CIRCUITS
DATA SHEET
TJA1050
High speed CAN transceiver
Product specification
Supersedes data of 2002 May 16
2003 Oct 22
Philips Semiconductors
Product specification
High speed CAN transceiver
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.
QUICK REFERENCE DATA
SYMBOL
V
CC
V
CANH
V
CANL
V
i(dif)(bus)
t
PD(TXD-RXD)
T
vj
PARAMETER
supply voltage
DC voltage at pin CANH
DC voltage at pin CANL
differential bus input voltage
propagation delay TXD to RXD
virtual junction temperature
0 < V
CC
< 5.25 V; no time limit
0 < V
CC
< 5.25 V; no time limit
dominant
V
S
= 0 V; see Fig.7
CONDITIONS
MIN.
4.75
−27
−27
1.5
−
−40
GENERAL DESCRIPTION
TJA1050
The TJA1050 is the 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.
MAX.
5.25
+40
+40
3
250
+150
UNIT
V
V
V
V
ns
°C
ORDERING INFORMATION
TYPE
NUMBER
TJA1050T
TJA1050U
PACKAGE
NAME
SO8
−
DESCRIPTION
plastic small outline package; 8 leads; body width 3.9 mm
bare die; die dimensions 1700
×
1280
×
380
µm
VERSION
SOT96-1
−
2003 Oct 22
2
Philips Semiconductors
Product specification
High speed CAN transceiver
BLOCK DIAGRAM
TJA1050
handbook, full pagewidth
VCC
3
30
µA
VCC
200
µA
GND
TEMPERATURE
PROTECTION
S
8
TXD
1
TXD
DOMINANT
TIME-OUT
TIMER
VCC
DRIVER
7
25
kΩ
0.5VCC
GND
6
CANH
RXD
4
RECEIVER
GND
5
REFERENCE
VOLTAGE
25
kΩ
CANL
Vref
TJA1050
2
MGS374
GND
Fig.1 Block diagram.
PINNING
SYMBOL
TXD
PIN
1
DESCRIPTION
transmit data input; reads in data
from the CAN controller to the bus
line drivers
ground
supply voltage
receive data output; reads out
data from the bus lines to the
CAN controller
reference voltage output
LOW-level CAN bus line
HIGH-level CAN bus line
select input for high-speed mode
or silent mode
Fig.2 Pin configuration.
handbook, halfpage
GND
V
CC
RXD
2
3
4
TXD 1
GND 2
8 S
7
CANH
CANL
Vref
TJA1050T
VCC
RXD
3
4
MGS375
6
5
V
ref
CANL
CANH
S
5
6
7
8
2003 Oct 22
3
Philips Semiconductors
Product specification
High speed CAN transceiver
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
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).
Table 1
TJA1050
Control pin S allows two operating modes to be selected:
high-speed mode or silent mode.
The 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 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 V
CC
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
lines 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, the transmitter is
disabled, driving the bus into a recessive state. The timer
is reset by a positive edge on pin TXD.
Function table of the CAN transceiver; X = don’t care
V
CC
TXD
LOW
X
HIGH (or
floating)
X
>2 V
S
LOW (or
floating)
HIGH
X
X
X
CANH
HIGH
0.5V
CC
0.5V
CC
0 V < V
CANH
< V
CC
0 V < V
CANH
< V
CC
CANL
LOW
0.5V
CC
0.5V
CC
0 V < V
CANL
< V
CC
0 V < V
CANL
< V
CC
BUS STATE
dominant
recessive
recessive
recessive
recessive
RXD
LOW
HIGH
HIGH
X
X
4.75 V to 5.25 V
4.75 V to 5.25 V
4.75 V to 5.25 V
<2 V (not powered)
2 V < V
CC
< 4.75 V
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
V
CC
V
CANH
V
CANL
V
TXD
V
RXD
V
ref
V
S
V
trt(CANH)
V
trt(CANL)
V
esd
T
stg
T
vj
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 T
vj
is: T
vj
= T
amb
+ P
×
R
th(vj-a)
, where R
th(vj-a)
is a fixed
value to be used for the calculation of T
vj
. The rating for T
vj
limits the allowable combinations of power dissipation (P)
and ambient temperature (T
amb
).
THERMAL CHARACTERISTICS
According to IEC 60747-1.
SYMBOL
R
th(vj-a)
R
th(vj-s)
PARAMETER
thermal resistance from junction to
ambient in SO8 package
thermal resistance from junction to
substrate of bare die
CONDITIONS
in free air
in free air
VALUE
145
50
UNIT
K/W
K/W
PARAMETER
supply voltage
DC voltage at pin CANH
DC voltage at pin CANL
DC voltage at pin TXD
DC voltage at pin RXD
DC voltage at pin V
ref
DC voltage at pin S
transient voltage at pin CANH
transient voltage at pin CANL
note 1
note 1
note 3
storage temperature
virtual junction temperature
note 4
0 < V
CC
< 5.25 V;
no time limit
0 < V
CC
< 5.25 V;
no time limit
CONDITIONS
MIN.
−0.3
−27
−27
−0.3
−0.3
−0.3
−0.3
−200
−200
−4000
−200
−55
−40
MAX.
+6
+40
+40
V
V
V
UNIT
V
CC
+ 0.3 V
V
CC
+ 0.3 V
V
CC
+ 0.3 V
V
CC
+ 0.3 V
+200
+200
+4000
+200
+150
+150
V
V
V
V
°C
°C
electrostatic discharge voltage at all pins note 2
QUALITY SPECIFICATION
Quality specification
“SNW-FQ-611 part D”
is applicable.
2003 Oct 22
5
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