TJA1051
High-speed CAN transceiver
Rev. 5 — 29 December 2010
Product data sheet
1. General description
The TJA1051 is a high-speed CAN transceiver that provides an interface between a
Controller Area Network (CAN) protocol controller and the physical two-wire CAN bus.
The transceiver is designed for high-speed (up to 1 Mbit/s) CAN applications in the
automotive industry, providing differential transmit and receive capability to (a
microcontroller with) a CAN protocol controller.
The TJA1051 belongs to the third generation of high-speed CAN transceivers from NXP
Semiconductors, offering significant improvements over first- and second-generation
devices such as the TJA1050. It offers improved ElectroMagnetic Compatibility (EMC)
and ElectroStatic Discharge (ESD) performance, and also features:
•
Ideal passive behavior to the CAN bus when the supply voltage is off
•
TJA1051T/3 and TJA1051TK/3 can be interfaced directly to microcontrollers with
supply voltages from 3 V to 5 V
These features make the TJA1051 an excellent choice for all types of HS-CAN networks,
in nodes that do not require a standby mode with wake-up capability via the bus.
2. Features and benefits
2.1 General
Fully ISO 11898-2 compliant
Suitable for 12 V and 24 V systems
Low ElectroMagnetic Emission (EME) and high ElectroMagnetic Immunity (EMI)
V
IO
input on TJA1051T/3 and TJA1051TK/3 allows for direct interfacing with 3 V to 5 V
microcontrollers (available in SO8 and very small HVSON8 packages respectively)
EN input on TJA1051T/E allows the microcontroller to switch the transceiver to a very
low-current Off mode
2.2 Low-power management
Functional behavior predictable under all supply conditions
Transceiver disengages from the bus when not powered up (zero load)
2.3 Protection
High ElectroStatic Discharge (ESD) handling capability on the bus pins
Bus pins protected against transients in automotive environments
Transmit Data (TXD) dominant time-out function
Undervoltage detection on pins V
CC
and V
IO
NXP Semiconductors
TJA1051
High-speed CAN transceiver
Thermally protected
3. Quick reference data
Table 1.
Symbol
V
CC
V
uvd(VCC)
I
CC
Quick reference data
Parameter
supply voltage
undervoltage detection
voltage on pin V
CC
supply current
Silent mode
Normal mode; bus
recessive
Normal mode; bus
dominant
V
ESD
V
CANH
V
CANL
T
vj
electrostatic discharge
voltage
voltage on pin CANH
voltage on pin CANL
virtual junction
temperature
IEC 61000-4-2 at pins
CANH and CANL
no time limit; DC
limiting value
no time limit; DC
limiting value
Conditions
Min
4.5
3.5
0.1
2.5
20
8
58
58
40
Typ
-
-
1
5
50
-
-
-
-
Max
5.5
4.5
2.5
10
70
+8
+58
+58
+150
Unit
V
V
mA
mA
mA
kV
V
V
C
4. Ordering information
Table 2.
Ordering information
Package
Name
TJA1051T
TJA1051T/3
[1]
TJA1051T/E
[1]
TJA1051TK/3
[1]
SO8
SO8
SO8
HVSON8
Description
plastic small outline package; 8 leads; body width 3.9 mm
plastic small outline package; 8 leads; body width 3.9 mm
plastic small outline package; 8 leads; body width 3.9 mm
plastic thermal enhanced very thin small outline package; no leads;
8 terminals; body 3
3
0.85 mm
Version
SOT96-1
SOT96-1
SOT96-1
SOT782-1
Type number
[1]
TJA1051T/3 and TJA1051TK/3 with V
IO
pin; TJA1051T/E with EN pin.
TJA1051
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2010. All rights reserved.
Product data sheet
Rev. 5 — 29 December 2010
2 of 21
NXP Semiconductors
TJA1051
High-speed CAN transceiver
5. Block diagram
V
IO(1)
5
V
CC
3
V
CC
TJA1051
TEMPERATURE
PROTECTION
V
I/O(1)
SLOPE
CONTROL
AND
DRIVER
7
CANH
TXD
1
TIME-OUT
6
CANL
S
8
MODE
CONTROL
EN
(2)
5
RXD
4
DRIVER
2
015aaa036
GND
(1) In a transceiver without a V
IO
pin, the V
IO
input is internally connected to V
CC
.
(2) Only present in the TJA1051T/E.
Fig 1.
Block diagram
TJA1051
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2010. All rights reserved.
Product data sheet
Rev. 5 — 29 December 2010
3 of 21
NXP Semiconductors
TJA1051
High-speed CAN transceiver
6. Pinning information
6.1 Pinning
TXD
GND
V
CC
RXD
1
2
8
7
S
CANH
CANL
n.c.
TXD
GND
V
CC
RXD
1
2
8
7
S
CANH
CANL
EN
TJA1051T
3
4
015aaa225
TJA1051T/E
3
4
015aaa223
6
5
6
5
a. TJA1051T: SO8
b. TJA1051T/E: SO8
terminal 1
index area
TXD
GND
1
2
8
7
S
CANH
CANL
V
IO
TXD
GND
V
CC
RXD
1
2
8
7
S
V
CC
3
4
CANH
CANL
V
IO
RXD
TJA1051TK/3
6
5
TJA1051T/3
3
4
015aaa224
6
5
015aaa222
Transparent top view
c. TJA1051T/3: SO8
Fig 2.
Pin configuration diagrams
d. TJA1051TK/3: HVSON8
6.2 Pin description
Table 3.
Symbol
TXD
GND
V
CC
RXD
n.c.
EN
V
IO
CANL
CANH
S
Pin description
Pin
1
2
3
4
5
5
5
6
7
8
Description
transmit data input
ground
supply voltage
receive data output; reads out data from the bus lines
not connected; in TJA1051T version
enable control input; TJA1051T/E only
supply voltage for I/O level adapter; TJA1051T/3 and TJA1051TK/3 only
LOW-level CAN bus line
HIGH-level CAN bus line
Silent mode control input
TJA1051
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2010. All rights reserved.
Product data sheet
Rev. 5 — 29 December 2010
4 of 21
NXP Semiconductors
TJA1051
High-speed CAN transceiver
7. Functional description
The TJA1051 is a high-speed CAN stand-alone transceiver with Silent mode. It combines
the functionality of the TJA1050 transceiver with improved EMC and ESD handling
capability. Improved slope control and high DC handling capability on the bus pins
provides additional application flexibility.
The TJA1051 is available in three versions, distinguished only by the function of pin 5:
•
The TJA1051T is 100 % backwards compatible with the TJA1050
•
The TJA1051T/3 and TJA1051TK/3 allow for direct interfacing to microcontrollers with
supply voltages down to 3 V
•
The TJA1051T/E allows the transceiver to be switched to a very low-current Off mode.
7.1 Operating modes
The TJA1051 supports two operating modes, Normal and Silent, which are selected via
pin S. An additional Off mode is supported in the TJA1051T/E via pin EN. See
Table 4
for
a description of the operating modes under normal supply conditions.
Table 4.
Mode
Normal
Silent
Off
[1]
[1]
[2]
[3]
Operating modes
Inputs
Pin EN
[1]
HIGH
HIGH
HIGH
LOW
Pin S
LOW
LOW
HIGH
X
[3]
Pin TXD
LOW
HIGH
X
[3]
X
[3]
Outputs
CAN driver
dominant
recessive
recessive
floating
Pin RXD
active
[2]
active
[2]
active
[2]
floating
Only available on the TJA1051T/E.
LOW if the CAN bus is dominant, HIGH if the CAN bus is recessive.
‘X’ = don’t care.
7.1.1 Normal mode
A LOW level on pin S selects Normal mode. In this mode, the transceiver is able to
transmit and receive data via the bus lines CANH and CANL (see
Figure 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. The slope of the output signals on the bus lines is
controlled and optimized in a way that guarantees the lowest possible ElectroMagnetic
Emission (EME).
7.1.2 Silent mode
A HIGH level on pin S selects Silent mode. In Silent mode the transmitter is disabled,
releasing the bus pins to recessive state. All other IC functions, including the receiver,
continue to operate as in Normal mode. Silent mode can be used to prevent a faulty CAN
controller from disrupting all network communications.
TJA1051
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2010. All rights reserved.
Product data sheet
Rev. 5 — 29 December 2010
5 of 21
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