TJA1051 Datasheet PDF - NXP Semiconductors
| Part Number | TJA1051 | |
| Description | High-speed CANtransceiver | |
| Manufacturers | NXP Semiconductors | |
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TJA1051
High-speed CAN transceiver
Rev. 7 — 15 January 2015
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 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
The TJA1051 implements the CAN physical layer as defined in the current ISO11898
standard (ISO11898-2:2003). Pending the release of the updated version of ISO11898-2
including CAN FD, additional timing parameters defining loop delay symmetry are
specified. This implementation enables reliable communication in the CAN FD fast phase
at data rates up to 2 Mbit/s.
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 11898-2:2003 compliant
Loop delay symmetry timing enables reliable communication at data rates up to
2 Mbit/s in the CAN FD fast phase
Suitable for 12 V and 24 V systems
Low ElectroMagnetic Emission (EME) and high ElectroMagnetic Immunity (EMI)
VIO 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
Available in SO8 package or leadless HVSON8 package (3.0 mm 3.0 mm) with
improved Automated Optical Inspection (AOI) capability
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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 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]
Operating modes
Inputs
Pin EN[1]
Pin S
HIGH
LOW
HIGH
LOW
HIGH
HIGH
LOW
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
[1] Only available on the TJA1051T/E.
[2] LOW if the CAN bus is dominant, HIGH if the CAN bus is recessive.
[3] ‘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 slopes of the output signals on the bus lines are
controlled internally and are 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
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 7 — 15 January 2015
© NXP N.V. 2015. All rights reserved.
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