TJA1051高速CAN收发器数据手册.pdf_TJA1051T典型应用电路

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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 is a up from the TJA1050 high-speed CAN transceiver. 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

• Direct interfacing to microcontrollers with 3 V to 5 V supply voltages on TJA1051T/3

and TJA1051TK/3.

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

2.1 General

n Fully ISO 11898-2 compliant

n Suitable for 12 V and 24 V systems

n Low ElectroMagnetic Emission (EME) and high ElectroMagnetic Immunity (EMI)

n V

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)

2.2 Low-power management

n Functional behavior predictable under all supply conditions

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

2.3 Protection

n High ElectroStatic Discharge (ESD) handling capability on the bus pins

n Bus pins protected against transients in automotive environments

n Transmit Data (TXD) dominant time-out function

n Undervoltage detection on pins V

and V

n Thermally protected

TJA1051

High-speed CAN transceiver

Rev. 01 — 9 March 2009 Product data sheet

Product data sheet Rev. 01 — 9 March 2009 4 of 18

NXP Semiconductors

TJA1051

High-speed CAN transceiver

6. 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 two versions, distinguished only by the function of pin 5:

• The version with pin 5 open is 100 % backwards compatible with the TJA1050

• The version with a V

pin allows for direct interfacing to microcontrollers with supply

voltages down to 3 V

6.1 Operating modes

The TJA1051 supports two operating modes, Normal and Silent, which are selectable via

pin S. See Table 3 for a description of the operating modes under normal supply

conditions.

[1] LOW if the CAN bus is dominant, HIGH if the CAN bus is recessive.

[2] X = don't care

6.1.1 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).

6.1.2 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.

6.2 Fail-safe features

6.2.1 TXD dominant time-out function

A ‘TXD dominant time-out’ timer is started when pin TXD is set LOW. If the LOW state on

pin TXD persists for longer than t

to(dom)TXD

, the transmitter is disabled, releasing the bus

lines to recessive state. This function prevents a hardware and/or software application

Table 3. Operating modes

Mode Inputs Outputs

Pin S Pin TXD CAN driver Pin RXD

Normal LOW LOW dominant active

[1]

LOW HIGH recessive active

[1]

Silent HIGH X

[2]

recessive active

[1]

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