TJA1054AT/S400,518 datasheet, PDF

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TJA1054AT/S400,518: DescriptionIC DATACOM, INTERFACE CIRCUIT, PDSO14, 3.90 MM, PLASTIC, SOT-108-1, MS-012, SO-14, Network Interface; CategoryWireless rf/communication Telecom circuit; File Size143KB，26 Pages; ManufacturerNXP; Websitehttps://www.nxp.com

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TJA1054AT/S400,518 Overview

IC DATACOM, INTERFACE CIRCUIT, PDSO14, 3.90 MM, PLASTIC, SOT-108-1, MS-012, SO-14, Network Interface

TJA1054AT/S400,518 Parametric

Parameter Name	Attribute value
Parts packaging code	SOIC
package instruction	SOP,
Contacts	14
Reach Compliance Code	unknow
JESD-30 code	R-PDSO-G14
JESD-609 code	e4
length	8.65 mm
Number of functions	1
Number of terminals	14
Package body material	PLASTIC/EPOXY
encapsulated code	SOP
Package shape	RECTANGULAR
Package form	SMALL OUTLINE
Certification status	Not Qualified
Maximum seat height	1.75 mm
Nominal supply voltage	5 V
surface mount	YES
Telecom integrated circuit types	INTERFACE CIRCUIT
Terminal surface	NICKEL PALLADIUM GOLD
Terminal form	GULL WING
Terminal pitch	1.27 mm
Terminal location	DUAL
width	3.9 mm
Base Number Matches	1

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TJA1054A

Fault-tolerant CAN transceiver

Rev. 04 — 2 January 2007

Product data sheet

1. General description

The TJA1054A is the interface between the protocol controller and the physical bus wires

in a Controller Area Network (CAN). It is primarily intended for low-speed applications up

to 125 kBd in passenger cars. The device provides differential receive and transmit

capability but will switch to single-wire transmitter and/or receiver in error conditions.

The TJA1054A is the ElectroStatic Discharge (ESD) improved version of the TJA1054.

The TJA1054AT is, as the TJA1054T, pin and downwards compatible with the

PCA82C252T and the TJA1053T. This means that these two devices can be replaced by

the TJA1054AT or the TJA1054T with retention of all functions.

The most important improvements of the TJA1054 and the TJA1054A with respect to the

PCA82C252 and the TJA1053 are:

•

Very low ElectroMagnetic Emission (EME) due to a very good matching of the CANL

and CANH output signals

•

Good ElectroMagnetic Emission (EMI), especially in low power modes

Full wake-up capability during bus failures

Extended bus failure management including short-circuit of the CANH bus line to V

Support for easy system fault diagnosis

Two-edge sensitive wake-up input signal via pin WAKE

2. Features

2.1 Optimized for in-car low-speed communication

Baud rate up to 125 kBd

Up to 32 nodes can be connected

Supports unshielded bus wires

Very low ElectroMagnetic Emission (EME) due to built-in slope control function and a

very good matching of the CANL and CANH bus outputs

Good ElectroMagnetic Immunity (EMI) in normal operating mode and in low power

modes

Fully integrated receiver ﬁlters

Transmit Data (TxD) dominant time-out function

2.2 Bus failure management

Supports single-wire transmission modes with ground offset voltages up to 1.5 V

NXP Semiconductors

TJA1054A

Fault-tolerant CAN transceiver

7. Functional description

The TJA1054A is the interface between the CAN protocol controller and the physical wires

of the CAN bus (see

Figure 7).

It is primarily intended for low-speed applications, up to

125 kBd, in passenger cars. The device provides differential transmit capability to the

CAN bus and differential receive capability to the CAN controller.

To reduce EME, the rise and fall slopes are limited. This allows the use of an unshielded

twisted pair or a parallel pair of wires for the bus lines. Moreover, the device supports

transmission capability on either bus line if one of the wires is corrupted. The failure

detection logic automatically selects a suitable transmission mode.

In normal operating mode (no wiring failures) the differential receiver is output on pin RXD

(see

Figure 1).

The differential receiver inputs are connected to pins CANH and CANL

through integrated ﬁlters. The ﬁltered input signals are also used for the single-wire

receivers. The receivers connected to pins CANH and CANL have threshold voltages that

ensure a maximum noise margin in single-wire mode.

A timer function (TxD dominant time-out function) has been integrated to prevent the bus

lines from being driven into a permanent dominant state (thus blocking the entire network

communication) due to a situation in which pin TXD is permanently forced to a LOW level,

caused by a hardware and/or software application failure.

If the duration of the LOW level on pin TXD exceeds a certain time, the transmitter will be

disabled. The timer will be reset by a HIGH level on pin TXD.

7.1 Failure detector

The failure detector is fully active in the normal operating mode. After the detection of a

single bus failure the detector switches to the appropriate mode (see

Table 4).

The

differential receiver threshold voltage is set at

−3.2

V typical (V

= 5 V). This ensures

correct reception with a noise margin as high as possible in the normal operating mode

and in the event of failures 1, 2, 5 and 6a. These failures, or recovery from them, do not

destroy ongoing transmissions. The output drivers remain active, the termination does not

change and the receiver remains in differential mode (see

Table 4).

Failures 3, 3a and 6 are detected by comparators connected to the CANH and CANL bus

lines. Failures 3 and 3a are detected in a two-step approach. If the CANH bus line

exceeds a certain voltage level, the differential comparator signals a continuous dominant

condition. Because of inter operability reasons with the predecessor products

PCA82C252 and TJA1053, after a ﬁrst time-out the transceiver switches to single-wire

operation through CANH. If the CANH bus line is still exceeding the CANH detection

voltage for a second time-out, the TJA1054A switches to CANL operation; the CANH

driver is switched off and the RTH bias changes to the pull-down current source. The

time-outs (delays) are needed to avoid false triggering by external RF ﬁelds.

TJA1054A_4

Product data sheet

Rev. 04 — 2 January 2007

5 of 26

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