TJA1051T-E データシートの表示（PDF） - Philips Electronics

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TJA1051T-E

High-speed CAN transceiver

Philips Electronics 

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]

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

[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.

Pin RXD

active[2]

active[2]

active[2]

floating

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

Product data sheet

All information provided in this document is subject to legal disclaimers.

Rev. 6 — 25 March 2011

© NXP B.V. 2011. All rights reserved.

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