Recessive

Dominant

Recessive

Time, t

Low Power

Standby Mode

CANL

CANH

V

diff

V

diff

Normal & Silent Mode

RXD

V /2

CC

A

B

A: Normal Mode

B: Low Power Standby Mode

CANH

CANL

SN65HVDA540-Q1, SN65HVDA541-Q1, SN65HVDA542-Q1

SN65HVDA540-5-Q1, SN65HVDA541-5-Q1, SN65HVDA542-5-Q1

www.ti.com

SLLS804C – MARCH 2009 – REVISED JANUARY 2013

FUNCTIONAL DESCRIPTION

Generaral Description

The device meets or exceeds the specifications of the ISO 11898 High Speed CAN (Controller Area Network)

Physical Layer standard (transceiver). This device provides CAN transceiver functions: differential transmit

capability to the bus and differential receive capability at data rates up to 1 megabit per second (Mbps). The

device includes many protection features providing device and CAN network robustness.

Operating Modes

The device has two main operating modes: normal mode (all devices) and standby mode (SN65HVDA540 / 541)

or silent mode (SN65HVDA542). Operating mode selection is made via the STB (SN65HVDA540 / 541) or the S

(SN65HVDA542) input pin.

Table 1. Operating Modes

DEVICE

STB / S

MODE

DRIVER

RECEIVER

RXD Pin

All Devices

LOW

Normal Mode

Enabled (On)

Enabled (On)

SN65HVDA540

HIGH

Standby Mode (No Wake Up)

Disabled (Off)

Disabled (Off)

Recessive (HIGH)

Low power wake-up

Standby Mode (RXD Wake Up

Mirrors bus state via wake-

SN65HVDA541

HIGH

Disabled (Off)

receiver and bus monitor

Request)

enabled

SN65HVDA542

HIGH

Silent Mode

Disabled (Off)

Enabled (On)

(1)

Mirrors bus state: LOW if CAN bus is dominant, HIGH if CAN bus is recessive.

(2)

See Figure 3 and Figure 4 for operation of the low power wake up receiver and bus monitor for RXD Wake Up Request behavior and

Table 3 for the wake up receiver threshold levels.

Bus States by Mode

The CAN bus has three valid states during powered operation depending on the mode of the device. In normal

mode the bus may be dominant (logic LOW) where the bus lines are driven differentially apart or recessive (logic

third state is low power standby mode where the bus lines will be biased to GND via the high-ohmic internal input

Figure 1. Bus States (Physical Bit Representation)

Figure 2. Simplified Common Mode Bias and

Receiver Implementation

Normal Mode

This is the normal operating mode of the device. It is selected by setting STB or S low. The CAN driver and

receiver are fully operational and CAN communication is bi-directional. The driver is translating a digital input on

TXD to a differential output on CANH and CANL. The receiver is translating the differential signal from CANH

and CANL to a digital output on RXD. In recessive state the CAN bus pins (CANH and CANL) are biased to 0.5

bus and logic low is equivalent to a dominant (differential) signal on the bus.

Copyright © 2009–2013, Texas Instruments Incorporated

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Product Folder Links: SN65HVDA540-Q1 SN65HVDA541-Q1 SN65HVDA540-5-Q1 SN65HVDA541-5-Q1

SN65HVDA542-5-Q1