STB

RXD

Bus V

Diff

Standby Mode, STB = High

<t

Clear

<t

BUS

t

BUS

t

BUS

t

Clear

t

BUS

t

BUS

STB

Bus V

Diff

RXD

Standby Mode, STB = High

<t

BUS

<t

BUS

<t

BUS

t

BUS

t

BUS

SN65HVDA540-Q1, SN65HVDA541-Q1, SN65HVDA542-Q1

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

SLLS804C – MARCH 2009 – REVISED JANUARY 2013

www.ti.com

Standby Mode (SN65HVDA540)

This is the low power mode of the device. It is selected by setting STB high. The CAN driver and receiver are

turned off and bi-directional CAN communication is not possible. There is no wake up capability in the

SN65HVDA540, the RXD pin will remain recessive (high) while the device is in standby mode. This state is

system level. The local protocol controller (MCU) should reactivate the device to normal mode to enable

resume normal mode if it has been turned off for low-power standby operation. The CAN bus pins are weakly

pulled to GND, see Figure 1 and Figure 2.

Standby Mode with RXD Wake Up-Request (SN65HVDA541)

This is the low power mode of the device. It is selected by setting STB high. The CAN driver and main receiver

are turned off and bi-directional CAN communication is not possible. The low power receiver and bus monitor,

supply may be turned off for additional power savings at the system level. A wake up request will be output to

(MCU) should monitor RXD for transitions and then reactivate the device to normal mode based on the wake up

has been turned off for low-power standby operation. The CAN bus pins are weakly pulled to GND, see Figure 1

and Figure 2.

RXD Wake Up Request Lock Out for Bus Stuck Dominant Fault (SN65HVDA541)

If the bus has a fault condition where it is stuck dominant while the SN65HVDA541 is placed into standby mode

via the STB pin, the device locks out the RXD wake up request until the fault has been removed to prevent false

wake up signals in the system.

Figure 3. SN65HVDA541 RXD Wake Up Request With No Bus Fault Condition

Figure 4. SN65HVDA541 RXD Wake Up Request Lock Out When Bus Dominant Fault Condition

Silent (Receive Only) Mode (SN65HVDA542)

This is the silent (receive only) mode of the device. It is selected by setting S high. The CAN driver is turned off

while the receiver remains active and RXD will output the received bus state. There is no low power mode in the

Device section of the datasheet).

4

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

SN65HVDA542-5-Q1