TLE9251VLE datasheet(13/30 Pages) INFINEON

13 / 30 page

Data Sheet

Rev. 1.0

2017-08-09

HS CAN Transceiver

High Speed CAN Transceiver

Changing the mode of operation

6.3

Mode changes by VCC undervoltage

When the transmitter supply VCC (VCC < VCC(U/F)) is in undervoltage condition, the TLE9251V might not be able to

provide the correct bus levels on the CANH and CANL output pins. To avoid any interference with the network

the TLE9251V blocks the transmitter and changes the mode of operation when an undervoltage event is

detected (see Figure 8 and Figure 9).

In Normal-operating mode an undervoltage event on transmitter supply VCC (VCC < VCC(U/F)) triggers a mode

change to Forced-receive-only mode.

In Forced-receive-only mode the undervoltage detection VCC (VCC < VCC(U/F)) is enabled. In Stand-by mode the

undervoltage detection is disabled. In these modes the TLE9251V can operate without the transmitter supply

VCC.

Figure 8

Mode changes by undervoltage events on VCC

Figure 9

Undervoltage on the transmitter supply VCC

STB

VCC

VIO

power-down

state

“X”

“off”

Normal-operating

mode

STB

VCC

VIO

“on”

Forced-

Receive-only

mode

STB

VCC

VIO

“off”

“on”

Stand-by

mode

STB

VCC

VIO

“X”

“on”

VIO “on”

VCC “off”

STB “0”

VIO “on”

VCC “on”

STB “0”

Forced-receive only mode

Normal-operating mode

STB

digital supply voltage VIO = “on”

tDelay(UV)

VCC

hysteresis

VCC(UV,H)

VCC undervoltage monitor

VCC(UV,F)

VCC undervoltage monitor

VCC(UV,R)

tDelay(UV)

Assuming the STB remains “low”, for example the STB pin is

connected to GND.

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