TLE9250VLE datasheet(13/28 Pages) INFINEON

13 / 28 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 TLE9250V 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 TLE9250V 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 a 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 Power-save mode the

undervoltage detection is disabled. In these modes the TLE9250V can operate without the transmitter supply

VCC.

Figure 8

Mode changes by undervoltage events on VCC

Figure 9

Undervoltage on the transmitter supply VCC

NEN

VCC

VIO

Power-down

state

“X”

“off”

Normal-operating

mode

NEN

VCC

VIO

“on”

Forced-

receive-only

mode

NEN

VCC

VIO

“off”

“on”

Power-save

mode

NEN

VCC

VIO

“X”

“on”

VIO “on”

VCC “off”

NEN “0”

VIO “on”

VCC “on”

NEN “0”

Forced-receive-only mode

any mode of operation

VCC

hysteresis

VIO(UV,H)

Power-save mode

NEN

“X” = don’t care

“high” due the internal

pull-up resistor1)

1) assuming no external signal applied

VCC undervoltage monitor

VCC(UV,F)

VCC undervoltage monitor

VCC(UV,R)

tDelay(UV)

digital supply voltage VIO = “on”

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