TLE9250XLE datasheet(13/29 Pages) INFINEON

13 / 29 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 TLE9250X 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 TLE9250X 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 and in Receive-only mode a undervoltage event on 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 this mode the

TLE9250X can operate without the transmitter supply VCC.

Due to the internal pull-down current source at RM input pin the transceiver changes the mode of operation

from Forced-receive-only mode to Normal-operating mode if VCC is supplied again and no external signal is

applied to the RM input pin.

Figure 8

Mode changes by undervoltage events on VCC

VCC

VIO

Power-down

state

“X”

“off”

Normal-operating

mode

VCC

VIO

“on”

Forced-

Receive-only

mode

VCC

VIO

“X”

“off”

“on”

Receive-only

mode

VCC

VIO

“on”

VIO “on”

VCC “off”

RM “0”

VIO “on”

VCC “on”

RM “0”

VIO “on”

VCC “off”

RM “1”

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