TLE9251VLE datasheet(12/30 Pages) INFINEON

12 / 30 page

Data Sheet

Rev. 1.0

2017-08-09

HS CAN Transceiver

High Speed CAN Transceiver

Changing the mode of operation

6.2

Mode change by the STB pin

When the TLE9251V is supplied with the digital voltage VIO the internal logic works and mode change by the

mode selection pin STB is possible.

By default the STB input pin is logical “high” due to the internal pull-up current source to VIO. Changing the STB

input pin to logical “low” in Stand-by mode triggers a mode change to Normal-operating mode (see Figure 7).

To enter Normal-operating mode the transmitter supply VCC needs to be available.

Stand-by mode can be entered from Normal-operating mode and Forced-receive-only mode by setting the

STB pin to logical “high”. While changing the mode of operation from Normal-operating mode or Forced-

receive-only mode to Stand-by mode, the transceiver TLE9251V turns off the transmitter and switches from

the normal-mode receiver to the low-power receiver. Entering Forced-receive-only mode from Stand-by

mode is not possible by the STB pin. The device remains in Stand-by mode independently of the VCC supply

voltage.

Figure 7

Mode selection by the STB pin

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”

STB “1”

VIO “on”

STB “1”

VIO “on”

VCC “on”

STB “0”

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