TLE7250V_15 Datasheet, PDF (28/34 Pages) Infineon Technologies AG – High Speed CAN-Transceiver

TLE7250VLE
TLE7250VSJ
Application Information
8.3
Examples for Mode Changes
Changing the status on the NEN input pin triggers a change of the operating mode, disregarding the actual signal
on the CANH, CANL and TxD pins (see also Chapter 4.2).
Mode changes are triggered by the NEN pin, when the device TLE7250V is fully supplied. Setting the NEN pin to
logical “low” changes the mode of operation to normal-operating mode:
• The mode change is executed independently of the signal on the HS CAN bus. The CANH, CANL inputs may
be either “dominant” or “recessive”. They can be also permanently shorted to GND or V_CC.
• A mode change is performed independently of the signal on the TxD input. The TxD input may be either logical
“high” or “low”.
Analog to that, changing the NEN input pin to logical “high” changes the mode of operation to the power-save
mode independent on the signals at the CANH, CANL and TxD pins.
Note: In case the TxD signal is “low” setting the NEN input pin to logical “low” changes the operating mode of the
device to normal-operating mode and drives a “dominant” signal to the HS CAN bus.
Note: The TxD time-out is only effective in normal-operating mode. The TxD time-out timer starts when the
TLE7250V enters normal-operating mode and the TxD input is set to logical “low”.
Data Sheet
28
Rev. 1.0, 2015-08-12