TLE7250_15 Datasheet, PDF (27/34 Pages) Infineon Technologies AG – High Speed CAN-Transceiver

TLE7250LE
TLE7250SJ
Application Information
8.3
Examples for Mode Changes
Changing the status on the NRM or 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 NRM pin and NEN pin, when the device TLE7250 is fully supplied. Setting the
NEN pin to logical “low” and the NRM pin to logical “high” 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. Changing the NEN input pin and the NRM input pin to logical “low” changes the mode of operation to the
receive-only mode. Both mode changes are independent on the signals at the CANH, CANL and TxD pins.
Note: In case the TxD signal is “low” setting the NRM input pin to logical “high” and the NEN input pin to logical
“low” changes 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
TLE7250 enters normal-operating mode and the TxD input is set to logical “low”.
Data Sheet
27
Rev. 1.0, 2015-08-12