TLE6251G_08 Datasheet, PDF (11/32 Pages) Infineon Technologies AG – High Speed CAN-Transceiver with Wake Detection

TLE 6251 G
Standby Mode
In the standby mode, transmission and reception of signals is deactivated. This is the first step of
reducing the current consumption. The internal voltage regulator control pin (INH) is still active,
so all external (INH controlled) powered devices are also activated.
Wake-Up
The wake-up is possible via WK-pin (filtering time t > t_WK) or CAN message (filtering time t >
t_WU) and sets the RxD/NERR pins to LOW, see Figure 4. Now the µC is able to detect this change
at RxD and switch the transceiver into the normal mode. Once the wake-up flag is set (= LOW),
it remains in this state, as long as the transceiver is not transferred into the normal mode. The
detection of the wake-up source is possible during the first 4 recessive to dominant edges at TxD
in the normal mode.
Go-to Sleep Mode
The go-to sleep mode is used to have an intermediate step between the sleep mode and all other
modes. This mode has to control if the sleep command (EN = 1, NSTB = 0) is activated for a
minimum hold time t > t_hSLP. Afterwards the TLE 6251 G automatically transfers into the sleep
mode. The activated features in go-to sleep mode are similar to the standby mode.
Sleep Mode
In the sleep mode, transmission and reception of signals is deactivated. This is the second step of
reducing the current consumption. The internal voltage regulator control pin (INH) is deactivated.
Transition into other Modes during Sleep Mode
Transition from sleep into other modes is possible if V_CC and V_µC active. Selection of the modes
can be done by the mode control inputs.
Wake-Up
The wake-up is possible via WK-pin (filtering time t > t_WK) or CAN message (filtering time t >
t_WU) and automatically transfers the TLE 6251 G into the standby mode and sets the RxD/NERR
pins to LOW, see Figure 4. Once the TLE 6251 G has been set to the standby mode, the system
voltage regulator is activated by the inhibit output INH, and the µC restarts. Now the µC is able
to detect this change at RxD and switch the transceiver into the normal mode. Once the wake-up
flag is set (= LOW), it remains in this state, as long as the transceiver is not transferred into the
normal mode. The detection of the wake-up source is possible during the first 4 recessive to
dominant edges at TxD in the normal mode.
Final Data Sheet
11
Rev. 3.3, 2008-06-19