TLE6251-2G_11 Datasheet, PDF (33/36 Pages) Infineon Technologies AG – High Speed CAN-Transceiver with Wake and Failure Detection

TLE6251-2G
Application Information
11.4
Mode Change to Sleep mode
Mode changes are applied either by a host command, an Wake-Up event or by an under-voltage event. To trigger
a mode change by a host command or in other words by a signal change on the digital input pins EN and NSTB
all power supplies, V_S V_IO and V_CC need to be available.TLE6251-2G.
By setting the EN pin to logical “High” and the NSTB pin to logical “Low”, the TLE6251-2G enters the Go-To-Sleep
command and after the time t = t_hSLP expires, the TLE6251-2G enters into the Sleep mode (see Chapter 5.5). For
any mode change, also for a mode change to Sleep mode the TLE6251-2G disregards the signal on the CAN bus.
Therefore the TLE6251-2G can enter Sleep mode and remain in Sleep mode even if there is a short circuit on the
CAN bus, for example CANH shorted to V_S or V_CC.
In order to recognize a remote Wake-Up, the TLE6251-2G requires a signal change from “Recessive” to
“Dominant” before the Wake-Up filter time starts (see Figure 6 and Figure 18).
EN
t = t_hSLP
t
NSTB
Normal
Operation mode
Go-To Sleep
command
CANH
CANL
Sleep mode
t = t_Wake
no Wake-Up
INH
t
Stand-By mode
t = t_Wake
„Recessive“ to „Dominant“
change
Wake-Up
t
t
RxD
t
Figure 18 Mode change to Sleep while the CANH bus is “Dominant”
11.5
Further Application Information
• Please contact us for information regarding the FMEA.
• Existing App. Note
• For further information you may contact http://www.infineon.com/transceiver
Data Sheet
33
Rev. 1.1, 2011-06-06