TLE9221SX Datasheet, PDF (25/91 Pages) Infineon Technologies AG – FlexRay Transceiver

TLE9221SX
Wake-up Detector
is connected to the WAKE input. Conversely, while a voltage uV_WAKE < uBDWake_Thr is applied to the WAKE input,
the internal pull-down structure is activated (see Figure 15).
iBDWake
iBDWake_L
uBDWake_Thr(min.)
pull-down current
uBDWake_Thr(max.)
uV_BAT
uBDWake
iBDWake_H
uBDWake_Hys
Figure 15 Pull-up and pull-down at the WAKE input
7.1.1 Local Wake-up Falling Edge
pull-up current
WAKE
dBDWakePulseFilter
dBDWakeupReaction_local
100% uV_BAT
uBDWake_Thr
t
wake-up detection
set local wake-up bit
RxD
RxEN
BD_Sleep
t
BD_Standby
Figure 16 Local wake-up falling edge
The TLE9221SX detects a falling edge (signal change from uV_BAT to GND) at the WAKE pin, followed by a “low”
signal for the time period dBDWakePulseFilter as a local wake-up event (see Figure 16). The implemented filter
time dBDWakePulseFilter avoids that spikes at the WAKE signal are considered as valid wake-up events.
In BD_Sleep mode, BD_Standby mode and during the BD_GoToSleep command the state machine of the
TLE9221SX sets the local wake-up bit (bit 0) in the SIR (active logical “low”), when detecting a local wake-up
event. In non-low power modes, the detection of a local wake-up event is ignored and no status bit is set. Together
with the local wake-up bit, the TLE9221SX also sets the wake-up flag (active logical “low”). The wake-up source
bit (bit 12) remains at logical “high”, when a local wake-up event is detected.
Data Sheet
25
Rev. 1.10, 2013-07-15