TLE9221SX Datasheet, PDF (38/91 Pages) Infineon Technologies AG – FlexRay Transceiver

TLE9221SX
t
ERRN
uV_IO
set all output pins “low”
set all input pins to default
block all host commands
dReactionTime_ERRN
set uV_IO undervoltage bit
set error bit
Power Supply Interface
t
uUV_IO (Threshold)
uUV_{IO_Hys}
t < dBDUVV_{IO_BLK}
dBDUVV_{IO_BLK}
W
G%'59,2
dBD_ModeChange
dBDUVV_IO
set uV_IO undervoltage flag
clear uV_IO undervoltage flag,
release host commands
(return to the mode of operation
selected by the host command)
QRQORZSRZHUPRGH
%'B6WDQGE\
%'B6OHHS
Figure 28 Undervoltage event at uV_IO in non-low power mode
Note: While the TLE9221SX is in undervoltage condition at the reference supply uV_IO, all digital outputs are set to
“low”. The outputs do not reflect the status of the transceiver anymore.
For example, wake-up events cannot be indicated at the ERRN, RxD, and RxEN output anymore, since
these outputs are set permanently to “low”.
8.4
Power-up and Power-down
8.4.1 BD_Off State
According to the FlexRay Electrical Physical Layer Specification, version 3.0.1, BD_Off state is reached, when the
transceiver does not receive any supply.
The transceiver TLE9221SX is in BD_Off state when the internal supply voltage uV_IN is turned off and the Central
State Machine is powered down. When both power supplies, uV_CC and uV_BAT fall below their power-down
thresholds (uBDPDV_BAT and uBDPDV_CC), the internal supply is off and the BD_Off state is reached (see
Figure 29).
The status of the reference supply uV_IO has no influence on the power-down sequence of the Flexray transceiver
TLE9221SX.
When the FlexRay transceiver TLE9221SX is in BD_Off state, all outputs are logical “low”, the Transmitter and the
Receiver are turned off and the wake-up functions are not operational. If the reference supply uV_IO is available,
the inputs are set to their default values (compare with Table 2).
Data Sheet
38
Rev. 1.10, 2013-07-15