TLE9221SX Datasheet, PDF (40/91 Pages) Infineon Technologies AG – FlexRay Transceiver

TLE9221SX
Power Supply Interface
V
uV_BAT
uBDUV_BAT
uBDUVV_CC
uV_CC
uV_IO
uBDPD_BAT
dBD_PowerUp
BD_Off
powering up the
Central State Machine
Interim_BD_Standby
Host Interface blocked
t
BD_Standby
Host Interface released
Figure 30 Power-up
8.4.3 Interim BD_Standby Mode
As a safety measure, the TLE9221SX provides an Interim BD_Standby mode. Changeover to the
Interim_BD_Standby mode takes place during an incomplete power-up procedure (see Figure 31).
In Interim_BD_Standby mode, the TLE9221SX provides the same functions as in BD_Standby mode, except for
the host commands. The host commands are blocked in Interim BD_Standby mode. Therefore, a host command
cannot be used to change the mode of the TLE9221SX, while the power-up has not completed. With switching
over to the interim BD_Standby mode, at least one undervoltage detection timer is started. In case the power-up
is completed before the undervoltage detection timer expires, the TLE9221SX changes the mode of operation to
BD_Standby mode. In case the undervoltage detection timer expires before the power-up is completed, the
undervoltage flag is set depending on which power supply is missing, and the mode of operation changes to low
power mode (compare with Chapter 9.3).
Data Sheet
40
Rev. 1.10, 2013-07-15