TLE9221SX Datasheet, PDF (36/91 Pages) Infineon Technologies AG – FlexRay Transceiver

TLE9221SX
Power Supply Interface
Interface are blocked as long as the uV_BAT undervoltage flag remains active (compare also with Chapter 9.3 and
Table 14).
ERRN
dReactionTime_ERRN
t
uV_BAT
set uV_BAT undervoltage bit
set error bit
dBDUVV_{BAT_BLK}
uBDUVV_BAT (Threshold)
dBDUVV_{BAT_Hys}
t < dBDUVV_{BAT_BLK}
dBDUVV_BAT
set uV_BAT undervoltage flag,
block host commands
non-low power mode
t
dBDRV_BAT
clear uV_BAT undervoltage flag,
release host commands
(return to the mode of operation
selected by the host command)
BD_Sleep
Figure 26 Undervoltage event at uV_BAT in non-low power mode
8.3.3
Undervoltage Event at uV_CC
Power supply voltage fluctuations on the uV_CC power supply, falling below the threshold uBDUVV_CC for a time
longer than the blanking time dBDUVV_{CC_BLK}, are considered as undervoltage events. Voltage fluctuations on
uV_CC shorter than the time dBDUV_{CC_BLK} are ignored and not recognized by the Power Supply Interface.
Detecting an undervoltage event on uV_CC, the FlexRay transceiver TLE9221SX sets the uV_CC undervoltage bit
(bit 9) and the error bit (bit 11) (see Figure 27). After the uV_CC undervoltage detection timer dBDUVV_CC expires,
the uV_CC undervoltage flag is set, the mode of operation changes to BD_Standby mode.
The Host Interface remains active while the uV_CC undervoltage detection timer is running and the reference supply
uV_IO is present. Setting the uV_CC undervoltage flag blocks the Host Interface and forces the mode of operation to
BD_Standby mode (compare also with Chapter 9.3 and Table 14).
While the power supply uV_CC is in undervoltage condition, the TLE9221SX also disables the Transmitter and sets
the bus error bit (bit 4).
Data Sheet
36
Rev. 1.10, 2013-07-15