Datasheet

Data Sheet 22 Rev. 1.1, 2011-06-06
TLE6251-3G
Fail Safe Features
7.3.2 Under-Voltage Event on V
S
If an under-voltage event is detected at the power supply V
S
, the TLE6251-3G immediately transfers into the
Stand-By mode, regardless of the operation mode in which the TLE6251-3G might currently operate. After the
power supply
V
S
has been reestablished, the operation mode can be changed by applying a logical “High” signal
to the EN pin or the NSTB pin.
In the case the TLE6251-3G detects an under-voltage event on the
V
CC
or V
IO
power supply, the TLE6251-3G
changes to Sleep mode. If the TLE6251-3G detects in Sleep mode an under-voltage event on the
V
S
power supply,
the device changes to the Stand-By mode, even if the under-voltage event on the
V
CC
or V
IO
power supply is still
present.
Figure 13 Under-Voltage on
V
S
7.4 Voltage Adaptation
The advantage of the adaptive microcontroller logic is the ratio metrical scaling of the I/O levels depending on the
input voltage at the
V
IO
pin. Connecting the V
IO
input to the I/O supply of the microcontroller ensures, that the I/O
voltage of the microcontroller fits to the internal logic levels of the TLE6251-3G.
t
V
S
any mode
V
S,Poff
V
S,Pon
Power Down Stand-By mode