Data Sheet
24
Rev. 1.00
2017-07-31
TLE9262BQXV33
System Features
Figure 4
Hardware Configuration Selection Timing Diagram
There are four different device configurations (
Table 5
) available defining the watchdog failure and the VCC1
overvoltage behavior. The configurations can be selected via the external connection on the INT pin and the
SPI bit
CFG
in the
HW_CTRL
register (see also
Chapter 16.4
):
•
CFGP
= ‘1’: Config 1 and Config 3:
– A watchdog trigger failure leads to SBC Restart Mode and depending on
CFG
the Fail Outputs (FOx) are
activated after the 1st (Config 1) or 2nd (Config 3) watchdog trigger failure;
– A VCC1 overvoltage detection will lead to SBC Restart Mode if
VCC1_OV_RST
is set.
VCC1_ OV
will be set and the Fail Outputs are activated;
•
CFGP
= ‘0’: Config 2 and Config 4:
– A watchdog trigger failure leads to SBC Fail-Safe Mode and depending on
CFG
the Fail Outputs (FOx)
are activated after the 1st (Config 2) or 2nd (Config 4) watchdog trigger failure. The first watchdog
trigger failure in Config 4 will lead to SBC Restart Mode;
– A VCC1 overvoltage detection will lead to SBC Fail-Safe Mode if
VCC1_OV_RST
is set.
VCC1_ OV
will be set and the Fail Outputs are activated;
The respective device configuration can be identified by reading the SPI bit
CFG
in the
HW_CTRL
register and
the
CFGP
bit in the
WK_LVL_STAT
register.
Table 5
shows the configurations and the device behavior in case of a watchdog trigger failure:
Table 5
Watchdog Trigger Failure Configuration
Config INT Pin (
CFGP
) SPI Bit
CFG
Event
FOx Activation
SBC Mode Entry
1
External pull-up 1
1 x Watchdog Failure after 1st WD Failure
SBC Restart Mode
2
No ext. pull-up
1
1 x Watchdog Failure after 1st WD Failure
SBC Fail-Safe Mode
3
External pull-up 0
2 x Watchdog Failure after 2nd WD Failure
SBC Restart Mode
4
No ext. pull-up
0
2 x Watchdog Failure after 2nd WD Failure
SBC Fail-Safe Mode
t
VCC1
t
RO
t
VS
V
POR,r
t
RD1
V
RT1,r
t
CFG_F
Configuration selection monitoring period
Continuous Filtering with
