tle8261-2e Infineon Technologies Corporation, tle8261-2e Datasheet - Page 43
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tle8261-2e
Manufacturer Part Number
tle8261-2e
Description
Universal System Basis Chip Hermes
Manufacturer
Infineon Technologies Corporation
Datasheet
1.TLE8261-2E.pdf
(83 pages)
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10
10.1
10.1.1
The reset output pin RO provides information to the microcontroller, for example, in the event that the output
voltage has fallen below the undervoltage threshold
reset signal remains LOW initially. When the output voltage
output RO remains LOW for the reset delay time
due to faulty Watchdog refresh.See
adjusted via SPI. The RO pin has an integrated pull-up resistor.
10.1.2
The RO pin is diagnosed for both short circuit to
failure, the SBC goes to SBC Fail-Safe or Restart Mode and activate the Limp Home output.
In case of short circuit to GND, it is detected in any SBC mode except SBC Restart Mode. At the falling edge of
the RO, when supposed to be HIGH, the SBC enters automatically the SBC Restart Mode. If after the
relaxation, the RO pin is still LOW, then the SBC detects the clamping to LOW failure. The microcontroller is in
permanent reset.
In case of short circuit to
clamped is detected when the SBC goes to SBC Restart Mode or during Init Mode.
10.1.3
Figure 18
Data Sheet
V
SPI
RO
CC
V
RTx
Supervision Functions
Reset Function
Description
Reset diagnosis
Reset Timing
Reset Timing Diagram
SBC Init
t
RD1
V
SPI
Init
ccx
, the SBC cannot detect the short circuit before a reset should occur. So reset
t
LW
t
Chapter
CW
Trigger
WD
10.2. The reset threshold as well as the reset delay time can be
t
SBC Normal
OW
t
rd1
V
. After that the RO is released to HIGH. A reset can also occur
ccx
t < t
t
CW
V
and GND. Depending on the configuration, in case of RO
Trigger
43
RT1/2/3
RR
WD
V
cc1µC
. When connecting the SBC to battery voltage, the
t
OW
t
has reached the reset threshold
RR
undervoltage
SBC Restart
t
RDx
Supervision Functions
Rev. 1.0, 2009-05-26
SPI
Init
t
LW
SBC Normal
TLE8261-2E
V
RT1,r
Res_per_8264.vsd
t
, the reset
rd
t
CW
and RO
t
t
t
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