Data Sheet
118
Rev. 1.00
2017-07-31
TLE9263BQXV33
Supervision Functions
15.9
Thermal Protection
Three independent and different thermal protection features are implemented in the SBC according to the
system impact:
•
Individual thermal shutdown of specific blocks
•
Temperature prewarning of main microcontroller supply VCC1
•
SBC thermal shutdown due to VCC1 overtemperature
15.9.1
Individual Thermal Shutdown
As a first-level protection measure the output stages VCC2, CAN, LINx, and HSx are independently switched
OFF if the respective block reaches the temperature threshold T
jTSD1
. Then the
TSD1
bit is set. This bit can only
be cleared via SPI once the overtemperature is not present anymore. Independent of the SBC Mode the
thermal shutdown protection is only active if the respective block is ON.
The respective modules behave as follows:
•
VCC2: Is switched to OFF and the control bits
VCC2_ON
are cleared. The status bit
VCC2_OT
is set. Once the
overtemperature condition is not present anymore, then VCC2 has to be configured again by SPI.
•
VCC3 as a stand-alone regulator: Is switched to OFF and the control bits
VCC3_ON
are cleared. The status
bit
VCC3_OT
is set. Once the overtemperature condition is not present anymore VCC3 has to be configured
again by SPI. It is recommended to clear the
VCC3_OT
bit before enabling the regulator again.
•
VCC3 in load sharing configuration: in case of overtemperature at VCC3 the bit
VCC3_OT
is set and VCC3 is
switched off. The regulator will be switched on again automatically once the overtemperature event is not
present anymore. Also in this case it is recommended to clear the
VCC3_OT
bit right away.
• CAN: The transmitter is disabled and stays in CAN Normal Mode acting like CAN Receive only mode. The
status bits
CAN_FAIL
= ‘01’ are set. Once the overtemperature condition is not present anymore, then the
CAN transmitter is automatically switched on.
•
LINx: The transmitter is disabled and stays in LIN Normal Mode acting like LIN Receive only mode. The status
bits
LIN1_FAIL
and
LIN2_FAIL
respectively are set to ‘01’. Once the overtemperature condition is not present
anymore, then the LIN transmitter is automatically switched on.
• HSx: If one or more HSx switches reach the TSD1 threshold, then all HSx switches are turned OFF and the
control bits for HSx are cleared (see registers
HS_CTRL1
and
HS_CTRL2
). The status bits HSx_OC_OT are
set (see register
HS_OC_OT_STAT
). Once the overtemperature condition is not present anymore, then HSx
has to be configured again by SPI.
Note:
The diagnosis bits are not cleared automatically and have to be cleared via SPI once the
overtemperature condition is not present anymore.
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