TLE9263-3QX Datasheet, PDF (127/198 Pages) Infineon Technologies AG – Dedicated Data Sheets are available for the different product variants

TLE9263-3QX
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 over temperature
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 over temperature 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 over temperature 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 over temperature 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 over temperature 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 over temperature 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 over temperature 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.
Data Sheet
127
Rev. 1.1, 2014-09-26