User Manual
246
Rev. 1.1
2019-03-18
TLE984xQX
Microcontroller with LIN and Power Switches for Automotive Applications
System Control Unit - Power Modules (SCU-PM)
Figure 41 Function
of
AP_SUB_CTRL
If the device will power up the analog modules statemachine will startup all analog modules. First of all, the
reference voltage will be enabled. After that the biasing module will be enabled. If this step is completed the
analog modules will be enabled step by step. After this is done the measurement interface will start-up.
When leaving Stop Mode, this sequence restores the SFR register contents with the values written before
entering Stop Mode.
The Sleep and Stop Mode entry is as well controlled by this state machine. This ensures a smooth shutdown
of the modules avoiding disturbances (like load jumps) on the supplies.
The power control unit also handles system failures indicated by the analog measurement interface. They are:
System failures handled by SCU_PM:
• automatic shutdown of power modules in case of System Overtemperature
• automatic shutdown of power modules in case of loss of clock
• automatic shutdown of system in case of System Overtemperature
• automatic shutdown of system in case of internal supply fail
• automatic shutdown of LIN module in case of VS Undervoltage
How to configure this actions on the above described system failures will be described in the following
chapters.
8.5.1
Overtemperature System Shutdown
In case of overtemperature (T
j
> 150 °C) the system will be set to Sleep Mode. This functionality is used to
protect the system from thermal overstress. One possibility of avoiding this thermal shutdown is to stick to an
Working Principle of PCU
PCU
Analog Peripheral Control
SFR
&
0
0
0
&
0
0
0
PD_N
ON
PD_N
ON
to analog
module
to analog
module