User Manual
28
Rev. 1.1
2019-03-18
TLE984xQX
Microcontroller with LIN and Power Switches for Automotive Applications
Power Management Unit (PMU)
6
Power Management Unit (PMU)
6.1
Features
• System modes control (startup, sleep, stop and active)
• Power management (cyclic wake)
• Control of system voltage regulators with diagnosis (overload, short, overvoltage)
• Fail safe mode detection and operation in case of system errors (watchdog fail)
• Wake-up sources configuration and management (LIN, MON, GPIOs)
• System error logging
6.2
Introduction
The purpose of the power management unit is to ensure the fail safe behavior of the system IC. Therefore the
power management unit controls all system modes including the corresponding transitions. The power
management unit is responsible for generating all needed voltage supplies for the embedded MCU (VDDC,
VDDP) and the external supply (VDDEXT). Additionally, the PMU provides well defined sequences for the
system mode transitions and generates hierarchical reset priorities. The reset priorities control the reset
behavior of all system functionalities especially the reset behavior of the embedded MCU. All these functions
are controlled by finite state machines. The system master functionality of the PMU requires the generation of
an independent logic supply and system clock. Therefore the PMU has a module internal logic supply and
system clock which works independently of the MCU clock.