User Manual
50
Rev. 1.1
2019-03-18
TLE984xQX
Microcontroller with LIN and Power Switches for Automotive Applications
Power Management Unit (PMU)
One fail safe measure to wake-up the embedded system from the Stop-Mode can be executed by hardware
reset. If there is a reset request on the reset-pin then the PMU goes to Active Mode. Simultaneously, the
embedded system gets a reset which is shown by forcing the bidirectional reset-pin. The reset-pin goes high
again if the PMU releases the MCU reset. This event is shown in the reset status register as a hard-reset
together with a wake-up reset. In case of a fail condition at one of the voltage regulators the PMU also goes to
Active Mode. After that the PMU starts the supply fail-safe procedure which is described in the Active Mode
section. The described sequence can be seen in the picture below.
Figure 17 Stop Mode Exit Timing with Reset
MON
SYSTEM_STATE
Stop
Active
LP_CLK
1.5V
VDDC
02
H
xx
H
PMU_RESET_STS
reduced voltage
RESET_PIN