User Manual
31
Rev. 1.1
2019-03-18
TLE984xQX
Microcontroller with LIN and Power Switches for Automotive Applications
Power Management Unit (PMU)
6.2.2
PMU Modes Overview
The following state diagram shows the available modes of the device.
Figure 5
Power Management Unit System Modes
Active Mode
In Active Mode the Power Management Unit releases the reset of the embedded MCU and the application
software takes control of the system. Now the PMU is responsible for supplying and supervising the embedded
system. The supervision functionality of the PMU monitors the output voltage/current of the generated
supplies and the status information of the system watchdog (WDT1).
Under normal operating conditions (exceptions see Chapter
Power Control Unit - Fail Safe Scenarios
) the
power save modes are set by the user software only. The PMU gets the respective command and after a certain
delay the corresponding ready signal will follow. The user software has to write the command to the power
mode control register (PMCON0) of the SCU. As a consequence the SCU sends the MCU in data retention mode
and accepts this with the respective ready signal.
start-up
active
stop
sleep
Stop
command
(from MCU)
LIN-wake or
MON-wake or
GPIO-wake or
cyclic _wake or
PMU_PIN = 1 or
SUP_TMOUT = 1
VDDC =stable and
error_supp<5
error_sup=5
PMU_System _Modes _Cus_w_Stopp .vsd
V
S
> 4V and V
S
ramp up
or
V
S
< 3V and V
S
ramp down
LIN-wake or
MON-wake or
cyclic -wake
VDDC / VDDP = fail
(short circuit )
erro+
Sleep command (from MCU ) or
WDT1_SEQ_FAIL = 1 (
error_wdt = 5) or
VDDC / VDDP = overload
PMU_PIN = 1 or
PMU_SOFT = 1 or
(PMU_Ext_WDT = 1 and
WDT1_SEQ_FAIL = 0
err+)
cyclic sense
cyclic sense