User Manual
48
Rev. 1.1
2019-03-18
TLE984xQX
Microcontroller with LIN and Power Switches for Automotive Applications
Power Management Unit (PMU)
6.4
Power Control Unit
The Power Control Unit is the controlling instance of the system power supply generation (PSG). It offers
important fail safe features, which are described in the next chapter.
6.4.1
Power Control Unit - Fail Safe Scenarios
The PMU handles several different failure scenarios, listed below and described in the following chapters:
• Fail safe mode (Sleep Mode) in case of power failure.
• Fail safe mode (Sleep Mode) in case of watchdog service failure.
• Fail safe mode (Sleep Mode) in case of overcurrent on voltage regulators VDDP or VDDC.
• 2 level monitoring (prewarning and reset) of voltage regulators output voltages (VDDP, VDDC, VDDEXT).
• Wake-up from Stop Mode with cyclic sense in case of VDDEXT regulator failures.
• Wake-up from Stop Mode in case of hardware reset on RESET pin.
6.4.1.1
Power Supervision Function of PCU
The power supervision feature of the PCU is mainly responsible for monitoring the voltage regulators VDDP
and VDDC. In case of voltage regulator malfunction, the PCU restarts the voltage regulators (VDDP and VDDC).
Each time this happens the error counter “error_supp” is incremented. If the counter reaches the value 5, the
VDDEXT_FAIL_EN
2
rw
Enabling of VDDEXT Supply status information as
interrupt source
0
B
VDDEXT fail interrupts are disabled
1
B
VDDEXT fail Interrupts are enabled
VDDEXT_CYC_EN
1
rw
VDDEXT Supply for Cyclic Sense Enable
Note:
To use VDDEXT Supply for cyclic sense the
bits VDDEXT_CYC_EN AND VDDEXT_ENABLE
must be set
0
B
VDDEXT for cyclic sense disable
1
B
VDDEXT for cyclic sense enable
VDDEXT_ENABLE
0
rw
VDDEXT Supply Enable
0
B
VDDEXT Supply disabled
1
B
VDDEXT supply enabled
Table 10 RESET
Register Reset Type
Reset Values
Reset Short Name
Reset Mode
Note
RESET_TYPE_3
00000000
H
RESET_TYPE_3
ResetMask=
“0xFFFFFFEF”;
RESET_TYPE_0
00000000
H
RESET_TYPE_0
ResetMask=
“0x00000010”;
Field
Bits
Type
Description