PAC5223
Power Application Controller
Figure 10-5. Linear Regulators
VP
V
V
(15V typical)
P
PAC5223
& V
(5V)
CCIO
REGO
VSYS
SYS
4.7µF
(1)
VCCIO
VCC33
VCC18
VSS
VSSA
1µF
1µF
(1) 5V I/O connection shown.
Connect instead to a 4.7µF
capacitor for 3.3V I/O.
10.3.3. Power Up Sequence
The MMPM follows a typical power up sequence as in the Figure 10-6 below. A typical sequence begins with input power
supply being applied, followed by the safe start up and start up durations to bring the switching supply output VP to 15V,
before the linear regulators are enabled. When all the supplies are ready, the internal clocks become available, and the
microcontroller starts executing from the program memory. During initialization, the microcontroller can reconfigure the
switching supply to a different VP regulation voltage such as 15V and to an appropriate switching frequency and switching
mode. The total loading on the switching supply must be kept below 25% of the maximum output current until after the
reconfiguration of the switching supply is complete. For AC input supply applications, the start up sequence includes an
additional charging time for VHM depending on the start-up resistor and capacitor values.
Figure 10-6. Power Up Sequence
Power-on-
reset delay
Regulators
enabled
Reconfiguration by firmware
Safe start up
Start up
6ms
System operation
SOC.PWRCFG.TRESET + 10.5 ms
(default: 32ms + 10.5ms = 42.5ms)
V
or V
HM
IN
7.4V
V
V
V
V
V
or V
HM
IN
V
(5V/9V/12V/15V)
P
V
(start up default)
P
4.3V
P
V
and V
V
(5V)
CCIO
SYS
4V
and V
SYS
CC33
CC18
CCIO
(3.3V)
(1.8V)
CC33
V
CC18
87%
Internal clocks
Power on reset
Microcontroller
reset
Microcontroller
executing
Microcontroller
initializing
10.3.4. Hibernate Mode
The IC can go into an ultra-low power hibernate mode via the microcontroller firmware or via the optional push button
(PBTN, see Push Button description in Configurable Analog Front End). In hibernate mode, only a minimal amount
(typically 18µA) of current is used by VHM, and the MMSS controller and all internal regulators are shut down to eliminate
power drain from the output supplies. The system exits hibernate mode after a wake-up timer duration (configurable from
- 23 -
Rev 1.17‒September 20, 2017
ACTIVE-SEMI [ ACTIVE-SEMI, INC ]
