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Apalis Carrier Board Design Guide
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Page | 65
Abbr. Name
Description
Module
Carrier Board
UPG
Unplugged
No power is applied to the
system, except the RTC battery
which might be available.
No main VCC and AVCC
applied. Maybe VCC_BACKUP is
available.
No power supply input. RTC
battery maybe inserted.
OFF
Off
System is off but the carrier
board input supply is available.
The main VCC is available, but
the CPU and peripherals are not
running. Only the PMIC is
running.
Carrier board provides power for
module and the peripheral
supplies are not available
SUS
Suspend
System is suspended and waits
for wakeup sources to trigger.
CPU is suspended. Wakeup
capable peripherals are running
while others might be switched
off.
Power rails are available on
carrier board whereas
peripherals may have been
stopped by the software.
RUN
Running
System is running.
All power rails are available. CPU
and peripherals are running.
All power rails are available and
peripherals are running.
RST
Reset
System is put in reset state by
holding RESET_MICO# low.
All power rails are available. CPU
and peripherals are in reset
state.
All power rails are available.
Peripherals are in the reset state.
Table 41: Available Apalis power states
The following figure shows a sequence diagram for the different power states. The module
automatically enters into the running mode when the main power rail is applied to the module. In
the running mode, the system can be set to a suspend state by the software. There might be
different wake up sources available. Consult the datasheet for a specific Apalis module for more
information about the available wakeup events. All Apalis modules support module wakeup using
the signal WAKE1_MICO#. If compatibility between different Apalis modules is needed, use this
pin as general wake signal.
In the running state, a shutdown request can be triggered by the software. This turns off all power
rails on the module and requests the carrier board to switch of the power rails for the peripherals.
The module can be brought back to the running mode in two ways. The module main voltage rail
(VCC) need to be removed and applied again. If needed, this could also be done with a button and
a small circuit. While the method of removing the main voltage works with all the modules, the
second method is dependent on the Apalis module. Some modules allow to being switched on
again by putting the RESET_MICO# signal to low (e.g. by pressing the reset button). Consult the
relevant datasheet for more information about the available methods to turn the module back on.
Figure 56: Power states and transitions
OFF
UPG
SUS
RUN
A
p
p
ly
V
C
C
to
M
o
d
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Wake event
Suspend request
Shut down request
R
em
o
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V
C
C
fr
o
m
M
o
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le
Rem
ove
VC
C
fro
m M
odu
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Re
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VC
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M
od
ule
RESET_MICO#