Embedian, Inc.
149
SMARC-iMX8MM Computer on Module User’s Manual
v. 1.2
Module
and
Carrier
power
supplies
(other
than
Module
and
Carrier
power
supervisory
circuits)
will
not
be
enabled
while
this
signal
is
held
low
by
the
Carrier.
This
signal
has
a
100K
pull
‐
up
on
module
and
is
driven
by
OD
part
on
Carrier.
4.1.8.
System
Power
Domains
It
is
useful
to
describe
an
SMARC
system
as
being
divided
into
a
hierarchy
of
three
power
domains:
1) Battery
Charger
power
domain
(can
be
neglected
if
the
system
is
not
battery
powered
only)
2)
SMARC
Module
power
domain
3) Carrier
Circuits
power
domain
The
Battery
Charger
domain
includes
circuits
that
are
active
whenever
either
charger
input
power
and
/
or
battery
power
are
available.
These
circuits
may
include
power
supply
supervisor(s),
battery
chargers,
fuel
gauges
and,
depending
on
the
battery
configuration,
switching
power
section(s)
to
step
down
a
high
incoming
battery
voltage.
The
SMARC
Module
domain
includes
the
SMARC
module.
The
Carrier
Circuits
domain
includes
“everything
else”
(and
does
not
include
items
from
the
Battery
Charger
and
Module
domain,
even
though
they
may
be
mounted
on
the
Carrier).
This
is
illustrated
in
the
figure
below.