Embedian, Inc.
108
SMARC-iMX8MM Computer on Module User’s Manual
v. 1.2
2.4.5.
MTBF
The
SMARC
‐
iMX8MM
System
MTBF
(hours)
:
>100,000
hours
The
above
MTBF
(Mean
Time
Between
Failure)
values
were
calculated
using
a
combination
of
manufacturer’s
test
data,
if
the
data
was
available,
and
a
Bellcore
calculation
for
the
remaining
parts.
The
Bellcore
calculation
used
is
“Method
1
Case
1”.
In
that
particular
method
the
components
are
assumed
to
be
operating
at
a
50
%
stress
level
in
a
40°
C
ambient
environment
and
the
system
is
assumed
to
have
not
been
burned
in.
Manufacturer’s
data
has
been
used
wherever
possible.
The
manufacturer’s
data,
when
used,
is
specified
at
50
o
C,
so
in
that
sense
the
following
results
are
slightly
conservative.
The
MTBF
values
shown
below
are
for
a
40
o
C
in
an
office
or
telecommunications
environment.
Higher
temperatures
and
other
environmental
stresses
(extreme
altitude,
vibration,
salt
water
exposure,
etc.)
lower
MTBF
values.
2.4.6.
Power
Consumption
The
power
consumption
values
listed
in
this
document
were
measured
under
a
controlled
environment.
The
hardware
used
for
testing
includes
an
SMARC
‐
iMX8MM
module,
carrier
board
is
EVK
‐
STD
‐
CARRIER
‐
S20
with
7
‐
inch
LVDS
display,
SD
card
and
USB
keyboard.
The
carrier
board
was
powered
externally
by
a
power
supply
unit
so
that
it
does
not
influence
the
power
consumption
value
that
is
measured
for
the
module.
The
USB
keyboard
was
detached
once
the
module
was
configured
within
the
OS.
All
recorded
values
were
averaged
over
a
30
second
time
period.
The
modules
were
cooled
by
the
heatspreader
specific
to
the
module
variants.
Each
module
was
measured
while
running
Yocto
Sumo.
To
measure
the
worst
case
power
consumption,
the
cooling
solution
was
removed
and
the
CPU
core
temperature
was
allowed
to
run
between
95°
and
100°C
at
100%
workload.
The
peak
current
value
was
then
recorded.
This
value
should
be
taken
into
consideration
when
designing
the
system’s
power
supply
to
ensure
that
the
power
supply
is
sufficient
during
worst
case
scenarios.
Power
consumption
values
were
recorded
during
the
following
stages:
