2
Hardware Description
42
Power Input Module (PIM)
A
power
input
module
(PIM)
between
the
input
fuses
and
main
power
brick
(
‐
48V
to
12V
supply)
provides
input
power
conditioning
and
the
following
additional
features:
•
Current
handling
up
to
300W
•
Inrush
current
limit
protection
•
Integrated
filter
designed
to
meet
CISPR
class
B
EMI
limits
•
11.88W
of
isolated
auxiliary
3.3V
power
for
IPMI
circuitry.
•
750mW
of
isolated
auxiliary
5V
power
for
IPMI
circuitry.
•
ORing
FETs
on
A
and
B
–48V
feeds
•
A/B
feed
loss
alarm
•
Hot
‐
swap
control
•
Glitch
hold
‐
up
circuit
based
on
external
capacitor
and
72V
charging
circuit
•
Input
under
voltage
and
over
voltage
protection
•
Over
current
and
thermal
protection
In
addition
to
the
above
features,
the
PIM
incorporates
circuitry
to
charge
external
voltage
‐
hold
capacitors.
These
external
capacitors
(1100uF/100V)
charge
to
a
nominal
72V
and
provide
short
‐
term
transient
and
power
loss
protection
in
support
of
PICMG
3.0
requirements.
Two
internal
PIM
regulators
(a
3.3V
switching
supply
and
a
5V
linear
supply)
send
power
to
IPMC
components,
the
FPGAs,
RTC
circuitry,
the
RTM,
H/S
LEDs,
and
temperature
sensors.
Payload power supplies
The
main
power
supply
(an
isolated
quarter
brick
DC
‐
DC
convertor;
the
brick)
is
a
‐
48V
to
12V
convertor.
It
supplies
all
of
the
+12VDC
power
for
the
CPM.
With
the
exception
of
the
+3.3V
and
+5V
output
from
the
PIM,
all
other
voltages
on
the
CPM
and
RTM
either
come
directly
from
or
are
converted
from
the
+12V
outputs
of
this
brick.
Refer
to
Figure 6
for
detailed
information
on
the
DC
‐
DC
convertors
that
connect
to
the
brick
output,
the
voltages/current
developed,
and
the
CPM
devices
that
individual
payload
power
supplies
feed.
Trusted Platform Module (TPM)
The
CPM
uses
an
Infineon
SLB9635TT1.2
Trusted
Platform
Module
(TPM)
to
implement
version
1.2
of
the
Trusted
Computing
Group
specification.
The
TPM
sits
on
the
LPC
bus
and
has
the
ability
to
assert
an
interrupt
through
the
PCH
Serial
IRQ
interface.
The
TPM
is
a
secure
key
generator
and
key
cache
management
device
that
supports
industry
standard
cryptographic
APIs.
The
TPM
contains
sufficient
cryptographic
functionality
to
generate,
store,
and
manage
cryptographic
keys
in
hardware
while
leveraging
the
resources
of
the
rest
of
the
system
platform.
The
five
major
functions
of
the
TPM
are:
•
Public
key
functions
for
on
‐
chip
key
pair
generation
using
a
hardware
RNG
