PSU
and
charge
continued
the
feedback
given
by
IC602
allowing
for
intelligent
charging
with
charge
enable
provided
from
the
micro
via
M602
on
the
control
line
labeled
as
charge_enable
making
a
provision
for
extended
cell
life.
Multiple
regulators
are
used
to
supply
the
(low)
voltage
areas
of
the
design
these
are
1.4A
step
down
adjustable
regulators,
REG600
receives
a
19v
source
at
pin
one
the
output
voltage
is
set
by
R601
and
R640,
Mosfet
M600
allows
for
the
PSU
disable
with
the
3V
standby
supply
being
tapped
of
prior
to
the
switch.
REG602
and
REG603
operate
in
a
similar
fashion
although
utilize
the
chips
own
PSU
shutdown
control
option
at
pin
2
(SD)
under
control
of
micro
U301,
a
more
conventional
regulator
is
used
at
location
REG601
to
provide
the
1.8v
core
supply
to
U301.
IC601
provides
a
logic
switched
(EN_iPod_PWR)
current
limited
+5v
supply
to
the
iPod
to
whilst
also
preventing
an
over
current
situation
at
the
rear
panel
USB
input
+3v1
this
is
reported
to
the
main
micro
via
the
USB_PWR_FAULT
line.
REG604
(LDO)
provides
a
3v1
supply
to
the
Kleer
and
R.F
circuits
and
is
sourced
from
the
+5v
supply.
IC600
is
a
charge
pump
convertor
on
the
+5VA
power
supply
rail.
Micro
The
Micro
is
shown
in
two
halves
on
the
diagram
shown
as
IC301(a)
detailing
port
allocation
and
IC301(b)
detailing
power
supply
requirements
and
programming
header
with
reset
provided
by
IC303.
PSU
requirements
include
3V3
STBY
and
V1.8
(internally
generated
by
the
ATMEL)
The
below
table
details
the
IC301
pin
allocations
and
functions
Pin
number
Description
Associated
circuit(s)
6
AMP_TEMP_COM
Pin
32
of
power
amps
and
locations
IC504
IC505
IC506
7
DC_PWR_PRESENT
From
TR600
(sheet
6)
9
V_IOUT_POT
From
IC603
via
IC602
MAX1873
(sheet
6)
10
BATT_PWR_PRESENT
From
TR603
(sheet
6)
11
POS_SW
SW301
Rear
Panel
Bass
select
switch
12
DSP_12C_SDA
DSP
at
location
IC400
13
DSP_12C_SDL
DSP
at
Location
IC400