Control
Board
4-6
•
Audio
control
•
Memory
control
and
storage (system
alarms
with
time
stamps;
calibration values)
• Real-time clock control
and
interface
• Internal self-tests
•
Communicating
with
the feedback microcontroller.
Main
Microcontroller
Memory
A PSD413
programmable
peripheral
(U3)
provides
program
memory
(128K x 8 external EPROM)
and
data
memory
(2K x 8 external
battery-
backed
static RAM) for
the
main
microcontroller.
Additional
data
memory
is available from these sources:
• 256K x 8 microcontroller
internal
RAM
• 4K x 8 external static RAM (U4)
shared
with
the
feedback
microcontroller.
Battery-Backed
RAM
A socket
on
the
Control
board
contains a 3.0 V
lithium
button
cell
battery
(BTl)
that
provides
backup
power
for the 2K x 8 external RAM
on
the
PSD413 device (U3)
used
by
the
main
microcontroller. The battery-backed
RAM stores calibration
constants, last
setup
parameters,
and
temporary
data.
Feedback
Microcontroller
The
feedback microcontroller
(Ull),
like the
main
microcontroller,
is
an
80C562.
It
receives
commands
from the
main
microcontroller
and,
when
the
generator
is activated, establishes
the
appropriate
relay closures
and
activates RF
output.
It
continually adjusts the
output
signal
of
the
generator
by
controlling
the
high
voltage DC
power
supply
and
the
RF
clock circuitry.
It
is
primarily
responsible for these functions:
• Scaling relay control
and
output
relay control
• T_ON ASIC
waveform
control
• Leakage control (coag)
•
Constant
voltage,
current,
and
power
feedback control
•
ECON
initialization
• Real-time
information
update
(actual voltage, current,
power,
impedance, effect
mode)
•
Memory
tests
•
Communicating
with
the
main
microcontroller.
Force
F)(TM-C
Service
Manual
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