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Physio Control LIFEPAK 9 - Instrument Interface

Physio Control LIFEPAK 9
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Description
1
Microcontroller
U17
uses
a
16-bit
address/data
bus
for
accessing
the
external
memory.
Eight
bus
lines
at
P3
(O-7)
are
available
for
data,
and
up
to
15
lines
(P3
0-7
and
P4
0-6)
can
be
used
for
addressing
by
activating
the
ALE
(address
line
enable)
line.
Latch
U16
retains
the
latest
address
on
P3.0-.7
when
that
port
is
used
for
data
transfer.
Instrument
Interface
Isolation
between
the
patient
and
the
LIFEPAK
9
Shock
Advisory
Adapter
is
provided
by
the
Instrument
Interface
circuit.
This
isolation
barrier
is
rated
to
withstand
up
to
7500Vac
(at
60Hz)
with
less
than
10uA
leakage.
Commands
from
the
adapter
front
panel,
the
Shock
Advisory
Inhibit,
and
the
Serial
Communication
are
routed
through
opto-isolators
U4
through
U7.
The
ANALYZE
pushbutton
on
the
front
panel
initiates
microcontroller
(U17)
analysis
of
the
ECG
signal
in
the
Analyze
Interface
circuit.
After
the
microcontroller
completes
analysis
of
the
ECG
signal,
the
data
from
the
serial
communication
lines
displays
on
the
CRT
as
messages.
The
cathode
of
opto-isolator
U6
connects
to
the
ANALYZE
SW
line
and
isolates
the
ANALYZE
pushbutton.
Pressing
the
ANALYZE
pushbutton
grounds
the
cathode
of
U6
and
produces
a
logic
low
at
the
output.
This
transmits
to
the
input
of
NOR
gate
U12D.
When
both
the
ANALYZE
SW
line
and
the
Serial
Communication
line
are
low,
Ul2D
switches
high
and
the
microcontroller
starts
to
analyze
the
ECG
signal.
The microcontroller
illuminates
the
ANALYZE
LED
while
it
analyzes
the
ECG
signal.
When
the
microcontroller
starts
ECG
signal
analysis,
it
produces
a
high
logic
signal
at
port
P1.3.
This
signal
causes
Q7
to
conduct,
producing
a
low
signal
output
from
U7.
MOSFET
GS
in
turn
conducts
and
provides
drive
current
for
the
ANALYZE
LED.
All
communication
involving
transmission
of
Display
data
for
the
LIFEPAK
9
defibrillator/monitor
takes
place
through
the
Serial
Communication
lines
at
post
P2.0
and
P2.1
on
microcontroller
U17.
Transistor
Q2
amplifies
the
serial
transmit
data
(TXD)
from
the
LIFEPAK
9
defibrillator/monitor
for
isolation
across
U5.
U11F
inverts
the
serial
receive
data
(RXD)
while
Q6
amplifies
the
signal.
Isolation
is
provided
by
U4.
©
November
1994
Physio—Control
Corporation
All
Rights
Reserved
1-9

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