Welch Allyn Atlas - Page 4

A
A
B
B
C
C
D
D
E
E
4 4
3 3
2 2
1 1
Isolation
Barrier
Isolated SpO2
Circuits
Grounded SpO2
Circuits
Rick Myers
Rick Myers
Mar 5, 1999
Mar 5, 1999
620002.dsn
5-39118
JAC 3/15/99 LPP
L.Phillips
Z. Psenicnik
J. Bello
3/16/99
3/16/99
3/17/99
B See ECN worksheet
SpO2 ESD
Ground
C
Improvements for ESD
and Fast Transients
LPP LPP4/27/995-39456
6/23/99LPP LPP5-39822
Mods to U2 clock line,
NVRAM pullup
D 7/9/99LPP5-39934
620002
D
Power Iso and SpO2 interface
C
46Friday, July 09, 1999
Title
Size
Document Number
Rev
Date: Sheet of
Welch Allyn Inc.
Schematic:
Release For Production
Approved
Checked
Designed
Drawn
Initial Date
REV
Description
ECN/ECO Init
Date Ckd
A Release to Production
T401-8
U402-1
C409-1
T401-4
T401-1
Q401-g
U402-sen
iso401-a
Q402-e
Q401-s
U401-1
U401-2
U401-7
sSpO2tx
Q403-e
sSpO2tx
U401-5
U402-e
U402-ref
U402-ct
U402-rt
iso402-a
U403-7
C421-1
U401-3
C408-2
iso401-b
opto-fb
u411-6
FE-Pwr-Sync
SpO2Out
+5V
filt+12V
+12V
iso+5Vdig
fVcc
fVcc
f+5V
+5V
fVcc
fVee
iso+5Vdig
iso+5Vdig
fVcc
S
S
S
S
S
iso+5Vdig
S
S
S
S
S
S
S
S
EED
ED
ED
S
SS
S
S
S
C423
1000pF
J403
Tab-.187
1
2
TP424
TP402
R405
215
C404
.047uF
C409
470pf
TP408
R414
6.19K
C411
2200pF
TP419
TP406
C401
.047uF
R420
9.09K
TP421
TP413
Q401
MTD3055V
23
1
4
J401
CON4
1
2
3
4
+ C418
4.7uF
TP412
TP407
C416
.047uF
+ C415
1uF
R415
100
TP422
TP409
R419
215
+
-
U401B
MC34072
5
6
7
84
C403
.047uF
C421
470pf
R417
10K
+ C406
100uF
R412
511
+
C407
100uF
R404
316K
TP401
+
-
U401A
MC34072
3
2
1
84
D401
MBRS130T3
TP415
TP420
+ C405
100uF
TP404
D403
MBRS130T3
TP405
C402
.047uF
C420
.047uF
R411
5.11K
R407
10
TP416
U403
LP2951C
8
7
3
6
2
1
5
4
VIN
FDBK
SHTDN
TAP
SENS
VOUT
ERR
GND
D405
BAV99L
1
3
2
R403
1K
R401
10K
R409
5.11K
TP411
+ C419
10uF
C417
680pf
R408
100
R418
5.11K
C410
.01uF
TP423
C413
.047uF
R406
0.2
C414
.047uF
C422
.047uF
TP403
R410
10K
U410
4N25
1 6
2
5
4
TP414
U402
LM3524DM
1
2
16
15
9
4
5
10
6
7
12
11
13
14
3
8
V-
V+
VREF
VIN
COMP
+SENSE
-SENSE
SHTDWN
RT
CT
CA
EA
CB
EB
OSCOUT
GND
+ C412
10uF
Q402
MMBT3906L
3
1
2
C408
.01uf
T401
IsoXfmr
5
8
1
2
3
4
R402
10K
Q403
MMBT3904L
3
1
2
R416
10K
R421
10K
U411
HCNW4503
2
3
8
6
5
TP417