Figure 34: User Interface Pcb Schematic Diagram (Sheet 1 Of 3) - Nellcor OxiMax NPB-40 Service Manual

TC1034ECT
V5DIG
C69
0.1uF
R5
1.0M
R2
1.0M R3
1.0M
1.0M
R72
150K
C22
100pF
VON
R12
1.0M
R13
1.0M
C28
R48 R49
100pF
316K
453K
NPB-40
VON
C27
0.1uF
U9
3
IN+
1
1V21B 2
Out
4
IN-
1V8
C67
0.1uF
C9
V 5 A C K
0.1uF
C68
0.1uF
Internal pull-up
on PBRST'
Open Drain Outputs
3V0 U19
4 2
V 1 COMP1
16
COMP2
14 1
VCHK_OK 2
V 2 COMP3
15
COMP4 SPO2V_GOOD 2
12
V R E F
6
RST
11 8
Vpg RDIS
7
T0
9
T1
LTC2902-1
U7
LP339
5
2 1V21B
+ 2
4
-
R9
7
+ 1
6
-
9
2 PWR_ON
+ 14
8
-
11
R73
2
PWR_CMPN
+ 13
C23 562K
10
-
100pF C24 R74
3 12
649K
VON V+ GND
100pF
1V8
C26
0.1uF
LCD1_TEST 3
LCD1_COM1 3
VON
U8
LP339
R10
5
R11
1V21B
2
1.0M + 2
1.0M
4
-
7
+ 1
6
-
9
+ 14
8
-
11
C30
+ 13
10
100pF
-
R50
3 12
V C M P V+GND
523K
C29
100pF
C32
0.1uF
V C M P N 2
VON
C10
0.1uF
2
T21
U2 DS1832S R1 5.11K
1 7
WD_STB 2
PBRST ST
6
RST
UC_RSTN 2
2 5
TD RST R4 49.9K
3
TOL
8 4
V C C GND
3V0
J1
PButton
C1 0.1uF
3V0
R77
30.1K
KEYPD1 2
V C M P N 2
V C M P
RP5
30K
1 8
2 7
3 6
4 5
BAT_NEWN 2
BAT_LOWN 2
BAT_CRITN 2
LCD_SEGT1N 2
T2
T3
R17
2
T4
C11 U5
1 4
1uF
ITH/RUN SENSE-
R23
T5
20K
L1
3 6
F B S W
T7 10uH
LTC1779ES6 D2 R24
C21
MBR0520L
221K
100pF
R26
82.5K
3V0
R6
R8
R7
10K
30.1K
10K
7
SQW_OUT
5
RTC_SDAT
6
RTC_SCLK
4
2
Technical Discussion
3V0 1V8
U6 T6
LT1761ES5-1.8
1 5
IN OUT
3 4
C19
C20
SDN BYP
C17
C18
47uF 0.1uF 4.7uF
0.01uF
T9
T8
T1
U3
VBATTERY
DS1338Z-3
3
SQW/OUT
V B A T
1
S D A X 1 Y1
C3
SCL 32.768KHz
2 D1
X 2
8 3.6V
22mF
3V0
GND V C C
C8 0.1uF
3V0
V C M P
2 3
V C M P 2
R42
Q1
1M IRLML6401
PWR_CMPN
Figure 34
User Interface PCB
Schematic Diagram
(Sheet 1 of 3)
97