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T176
L10
1
2
7
RXD5V
2506033017Y0
C106
100pF
T180
L11
1
2
7
T X D 5 V
2506033017Y0
T183
L12
1
2
4
RST_L5V
2506033017Y0
C114
100pF
NPB-40
+5VRDIG
R23
698K
T177
+5VRDIG
C105
0.1uF
R50
301K
U33
T178
4
Vcc
-
1
SPO2_TXD
3
+
gnd
MAX9100
+5VRDIG
T182
R110
T181
49.9K
D13
+5VANALOG
BAT54A
+5VRDIG
SPO2_RXD
C112
R85
100pF
R111
T184
75.0K
698K
+5VRDIG
C113
R86
0.1uF
301K
U34
4
Vcc
-
1
3
+
gnd
MAX9100
T185
T187
T189
T191
T186
T188
T190
WRITE_TO_MEMORY
KEYPD3
A L A R M _ O F F
KEYPD4
DOWN_ARROW
KEYPD7
MENU
KEYPD6
UP_ARROW
KEYPD5
POWER
2
KEYPD1
BACKLIGHT
KEYPD2
KEYPD7
R97
KEYPD5
845K
KEYPD3
+5VRDIG
2
PWR_ON
2
KEYPD1
C75
R98
C81
100K
3
VCHK_OK
0.1uF
0.1uF
J5
Engineering Mode
1
Mfg_Test
2
SPO2_RSTN
J4
1
2
3
4
5
6
7
8
CON8
+12VR
T131
C92
J2
4.7U
HEADER 12X2
2
1
4
3
6
5
DOWN_ARROW
8
7
MENU
UP_ARROW
10
9
A L A R M _ O F F
WRITE_TO_MEMORY
12
11
BACKLIGHT
V 5 A C K
14
13
V5DIG
16
15
18
17
PWR_OFF 2
POWER
20
19
22
21
C115
24
23
4.7U
T141
J10
J7
J8
Technical Discussion
C107
VBATTERY 2
0.1uF
C108
0.1uF
KEYPD6
KEYPD4
KEYPD2
V C M P 3
VON 2,3
C109
0.1uF
Figure 27
SpO
PCB
2
Schematic Diagram
(sheet 1 of 7)
83
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