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TP4
T POINT M6
Power OUT
C4
1uF_3216
U4
1
A0
VCC
2
A1
3
A2
4
VSS
24LC256/SOIC
U5
1
A0
VCC
2
A1
3
A2
4
VSS
24LC256/SOIC
U6
1
A0
VCC
2
A1
3
A2
4
VSS
24LC256/SOIC
U18
1
A0
VCC
2
A1
3
A2
4
VSS
24LC256/SOIC
Serial EEPROM
TP3
T POINT M6
U22
XTAL2
32.768kHz
1
X1
2
X2
SQW/OUT
3
VBAT
4
GND
BT1
DS1307
3V LITHIUM
N-550B
TP5
T POINT M6
U3
8
1
VIN
VOUT
7
2
D3
GND
GND
B140
C5
6
3
GND
GND
1uF
5
4
NC
NC
RA1
LM78L05A/SOIC
TP6
+5V
T POINT M6
L26
8
R6
R7
C79
0.56uH_2012
0.1uF
2K
2K
7
WP
6
SCL
5
C7
SDA
47pF
+5V
XTAL1
32MHz
C6
47pF
RA1
8
R40
R41
+5VA
2K
2K
7
WP
6
SCL
5
SDA
+5V
8
R42
R43
2K
2K
7
WP
6
SCL
5
SDA
+5V
8
R44
R45
TP1
2K
2K
T POINT M6
7
WP
6
SCL
SCL
5
SDA
SDA
TP2
T POINT M6
+5V
R4
R5
8
Vcc
2k
2k
7
6
SCL
5
SDA
+5VA
+5VA
+5V
C71
C72
C73
C74
C75
C76
C77
D4
B140
2.2nF
2.2nF
2.2nF
2.2nF
10nF
10nF
10nF
+5VA
U1
51
OSC2
45
SCL
RA2/SS
TP11
46
SDA
RA3/SDI/SDA
T POINT M6
43
RX1
RA4/RX1/DT1
42
TX1
RA5/TX1/CK1
59
RB0
RB0/CAP1
58
RB1
RB1/CAP2
54
RB2
RB2/PWM1
57
RB3
RB3/PWM2
56
RB4
RB4/TCLK12
55
RB5
RB5/TCLK3
47
RB6/SCK
48
RB7/SDO
Nurse Call 1
3
RC0/AD0
RC0
67
RC1
RC1/AD1
66
RC2
RC2/AD2
65
RC3
RC3/AD3
64
RC4
RC4/AD4
63
RC5
RC5/AD5
62
RC6
RC6/AD6
16
61
RC7
MCLR/Vpp
RC7/AD7
17
TEST
50
11
RD0
OSC1
RD0/AD8
10
RD1
RD1/AD9
60
9
RD2
RA0/INT
RD2/AD10
44
8
RD3
RA1/TOCKI
RD3/AD11
7
RD4
RD4/AD12
29
6
AVss
RD5/AD13
RD5
30
5
AVDD
RD6/AD14
RD6
4
RD7/AD15
RD7
12
RE0
RE0/ALE
13
RE1
RE1/OE
14
RE2
RE2/WR
15
RE3
RE3/CAP4
28
RF0
RF0/AN4
27
RF1
RF1/AN5
26
RF2
RF2/AN6
25
RF3
RF3/AN7
24
RF4/AN8
23
RF5/AN9
22
TX422EN
RF6/AN10
21
Alarm SW
RF7/AN11
34
RG0/AN0
RG0
33
Nurse Call 2
RG1/AN1
32
RG2/AN2/VREF-
31
RG3/AN3/VREF+
38
anteld
RG4/CAP3
39
POWER ON
RG5/PWM3
41
RX2
RG6/RX2/DT2
40
TX2
RG7/TX2/CK2
PIC17C756/PLCC
Main Control Unit
C78
10nF
+5V
Q18
2N2222A
R24
100
J4
CON2
U15
12
RD0
ID0
+5V
11
RD1
ID1
13
RD2
ID2
R3
14
RD3
ID3
10K
10
RD4
ID4 (!SHUTDOWN)
1
TP8 T POINT M6
6
RD5
ID5 (!DECODE)
RT1
5
RD6
ID6 (HEXA/!CODE B)
10k_THER
7
RD7
ID7 (DATA COMING)
t
8
INPUT_V
RC0
!WRITE
R22
9
RC1
MODE
22.1K_F
1
TP7
T POINT M6
R23
6.81K_F
ICM7228AIPI
Single ICM7228 Driver
Technical Discussion
+5VB
C61
47uF_16VEL
C26
0.1uF
19
VDD
27
SEG a
SEG a
3
SEG b
SEG b
1
SEG c
SEG c
25
SEG d
SEG d
2
SEG e
SEG e
24
SEG f
SEG f
26
SEG g
SEG g
4
DP
DP
15
DIGIT 1
DIGIT 1
16
DIGIT 2
DIGIT 2
23
DIGIT 3
DIGIT 3
20
DIGIT 4
DIGIT 4
17
DIGIT 5
DIGIT 5
22
DIGIT 6
DIGIT 6
21
DIGIT 7
DIGIT 7
18
DIGIT 8
DIGIT 8
28
VSS
Figure 54: Main PCB MCU and
Storage Control Schematic Diagram
127
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