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Part Name
Description
ST3917B View Datasheet(PDF) - STMicroelectronics
Part Name
Description
Manufacturer
ST3917B
SPEECH - TONE/PULSE DIALER - LED INDICATOR
STMicroelectronics
ST3917B Datasheet PDF : 16 Pages
First
Prev
11
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16
ST3917A - ST3917B
Figure 10 :
Test
V
DD
1
C1
ST3917A/B
R1
28
1 2 3
FLASH
R ow
2
C2
R2
27
4 5 6 TONE/P ULSE
C ol
3
C3
R3
26
7 8 9
P AUSE
4
SEL
470k
Ω
5
OSC
3.58MHz
6
P ULSE
P ulse
100k
Ω
Tone
S W2
7
MODE/PT
8
HKS
S W1
9
GND
V
ear
Re
+
10 F
RGR X
100pF
3.9k
Ω
+
100 F
10
RXOUT
11
GRX
12
RXIN
1 3
I
REF
1 4
V
CC
R4
25
MU/MFI
24
*
0 #
V
MF
LND
SECRET
V
DD
2 3
GDTMF
22
R DTMF
CDTMF
MIC+
21
MIC-
20
GTX
19
1F
1F
R G TX
100pF
REG
18
470nF
+
4.7 F
GDTMF = 20 log
V
LN
V
MF
Ve a r
CDTMF = 20 log
V
LN
V
LN
LN
17
ILINE
16
LED
15
LED
+
100 F
130k
Ω
I
LN
600
Ω
20
Ω
390
Ω
3.9k
Ω
100nF
620
Ω
390
Ω
Figure 11 :
Test
V
DD
1
C1
S T3917A/B
R1
28
1 2 3
FLAS H
Row
2
C2
R2
27
4 5 6 TONE/P ULSE
Col
3
C3
R3
26
7 8 9
P AUSE
4
SEL
470k
Ω
5
OS C
3.58MHz
6
PULSE
P ulse
100k
Ω
Tone
S W2
7
MODE/P T
8
HKS
S W1
9
GND
V
ear
Re
+
10 F
RGRX
100pF
3.9k
Ω
+
100 F
10
RXOUT
11
GR X
12
RXIN
1 3
I
REF
1 4
V
CC
R4
25
MU/MFI
24
*
0 #
LND
SECRET
V
DD
2 3
GDTMF
22
RDTMF
C DTMF
MIC+
21
MIC-
20
GTX
19
1F
1F
R G TX
100pF
REG
18
470nF
+
4.7 F
LN
17
ILINE
16
LED
LED
15
GRX= 20 log
V
ear
V
inp
V
LN
+
100 F
130k
Ω
I
LN
20
Ω
390
Ω
3.9k
Ω
V
inp
100nF
620
Ω
390
Ω
13/16
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