Baza Porad Serwisowych
LC73721 - schemat blokowy
25
DP
2 DP
RAM
R1 logic
VDD VSS
23
14x4x30
18 19
MUTE1
3 Mute1
R2
logic
26
4
K-tone
R3
KTONE
logic
5 20
R4
SP-control
SPCTL
logic
22
6
MUTE2
R5
Mute2
Control logic
logic
30
C1
DTMF
21
generator
DTMF
Key
33
C2
inter-
27
HOOK cont-
HOOKCTL
face
rol logic
35
logic
C3
28
Hold-out
HOLDOUT
logic
36
24
C4
SOUT
Input logic
Serial-out
logic
1
C5
31
7 8 9 11 13 14 29 10 17
12
C6
32
C7
15 16
XIN XOUT
34
C8
Hook switch
LC73721 - typowa aplikacja
1 2 3 F 00 05 10 15
M 01 06 11 16
5
4 6
R/P 07 12 17
02
7 8 9
Hold
03 08 13 A4
0 #
Sp key
ON/OFF
*
STORE 04 09 A5
14
A1 A2 A3
C5 C4
1 36
R1 C3
2 35
C8
R2
3 34
R3 C2
4 33
R4 C7
5 32
R5
C6
6 31
Branch detector
SOUTENA C1
7 30
HOLDOFFIN DISCONIN
8 29
Hook switch
ONHOOKDIALIN
HOLDOUT
9 28
ON
SI/KEY HOOKCTL
10 27
OFF
OFFHOOK KTONE
11 26 Speech
DPR DP
12 25 circuit
P/T SOUT
and
13 24
BMR MUTE1 speaker
14 23
3.58MHz
XIN MUTE2 ampli-
15 22
fier
XOUT DTMF
16 21
OFF/ONHOOKSTORE
SPCTL
17 20
VDD VSS
18 19
SERWIS ELEKTRONIKI
P/T
DPR
BMR
SI/KEY
SOUTENA
OFFHOOK
DISCONIN
HOLDOFFIN
ONHOOKDIALIN
OFF/ONHOOKSTORE
LC73721