Panasonic KX-FT21BX

CIRCUIT OPERATIONS
- 113 -
KX-FT21LA
38
VSS
DG
Ground
39
IOP92 3.3V
YES OPEN O
Not used
40
IOP93 3.3V
YES OPEN O
Not used
41
IOP94 3.3V
YES OPEN O
Not used
42
IOP95 3.3V
YES OPEN O
Not used
43
3.3V
+3.3V
Pow er supply
44
FMEMCS/IOP27 3.3V
YES OPEN O
Not used
45
FMEMDO/IOP26 3.3V
YES I
Not used
46
FMEMDI/IOP25 3.3V
YES O
Not used
47
FMEMCLK/IOP24 3.3V
Y ES TELRXENB I/O
Telephone RX root control
48
CBUSY2 3.3V
-OPEN
Not used
49
CSO/OP70 3.3V
-OPEN
Not used
50
CBUSY1 3.3V
YES OPEN
Not used
51
CCLK 3.3V
YES OPEN
Not used
52
CSI 3.3V
YES OPEN
Not used
53
MIDAT/IOP45 MULT3/5
YES MTXENB O
Modem TX route control
54
MICLK/IOP46 MULT3/5
YES MOMRXENB O
Modem RX route control
55
MILA T/IOP47 MULT3/5
YES H/SRXENB O
Handset RX route control
56
RVN 3.3V
YES BELL
Bell signal detection
57
CPC 3.3V
YES PAPER
Recording paper detection
58
TONE1 3.3V
-TONE1
Not used
59
TONE2 3.3V
-TONE2
Tone2 (bell, alarm, key tone)
60
VSS
DG
Ground
61
3.3V
+3.3V
Pow er supply
62
EV OL IN ( 3.3V )
-EVOL IN
Electronic volume (handset, monitor)
63
EVOLOUT (3.3V)
-EVOL OUT
Electronic volume (handset, monitor)
64
EVOLREF (3.3V)
-EVOL REF
Electronic volume (handset, monitor)
65
VSS
DG
Ground
66
IOP57 3.3V
YES EX-HOOK O
Not used
67
XMDMINT 3.3V
YES XINTMDM
Modem interrupt
68
XINTMDM 3.3V
-XMDMINT
Modem INT output/general output
69
XNMI/XINT 3.3V
YES XNMI
NMI
70
EYECKO MULT3/5
NO EY ECKO
Modem AFE connection (APDMCK)
71
APDMDT 3.3V
YES APDMDT
Modem AFE connection
72
C3 MULT3/5
NO C3
Modem AFE connection
73
C4 MULT3/5
NO C4
Modem AFE connection
74
C5 MULT3/5
NO C5
Modem AFE connection
75
MULT3/5
+5V
Pow er supply
76
DPDMDT MULT3/5
NO DPDMDT
Modem AFE connection
77
DPDMCK MULT3/5
NO DPDMCK
Modem AFE connection
78
MUTE MULT3/5
NO MUTE
Modem AFE connection
79
XEYESYC MULT3/5
NO XEYESYC
Modem eye pattern EYESYNC
80
EYEDAT MULT3/5
NO EYEDAT
Modem eye pattern EYEDAT
81
XRESETD MULT3/5
NO XRESETD
Modem AFE connection
82
CPUCK 3.3V
-CPUCK
CPU clock (6MHz) output
83
XHOLDAK 3.3V
-OPEN
Not used
84
XWAIT/IP60 3.3V
YES HOOK
Hook detection
85
XHOLD/IP61 3.3V
YES PULL DOWN
Not used
86
XHSTRD/IOP40 3.3V
YES H/S MUTE O
Handset TX mute
87
VSS
DG
Ground
88
XINMDM 3.3V
NO
20.736MHz crystal oscillator buffer
89
XOUTMDM 3.3V
-
20.736MHz crystal oscillator buffer
90
TEST1 3.3V
NO +3.3V
Test pin. fixed High
91
TEST2 3.3V
NO +3.3V
Test pin. fixed High
92
XTEST 3.3V
-XTEST
24MHz clock output
93
TEST3 3.3V
NO +3.3V
Test pin. fixed High
94
XOUT 3.3V
-
XOUT 24MHz oscillator
95
XIN 3.3V
NO
XIN 24MHz oscillator
96
VSS
DG
Ground
97
3.3V
+3.3V
Pow er supply
98
TEST4 3.3V
NO +3.3V
Test pin. fixed High
99
XHSTWR/IOP41 3.3V
YES RLY O
Tel line relay control