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Pin Pin Name Buffer Power supply 5V Tolerant Signal Name I/O Description
26 IRDATXD/IOP81 3.3V YES OPEN O Not used
27 IRDARXD/IOP80 3.3V YES OPEN O Not used
28 TXD/IOP30 3.3V YES BREAK O TEL Line Break Control
29 RXD/IOP31 3.3V YES H/S ALC I Not used (Hardware Control)
30 XRTS/IOP32 3.3V YES DTMF IMP O DTMF-IMP Control
31 XCTS/IOP33 3.3V YES P-SHORT O P-SHORT Control
32 XDSR/IOP34 3.3V YES OPEN O Not used
33 DCD/IOP35 3.3V YES OPEN O Not used
34 XDTR/IOP36 3.3V YES OPEN O Not used
35 RI/CLK/IOP37 3.3V YES OPEN O Not used
36 IOP90 3.3V YES OPEN O Not used
37 IOP91 3.3V YES OPEN O Not used
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 Power 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 YES 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 MILAT/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 Power supply
62 EVOLIN (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 EYECKO 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 Power 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
102
KX-FT21RS