KX-FT21RS
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 | |
31 | XCTS/IOP33 | 3.3V | YES | O | ||
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 | 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 |
