- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄383641 > MT884 (Mitel Networks Corporation) () PDF資料下載
參數(shù)資料
| 型號(hào)： | MT884 |
| 廠商： | Mitel Networks Corporation |
| 英文描述： | () |
| 中文描述： | （） |
| 文件頁數(shù)： | 7/11頁 |
| 文件大?。?/td> | 87K |
| 代理商： | MT884 |
Application Note
MSAN-144
A-235
Figure 4 - Logic Controller Timing
1 Ring Cycle = 6 sec
2 sec ON
4 sec OFF
Off-Hook
TIP/RING
RD
CD
(CNIC)
PWDN
(MMV QM)
QF
(FLIP FLOP)
RELAY
First
Ringing
Signal
FSK Signal
Second
Ringing
Signal
Voices
30 ms typical
1
4
6
10
2
0
3
5
7
8
9
11
12
13
Notes:
the objective is to apply the termination impedance between the first and second ringing bursts; during the FSK signal.
FLIP FLOP is in unknown state.
Ringing is detected, RD goes Low.
MMV is triggered, CNIC is powered up.
FLIP FLOP is reset by RD at Low.
Carrier is detected, CD goes Low.
RELAY goes Low due to QF High and CD Low.
Carrier is ended, CD goes High.
FLIP FLOP is clocked by CD going High, QF goes Low.
RELAY goes High due to QF Low or CD High.
FLIP FLOP is reset, QF goes High.
Voice is detected, CD toggles between Low and High.
RELAY momentarily goes Low due to QF High and CD Low.
FLIP FLOP is clocked by CD going High, QF goes Low and remains Low until ringing is detected.
MMV times out, QM returns to High, CNIC is powered down.
0
1
2
3
4
5
6
7
8
9
10
11
12
13
Micro-Controller Serial Read
In another interfacing method (not shown here),
DATA and DCLK are connected directly to two inputs
of a micro-controller port, and DR is connected to the
interrupt input. This eliminates the serial to parallel
shift register but increases the complexity of the
software. In this configuration, the micro-controller
polls the DCLK bit and stores the DATA value on
every DCLK low to high transition. DCLK toggles
high eight times for each character. When DR
pulses low, it marks the end of the 8-bit character
(and 10-bit word).
Multiple Line CID Card
Another advantage of the three pin interface is that it
is easy to use in applications where multiple CID
chips are required on the same card. This card
could, for example, be used in a PBX so that a CID
device needn't be built into every phone in the
building. This would also permit the use of existing
display station sets. In such a system, the number of
CNIC's could equal the number of incoming lines
from the central office. Since the number of
incoming lines is much smaller than the number of
station lines, the total number of CNIC's required for
a system can be greatly reduced. This CNIC card
could have many CNIC's with only a single
inexpensive micro-controller used to convert the
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MT8860 | DTMF DECODER |
| MT8860XC | DTMF DECODER |
| MT8860XE | DTMF DECODER |
| MT8865 | DTMF Filter |
| MT8865XC | DTMF Filter |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MT8840 | 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:ISO2-CMOS Data Over Voice Modem |
| MT8840-1 | 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:ISO2-CMOS Data Over Voice Modem |
| MT8840AE | 制造商:Rochester Electronics LLC 功能描述: 制造商:MITEL / ZARLINK 功能描述: 制造商:Zarlink Semiconductor Inc 功能描述: |
| MT8840AS | 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:ISO2-CMOS Data Over Voice Modem |
| MT8841 | 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:CMOS Calling Number Identification Circuit |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。