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參數(shù)資料
| 型號： | CH2000ET |
| 英文描述： | Telecommunication IC |
| 中文描述： | 通信集成電路 |
| 文件頁數(shù)： | 3/12頁 |
| 文件大?。?/td> | 1180K |
| 代理商： | CH2000ET |
Cermetek Microelectronics, Inc. Document No.607-0002 Rev. D (8/99) 3
1999
Figure 4.
CH2000 Application Diagram of Test Circuit.
Figure 3. Voice/Tone Injection.
Power-up Reset.
After applying power to the CH2000, the CH2000 generates an
internal reset pulse. The user can also reset the modem exter-
nally by applying a high-going reset pulse to the RST pin for at
least 10ms after the +5V power supply has stabilized. Delay send-
ing commands to CH2000 for 200ms after Power-up reset has
been initiated to allow the CH2000 to properly reset.
Each modem must be trained to match its hosts speed and parity
so that it is able to recognize serial asynchronous commands
sent to it by the host UART. The host must retrain the modem each
time a reset signal is applied on RST or after a RESET serial
command has been issued.
Training the Modem.
INITIALIZING THE MODEM
Before commands may be sent to the CH2000, the modem must
be initialized. This consists of two events:
1) Power-up reset . This is accomplished by applying a hardware
reset pulse to pin RST.
2) Initial modem training. The modem must be trained to the
hosts speed (2400, 1200, 300bps) and parity (odd, even, mark,
space or none).
These activities are briefly described below.
1
2
7
8
9
10
11
12
13
14
15
16
17
18
19
RING
TIP
RXA
DTR
NC
V/D
RST
RI
NC
DSR
NC
TXD
NC
NC
SLEEP
CH2000
34
33
32
31
30
29
28
27
26
25
24
23
22
21
20
NC
GND
VCC
RXD
NC
NC
NC
SPK
NC
NC
NC
NC
HS
DCD
GND
ENABLE RXA
4.7K
2N2222
1N914
+5V
A
B
499
1
4
3
2
+15V
20K
20K
TL064
82K
20K
0.1uF
0.1uF
0.1uF
0.1uF
0.1uF
2.2uF
nonpolar
63.4K
20K
R1
54K
7
6
11
28K
R2
5
TL064
MECHANICAL RELAY ONLY.
A ZERO IMPEDANCE SWITCH MAY REPLACE
THE RELAY AND TRANSISTOR CIRCUIT.
ADJUST R2 FOR THE DESIRED LEVEL OF AXT VOICE TO BE ECHOED TO AXR.
DECREASE RECEIVE GAIN SIGNAL AXR BY DECREASING VALUE OF R1.
-
+
+
-
VOICE OR DTMF
SIGNAL
AXR
AXT
RXD
HS
DCD
DSR
RI
CTS
TXD
DTR
+5V
GND
V.24
EIA-232-D
INTERFACE
OR
USART
TIP
RING
RJ-11
JACK
OPTIONAL
PHONE
CONTROL
RELAY
VOICE/DATA
SPK
SPEAKER
CONTROL
TELEPHONE
LINE
CH2000
ANALOG VOICE
INJECTED SIGNALS
RXA
TXA
EXTERNAL RESET
EARTH GND
*
RST
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