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參數(shù)資料
| 型號(hào)： | CH2000 |
| 英文描述： | Telecommunication IC |
| 中文描述： | 通信集成電路 |
| 文件頁(yè)數(shù)： | 2/12頁(yè) |
| 文件大?。?/td> | 1180K |
| 代理商： | CH2000 |
Cermetek Microelectronics, Inc.
1999
Document No. 607-0002 Rev. D (8/99) 2
Power Supply.
The speaker is activated with the ATMn command. The speaker
volume is adjusted using the ATLn command, where n is 0, 1, 2,
or 3. Increasing numbers correspond to higher volume. Figure 5
illustrates one technique of driving an external 8
speaker.
Phone Control.
Cermeteks CH2000 contains a pin called Voice/Data (V/D). The
V/D pin toggles high when the modem goes off hook. This pin
can be used to activate a relay which can switch a telephone on
or off the Tip and Ring incoming PSTN lines. This feature allows
any telephone associated with the CH2000 to be disconnected
when a data call is in progress, thereby preventing the data from
being disturbed by an inadvertent telephone pick-up. See Figure
2.
Figure 2. Voice/Data Port Control.
Speed and Parity Selection.
Prior to call initiation, the host controller trains the modem to the
host speed (2400, 1200, or 300 bps) and parity (odd, even, mark,
space, or none) via a host-initiated training sequence. This train-
ing also sets the speed of the data for originate calls. The CH2000
will automatically adjust to the originators speed when answering
calls.
The CH2000 matches the hosts parity when it returns status mes-
sages to the host. During a data connection, however, the modem
passes parity through without interpretation or alteration.
The CH2000 modem module is a complex set of sub-systems.
During the course of normal operation the CH2000 decodes ana-
log signals from the telephone line that are in the millivolt range.
Steps must be taken by the user to guarantee that power supply
noise on all supply lines, including ground, does not exceed 50
mV peak to peak. Any frequency between 20 kHz and 150 kHz must
be less than 500
μ
V peak. If necessary, use dedicated power and
ground planes. Failure to provide such operating conditions could
cause the CH2000 to malfunction or to function erratically.
The CH2000 requires a single +5V ±5% supply. It is recommended
that by-pass capacitors be placed on the power supply as close to
the modems supply input as practical. It is recommended that a
10
μ
F Electrolytic capacitor in parallel with a 0.01
μ
F ceramic
pacitor be used.
WARNING: The CH2000 has been FCC Part 68 approved as a
data modem only. Utilization of the Voice/Tone Port requires further
registration. FCC will require that the system, including the CH2000
and the handset or DTMF transceiver, adhere to Part 68 rules.
ca-
Sleep Mode.
To minimize power consumption, the CH2000 includes a power
down feature called Sleep Mode. When activated, the CH2000
will automatically enter Sleep Mode after 0 to 254 seconds of inac-
tivity. The inactivity delay is selected using the ATS24 command.
The CH2000 is delivered from the factory with a 5 second inactivity
delay enabled (i.e., ATS24=5). The CH2000 returns to normal
operation when a ring signal is received or upon an input low
signal on the TXD pin. ATS24 = 255 disables the Sleep Mode and
is the default if no value is set in register S24.
A SLEEP output signal is available to control power to external
devices. In Figure 5, a FET controlled by the SLEEP signal turns
off the external speaker amplifier when the CH2000 enters Sleep
Mode. In Sleep Mode, power is reduced to approximately 50% of
normal operating power.
Transmission Speed.
In normal operation, the originating modem initiates the call and
attempts to connect to the answering modem at a speed estab-
lished by the originating modems controller prior to call initiation.
This is referred to as the Initial Trained Rate. Upon receiving the
call, the answering modem will attempt to connect to the originat-
ing modem at its Initial Trained Rate.
Table 1. Connection Rates.
l
n
m
e
e
R
d
o
M
d
e
g
n
e
r
T
w
s
n
A
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n
e
e
R
h
W
d
g
n
s
n
r
T
e
R
e
R
m
e
n
d
o
e
M
g
n
n
o
n
C
C
:
e
l
o
0
0
4
2
0
0
2
1
0
0
3
0
0
3
0
0
2
1
0
0
2
1
0
0
3
0
0
2
1
0
0
2
1
0
0
2
1
0
0
3
0
0
4
2
0
0
4
2
0
0
2
1
0
0
3
If these two rates are identical, the connection is made. If the
speeds differ, the answering modem must adjust its rate or termi-
nate the call. Table 1 indicates the connection rate that will result
when the calling modems Inital Trained Rate and the answering
modems Initial Trained Rate are different.
Note that a 2400 baud connection rate will only result if both mo-
dems are initially set at 2400 baud.
MODEM CONTROL
The CH2000 modem may be controlled by sending serial ASCII
command sequences. The commands are sent to the modem
serially on the TXD pin. After execution of a received command, the
modem returns a serial status message that can be read on pin
RXD. This message indicates command completion status. Re-
fer to Table 3 for a complete list of result codes.
The RI pin toggles low when the CH2000 detects an incoming call.
Although not TTL compliant, the RI pin can, nonetheless, be uti-
lized to activate external circuitry including the external RST pin.
When using the RI pin, it is recommended that a Schmitt Trigger or
the Isolated Envelope Detect Circuit in Figure 4 be placed between
the RI pin and the external load.
Ring Indicator (RI).
TELEPHONE
LINE
OPTIONAL
PHONE
TIP
RING
RING
TIP
RJ-11
Jack
RJ-11
Jack
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
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| CH-2000 | 制造商:Dantona Industries 功能描述:HI-TEMPERATURE NICKEL CADMIUM BATTERY; Battery Size Code:C; Battery Capacity:2Ah; Battery Voltage:1.2V; Battery Technology:Nickel Cadmium; External Diameter:26mm; External Height:50mm; Battery Terminals:Pressure Contact ;RoHS Compliant: NA |
| CH20003217G | 制造商:MA-COM 功能描述: |
| CH20-0032-17G | 功能描述:信號(hào)調(diào)節(jié) 824-960MHz IL:.3dB VSWR:1.6:1dB max RoHS:否 制造商:EPCOS 產(chǎn)品:Duplexers 頻率:782 MHz, 751 MHz 頻率范圍: 電壓額定值: 帶寬: 阻抗:50 Ohms 端接類型:SMD/SMT 封裝 / 箱體:2.5 mm x 2 mm 工作溫度范圍:- 30 C to + 85 C 封裝:Reel |
| CH20-0032-17G_1 | 制造商:MA-COM 制造商全稱:M/A-COM Technology Solutions, Inc. 功能描述:Low Cost SMT 17dB Bi-Directional Coupler, 824-960 MHz |
| CH20-0032-17G-RTR | 制造商:MA-COM 制造商全稱:M/A-COM Technology Solutions, Inc. 功能描述:Low Cost SMT 17dB Bi-Directional Coupler 824 - 960 MHz |
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