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參數(shù)資料
| 型號： | CH1799ET |
| 英文描述： | MODEM |
| 中文描述： | 調(diào)制解調(diào)器 |
| 文件頁數(shù)： | 3/16頁 |
| 文件大?。?/td> | 1942K |
| 代理商： | CH1799ET |
2000 Cermetek Microelectronics, Inc.
Page 3
Document No. 607-0003 Revision G (05/00)
The HS Modem Family requires a single +5V ±5% supply. It
is recommended that bypass capacitors be placed on the
power supply as close to the HS Modem’s supply input pins
as practical. It is recommended that a 10 μF or greater
tantalum capacitor in parallel with a 0.1 μF ceramic capacitor
be used. The user must also provide shielding from nearby
sources of EMI, such as relays, motors and other power
supplies.
Figure 2. Zero Power Operation.
Automatic Speed/Format Sensing.
The HS Modem supports both Command and Data modes of
operation.
The HS Modem can automatically determine the speed and
format of the data sent from the DTE over the serial interface;
and can sense the following broad range of speeds:
CH1794
300, 600, 1200, 2400, 4800, 7200, 9600, 12000,
14400, 19200, 38400, and 57600bps
CH1798/9 300, 600, 1200, 2400, 4800, 7200, 9600, 12000,
14400, 16800, 19200, 21600, 24000, 26400,
28800, 38400, 57600 and 115200bps
CH2056
300, 600, 1200, 2400, 4800, 7200, 9600, 12000,
14400, 16800, 19200, 21600, 24000, 26400,
28800, 38400, 57600, 115200 and 230400bps
The data formats in Table 1 are recognized by the HS
Modem family of products.
The HS Modem can sense data with mark or space parity
and configures itself as described in Table 2.
The HS Modem is trained to a selected speed with an AT
[CR] training sequence. Thus, the DTE to modem serial
interface speed can be set independent of the DCE or line
carrier connecting speed (with minor restrictions, see the AT
+ MS command). This allows greater flexibility when
selecting DCE line carrier modulation speed thereby affording
the user with optimum data throughput performance. To
maximize effective modem data throughput speed, the DTE
to modem serial interface speed should be set to the highest
speed available without invoking the use of the HS Modem’s
built-in flow control. Although flow control facilitates
communication with higher speed modes by the DTE, use of
flow control causes an overall throughput data rate penalty.
Table 1. Data Formats Recognized by HS Modem
Family.
Character
Length
(No. of Bits)
Data Length
(No. of Bits)
No. of
Stop Bits
Parity
None
Odd
Even
None
Odd
Even
7
7
7
8
8
8
2
1
1
1
1
1
10
10
10
10
11*
11*
*11 bit characters are sensed, but the parity bits are
stripped off during data transmission in Normal and
Error Correction modes.
Table 2. HS Modem Auto Configuration Based on DTE
Configuration.
DTE Configuration
HS Modem Configuration
7 mark
7 space
8 mark
8 space
7 none
8 none
8 none
8 even.
Figure 3. Speaker Control Circuit.
Voice/Tone Injection Port.
The HS Modem Family provides pin T1 to allow the user to
share the PSTN line interface associated with the modem
for voice and DTMF applications. Figure 5 contains a
schematic indicating one possible configuration for
voice/tone utilization.
All HS Modem products are designed with pin T1 coupled
directly to the internal DAA. When using the HS Modem in
data mode, T1 should float and be disconnected from any
potential signal because any signal on T1 during data
operation will affect the HS Modem’s output. If T1 is being
asserted from another application, use a relay or zero
impedance switch to disconnect T1 when in data mode.
Referring to Figure 5, use the variable resistor (POT) to set
required speaker volume.
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