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| 型號： | CH2000ET |
| 英文描述： | Telecommunication IC |
| 中文描述： | 通信集成電路 |
| 文件頁數(shù)： | 1/12頁 |
| 文件大?。?/td> | 1180K |
| 代理商： | CH2000ET |
Cermetek Microelectronics, Inc. Document No.607-0002 Rev. D (8/99) 1
1999
Non-Volatile RAM (NVRAM).
The NVRAM present on the CH2000 is sufficient to store up to two
user customized modem configurations. The AT&Wn command
will store the active modem configuration in the selected NVRAM
locations by specifying an n of 0 or 1. The AT&Yn command selects
the modem configurations to be automatically recalled and made
active upon a reset or power up. The ATZn command immediately
recalls and activates a stored configuration. Refer to Tables 4 and
5 for storeable S-Registers and available commands.
INTRODUCTION
At 0.34 inches (nominal), Cermeteks CH2000 is the lowest
profile full function FCC Part 68 approved modem
commercially available. It has been designed to be used in
applications where an extremely low profile is required. The
CH2000 fully supports V.22bis and associated standards
and is controlled through the AT command set.
FEATURES
Supports Standards CCITT V.22bis, V.22,
Bell 212, and Bell 103
FCC Part 68 approved and DOT CSA CS-03 Part I
approvable
AT Command structure available
1000 VAC isolation barrier
Single 5 volt operation
Low power sleep mode
Automatic adaptive and fixed compromise
equalization
Test modes and diagnostics
Size: 2.0 x 1.12 x 0.34 (nominal)
NVRAM allows storage of custom configurations
and telephone numbers
Commercial Operating temperature 0
o
to 70
o
C
Extended temperature -40
o
C to 85
o
C order
CH2000ET
DESCRIPTION OF FUNCTIONAL BLOCKS
AND DISCUSSION OF BASIC OPERATIONS
Figure 1 contains a functional block diagram of the CH2000.
The CH2000 is a highly integrated, full function modem,
comprised of a modulator/demodulator, controller, NVRAM
(Non-Volatile Ram) and an FCC Part 68 approved telephone
interface (Data Access Arrangement -DAA).
Modulation/Demodulation and Modem
Controller.
These functions are provided by a monolithic modem inte-
grated circuit. This IC has built-in facilities accomodating
integrated AT command control and containing the nec-
essary resident interfaces for general communication and
routing to the DAA.
CH2000 Low Profile Full Function
2400 bps Modem
C
ermetek
Figure 1. Functional Block Diagram of CH2000.
equivalent. This label should be prominently displayed on any
system containing the CH2000. With the exception of the U.S.,
most countries (including Canada) require submission of the
final product or system containing the CH2000 for regulatory
agency approval. This is typically done by submitting the design
to a test house or consultant for evaluation against the applicable
regulatory standards. Call Cermetek for a consultant list.
SUPPORTED FEATURES
AT Command Set.
The CH2000 supports a 40-character command line. The com-
mand line starts with AT and may contain standard or enhanced
commands. See Cermeteks command summary at
(www.cermetek.com), for a detailed discussion of AT Commands.
Telephone Line Interface or DAA.
The CH2000 is designed to comply with North American telephone
standards as set by FCC Part 68 (USA) and DOT CSA CS-03
Part I (Canada). Among the more critical parameters, the CH2000s
telephone line interface provides 1000VAC and 1500 volt peak
surge isolation. Consequently, the CH2000 satisfies U.S. and
Canadian requirements and will meet other international require-
ments that specify this high level of isolation. The CH2000 is FCC
Part 68 preapproved and is shipped from the factory with an FCC
Part 68 approval label indicating the registration number and ringer
Serial Host Interface.
The CH2000 utilizes a V.24 (EIA-232-D) compatible interface. Refer
to the pin descriptions in Table 2.
Speaker Interface.
The SPK output reflects the receiver analog input and provides a
signal that can be used to monitor call progress. The SPK signal
can drive a 300
load directly. Typically, the SPK signal is input
into an audio power amplifier and the amplifier, inturn, drives a
speaker coil.
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