CH224ATF(1999) Ver la hoja de datos (PDF) - Cermetek Microelectronics

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CH224ATF
(Rev.:1999)

Complete 2400 bps Modem Module

Cermetek Microelectronics 

PRELIMINARY

CH224ATF

HARDWARE INTERFACE

Serial/Indicator Interfaces

A DTE serial interface and indicator output are supported.

Serial Interface. A TTL logic serial interface to the DTE is supported.

LED indicator interface. Four direct connect LED indicator outputs are supported.

Speaker Interface

A speaker output, controlled by AT or V.25 bis commands, is provided for an optional OEM-supplied speaker circuit.

Line Interface

The CH224ATF connects to the telco line via tip and ring signals.

TTL

SERIAL

INTERFACE

CH224ATF

TELCO JACK

& EMI

FILTERING

INDICATOR

LEDS

TTL Serial Interface

SPEAKER

CIRCUIT

CH224ATF Integrated System Block Diagram

LOW POWER MODES

Sleep mode

Entry. The modem will enter the low power sleep

mode when no line connection exists and no host

activity occurs for the period of time specified in the

S24 register. All device circuits are turned off except

the internal MCU clock circuitry in order to consume

lower power, but are able to immediately wake up and

resume normal operation.

Wake-up. Wake-up occurs when a ring signal occurs,

or the DTE sends a character to the modem.

©1999 Cermetek Microelectronics, Inc.

HARDWARE INTERFACE

SIGNALS

The SocketModem pin assignments for serial

TTL interface selected are shown in Figure 2

and are listed in Table 7.

The SocketModem hardware interface

signals are defined in Table 9.

The digital electrical characteristics for the

hardware interface signals are listed in Table

10.

The analog electrical characteristics for the

hardware interface signals are listed in Table

11.

The current absolute maximum ratings are

listed in Table 13.

5

Document No. 607-0005 Rev.A (11/99)

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