CH1788ET 데이터 시트보기 (PDF) - Cermetek Microelectronics

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CH1788ET

Surface Mount PLCC 2400bps Modem

Cermetek Microelectronics 

Cermetek Microelectronics, Inc.

CH1788 Surface Mount PLCC 2400bps Modem

Table 5. CH1788 AT Command Set Summary.

Basic

Commands

Function

AT

Attention Code

A

Answer command

A/

Repeat last Command

C

Carrier Detect DCD Signal Monitor

D

Dial Command

E

Off-Line Character Echo Option

H

Switch Hook Control Option

I

Identification Option

K

DCE-DTE Flow Control

L

Fast Connect Option

N

Data Set Ready DSR Signal

Monitor

O

On-Line Command

P

Pulse Dial

Q

Result Code Display Option

R

Data Terminal Ready DTR Monitor

S

S Register Monitor

T

Tone Dialing

V

Verbose / Numeric Result Codes

W

Extended Result Codes

X

Result Code Set/Call Progress

Y

Async. Speed Buffered Option.

Z

Reset

@T

Test Modes

@Z

Power Down

+++

Escape Sequence

PSTN LINE CONNECTION GUIDELINES

1. The CH1788 must be mounted in the final

assembly such that it is isolated from exposure to

any hazardous voltages within the assembly.

Adequate separation and restraint of cables and

cords must be provided.

the RJ-11C jack. Doing so will invalidate the

FCC approval.

7. The CH1788 requires external surge protection.

This is mandatory to maintain FCC Part 68

conveyed approval. Please use only

recommended components and values. Do not

use an MOV or a Transorb.

8. The CH1788, the RJ-11C jack, the protection

circuitry and all PCB traces in between, must be

contained on a PCB with a 94 V-0 flammability

rating.

9. The supplied FCC registration label must be

applied visibly on the outside of the product.

10. The product’s User Manual must provide the user

with instructions for connection and use as

recommended in the FCC Registration Section

below.

CH1788 HANDLING AND ASSEMBLY

RECOMMENDATIONS

The CH1788 contains static-sensitive components

and should only be handled by personnel and in

areas that are properly protected against static

discharge.

Direct Soldering. The CH1788 may be wave

soldered. All CH1788 products are moisture resistant

and will not be harmed by industry standard wave

soldering processes. Cermetek recommends against

socketing the modem for production products.

However, for development purposes a 68 pin PLCC

socket may be used.

2. The circuitry from the CH1788 to the telephone

line interface must be provided in wiring that

carries no other circuitry other than that

specifically allowed in the FCC rules.

3. Connection to phone line should be made

through an approved RJ-11C jack.

FCC REGISTRATION

The CH1788 is registered with the FCC (Federal

Communications Commission) under Part 68. To

maintain the validity of the registration, the end

product supplier must notify to the end user of the

product of several restrictions the FCC places on the

CH1788 and its use.

4. PCB traces from the modem’s RING and TIP pins

to the RJ-11C jack must be 0.1 inch spacing or

greater to one another and 0.2 inch spacing or

greater to all other traces. The traces should

have a nominal width of 0.020 inches or greater.

5. The RING and TIP PCB traces should be as

short as possible and oriented to prevent

coupling other high speed or high frequency

signals present on the host circuit PCB.

In addition to restriction notification, the FCC requires

that Cermetek make all repairs to the CH1788. If

repairs are necessary after installation of the CH1788

in the end product and the end product has been

delivered to the end user, the end product must be

returned to the end product supplier where the

CH1788 can be removed and then forwarded to

Cermetek for repair. The following notice is

recommended and should be included in the end

product’s user manual.

6. No additional circuitry other than that shown may

be connected between the modem module and

2003 Cermetek Microelectronics, Inc.

Page 11

Document No. 607-0018 Revision A2 (07/03)

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