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Cermetek CH1788, Manual

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Cermetek CH1788 Manual Download Page 20

Cermetek Microelectronics, Inc. 

 

CH1788 Surface Mount PLCC 2400bps Modem 

 

2006 Cermetek Microelectronics, Inc. 

Page 20 

Document No. 607-0018 Revision A6 (01/06) 

 

SCHE

MATI

C 7 

Sugges

ted c

ircuit to inter

face 

RS-2

32 

logic to CH1

788 TTL V.24

 logic.

 

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Summary of Contents for CH1788

Page 1: ...cations Figure 1 Functional Block Diagram of CH1788 FEATURES Supports data rate standards ITU T V 22bis V 22 Bell 212 and Bell 103 Bell 202 V 23 Fast connect handshaking FCC Part 68 approved CS 03 Ind...

Page 2: ...the CH1788 to be fixed regardless of the connect or DCE speed i e the speed between the CH1788 and the remote modem The option exists to disable Speed Buffering by using the ATY0 command If Speed Buff...

Page 3: ...ommand while in command mode DTR Pin Toggle the DTR pin after executing the ATR3 command while in command mode POWER SUPPLY Although any standard 5 volt DC supply is acceptable the user should be awar...

Page 4: ...ll NOT go Off Hook This feature is enabled via register S110 Setup The LIU feature requires additional external circuitry See Schematic 5 and Schematic 6 Additionally register S110 must be set to 243...

Page 5: ...ng signal 6 DSR O Data Set Ready Active low A low indicates that handshaking with the remote modem is in progress and or the carrier of the remote modem has been detected and a valid connection is imm...

Page 6: ...application circuit in the Schematic 4 15 V I Caller ID Used to connect an external RC network to enable caller ID operation See the application circuit in the Schematic 4 18 S1 I O Audio Port Option...

Page 7: ...tivated by using the following command setup string Enter ATL3 CR Result OK IMPORTANT NOTE The Fast Connect feature is operational only for DTE speeds of 1200bps Bell 212 LONG SPACE DISCONNECT The lon...

Page 8: ...the AT sequence Enter AT CR Result OK Where A and T may be either upper or lower case but must be the same case CR represents carriage return The AT sequence is referred to as the attention sequence W...

Page 9: ...s Standard Result Codes Terse Verbose Meaning Description 0 OK Command Executed 1 CONNECT Carrier detected at 300bps 2 RING Ring Detected 3 NO CARRIER Did not detect carrier 4 ERROR Entry error 5 CONN...

Page 10: ...phone number ATD causes the modem to pick up the telephone line without dialing a number Programmable S Registers The CH1788 contains a variety of registers that store the configuration and personalit...

Page 11: ...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...

Page 12: ...which you have connected to your telephone line Upon request of the telephone company provide the FCC registration number and the ringer equivalence number REN both of these items are listed on the e...

Page 13: ...t fast acting device be used DO NOT USE AN MOV OR A TRANSORB The Sidactor or equivalent should be nominally rated at between 270 300 Volts In most environments 2 terminal surge suppressors are adequat...

Page 14: ...m Implementation Downloaded from Arrow com Downloaded from Arrow com Downloaded from Arrow com Downloaded from Arrow com Downloaded from Arrow com Downloaded from Arrow com Downloaded from Arrow com D...

Page 15: ...mplementation Downloaded from Arrow com Downloaded from Arrow com Downloaded from Arrow com Downloaded from Arrow com Downloaded from Arrow com Downloaded from Arrow com Downloaded from Arrow com Down...

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Page 18: ...m Arrow com Downloaded from Arrow com Downloaded from Arrow com Downloaded from Arrow com Downloaded from Arrow com Downloaded from Arrow com Downloaded from Arrow com Downloaded from Arrow com Downlo...

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Page 21: ...lf Test Pattern Generator Alternate ones and zeros and error detector to be used along with most loopbacks A number indicating the bit errors detected is sent to DTE Line Equalization Fixed compromise...

Page 22: ...ans Hybrid Loss 25 dB 600 Ohm RXA TXA Ring Voltage Loop 110V 250V Vpp On 48VDC line voltage offset for sustained periods of seconds Line Loop Current Off Hook 20 80 mA Return Loss 1000Hz 15 dB 600 Ohm...

Page 23: ...20 Hz Wait Time for Dial tone 2 255 sec Two second default Return loss 1000Hz 30 dB Tr 600 2 16 F Table 11 Summary CH1788 Family of Products Model Summary of Features Operating Temperature CH1788 5V F...

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Page 25: ...NCTION PIN NO FUNCTION 1 A1 12 RING 2 OH 13 TIP 3 RTS 14 V 4 RI 15 V 5 CTS 16 OPEN 6 DSR 17 OPEN 7 DCD 18 S1 8 DTR 19 S2 9 A2 20 VCC 10 TXD 21 GND 11 RST 22 RXD Active Low TOP VIEW SIDE VIEW Downloade...

Page 26: ...and IC Approved or Approvable devices the user assumes all risk for maintaining compliance to registration Printed in U S A 1390 BORREGAS AVENUE SUNNYVALE CA 94089 LOCAL 408 752 5000 TOLL FREE 1 800...

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