Cermetek microelectronics CH2000 Low Profile Full Function 2400 bps Modem 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 0o to 70oC Extended temperature -40oC to 85oC 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. 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. 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. SUPPORTED FEATURES These functions are provided by a monolithic modem integrated circuit. This IC has built-in facilities accomodating integrated AT command control and containing the necessary resident interfaces for general communication and routing to the DAA. AT Command Set. Telephone Line Interface or DAA. Serial Host Interface. 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 requirements 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 1999 Cermetek Microelectronics, Inc. The CH2000 supports a 40-character command line. The command 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. 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 Ω load directly. Typically, the SPK signal is input into an audio power amplifier and the amplifier, inturn, drives a speaker coil. Document No.607-0002 Rev. D (8/99) 1 The speaker is activated with the ATMn command. The speaker volume is adjusted using the ATLn command, where n is 0, 1, 2, or 3. Increasing numbers correspond to higher volume. Figure 5 illustrates one technique of driving an external 8Ω speaker. Phone Control. Cermeteks CH2000 contains a pin called Voice/Data (V/D). The V/D pin toggles high when the modem goes off hook. This pin can be used to activate a relay which can switch a telephone on or off the Tip and Ring incoming PSTN lines. This feature allows any telephone associated with the CH2000 to be disconnected when a data call is in progress, thereby preventing the data from being disturbed by an inadvertent telephone pick-up. See Figure 2. RING TIP TIP RING RJ-11 Jack OPTIONAL PHONE RJ-11 Jack TELEPHONE LINE Table 1. Connection Rates. An sw erin g Mo d em In itial Train ed R ate C o n n ectio n R ate R esu ltin g Wh en C allin g Mo d em In itial Train ed R ate is: 300 1200 2400 300 300 1200 1200 1200 300 1200 1200 2400 300 1200 2400 Speed and Parity Selection. Prior to call initiation, the host controller trains the modem to the host speed (2400, 1200, or 300 bps) and parity (odd, even, mark, space, or none) via a host-initiated training sequence. This training also sets the speed of the data for originate calls. The CH2000 will automatically adjust to the originators speed when answering calls. The CH2000 matches the hosts parity when it returns status messages to the host. During a data connection, however, the modem passes parity through without interpretation or alteration. Ring Indicator (RI). Figure 2. Voice/Data Port Control. Sleep Mode. To minimize power consumption, the CH2000 includes a power down feature called Sleep Mode. When activated, the CH2000 will automatically enter Sleep Mode after 0 to 254 seconds of inactivity. The inactivity delay is selected using the ATS24 command. The CH2000 is delivered from the factory with a 5 second inactivity delay enabled (i.e., ATS24=5). The CH2000 returns to normal operation when a ring signal is received or upon an input low signal on the TXD pin. ATS24 = 255 disables the Sleep Mode and is the default if no value is set in register S24. A SLEEP output signal is available to control power to external devices. In Figure 5, a FET controlled by the SLEEP signal turns off the external speaker amplifier when the CH2000 enters Sleep Mode. In Sleep Mode, power is reduced to approximately 50% of normal operating power. Transmission Speed. In normal operation, the originating modem initiates the call and attempts to connect to the answering modem at a speed established by the originating modems controller prior to call initiation. This is referred to as the Initial Trained Rate. Upon receiving the call, the answering modem will attempt to connect to the originating modem at its Initial Trained Rate. If these two rates are identical, the connection is made. If the speeds differ, the answering modem must adjust its rate or terminate the call. Table 1 indicates the connection rate that will result when the calling modems Inital Trained Rate and the answering modems Initial Trained Rate are different. Note that a 2400 baud connection rate will only result if both modems are initially set at 2400 baud. 1999 Cermetek Microelectronics, Inc. The RI pin toggles low when the CH2000 detects an incoming call. Although not TTL compliant, the RI pin can, nonetheless, be utilized to activate external circuitry including the external RST pin. When using the RI pin, it is recommended that a Schmitt Trigger or the Isolated Envelope Detect Circuit in Figure 4 be placed between the RI pin and the external load. Power Supply. The CH2000 modem module is a complex set of sub-systems. During the course of normal operation the CH2000 decodes analog signals from the telephone line that are in the millivolt range. Steps must be taken by the user to guarantee that power supply noise on all supply lines, including ground, does not exceed 50 mV peak to peak. Any frequency between 20 kHz and 150 kHz must be less than 500 µV peak. If necessary, use dedicated power and ground planes. Failure to provide such operating conditions could cause the CH2000 to malfunction or to function erratically. The CH2000 requires a single +5V ±5% supply. It is recommended that by-pass capacitors be placed on the power supply as close to the modems supply input as practical. It is recommended that a 10 µF Electrolytic capacitor in parallel with a 0.01µF ceramic capacitor be used. WARNING: The CH2000 has been FCC Part 68 approved as a data modem only. Utilization of the Voice/Tone Port requires further registration. FCC will require that the system, including the CH2000 and the handset or DTMF transceiver, adhere to Part 68 rules. MODEM CONTROL The CH2000 modem may be controlled by sending serial ASCII command sequences. The commands are sent to the modem serially on the TXD pin. After execution of a received command, the modem returns a serial status message that can be read on pin RXD. This message indicates command completion status. Refer to Table 3 for a complete list of result codes. Document No. 607-0002 Rev. D (8/99) 2 INITIALIZING THE MODEM Before commands may be sent to the CH2000, the modem must be initialized. This consists of two events: 1) Power-up reset . This is accomplished by applying a hardware reset pulse to pin RST. 2) Initial modem training. The modem must be trained to the hosts speed (2400, 1200, 300bps) and parity (odd, even, mark, space or none). ENABLE RXA MECHANICAL RELAY ONLY. A ZERO IMPEDANCE SWITCH MAY REPLACE THE RELAY AND TRANSISTOR CIRCUIT. +5V 4.7K 2N2222 1N914 +15V 1 RING 2 TIP 20K CH2000 3 AXT 4 + 20K A 1 B 499 2 TL064 2.2uF nonpolar 0.1uF 0.1uF 82K 0.1uF 20K These activities are briefly described below. 63.4K 7 RXA 8 DTR 9 NC 10 V/D 11 RST 12 RI 13 NC 14 DSR VOICE OR DTMF SIGNAL 16 TXD 17 NC Power-up Reset. R1 After applying power to the CH2000, the CH2000 generates an internal reset pulse. The user can also reset the modem externally by applying a high-going reset pulse to the RST pin for at least 10ms after the +5V power supply has stabilized. Delay sending commands to CH2000 for 200ms after Power-up reset has been initiated to allow the CH2000 to properly reset. 15 NC 20K 54K NC 34 GND 33 VCC 32 RXD NC NC 31 30 29 NC SPK NC NC NC NC 28 27 26 25 24 23 HS 22 18 NC DCD 21 19 SLEEP GND 20 6 - 7 5 AXR 0.1uF 11 + 28K R2 TL064 0.1uF Training the Modem. Each modem must be trained to match its hosts speed and parity so that it is able to recognize serial asynchronous commands sent to it by the host UART. The host must retrain the modem each time a reset signal is applied on RST or after a RESET serial command has been issued. ADJUST R2 FOR THE DESIRED LEVEL OF AXT VOICE TO BE ECHOED TO AXR. DECREASE RECEIVE GAIN SIGNAL AXR BY DECREASING VALUE OF R1. Figure 3. Voice/Tone Injection. RING ANALOG VOICE INJECTED SIGNALS RXA TXA RJ-11 JACK TIP TELEPHONE LINE VOICE/DATA SPK CH2000 V.24 EIA-232-D INTERFACE OR USART OPTIONAL PHONE CONTROL RELAY SPEAKER CONTROL RXD HS DCD DSR RI CTS TXD DTR EXTERNAL RESET RST +5V GND EARTH GND* Figure 4. CH2000 Application Diagram of Test Circuit. 1999 Cermetek Microelectronics, Inc. Document No.607-0002 Rev. D (8/99) 3 Table 2. CH2000 Pin Descriptions (Continued). P IN N AME I/O F U N C T ION 20 GND - G R O U N D . N o t e : N o i s e s ho ul d b e l e s s t ha n 5 0 m V p e a k t o p e a k . 21 ____ DCD O D AT A C A R R I E R D E T E C T o ut p ut . L O W i nd i c a t e s a d a t a c a r r i e r fr o m a r e m o t e m o d e m i s d e t e c t e d . D C D fo l l o w s c a r r i e r i s t he d e fa ul t . 22 __ HS O S P E E D I N D I C AT I O N . H i g h s p e e d s e l e c t o ut p ut . A L O W o n t hi s p i n i nd i c a t e s t he m o d e m i s o p e r a t i ng a t 2 4 0 0 b p s . 23 NC - N o c o nne c t i o n. 24 NC - N o c o nne c t i o n. 25 NC - N o c o nne c t i o n. 26 NC - N o c o nne c t i o n. 27 SPK O S P E A K E R . A ud i o O ut p ut . S e e F i g ur e 5 . 28 NC - N o c o nne c t i o n. 29 NC - N o c o nne c t i o n. 30 NC - N o c o nne c t i o n. 31 ____ RX D O R E C E I V E D AT A . S e r i a l r e c e i v e d a t a o ut p ut . R e c e i v e d m a r k i ng o r a b i na r y 1 c o n d i t i o n i s i n d i c a t e d b y a H IG H . 32 VCC - P O W E R S U P P L Y . 5 V o l t s + 5 % i s r e q ui r e d . N o t e : N o i s e s ho ul d b e l e s s t ha n 5 0 mV p e a k to p e a k . 33 GND - G R O U N D . N o t e : N o i s e s ho ul d b e l e s s t ha n 5 0 m V p e a k t o p e a k . 34 NC - N o c o nne c t i o n. Notes: (1) (2) (3) (4) (5) If VCC has a slow power up ramp time, the internal reset may be ineffective. I means input only. O means output only. I/O means both input and output possible. NC means no connection. 1999 Cermetek Microelectronics, Inc. Document No. 607-0002 Rev. D (8/99) 4 Modem Training Command Sequence. The CH2000 is trained by sending it the following sequence: Enter: AT[CR] Where: A and T may be either upper or lower case but must be the same case. [CR] repesents carriage return The AT sequence is referred to as an attention sequence. The CH2000 will respond with one of the following status messages, depending on whether it is optioned for abbreviated or English status messages. Result: 0[CR] (Abbreviated form) Result: [CR][LF]OK[CR][LF] (English form) Where: [CR] represents carriage return (ASCII 13 or HEX 0D). [LF] represents line feed (ASCII 10 or HEX 0A). The modem is now in idle mode and is ready to accept commands. An alternate attention sequence A/ may be sent which behaves much like the AT sequence except that it causes the previously entered command specified with an AT prefix to be executed. When given, it must be in upper case ASCII. No carriage return is needed. THE COMMAND FORMAT Typical commands consist of three elements: the attention sequence, the commands themselves, and a terminating carriage return. AT [commands] [CR]. Where: AT represents attention sequence. [commands] represents command strings. [CR] represents carriage return (ASCII 13 or HEX 0D). When entering commands to the modem, the backspace character-control-H (ASCII 8 or HEX 08) can be used to edit mistakes. AT and A/ may not be edited however. Multiple commands may be placed in the command line. A command line may be as long as 40 characters, excluding the letters AT. By way of example, the command below instructs the CH2000 to configure itself to not echo characters when in command mode (E0) and then put itself in answer mode (A). Enter: ATE0A[CR] AT Command Set. The available command set is divided into four types of commands: dial modifiers, basic commands, ampersand and percent commands. Refer to the complete list in Tables 4A, 4B and 4C, 4D respectively. AT Command Data Rate. With the serial interface, the rate is speed sensed for parity and format. THE STATUS MESSAGES The CH2000 responds with a status message after each command is executed. This status message may either be a single digit followed by a carriage return or a carriage return and line feed with a message in English, followed by a carriage return and line feed. by the user. X0 - Result Codes 0, 1, 2, 3, 4 allowed X1 - Result Codes 0, 1, 2, 3, 4, 5, 10 allowed X2 - Result Codes 0, 1, 2, 3, 4, 5, 6, 10 allowed X3 - Result Codes 0, 1, 2, 3, 4, 5, 7, 10 allowed X4 - Result Codes 0, 1, 2, 3, 4, 5, 6, 7, 10 allowed The CH2000 is factory set to X4, which allows all result codes. MODEM STATES The CH2000 can be in either command mode or data mode. When the modem is idle, it is in command mode by default. When data transmission is in progress, the CH2000 is in the data mode state and will not recognize commands. To force the CH2000 to recognize commands, the host must send an escape sequence to the CH2000 forcing it out of data mode and into command mode. The escape sequence consists of a guard time (a period where no characters are sent to the modem), followed by 3 escape characters, followed by another guard time. At power up, the guard time is set to 1 second minimum, and the escape character is set as +. These two parameters can be modified via registers S12 and S2, respectively. The CH2000 will stay off-hook with its carrier on after the escape sequence is received and it returns an OK status message when it is ready to accept commands. The CH2000 can be put into data mode by issuing the command ATO [CR]. Table 3. Summary of Result Codes and Their meanings. Re sult Codes Sta tus Me ssa g e s Me a ni ng 0 OK C o mma nd e xe cute d 1 C ONNE C T C a rri e r d e te cte d a t 300 b p s 2 RING Ri ng d e te cte d 3 NO C A RRIE R D i d no t d e te ct ca rri e r 4 E RROR E ntry e rro r 5 C ONNE C T 1200 C a rri e r d e te cte d a t 1200 b p s 6 NO D IA L TONE Off-ho o k, b ut no re sp o nse a fte r 5 se co nd s 7 B US Y B usy si g na l d e te cte d 10 C ONNE C T 2400 C a rri e r d e te cte d a t 2400 b p s Table 4A. Dial Modifiers and Functions. Dial Modifers Function P R T W ; @ ! , 0-9 A,B,C,D Pulse Dial Originate Call in Answer Mode Touch Tone Dial Wait for Dial Tone Return to Idle State Wait for Quiet Answer Command Flash hook Pause Dial Digits/Characters The basic status code subsets are enabled with the Xn command. Where n=0,1,2,3,4 establishes the result codes allowed 1999 Cermetek Microelectronics, Inc. Document No.607-0002 Rev. D (8/99) 5 Table 4B. CH2000 AT Command Set Summary. CH2000 AT Set Summary Basic Commands AT A A/ *Bn D *E Hn *Ln *Mn On P *Qn Sn Sn= Sn? *Vn *Xn +++ , ? *Yn Fn Z Function Attention Code Answer command Repeat Last Command Communications Standard Option Dial Command Off-Line Character Echo Option Switch Hook Control Option Speaker Volume Option Speaker Control Option On-Line Command Pulse Dial Result Code Display Option Select an S Register Write to an S Register Read an S Register Result Code Form Option Result Code Set/Call Progress Option Escape Code Sequence Pause Returns Last Addressed S Register Long Space Disconnect Option On Line Echo character Option Reset Table 4C. Ampersand Commands. Ampersand Commands Function *&Dn &F *&Gn *&Pn *&Sn &Tn &V *&Wn *Yn *&Zn *&Cn Data Terminal Ready Option Load Factory Defaults Guard Tone Option Make to Break Ratio Selection Data Set Ready Option Test Command Option View Active Configuration Store active profile Recall active profile Store telephone numbers Data Carrier Detect Option *= Commands that can be stored in NVRAM. Table 4D. Percent Commands. Percent Commands Function %Dn DTMF Attenuation %J Load Secondary Factory Defaults NOTE: A detailed definition of all commands and registers is available from Cermetek Microelectronics, Inc. Refer to Cermetek document AT Commands and S-Registers Reference Guide. 1999 Cermetek Microelectronics, Inc. Table 5. CH2000 Register Summary. Register CH2000 Register Summary Function S0* Ring to Answer On S1 Ring Count S2 Escape Code Character S3 Carriage Return Character S4 Line Feed Character S5 Back Space Character S6 Wait For Dial Tone S7 Wait Time for Data Carrier S8 Pause Time for Comma S9 Carrier Detect Response Time S10 Lost Carrier to Hang-up Delay S11 DTMF Dialing Speed S12 Escape Code Guard Time S14* Bit Mapped Options Register S16 Modem Test Options S18* Test Timer S21* Bit Mapped Options Register S22* Bit Mapped Options Register S23* Bit Mapped Options Register S24 Sleep Mode Inactivity Time S25* Delay to DTR S27* Bit Mapped Options Register S28* Bit Mapped Options Register *=S-Registers stored in NVRAM upon receipt of &W command AT COMMAND APPLICATIONS Dialing A Phone Number. The Dial command takes the form Dn, where n is a string of characters. In the simplest form, n will be only the digits of the phone number to be dialed. Example: Dial number. Enter: AT D1234567 In response to this command, the CH2000 dials the telephone number 123-4567 and then waits for a carrier from the distant modem. If no carrier is detected within a given time (the default time is 30 seconds), the CH2000 automatically releases the line and sends a NO CARRIER result code. If a carrier is detected, the CH2000 gives a CONNECT result code and goes on-line, permitting communication with the distant modem. The Dial Command may also be issued without a telephone number. ATD causes the modem to pick up the telephone line without dialing a number. Pause During Dialing. When placing a call from an office with a telephone connected to a PBX, it may be necessary to dial an access code (usually the digit 9) to get an outside line. Inserting a comma in the telephone number instructs the modem to pause for a specific length of time. The factory set default pause time is 2 seconds. Example: Dial 9, pause, dial number. Enter: AT DT9, 1234567 Multiple commas may be used to generate integer multiples of the specified delay time. Document No. 607-0002 Rev. D (8/99) 6 Originate a Call in Answer Mode. The D command forces the modem into originate mode. To call an originate-only modem, dial the number and set the modem to answer mode via the R (reverse originate). This is done by entering the R command at the end of the telephone number. +5V 3 2 G VN0300L S SLEEP Redial Last Number. D 1 Use A/, the repeat command, to redial the last telephone number dialed when a busy signal is received. 10 uf + 16V 6 7 + LM386 2 _ 220 uf 3 SPK Return to Command State. 0.1 uf 0.01 uf The modem can be forced to reenter the command state after dialing (without hanging up) by ending the dial command with a semicolon. This is useful when using the modem as an auto dialer. Example: Touch-tone dial 9, pause, dial number, return for command. Enter: AT DT9, 1234567; Result: OK 4 16V 5 + 1 8 + 10 uf 8 Ohm SPEAKER 1K Figure 5. Speaker Control Circuit--optional to allow for call progress monitoring. Automatic Answering. The S0 register controls the number of rings that must occur before the modem answers a call. The register may range in value from 0-255. S0 = 0 S0 = 1 S0 = 2 S0 = 3 DO NOT ANSWER TELEPHONE ANSWER ON RING 1 ANSWER ON RING 2 ANSWER ON RING 3 S0 = 255 ANSWER ON RING 255 When S0 is set to 0, the modem will not auto-answer. CONNECTING TO THE HOST UART Since a modem communicates data serially and most host products handle data in a parallel format, a UART is needed to make parallel-to-serial and serial-to-parallel translations. PHONE LINE CONNECTION GUIDELINES 1) 2) 3) 4) 5) The Serial Interface Lines. The CH2000 supports a full EIA-232D/V.24 serial interface. Signal levels are TTL rather than EIA-232D level compatible, which allows you to directly connect the modem to your hosts UART without level translating circuitry. See Table 2 for complete pin description. 6) Two of the following three pins are all that are required for proper modem operation: TXD, RXD and DTR. The modem is controlled by sending it serial commands over TXD and can be monitored by serial status messages returned on RXD. DTR is optionally used to reset, terminate calls or return CH2000 to command mode. 8) 7) 9) The CH2000 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 circuitry from the CH2000 to the telephone line interface must be provided in wiring that carries no other circuitry other than that specifically allowed in the FCC rules (such as A and A1 leads). Connection to phone line should be made through an RJ-11 jack. PCB traces from the modems RING and TIP pins to the RJ-11 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. 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. No additional circuitry other than that shown in Figure 6 may be connected between the modem module and the RJ-11 jack. Doing so will invalidate the FCC approval. The CH2000, the RJ-11 jack, the interfacing circuitry and all PCB traces in between, must be contained on a PCB with a 94 V-0 flammability rating. The supplied FCC registration label must be applied visibly on the outside of the product. The products User Manual must provide the user with instructions for connection and use as recommended in Section FCC Registration. All other serial interface lines may be utilized for the convenience of your application but are not required by the CH2000. Unused outputs (from modem) should be left unconnected. Unused inputs should be set to the proper logic level. See Table 2. 1999 Cermetek Microelectronics, Inc. Document No.607-0002 Rev. D (8/99) 7 Figure 6. PSTN Line Interface for CH2000 Products. CH2000 HANDLING AND ASSEMBLY RECOMMENDATIONS The CH2000 contains static-sensitive components and should only be handled by personnel and in areas that are properly protected against static discharge. There are two mounting techniques that are recommended for physically connecting the CH2000 to a PCB: 1) sockets, and 2) direct soldering. Direct Soldering. The CH2000 may be wave soldered onto a circuit card. The CH2000 is hermetically sealed and will not be harmed by industry standard wave soldering processes. Socketing. The socketing approach to mounting eliminates cleaning and desoldering concerns. When the socket is used, it must make a solid connection to all pins. Failure to do so will cause unreliable operation. Also, steps should be taken to assure that the module remains tightly seated in the socket after the end product is shipped. FCC REGISTRATION The CH2000 is registered with the FCC (Federal Communications Commission) under Part 68. To maintain the validity of the registration, you must serve notice to the end user of the product of several restrictions the FCC places on the CH2000 and its use. The following notice is recommended and should be included in the end products user manual. Also, the FCC requires that Cermetek make all repairs to the CH2000. If repairs are necessary after installation of the CH2000 1999 Cermetek Microelectronics, Inc. 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 CH2000 can be removed from the end product and then forwarded to Cermetek for repair. FOR YOUR USERS MANUAL The Part 68 rules require the following (or equivalent) be provided to the end user of equipment containing a DAA: Type of Service: The (insert end product name) is designed to be used on standard device telephone lines. It connects to the telephone line by means of a standard jack called the USOC RJ-11C (or USOC RJ45S). Connection to telephone-company-provided coin service (central office implemented systems) is prohibited. Connection to party lines service is subject to state tariffs. Changes in Attestation Procedure for Plugs and Jacks: (Name of applicant) attests that the network interface plugs or jacks used on this equipment comply with and will continue to comply with the mechanical requirements specified in Part 68, Sub-part F, specifically the dimensions, tolerances and metallic plating requirements. The compliance of these connectors will be assured by purchase specifications and incoming inspection. Documentation of such specifications and/or inspections will be provided by the FCC within 30 days of their request for the same. Telephone Company Procedures: The goal of the telephone company is to provide you with the best service it can. In order to do this, it may occasionally be necessary for them to make changes in their equipment, operations or procedures. If these changes might affect your service or the operation of your equipment, the telephone company will give you notice, in writing, to allow you to make any changes necessary to maintain uninterrupted service. Document No. 607-0002 Rev. D (8/99) 8 Table 6. CH2000 System Data Mode Compatibility Specifications P arameter S p ecificatio n P a ra m e t e r S p ecificatio n 2400Hz + 7Hz 1200Hz + 7Hzz Asynchronous 2400, 1200, 600 bps character asynchronous. 0-300 bps asynchronous Recei ve Carri er Frequenci es V.22 bi s, V.22, 212A Ori gi nate Answer Asynchronous Speed Range TXD may di ffer +1%, -2.5% from modem output. Offsets wi ll be corrected by addi ng/deleti ng stop bi ts. Bell 103 Answer 'space' Answer 'mark' Ori gi nal 'space' Ori gi nal 'mark' Asynchronous Format 8, 9, 10 bi ts, i ncludi ng start, stop, pari ty Recei ver Sensi ti vi ty OFF to ON threshold-43 dBm ON to OFF threshold-48 dBm Telephone Li ne Interface Two-wi re full duplex over publi c swi tched network. On-chi p hybri d and bi lli ng delay ti mers. Bi lli ng Delay 2.0 to 3.0 seconds (Ta=25OC) Modulati on V.22 bi s, 16 poi nt QAM at 600 baud. V.22 and 212A, 4 poi nt, DPSK at 600 baud. 103 bi nary phase coherent FSK. Hysteresi s Self Test Pattern Generator Alternate 'ones' and 'zeros' and error detector, to be used along wi th most loopbacks. A number i ndi cati ng the bi t errors detected i s sent to DTE. Li ne Equali zati on Fi xed compromi se equali zati on, transmi t. Adapti ve equali zer for PSK/QAM, recei ve. Di agonosti cs Avai lable Local analog loopback. Local di gi tal loopback. Remote di gi tal loopback. Request remote di gi tal loopback. Local i nterface loopback modem wi th self test. Transmi t Carri er Frequenci es V.22 bi s, V.22, 212A Bell 103 mode Ori gi nate Answer 1200Hz + 0.1% 2400Hz + 0.1% Ori gi nate 'space' Ori gi nate 'mark' Answer 'space' Answer 'mark' 1070Hz + .01% 1270Hz + .01% 2020Hz + .01% 2225Hz + .01% Call Progress Tones Detected Computer Interface In certain circumstances, it may be necessary for the telephone company to request information from you concerning the equipment 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 should be less than five in order to assure proper service from the telephone company. In some cases, a sum of five may not be useable. Consult your local telephone service provider. 2020Hz + 7Hz 2225Hz + 7Hz 1070Hz + 7Hz 1270Hz + 7Hz 2 dB mi ni mum Wi th speaker or qui et screen messages (no di al tone, busy, ri ng-back, modem answer tone and voi ce). IBM PC/XT/AT bus compati ble wi th an 8250/16450/16550A UART as a seri al controller. In the event repairs are ever needed on the (insert your product name), they should be performed by (insert your company name) or an authorized representative of (insert your company name). For information contact: (insert your company address). If Problems Arise: If any of your telephone equipment is not operating properly, you should immediately remove it from your telephone line, as it may cause harm to the telephone network. If the Telephone Company notes a problem, they may temporarily discontinue service. When practical, they will notify you in advance of this disconnection. If advance notice is not feasible, you will be notified as soon as possible. When you are notified, you will be given the opportunity to correct the problem and informed of your right to file a complaint with the FCC. Contact your local telephone service provider if you have any questions about your phone line. 1999 Cermetek Microelectronics, Inc. Document No.607-0002 Rev. D (8/99) 9 Table 7. CH2000 Electrical Specifications. Ta=25OC S ymb o l V cc Icc V OL V OH V IL IIN, ILO C h a ra c t e ris t ic S up p ly vo lta g e M in . Ty p . M ax. U n it s 4.75 5.0 5.25 V 50 40 16 75 mA mA mA 0.4 0.26 --- V V S up p ly C urre nt Off ho o k o p e ra ti ng curre nt On ho o k o p e ra ti ng curre nt P o we r d o wn o p e ra ti ng curre nt Outp ut Lo w Vo lta g e ____ ___ __ ___ (IOL=1.6mA ) S LE E P, D S R, D C D , HS , RX D o nly (IOL=4mA ) V /D RI (S e e No te 1) Outp ut Hi g h Vo lta g e ____ ___ __ ___ (IOH=-100uA ) S LE E P, D S R, D C D , HS , RX D (IOH=-4mA ) V /D RI (S e e No te 1) --2.4 4.18 --- --- --- --- V V Inp ut Lo w Vo lta g e D TR, TX D RX D 0.8 0.95 V V Inp ut Le a ka g e C urre nt TX D , D TR, ______ ____ ____ ___ RX D , RS T, S LE E P, D S R, D C D , HS 100 10 uA uA 10 pF CP C a p a ci ti ve Lo a d TX D , D TR, RX D V IH Inp ut Hi g h Vo lta g e D TR, TX D RX D 2.4 3.3 V V V T+ RS T (P o si ti ve Hyste re si s Thre sho ld fo r Re se t p i n) 2.7 V V T- RS T (Ne g a ti ve Hyste re si s Thre sho ld fo r Re se t p i n) 1.6 V Note 1: The RI signal can drive a 74HC14 directly to detect ringing over the US ring voltage range. The CH2000 has an internal 30K Ω pullup resistor on the RI signal. Adding an external pullup resistor to RI will decrease the ring detect sensitivity at low ring voltages. Use of the RI signal to detect a ring is not required as the modem can be instructed to automatically answer a ring. If TTL compliance is required when used to activate external circuitry, Cermetek recommends using a Schmitt Trigger or the Envelope Detect Circuit in Figure 4. DEFAULT STATUS, PERFORMANCE, AND SPECS The following is a summary of the Default Configuration Profile installed by Cermetek Microelectronics, Inc., prior to delivery of the CH2000. Async mode selected 2400bps Bell 212A operation at 1200bps Even parity Auto answer disabled Command echo ON All result codes enabled extended Wait for dial tone before dialing = 2 seconds Detects busy signal Full word result codes Pulse dial make/break ratio = 39/61 DSR enabled Modem enabled DTR DCD enabled Speaker enabled but off when receiving carrier Speaker volume set to medium Local modem will grant RDL request from remote modem Guard tones disabled Minimum DTR pulse width = 0.1 seconds Ring count = 01 1999 Cermetek Microelectronics, Inc. Escape code character = 43 Carriage return character = 13 Line feed character = 10 Back space character = 8 Duration of wait for dial tone = 2 seconds Duration of wait for carrier after dialing = 30 seconds Duration of deal pulse (comma) = 2 seconds Carrier detect response time = 0.1 seconds Escape code guard time = 1 second Length of use after comma = 2.0 seconds Last carrier to hang up delay = 0.1 seconds DTMF interdigit delay = 0.1 seconds DTMF Attenuation = -4dB Sleep mode inactivity time = 5 seconds Long space disconnect disabled Document No. 607-0002 Rev. D (8/99) 10 Table 8. CH2000 Electrical Specifications P a ra m e te r M in im u m Ri ng Vo lta g e S e nsi ti vi ty Ty p ic a l M a x im u m U n its 40 V RMS Re turn Lo ss @ 1000 Hz 17 Ri ng Fre q ue nci e s C o m m e n ts dB 15.3 68 Tra nsmi t Le ve l 600 o hm Hz -12 dBm 600 o hm - D a ta Mo d e C o mma nd Mo d e A fte r Re se t 200 mse c D e la y Inte r C ha ra cte r D e la y 20 mse c B e twe e n a ll co mma nd cha ra cte rs C o mma nd D e la y 100 mse c B e twe e n a ll AT co mma nd s Mi ni mum Re se t P ulse 10 mse c If use r sup p li e d RX A Tra nsmi ssi o n Inse rti o n Lo ss -1.5 dBV Me a sure d fro m A X T to Ti p /Ri ng p e r Fi g ure 3 RX A Re ce i ve r Inse rti o n Lo ss -1.0 dBV Me a sure d fro m Ti p /Ri ng to A X R p e r Fi g ure 3 S P K A ud i o Outp ut wi th D C re fe re nce o f 2.5V +20mV 3.2 V pp Me a sure d wi th 300 o hm, 0.01uF lo a d Table 9. Other Performance Specifications P arameter Min imu m DTMF Twist (Balance) Typ ical Maximu m U n its 3 DTMF Tone Duration 50 Pulse Dialing Rate 10 C o m m e n ts dB 255 ms 95 ms default 20 pps 10pps default Pulse Dialing Make/Break 39/61 % US, Canada default Pulse Dialing Make/Break 33/67 % UK, Hong Kong 789 ms default Pulse Interdigit Interval 700 3000 ms Call Progress Passband Frequency 120 620 Hz 2 255 sec Wait Time for Dial Tone Two seconds default Table 10. Analog Characteristics Name Type Characteristic SPK O (DF) Minimum Load 300 Ω Maximum Capacitive Load 0.01µF Output Impedance 10 Ω Output Voltage 2.5 + 1.6V D.C. Offset <20mV (with reference to 2.5V nominal) 1999 Cermetek Microelectronics, Inc. Value Document No.607-0002 Rev. D (8/99) 11 Table 11. Summary of CH2000 Product Family Options. M o d el S u mmary o f F eatu res CH2000 Full Functi o n, NVRAM, FCC Pa rt 68 Ap p ro ve d , He rme ti c CH2000ET Full Functi o n, + Exte nd e d Te mp e ra ture Pe rfo rma nce , NVRAM, FCC Pa rt 68 a p p ro ve d , He rme ti c Notes: 1. 2. 3. 4. 5. Op eratin g Temp eratu re 0o to 70oC -40oC to +85oC All dimensions are in inches. Case dimensions are nominal + 0.02 inches. Pin length is nominal + 0.03 inches. Cermetek reccomends that 0.040 inch diameter plated through holes are used with 0.060 inch diameter pads. Pin spacings are nominal. Figure 7. CH2000 Physical Dimensions and Pin Functions. Cermetek microelectronics 406 TASMAN DRIVE . SUNNYVALE, CALIFORNIA 94089 . TEL: (408) 752-5000 FAX: (408) 752-5004 E-mail: [email protected] Website: www.cermetek.com Cermetek reserves the right to make changes in specifications at any time and without notice. The information furnished by Cermetek in this publication is believed to be accurate and reliable. However, no responsibility is assumed by Cermetek for its use, or for any infringements of patents or other rights of third parties resulting from its use. No license is granted under any patents or patent rights of Cermetek. Printed in U.S.A. 1999 Cermetek Microelectronics, Inc. Document No. 607-0002 Rev. D (8/99) 12