Specifications

ManualsBrandsSilicon Laboratories ManualsModemSI2494/39

Ordering Information

This data sheet is valid only for

those chipset combinations listed

on page 59.

Pin Assignments

N/C

GPIO24, D4

GPIO25, D3

GPIO16, D2

GPIO17, D1

GPIO18, D0

INT

CLKIN/XTALI

XTALO

N/C

EECLK

VDD

ESC, D5

DCD, D6

GND

N/C

RTS, SS, D7

TXD, MOSI, WR

RXD, MISO, RD

CTS, SCLK, CS

C1A

C2A

AOUTb

EECS

FSYNC

CLKOUT

VDD

GND

RESET

SDI

SDO

EESDI

EESDO

Si2494/39

5 x 7 mm

QFN

19181716151413

GPIO1

GPIO11, A0

VREG

AOUT

37 36 35 34 33 32

DCT

C1B

C2B

VREG

RNG1

RNG2

VREG2

QE2

DCT3

IGND

DCT2

Si3018

Si2494/39

V.92 AND V.34 ISOMODEM

WITH GLOBAL DAA

Features

Applications

Description

The Si2494/39 ISOmodem is a full-featured ITU V.92/V.34-compliant modem that

provides connect rates of up to 56 kbps, full-duplex, over the public switched

telephone network (PSTN). Offered as a chipset with the Si2494/39 system-side

device and the Si3018 line-side device, the ISOModem utilizes Silicon

Laboratories’ patented direct access arrangment (DAA) technology to provide a

programmable telephone line interface with an unparalleled level of integration.

This compact solution eliminates the need for a separate DSP, modem controller,

codec, transformer, relay, opto-isolators, clocking crystal, and 2-4 wire hybrid. The

addition of the Si3000 voice codec supports a voice handset and/or full-duplex

speakerphone. Voice pass-through with optional compression supports tapeless

answering machine, music-on-hold, voice menus, etc. The Si2494/39 is ideal for

embedded modem applications due to its flexibility, small footprint, and minimal

external component count.

System Block Diagram

 Data modem formats

ITU-T, Bell

300 bps up to 56 kbps

V.21,V.22, V.29 Fast Connect

V.44, V.42, V.42bis, MNP2-5

Automatic rate negotiation

V.92 PCM upstream

V.92 Quick connect

V.92 Modem on hold

 Type I and II caller ID decode

 No external ROM or RAM required

 UART, SPI, or parallel interface

 Flexible clock options

Low-cost 32.768 kHz oscillator

4.915 MHz oscillator

27 MHz clock input

 Integrated DAA

Over 6000 V capacitive isolation

Parallel phone detect

Globally-compliant line interface

Overcurrent detection

 AT command set support

 SMS / MMS support

 Firmware upgradeable

 EEPROM interface

 Commercial or industrial

temperature range

 DTMF detection/generation

 Si3000 Voice Codec Interface

Hardware support for mic,

speaker, and/or handset

Programmable voice filters,

limiters, and sidetone

Supports TBR-38, TIA/EIA-

4790 and other voice

standards

 Voice pass through with

compression

Supports telephone

answering machine, music

on hold, voice menus, etc

 Full-duplex speakerphone

support

Line echo cancellation

Acoustic echo cancellation

 Point-of-sale terminals

 Security

 Medical

 Remote monitoring

Host

CPU

Host Interface Telco

Si3018

Line

Side

Global

DAA

BOM

Tip

Ring

UART

SPI

Parallel

Capacitive

Isolation Barrier



Si2494

System

Side

Summary of content (70 pages)

PAGE 1
Si2494/39 V. 92 A N D V.
PAGE 2
Si2494/39 2 Rev. 1.
PAGE 3
Si2494/39 TABLE O F C ONTENTS Section Page 1. Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5 2. Typical Application Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 3. Bill of Materials: Si2494/39 Chipset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 4. Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PAGE 4
Si2494/39 11. Package Outline: 38-Pin QFN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .63 12. 38-Pin QFN Land Pattern . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .65 13. Package Outline: 16-Pin SOIC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66 14. 16-Pin SOIC Land Pattern . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PAGE 5
Si2494/39 1. Electrical Specifications Table 1. Recommended Operating Conditions Symbol Test Condition Min2 Typ Max2 Unit Ambient Temperature TA F-grade G-grade 0 –40 25 25 70 85 °C Si2494/39 Supply Voltage, Digital3 VD 3.0 3.3 3.6 V Parameter1 Notes: 1. The Si2494/39 specifications are guaranteed when the typical application circuit (including component tolerance) and any Si2494/39 and any Si3018 are used. See "2. Typical Application Schematic" on page 12. 2.
PAGE 6
Si2494/39 Table 3. AC Characteristics (VD = 3.0 to 3.6 V, TA = 0 to 70 °C for F-grade, Fs = 8 kHz, TA = –40 to 85 °C for G-grade) Parameter Symbol Sample Rate Test Condition Fs Clock Input Frequency FXTL default Min Typ Max Unit — 8 — kHz — 4.9152 — MHz Mode1 — 27 — MHz Clock Input Frequency FXTL 27 MHz Clock Input Frequency FXTL 32 kHz Mode1 — 32.
PAGE 7
Si2494/39 Table 4. Loop Characteristics (VD = 3.0 to 3.
PAGE 8
Si2494/39 Table 5. Switching Characteristics1 (VD = 3.0 to 3.6 V, TA = 0 to 70 °C for F-grade, TA = –40 to 85 °C for G-grade) Parameter Symbol Min Typ Max Unit 2.048 — 49.152 MHz tBD –1 — 1 % RESET to RESET tRS 5.
PAGE 9
Si2494/39 Table 5. Switching Characteristics1 (Continued) (VD = 3.0 to 3.6 V, TA = 0 to 70 °C for F-grade, TA = –40 to 85 °C for G-grade) Parameter Symbol Min Typ Max Unit tSCK 224 — — ns tNSS_INACT 81 — — ns SCLK cycle time Inactive time between SS actives Notes: 1. All timing is referenced to the 50% level of the waveform. Input test levels are VIH = VD – 0.4 V, VIL = 0.4 V. 2. With 32.
PAGE 10
Si2494/39 SS T T SE T CKL SD SCLK* T CKH T T SIS SIH MOSI T T SEZ T SOH SDZ MISO Figure 2. SPI Slave Timing t CSS t CSH t AS t AH CS A0 ADDRESS = 0 or 1 t RC t RL RD t DZ t RLDD D[7:0] t DH VALID DATA VALID DATA t RLDD Figure 3. Parallel Interface Read Timing 10 Rev. 1.
PAGE 11
Si2494/39 t CSS t CSH t AS t AH CS A0 ADDRESS = 0 or 1 tW L tW C WR t W DSU t DH D[7:0] VALID DATA VALID DATA Figure 4. Parallel Interface Write Timing CS A0 ADDRESS = 0 or 1 WR tWRC RD tWDSU D[7:0] tDH VALID DATA VALID DATA tRLDD Figure 5. Parallel Interface Write Followed by Read Timing Rev. 1.
PAGE 12
ESC DCDb RTSb TXD RXD CTSb RIb 16 20 34 33 32 31 30 29 28 24 23 22 21 19 INTb RESETb 35 15 14 10 11 12 13 EESDI EESDO EECS EECLK AOUT AOUTb 2 3 8 9 FSYNCH CLKOUT SDI SDO 4 27 38 1 U1 Si2493 C2A C1A VREG RESET_ AOUT AOUTb GPIO11/A0 GPIO18/D0 GPIO17/D1 GPIO16/D2 CLKIN/XTALI GPIO25/D3 GPIO24/D4 EC/D5 DCD_/D6 XTALO UART_RTS_/SPI_CS_/D7 UART_TXD/SPI_MOSI/WR_ UART_RXD/SPI_MISO/RD_ UART_CTS_/SPI_SCLK/CS_ RIb INT_ EESDI EESDO EECS EECLK FSYNCH_ CLKOUT SDI SDO NC1 NC2 NC3 GPIO1 26 VDD 5
PAGE 13
Si2494/39 3. Bill of Materials: Si2494/39 Chipset Component Value Supplier(s) C1, C2 33 pF, Y2, X7R, ±20% Panasonic, Murata, Vishay C3 10 nF, 250 V, X7R, ±20% Venkel, SMEC C4 1.0 µF, 50 V, Elec/Tant, ±20% Panasonic C5, C6, C50, C52 0.1 µF, 16 V, X7R, ±20% Venkel, SMEC C7 2.7 nF, 50 V, X7R, ±20% Venkel, SMEC C8, C9 680 pF, Y2, X7R, ±10% Panasonic, Murata, Vishay C10 0.01 µF, 16 V, X7R, ±20% Venkel, SMEC C40 C41 4.9152 MHz: 33 pF, 16 V, NPO, ±5% 32.
PAGE 14
Si2494/39 Table 8. Protocol Characteristics 14 Item Specification Data Rate (downstream) 56 kbps 54.666 kbps 53.333 kbps 52 kbps 50.666 kbps 49.333 kbps 48 kbps 46.666 kbps 45.333 kbps 44 kbps 42.666 kbps 41.333 kbps 40 kbps 38.666 kbps 37.333 kbps 36 kbps 34.666 kbps 33.333 kbps 32 kbps 30.666 kbps 29.333 kbps 28 kbps ITU-T V.90 ITU-T V.90 ITU-T V.90 ITU-T V.90 ITU-T V.90 ITU-T V.90 ITU-T V.90 ITU-T V.90 ITU-T V.90 ITU-T V.90 ITU-T V.90 ITU-T V.90 ITU-T V.90 ITU-T V.90 ITU-T V.90 ITU-T V.90 ITU-T V.
PAGE 15
Si2494/39 Table 8. Protocol Characteristics (Continued) Item Specification Data Rate 33.6 kbps 31.2 kbps 28.8 kbps 26.4 kbps 24.0 kbps 21.6 kbps 19.2 kbps 16.8 kbps 14.4 kbps 12.0 kbps 9600 bps 7200 bps 4800 bps 2400 bps 1200 bps 300 bps 300 bps ITU-T V.34 ITU-T V.34 ITU-T V.34 ITU-T V.34 ITU-T V.34 ITU-T V.34 ITU-T V.34 ITU-T V.34 ITU-T V.34 or V.32bis ITU-T V.34 or V.32bis ITU-T V.34 or V.32bis ITU-T V.34 or V.32bis ITU-T V.34 or V.32bis ITU-T V.34, IV.32 bis, or V.22bis ITU-T V.22bis, V.
PAGE 16
Si2494/39 Table 8. Protocol Characteristics (Continued) Item Transmit Carrier V.92 V.90 V.34 ITU-T V.32bis ITU-T V.32 ITU-T V.29 ITU-T V.22, V.22bis/Bell 212A Originate mode Answer mode ITU-T V.21 Originate mode Answer mode Bell 103 Originate mode Answer mode Specification As specified by ITU-T As specified by ITU-T As specified by ITU-T 1800 Hz ±0.01% 1800 Hz ±0.01% 1700 Hz ±1 Hz 1200 Hz ±0.
PAGE 17
Si2494/39 Table 8. Protocol Characteristics (Continued) Item Specification Phone Types 500 (rotary dial), 2500 (DTMF dial) Dialing Pulse and Tone DTMF Output Level Per Part 68 Pulse Dial Ratio Make/Break: 39/61% Ring Cadence On 2 seconds; Off 4 seconds Call Progress Monitor BUSY CONNECT (rate) NO ANSWER NO CARRIER NO DIALTONE OK RING RINGING Rev. 1.
PAGE 18
Si2494/39 4. Functional Description XTI CS WR RD A0 D0-D7 MISO MOSI SCLK SS UART Interface Data Bus C1 DAA Interface C2 Si3018/10 EEPROM Interface DSP EESD EECLK EECS RXD TXD CTS RTS DCD ESC RI XTO PLL Clocking Controller CLKOUT To Phone Line AOUT Parallel Interface ROM Program Bus RAM SPI Interface INT RESET Figure 7.
PAGE 19
Si2494/39 This device is ideal for embedded modem applications due to its small board space, low power consumption, and global compliance. The Si2494/39 solution includes a silicon DAA using Silicon Laboratories’ proprietary thirdgeneration DAA technology. This highly-integrated DAA can be programmed to meet worldwide PTT specifications for ac termination, dc termination, ringer impedance, and ringer threshold.
PAGE 20
Si2494/39 4.2. Command Mode Upon reset, the ISOmodem® is in command mode and accepts “AT” commands. An outgoing modem call can be made using the “ATDT#” (tone dial) or “ATDP#” (pulse dial) command after the device is configured. If the handshake is successful, the modem responds with the response codes detailed in Table 14 on page 49 and enters data mode. 4.3.
PAGE 21
Si2494/39 4.8. Low-Power Modes The Si2494/39 provides multiple low power modes. Using the S24 S-register, the Si2494/39 can be set to automatically enter sleep mode after a pre-programmed time of inactivity with either the DTE or the remote modem. The sleep mode is entered after (S24) seconds have passed since the last DTE activity, after the transmit FIFO is empty, and after the last data are received from the remote modem.
PAGE 22
Si2494/39 Table 9. V.253 Event Reporting in Voice Mode Event Description Reporting +VLS Caller Id Report Complex 0,4,20,21 Distinctive Ringing Complex 0,4,20,21 R 0,4,20,21 1-9,A-D,*,# 1,5,20,21 Facsimile Calling (e.g. 1100 Hz) c 1,5,20,21 Data Calling (e.g.
PAGE 23
Si2494/39 4.15. Caller ID Operation The Si2494/39 supports full type I and type II caller ID detection and decode. Caller ID is supported for the US Bellcore, European ETSI, UK, and Japanese protocols and is enabled via the +VCID, +VCDT, and +PCW commands. 4.16. Parallel Phone Detection The ISOmodem® is able to detect when another telephone, modem, or other device is using the phone line.
PAGE 24
Si2494/39 Overload 30 25 CTR21 only 20 LVCS BITS 15 10 5 0 0 3 6 9 12 15 18 21 24 27 30 33 36 39 42 45 48 51 54 57 60 63 66 69 72 75 78 81 84 87 90 93 140 Loop Current (mA) Figure 9. Loop Current 4.17. Overcurrent Detection The Si2494/39 includes an overcurrent detection feature that measures the loop current at a programmable time after the Si2494/39 goes off-hook. This allows the Si2494/39 to detect if it is connected to an improper telephone line.
PAGE 25
Si2494/39 4.21. SMS/MMS Support Short Message Service (SMS) is a service that allows text messages to be sent and received from one telephone to another via an SMS service center. Multimedia Messaging Service (MMS) extends the core SMS capability to send messages that include multimedia content. The Fax ISOmodem provides an interface that offers a great deal of flexibility in handling multiple SMS standards.
PAGE 26
Si2494/39 4.26. EEPROM Interface The Si2494/39 supports an optional serial peripheral interface (SPI) bus serial EEPROM Mode 3 with a 16-bit (8– 64 kbit range) address. The EEPROM is intended first for setting custom defaults, second for automatically loading firmware upgrades, and third to allow for user-defined AT command macros for use in custom AT commands or country codes. See AN93 for complete details. 4.27. AT Commands At powerup, the Si2494/39 is in the AT command mode.
PAGE 27
Si2494/39 Table 10. Basic AT Command Set (Command Defaults in Bold) Command Action $ Display AT command mode settings. A Answer incoming call A/ Dn Re-execute last command. This is the only command not preceded by “AT” or followed by a .
PAGE 28
Si2494/39 Table 10. Basic AT Command Set (Command Defaults in Bold) (Continued) Command H0 Go on-hook (hang up modem). H1 Go off-hook. In Identification and checksum. I0 I1 Display Si2494/39 revision code. A: Revision A Display Si2494/39 firmware revision code (numeric). I7 Display line-side revision code. 18F=Si3018 revision F Display the ISOmodem® model number. “2494” = Si2494 “2439” = Si2439 Diagnostic results 1. See “AN93: ISOModem® Chipset Family Designer’s Guide” for details.
PAGE 29
Si2494/39 Table 10. Basic AT Command Set (Command Defaults in Bold) (Continued) Command Action Vn Result code type (see Table 14 on page 49). V0 Numeric result codes. V1 Verbal result codes Xn X0 X1 Call Progress Monitor (CPM)—This command controls which CPM signals are monitored and reported to the host from the Si2494/39. (See Table 14 on page 49.) Basic results; disable CPM—Blind dial (does not wait for dial tone). CONNECT message does not include speed. Extended results; disable CPM—Blind dial.
PAGE 30
Si2494/39 Table 10. Basic AT Command Set (Command Defaults in Bold) (Continued) Command Action *Y[sequence] Special Access Mode—This command enables special modes and data memory access. Description [sequence] 254:Waaaa,dddd Write hexadecimal data value dddd to hexadecimal data address aaaa. Only one 254:W command per line. 254:Qaaaa Read hexadecimal address aaaa. Returns hexadecimal data value dddd. Only one 254:Q command per line. 2 Enable continuous answer tone for the ATA command.
PAGE 31
Si2494/39 Table 10. Basic AT Command Set (Command Defaults in Bold) (Continued) Command Action Controls V.44 data compression function. A Direction 0 No compression 1 Transmit only +DS44 Options 2 Receive only +DS44 = A 3 Both Directions +DS44 = A,B B Compression_negotiation +DS44 = A,B,C 0 Do not disconnect if V.44 is not negotiated. 1 Disconnect if Rec. V.42 is not negotiated. C Capability 0 Stream method Enable synchronous access mode.
PAGE 32
Si2494/39 Table 10. Basic AT Command Set (Command Defaults in Bold) (Continued) Command +FRM = X +FTM = X 32 Action Class 1 Receive Carrier for V.29 fast connect. X Mode 2 Transmit V.21 (980 Hz) tone for longer than 100 ms, then send answer tone (2100/2225 Hz) for 200 ms. 95 V.29 short synchronous. 96 V.29 full synchronous. Class 1 Transmit Carrier for V.29 fast connect. X Mode 2 Transmit V.21 (980 Hz) tone. 53 Same as &T4, but transmit V.29 7200 bps. Data pattern set by S40 register.
PAGE 33
Si2494/39 Table 10. Basic AT Command Set (Command Defaults in Bold) (Continued) Command +GCI = X Action Country settings - Automatically configure all registers for a particular country.
PAGE 34
Si2494/39 Table 10. Basic AT Command Set (Command Defaults in Bold) (Continued) Command +IFC Options +IFC = A +IFC = A,B +ITF Options +ITF = A +ITF = A,B +ITF = A,B,C 34 Action Specifies the flow control to be implemented. A Specifies the flow control method used by the host to control data from the modem 0 None 1 Local XON/OFF flow control. Does not pass XON/XOFF character to the remote modem.
PAGE 35
Si2494/39 Table 10. Basic AT Command Set (Command Defaults in Bold) (Continued) Command Action Modulation Selection. A Preferred modem carrier V21 ITU-T V.21 V22 ITU-T V.22 V22B ITU-T V.22bis V32 ITU-T V.32 +MS Options V32B ITU-T V.32bis +MS = A V34 ITU-T V.34 +MS = A,B V90 ITU-T V.90 +MS = A,B,C V92 ITU-T V.
PAGE 36
Si2494/39 Table 10. Basic AT Command Set (Command Defaults in Bold) (Continued) 36 Command Action +PMHR=X Initiate MOH. Requests the DCE to initiate or to confirm a MOH procedure. Valid only if MOH is enabled. X Mode 0 V.92 MOH request denied or not available. 1 MOH with 10 s timeout granted. 2 MOH with 20 s timeout granted. 3 MOH with 30 s timeout granted. 4 MOH with 40 s timeout granted. 5 MOH with 1 min. timeout granted. 6 MOH with 2 min. timeout granted. 7 MOH with 3 min. timeout granted.
PAGE 37
Si2494/39 Table 10. Basic AT Command Set (Command Defaults in Bold) (Continued) Command +VCDT = X +VCID = X +VCIDR? Action Caller ID Type. X Mode 0 After ring only 1 Always on (Recommended Setting) 2 UK 3 Japan Caller ID Enable. X Mode 0 Off 1 On—formatted 2 On—raw data format Type II caller ID information — The Si2494/39 will display “+VCDIR:” followed by raw caller ID information including checksum. +VDR = n Distinctive Ring. n Mode 0,x Disable distinctive ring 1,0 Enable distinctive ring.
PAGE 38
Si2494/39 Table 10. Basic AT Command Set (Command Defaults in Bold) (Continued) Command Action +VLS = n Analog Source / Destination Select. n Description 0 ISOmodem on-hook. AOUT disabled. Tone detectors disabled. Si3000 sample pass-through to DAA is inactive. 1 ISOmodem off-hook. AOUT disabled. Tone detectors disabled. 4 ISOmodem on-hook. AOUT connected to ISOmodem tone generators. Tone detectors disabled. 5 ISOmodem off-hook. AOUT connected to PSTN. Tone detectors enabled.
PAGE 39
Si2494/39 Table 10. Basic AT Command Set (Command Defaults in Bold) (Continued) Command Action +VRX Receive Voice Stream. Enable DTE receive of voice stream. The DCE will return a CONNECT response followed by the voice stream as defined by the +VSM command. The DTE can issue a or sequence to terminate the receive stream. The DCE will return a followed by an OK response for and followed by an OK response for .
PAGE 40
Si2494/39 Table 10. Basic AT Command Set (Command Defaults in Bold) (Continued) Command Action +VTS = [, , ] DTMF and Tone Generation. This command can be used to produce DTMF tones, single-frequency tones, and doublefrequency tones. Note that the bracket characters are required for correct operation. Frequency one, which has a range of 0, 200-3200 Hz. Frequency two, which has a range of 0, 200-3200 Hz. Duration of the tone(s) in 10 ms units.
PAGE 41
Si2494/39 4.28. Extended AT Commands The extended AT commands are supported by the Si2494/39 and are described in Tables 11 through 13. Table 11. Extended AT& Command Set (Command Defaults in Bold) Command &$ Action Display AT& current settings. &D0 ESC is not used &D1 ESC escapes to command mode from data mode if also enabled by HES U70, bit 15. &D2 ESC assertion during a modem connection causes the modem to go on-hook and return to command mode.
PAGE 42
Si2494/39 Table 11. Extended AT& Command Set (Command Defaults in Bold) (Continued) Command 42 Action &H2 V.34 with automatic fallback (33.6 kbps to 300 bps) &H3 V.34 only (33.6 kbps to 2400 bps) &H4 ITU-T V.32bis with automatic fallback (14.4 kbps to 300 bps) &H5 ITU-T V.32bis only (14.4 kbps to 4800 bps) &H6 ITU-T V.22bis only (2400 bps or 1200 bps) &H7 ITU-T V.22 only (1200 bps) &H8 Bell 212 only (1200 bps) &H9 Bell 103 only (300 bps) &H10 ITU-T V.21 only (300 bps) &H11 V.
PAGE 43
Si2494/39 Table 11. Extended AT& Command Set (Command Defaults in Bold) (Continued) Command Action &Xn Automatic determination of telephone line type. &X0 Abort &x1 or &x2 command. &X1 Automatic determination of telephone line type. Result code: WXYZn W: 0 = line supports DTMF dialing. 1 = line is pulse dial only. X: 0 = line supports 20 pps dialing. 1 = line supports 10 pps dialing only. Y: 0 = extension network present (PBX). 1 = outside line (PSTN) connected directly. Z: 0 = continuous dialtone.
PAGE 44
Si2494/39 Table 12. Extended AT% Command Set (Command Defaults in Bold) Command Action %$ Display AT% command settings. %B Report blacklist. See also S42 register. %Cn Data compression %C0 Disable V.42bis and MNP5 data compression %C1 Enable V.42bis in transmit and receive paths. If MNP is selected (\N2), then %C1 enables MNP5 in transmit and receive paths. %C2 Enable V.42bis in transmit path only. %C3 Enable V.42bis in receive path only. %On Answer mode.
PAGE 45
Si2494/39 Table 12. Extended AT% Command Set (Command Defaults in Bold) (Continued) Command Action %V2 Automatic Line Status Detection—Adaptive Method. Description: Before going off-hook with the ATD, ATO, or ATA commands, the Si2494/39 compares the line voltage (via LVCS) to the NLIU (U85) register: Loop Voltage Action 0  LVCS  (0.0625 x NLIU) Report “NO LINE” and remain on-hook. (0.0625 x NLIU) < LVCS  (0.85 x NLIU) Report “LINE IN USE” and remain on-hook. (0.
PAGE 46
Si2494/39 Table 13. Extended AT\ Command Set (Command Defaults in Bold) Command \$ Action Display AT\ command settings.
PAGE 47
Si2494/39 Table 13. Extended AT\ Command Set (Command Defaults in Bold) (Continued) Command Action \Q3 Use RTS/CTS \Q4 Use XON/XOFF flow control for modem-to-DTE interface. Does not enable modem-to-modem flow control. \Tn DTE rate—Change DTE rate. When the Si2494/39 is configured in autobaud mode (default), \T0 through \T15 will lock the new baud rate and disable autobaud.
PAGE 48
Si2494/39 Table 13. Extended AT\ Command Set (Command Defaults in Bold) (Continued) Command Action \U Serial mode—causes a low pulse (25 ms) on RI and DCD. INT to be the inverse of ESC. RTS to be inverse of CTS. Parallel mode—causes a low pulse (25 ms) on INT. This command terminates with a RESET.
PAGE 49
Si2494/39 Table 14.
PAGE 50
Si2494/39 Table 14.
PAGE 51
Si2494/39 5. S-Registers The S command allows reading (Sn?) or writing (Sn = x) the S-registers. The S-registers store values for functions that typically are rarely changed, such as timers or counters, and the ASCII values of control characters, such as carriage return. Table 15 summarizes the S-register set. Table 15. S-Register Description Definition S-Register (Decimal) Function Default (Decimal) Range Units 0 Automatic answer—Number of rings the Si2494/39 must detect before answering a call.
PAGE 52
Si2494/39 Table 15. S-Register Description (Continued) Definition S-Register (Decimal) Function Default (Decimal) Range Units 24 Sleep Inactivity Time—Sets the time that the modem operates in normal power mode with no activity on the serial port, parallel port, or telephone line before entering low-power sleep mode. This feature is disabled if the timer is set to 0.
PAGE 53
Si2494/39 Table 15. S-Register Description (Continued) Definition S-Register (Decimal) Function Default (Decimal) Range 42 Blacklisting—The Si2494/39 will not dial the same number more than two times in three minutes. An attempt to dial a third time within three minutes will result in a “BLACKLISTED” result code. If the blacklist memory is full, any dial to a new number will result in a “BLACKLIST FULL” result code. Numbers are added to the blacklist only if the modem connection fails.
PAGE 54
Si2494/39 6. User-Access Registers (U-Registers) U-Registers are 16-bit registers written by the AT:Uaa command and read by the AT:R (read all U-Registers) or AT:Raa (read U-Register aa) commands (see the AT command list in Table 13 on page 46). Many aspects of the modem’s and DAA’s behavior can be enabled/disabled, configured, monitored, and/or modified through URegisters; however, most of them will not be needed in normal use. There are two types of U-Registers.
PAGE 55
Si2494/39 7.
PAGE 56
Si2494/39 Table 16. Si2494/39 Pin Descriptions (Continued) Pin # Pin Name 12 EECS EEPROM Chip Select. Active low read/write enable for SPI EEPROM. 13 EECLK EEPROM Clock. Clock for SPI EEPROM. 14 AOUTb Audio Output B. PWM audio output B when differential audio output is enabled. 15 AOUT Audio Output. PWM audio output. 16 RESET Reset Input. An active low input that is used to reset all control registers to a defined initialized state. 17 C2A Isolation Capacitor 2A.
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Si2494/39 Table 16. Si2494/39 Pin Descriptions (Continued) Pin # Pin Name Description 28 DCD, D6 Carrier Detect/Data Bit. Active low carrier detect in serial mode. Bidirectional parallel bus data bit 6 in parallel mode. 29 ESC, D5 Escape/Data Bit. Hardware escape in serial mode. Bidirectional parallel bus data bit 5 in parallel mode. 30 GPIO24, D4 General Purpose Input Output Bit/Data Bit. General purpose input output bit 24. Bidirectional parallel bus data bit 4 in parallel mode.
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Si2494/39 8. Pin Descriptions: Si3018 Si3018 QE DCT RX IB 1 2 3 4 C1B C2B VREG 5 RNG1 8 6 7 16 15 DCT2 14 DCT3 QB QE2 IGND 13 12 11 10 9 SC VREG2 RNG2 Table 17. Si3018 Pin Descriptions Pin # 1 Pin Name QE 2 DCT 3 RX 4 IB 5 C1B 6 C2B 7 VREG 8 RNG1 9 RNG2 10 VREG2 11 SC 12 QE2 13 QB 14 DCT3 15 IGND 16 DCT2 58 Description Transistor Emitter. Connects to the emitter of Q3. DC Termination. Provides dc termination to the telephone network. Receive Input.
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Si2494/39 9. Ordering Guide Chipset Max Speed System-Side Package System-Side Line-Side Temp Range Si2494 56 kbps 38 QFN Si2494-A-FM Si3018-F-FS 0 to 70 °C Si2494 56 kbps 38 QFN Si2494-A-GM Si3018-F-GS –40 to 85 °C Si2439 33.6 kbps 38 QFN Si2439-A-FM Si3018-F-FS 0 to 70 °C Si2439 33.6 kbps 38 QFN Si2439-A-GM Si3018-F-GS –40 to 85 °C Note: Add an “R” at the end of the device to denote tape and reel option. Rev. 1.
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Si2494/39 10. Package Markings (Top Markings) 10.1. Si2494 Top Marking Figure 10. Si2494-A-FM Top Marking Figure 11. Si2494-A-GM Top Marking 10.2. Si2439 Top Marking Figure 12. Si2439-A-FM Top Marking 60 Rev. 1.
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Si2494/39 Figure 13. Si2439-A-GM 10.3. Si2494/39 Top Markings Explanation Mark Method: Line 1 Marking: Line 2 Marking: Line 3 Marking: YAG Laser Part Number YY=Current Year WW=Work Week R = Die Revision T...T=Trace Code Circle=0.5 mm Diameter (Bottom-Left Justified) e3 Circle TW=Assembly Country Code Rev. 1.0 Assigned by the Assembly House. Corresponds to the last significant digit of the year and work week of the mold date. Pin 1 identifier.
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Si2494/39 10.4. Si3018 Top Marking Figure 14. Si3018-F-FS Top Marking Figure 15. Si3018-F-GS Top Marking 10.5. Si3018 Top Markings Explanation Mark Method: Line 1 Marking: Line 2 Marking: YAG Laser Part Number YY=Current Year WW=Work Week R = Die Revision T...T=Trace Code Circle=0.5 mm Diameter (Bottom-Left Justified) e3 Circle 62 Rev. 1.0 Assigned by the Assembly House. Corresponds to the last significant digit of the year and work week of the mold date. Pin 1 identifier.
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Si2494/39 11. Package Outline: 38-Pin QFN Figure 16 illustrates the package details for the Si2494/39. Table 18 lists the values for the dimensions shown in the illustration.
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Si2494/39 Table 18. Package Diagram Dimensions1,2,3 Millimeters Symbol Min Nom Max A 0.75 0.85 0.95 A1 0.00 0.01 0.05 b 0.18 0.23 0.30 D D2 5.00 BSC. 3.10 e 3.20 3.30 0.50 BSC. E 7.00 BSC. E2 5.10 5.20 5.30 L 0.35 0.45 0.55 L1 0.03 0.05 0.08 aaa — — 0.10 bbb — — 0.10 ccc — — 0.08 ddd — — 0.10 Notes: 1. All dimensions shown are in millimeters (mm) unless otherwise noted. 2. Dimensioning and Tolerancing per ANSI Y14.5M-1982. 3.
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Si2494/39 12. 38-Pin QFN Land Pattern Figure 17 shows the recommended land pattern for the Si2494/39 QFN-38 package. Table 19 lists the values for the dimensions shown in the illustration. Figure 17. QFN-38 Land Pattern Drawing Table 19. QFN-38 PCB Land Pattern Dimensions Dimension Feature Min Max C1 Pad column spacing 4.70 4.80 C2 Pad row spacing 6.70 6.80 E Pad pitch 0.50 BSC X1 Pin pad width 0.20 0.30 X2 Thermal pad width 3.20 3.30 Y1 Pin pad width 0.80 0.
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Si2494/39 13. Package Outline: 16-Pin SOIC Figure 18 illustrates the package details for the Si3018 16-pin packaging option. Table 20 lists the values for the dimensions shown in the illustration. Figure 18. 16-Pin Small Outline Integrated Circuit (SOIC) Package 66 Rev. 1.
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Si2494/39 Table 20. Package Diagram Dimensions Dimension Min Max A — 1.75 A1 0.10 0.25 A2 1.25 — b 0.31 0.51 c 0.17 0.25 D 9.90 BSC E 6.00 BSC E1 3.90 BSC e 1.27 BSC L 0.40 L2 1.27 0.25 BSC h 0.25 0.50 θ 0° 8° aaa 0.10 bbb 0.20 ccc 0.10 ddd 0.25 Notes: 1. All dimensions shown are in millimeters (mm) unless otherwise noted. 2. Dimensioning and Tolerancing per ANSI Y14.5M-1994. 3. This drawing conforms to the JEDEC Solid State Outline MS-012, Variation AC. 4.
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Si2494/39 14. 16-Pin SOIC Land Pattern Figure 19 illustrates the recommended land pattern for the Si2494/39 16-Pin SOIC. Table 21 lists the values for the dimensions shown in the illustration. Figure 19. 16-Pin SOIC Land Pattern Diagram Table 21. 16-Pin SOIC Land Pattern Dimensions Dimension Feature (mm) C1 Pad Column Spacing 5.40 E Pad Row Pitch 1.27 X1 Pad Width 0.60 Y1 Pad Length 1.55 Notes: General 1. All dimensions shown are in millimeters (mm) unless otherwise noted. 2.
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Si2494/39 NOTES: Rev. 1.
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Si2494/39 CONTACT INFORMATION Silicon Laboratories Inc. 400 West Cesar Chavez Austin, TX 78701 Tel: 1+(512) 416-8500 Fax: 1+(512) 416-9669 Toll Free: 1+(877) 444-3032 Please visit the Silicon Labs Technical Support web page: https://www.silabs.com/support/pages/contacttechnicalsupport.aspx and register to submit a technical support request. The information in this document is believed to be accurate in all respects at the time of publication but is subject to change without notice.