Specifications

ManualsBrandsSilicon Laboratories ManualsComputer equipmentSi2415

This information applies to a product under development. Its characteristics and specifications are subject to change without notice.

U.S. Patent #5,870,046

U.S. Patent #6,061,009

Other patents pending

Ordering Information

This data sheet is valid only for

those chipset combinations listed

on page 68.

Pin Assignments

Si2457/34/15

CLKIN/XTALI

XTALO

CLKOUT/EECS/A0

FSYNC/D6

VD3.3

GND

VDA

RTS/D7

RXD/RD

TXD/WR

CTS/CS

RESET

AOUT/INT

RI/D1

SDI/EESD/D2

VDB

VD3.3

ESC/D3

DCD/D4

GND

SDO/EECLK/D5

INT/DO

C2A

C1A

DCT

C1B

C2B

VREG

RNG1

RNG2

VREG2

QE2

DCT3

IGND

DCT2

Si3018

Si2457/Si2434/Si2415

V.90, V.34, V.32BIS ISOMODEM

WITH INTEGRATED GLOBAL DAA

Features

Applications

Description

The Si2457, Si2434, and Si2415 are complete two-chip modems ranging

in speed from 56,000 bps to 14,400 bps. The ISOmodem

chipsets utilize

Silicon Laboratories’ third-generation direct access arrangement (DAA) to

provide a globally-programmable telephone line interface with an

unparalleled level of integration. By sharing the same line-side device, a

single design can be used in all countries and for all modem speeds.

Available in two small packages, these compact solutions eliminate the

need for a separate DSP, modem controller, codec, isolation transformer,

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

ISOmodem provides conventional data formats with connect rates of up

to 56,000 bps, full-duplex, over the Public Switched Telephone Network

(PSTN). These devices are ideal for embedded modem applications due

to their flexibility, small footprint, and minimal external component count.

Functional Block Diagram

 Data modem formats

 ITU-T, Bell

 300 bps up to 56 kbps

 V.21,V.22, V.29 Fast Connect

 V.42, V.42bis, MNP2-5

 Automatic rate negotiation



Type I and II caller ID decode

 No external ROM or RAM required

 UART or parallel interface

 AT command set support

 Integrated DAA

 Over 5000 V Capacitive isolation

 Parallel phone detect

 Globally-compliant line interface

 Overcurrent detection



27 MHz clock input

 3.3 V power

 Firmware upgradeable

 EEPROM interface

 Set-top boxes

 Point-of-sale terminals

 ATM terminals

 Digital video recorder

 Digital televisions

 Remote monitoring

Serial

Interface

Parallel

Interface

Microcontroller

DSP

DAA

Interface

RAM/ROM

PLL

Clocking

Si3018

CLKIN/XTALI XTALO

CLKOUT

RXD

TXD

CTS

RTS

DCD

ESC

INT

RESET

To Phone

Line

AOUT

Data Bus

D0-D7

ISOB

Summary of content (72 pages)

PAGE 1
Si2457/Si2434/Si2415 V.90, V.34, V. 32 B I S I S O M O D E M ® WITH I N T E G R A T E D G L O B A L DAA Features Data modem formats Integrated DAA ITU-T, Bell 300 bps up to 56 kbps V.21,V.22, V.29 Fast Connect V.42, V.42bis, MNP2-5 Automatic rate negotiation Over 5000 V Capacitive isolation Parallel phone detect Globally-compliant line interface Overcurrent detection Type I and II caller ID decode No external ROM or RAM required UART or parallel interface AT command set support 27 MHz clock input 3.
PAGE 2
Si2457/Si2434/Si2415 2 Rev. 0.
PAGE 3
Si2457/Si2434/Si2415 TA B L E O F C O N T E N TS Section Page Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 Typical Application Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Bill of Materials: Si2457/34/15 Chipset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Functional Description . . . . . . . . . . . . . . . . . . .
PAGE 4
Si2457/Si2434/Si2415 Electrical Specifications Table 1. Recommended Operating Conditions Parameter1 Symbol Test Condition Min2 Typ Max2 Unit TA F-Grade 0 25 70 °C 3.0 3.3 3.6 V Ambient Temperature 3 Si2457/34/15 Supply Voltage, Digital VD Notes: 1. The Si2457/34/15 specifications are guaranteed when the typical application circuit (including component tolerance) and any Si2457/34/15 and any Si3018 are used. See "Typical Application Schematic" on page 10. 2.
PAGE 5
Si2457/Si2434/Si2415 TIP + 600 Ω Si3018 IL VTR 10 µF – RING Figure 1. Test Circuit for Loop Characteristics Table 3. DC Characteristics, VD = 3.0 to 3.6 V (VD = 3.0 to 3.6 V, TA = 0 to 70 °C for K-Grade) Parameter Symbol Test Condition Min Typ Max Unit High Level Input Voltage VIH 2.0 — — V Low Level Input Voltage VIL — — 0.8 V High Level Output Voltage VOH IO = –2 mA 2.4 — — V Low Level Output Voltage VOL IO = 2 mA — — 0.
PAGE 6
Si2457/Si2434/Si2415 Table 4. AC Characteristics (VD = 3.0 to 3.6 V, TA = 0 to 70 °C for K-Grade, Fs = 8 kHz) Parameter Symbol Sample Rate Test Condition Fs Min Typ Max Unit — 8 — kHz Clock Input Frequency FXTL default — 4.9152 — MHz Clock Input Frequency FXTL >10 kΩ resistor between pin 23 and GND — 27 — MHz Receive Frequency Response Low –3 dBFS Corner, FILT = 0 — 5 — Hz Receive Frequency Response Low –3 dBFS Corner, FILT = 1 — 200 — Hz VFS — 1.
PAGE 7
Si2457/Si2434/Si2415 Table 5. Absolute Maximum Ratings Parameter Symbol Value Unit DC Supply Voltage VD 4.1 V Input Current, Si2457/34/15 Digital Input Pins IIN ±10 mA Digital Input Voltage VIND –0.3 to 5.3 V CLKIN/XTALI Input Voltage VXIND –0.3 to (VD + 0.3) V TA –10 to 100 °C TSTG –40 to 150 °C Operating Temperature Range Storage Temperature Range Note: Permanent device damage may occur if the above absolute maximum ratings are exceeded.
PAGE 8
Si2457/Si2434/Si2415 UART Time for Modem Receive Path (8N1 Mode) 8-B it Data M ode RX S tart tR TS D0 D1 D2 D3 D4 D5 D6 D7 S top t R TH RTS UART Timing for Modem Transmit Path (9N1 Mode with 9th Bit Escape) 9-B it Data M ode TX S tart D0 D1 D2 D3 D4 D5 D6 D7 ESC t R TS t CTH CTS Figure 2. Asynchronous UART Serial Interface Timing Diagram 8 S top Rev. 0.
PAGE 9
Si2457/Si2434/Si2415 t CSS t CSH t AS t AH CS ADDRESS = 0 or 1 A0 t RL t RC RD t DZ t RLDD t DH D[7:0] VALID DATA VALID DATA t RLDD Figure 3. Parallel Interface Read Timing 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 Rev. 0.
PAGE 10
RESET_ RTS_/D7 RXD/RD_ TXD/WR_ CTS_/CS_ CLKOUT/EECS_/A0 INT_/D0 RI_/D1 EESD/D2 EECLK/D5 DCD_/D4 ESC/D3 AOUT/INT_ D6 12 8 9 10 11 3 16 17 18 24 23 22 15 4 5 21 RESET RTS/D7 RXD/RD TXD/WR CTS/CS U1 C51 C53 C2A C1A XTALO CLKIN/XTALI CLKOUT/EECS/A0 INT/D0 RI/D1 EESD/D2 EECLK/D5 DCD/D4 ESC/D3 AOUT/INT D6 VD3.3 VD 3.
PAGE 11
Si2457/Si2434/Si2415 Bill of Materials: Si2457/34/15 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 0.01 µF, 16 V, X7R, ±20% Venkel, SMEC 33 pF, 16 V, X7R, ±20% Venkel, SMEC C10 1 C40, C41 C51, C53 0.
PAGE 12
Si2457/Si2434/Si2415 Table 7. Protocol Characteristics Item Specification Data Rate 56 kbps1 54.666 kbps1 53.333 kbps1 52 kbps1 50.666 kbps1 49.333 kbps1 48 kbps1 46.666 kbps1 45.333 kbps1 44 kbps1 42.666 kbps1 41.333 kbps1 40 kbps1 38.666 kbps1 37.333 kbps1 36 kbps1 34.666 kbps1 33.333 kbps1 32 kbps1 30.666 kbps1 29.333 kbps1 28 kbps1 33.6 kbps2 31.2 kbps2 28.8 kbps2 26.4 kbps2 24.0 kbps2 21.6 kbps2 19.2 kbps2 16.8 kbps2 14.4 kbps 12.
PAGE 13
Si2457/Si2434/Si2415 Table 7. Protocol Characteristics (Continued) Item Data Format Bit asynchronous Compatibility Specification Selectable 8, 9, 10, or 11 bits per character ITU-T V.901, V.342, V.32bis, V.32, V.23, V.22bis, V.22, V.21, Bell 212A, and Bell 103 Operating Mode Switched network Two-wire full duplex Data Modulation 28 to 56 kbps1 2.4 to 33.6 kbps2 14.4 kbps 12.0 kbps 9600 bps 9600 bps 9600 bps 7200 bps 4800 bps 2400 bps 1200 bps 0 to 300 bps V.90 as specified by ITU-T V.
PAGE 14
Si2457/Si2434/Si2415 Table 7. Protocol Characteristics (Continued) Item Specification Output Level Permissive—Switched network Receive Carrier ITU-T V.901 ITU-T V.342 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.
PAGE 15
Si2457/Si2434/Si2415 Table 7. Protocol Characteristics (Continued) Item Specification Call Progress Monitor BUSY CONNECT (rate) NO ANSWER NO CARRIER NO DIALTONE OK RING RINGING Notes: 1. Supported on Si2457 only. 2. Supported on Si2457 and Si2434 only. Rev. 0.
PAGE 16
Si2457/Si2434/Si2415 Functional Description Digital Interface The Si2457/34/15 ISOmodem® is a complete embedded modem chipset with integrated direct access arrangement (DAA) that provides a programmable line interface to meet global telephone line requirements. Available in two small packages, this solution includes a DSP data pump, modem controller, on-chip RAM and ROM, codec, DAA, analog output, and 27 MHz clock input.
PAGE 17
Si2457/Si2434/Si2415 Parallel Interface The parallel interface is an 8-bit data bus with a single bit address. Figure 3 on page 9 shows the required timing for the parallel interface. If A0 = 0, the data bus represents a read/write to the “Parallel Interface 0 (0x00)” register on page 63. If A0 = 1, the data bus represents a read/write to the “Parallel Interface 1 (0x01)” register on page 64). Command Mode Upon reset, the ISOmodem® is in command mode and accepts “AT” commands.
PAGE 18
Si2457/Si2434/Si2415 wire mode. Caller ID Operation The Si2457/34/15 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. Parallel Phone Detection The ISOmodem® is able to detect when another telephone, modem, or other device is using the phone line.
PAGE 19
Si2457/Si2434/Si2415 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 6. Loop Current Overcurrent Detection The Si2457/34/15 includes an overcurrent detection feature that measures the loop current at a programmable time after the Si2457/34/15 goes offhook. This allows the Si2457/34/15 to detect if it is connected to an improper telephone line.
PAGE 20
Si2457/Si2434/Si2415 AT Commands At powerup, the Si2457/34/15 is in the AT command mode. In command mode, the modem monitors the input (serial or parallel) checking constantly for a valid command (AT commands are described in Table 9.) Table 9. Basic AT Command Set (Command Defaults in Bold) Command Action $ Display AT command mode settings. A Answer incoming call A/ Re-execute last command. This is the only command not preceded by “AT” or followed by a .
PAGE 21
Si2457/Si2434/Si2415 Table 9. Basic AT Command Set (Command Defaults in Bold) (Continued) Command Action Hn Hook switch. H0 Go on-hook (hang up modem). H1 Go off-hook. In Identification and checksum. I0 Display Si2457/34/15 revision code. B: Revision B C: Revision C, etc. Display Si2457/34/15 firmware revision code (numeric). I1 I7 Display line-side revision code. 18C = Si3018 revision C Display the ISOmodem® model number. “2415” = Si2415 “2434” = Si2434 “2457” = Si2457 Diagnostic results 1.
PAGE 22
Si2457/Si2434/Si2415 Table 9. Basic AT Command Set (Command Defaults in Bold) (Continued) Command Action V1 Verbal result codes Xn Call Progress Monitor (CPM)—This command controls which CPM signals are monitored and reported to the host from the Si2457/34/15. (See Table 13 on page 35.) Basic results; disable CPM—Blind dial (does not wait for dial tone). CONNECT message does not include speed. Extended results; disable CPM—Blind dial. CONNECT message includes speed.
PAGE 23
Si2457/Si2434/Si2415 Table 9. Basic AT Command Set (Command Defaults in Bold) (Continued) Command Action +DR=X Data compression reporting. X Mode 0 Disabled 1 Enabled If enabled, the intermediate result code is transmitted at the point after error control negotiation. The format of this result code is as follows: Result code Mode +DR:NONE Data compression is not in use +DR:V42B Rec. V.42bis is in use in both directions +DR:V42B RD Rec. V.42bis is in use in receive direction only +DR:V42B TD Rec. V.
PAGE 24
Si2457/Si2434/Si2415 Table 9. Basic AT Command Set (Command Defaults in Bold) (Continued) Command Action +ESA Options +ESA = A +ESA = A,B +ESA = A,B,C +ESA = A,B,C,E +ESA = A,B,C,E,F +ESA = A,B,C,E,F,G Synchronous access mode control options A Specifies action taken if an underrun condition occurs during transparent sub-mode. 0 Modem transmits 8-bit SYN sequences on idle.
PAGE 25
Si2457/Si2434/Si2415 Table 9. Basic AT Command Set (Command Defaults in Bold) (Continued) Command +GCI = X Action Country settings - Automatically configure all registers for a particular country.
PAGE 26
Si2457/Si2434/Si2415 Table 9. 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 +MR = X +MS Options +MS = A +MS = A,B +MS = A,B,C +MS = A,B,C,D +MS = A,B,C,D,E +MS = A,B,C,D,E,F 26 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 27
Si2457/Si2434/Si2415 Table 9. Basic AT Command Set (Command Defaults in Bold) (Continued) Command +PCW = X +VCDT = X +VCID = X +VCIDR? Action Controls the action to be taken upon detection of call waiting. X Mode 0 Toggle RI and collect type II Caller ID if enabled by +VCID. 1 Hang up. 2 Ignore call waiting. Caller ID Type. X Mode 0 After ring only 1 Always on 2 UK 3 Japan Caller ID Enable.
PAGE 28
Si2457/Si2434/Si2415 Extended AT Commands The extended AT commands are supported by the Si2457/34/15 and are described in Tables 10 through 12. Table 10. Extended AT& Command Set (Command Defaults in Bold) Command Action &$ Display AT& current settings. &D0 ESC (pin 22) is not used &D1 ESC (pin 22) escapes to command mode from data mode if also enabled by HES U70, bit 15. &D2 ESC (pin 22) assertion during a modem connection causes the modem to go on-hook and return to command mode.
PAGE 29
Si2457/Si2434/Si2415 Table 10. Extended AT& Command Set (Command Defaults in Bold) (Continued) Command Action &H4 ITU-T V.32bis with automatic fallback (14.4 kbps to 300 bps) (default for Si2415) &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 30
Si2457/Si2434/Si2415 Table 10. Extended AT& Command Set (Command Defaults in Bold) (Continued) Command Action 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. 1 = make-break dialtone. n: 0–9 (number required for outside line if Y = 0).
PAGE 31
Si2457/Si2434/Si2415 Table 11. Extended AT% Command Set (Command Defaults in Bold) (Continued) Command %V1 Action Automatic Line Status Detection—Fixed Method. Description: Before going off-hook with the ATD, ATO, or ATA commands, the Si2457/34/15 compares the line voltage (via LVCS) to registers NOLN (U83) and LIUS (U84): Loop Voltage 0 ≤ LVCS ≤ NOLN NOLN ≤ LVCS ≤ LIUS LIUS ≤ LCVS Action Report “NO LINE” and remain on-hook. Report “LINE IN USE” and remain on-hook.
PAGE 32
Si2457/Si2434/Si2415 Table 12. Extended AT\ Command Set (Command Defaults in Bold) Command \$ Action Display AT\ command settings.
PAGE 33
Si2457/Si2434/Si2415 Table 12. 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 Si2457/34/15 is configured in autobaud mode (default), \T0 through \T15 will lock the new baud rate and disable autobaud.
PAGE 34
Si2457/Si2434/Si2415 Table 12. 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 35
Si2457/Si2434/Si2415 Table 13.
PAGE 36
Si2457/Si2434/Si2415 Table 13.
PAGE 37
Si2457/Si2434/Si2415 Table 13. Result Codes (Continued) Numeric 100 Meaning Link established at 53333 Verbal Response X1 X2 X3 X4 X5 3 X0 X X X X X 3 X X X X X X X X X X CONNECT 53333 101 Link established at 54666 CONNECT 54666 102 DTMF dial attempted on a pulse dial only line UN–OBTAINABLE NUMBER X Notes: 1. This message is only supported on the Si2457 and Si2434. 2. X is the only verbal response code that does not follow the Result Code standard.
PAGE 38
Si2457/Si2434/Si2415 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 14 summarizes the S-register set. Table 14.
PAGE 39
Si2457/Si2434/Si2415 Table 14. 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 40
Si2457/Si2434/Si2415 Table 14. S-Register Description (Continued) Definition S-Register (Decimal) Function Default (Decimal) Range 42 Blacklisting—The Si2457/34/15 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 41
Si2457/Si2434/Si2415 User-Access Registers (U-Registers) The :U AT command is used to write these 16-bit U-registers, and the :R command is used to read them. U-registers are identified by a hexidecimal (hex) address. Table 15. U-Register Description Register Name Description Default U00 DT1A0 0x0800 U01 DT1B1 DT1 registers set the coefficients for stage 1 of the Dial Tone Detect filter. Default is for FCC countries. See “AN93: Modem Designer’s Guide” for other country settings.
PAGE 42
Si2457/Si2434/Si2415 Table 15. U-Register Description (Continued) Register Name Description Default U17 BT1A0 0x0800 U18 BT1B1 BT1 registers set the coefficients for stage 1 of the Busy Tone Detect filter. Default is for FCC countries. See “AN93: Modem Designer’s Guide” for other country settings.
PAGE 43
Si2457/Si2434/Si2415 Table 15. U-Register Description (Continued) Register Name Description Default U33 RMOT Ringback cadence minimum on time in seconds multiplied by 7200. 0x1200 U34 DTWD Window to look for dialtone in seconds multiplied by 1000. 0x1B58 U35 DMOT Minimum dialtone on time in seconds multiplied by 7200. 0x2D00 U37 PD0 Number of pulses to dial 0. 0x000A U38 PD1 Number of pulses to dial 1. 0x0001 U39 PD2 Number of pulses to dial 2.
PAGE 44
Si2457/Si2434/Si2415 Table 15. U-Register Description (Continued) Register Name U4F FHT U50 44 Description Default Flash Hook Time. Time corresponding with “!” or “&” dial modifier that the Si2457/34/15 goes on-hook during a flash hook (ms units). 0x01F4 LCDN Loop current debounce on time (ms units). 0x015E U51 LCDF Loop current debounce off time (ms units). 0x00C8 U52 XMTL Transmit level (1 dB units)—Sets the modem data pump transmitter level. Default level of 0 corresponds to –9.85 dBm.
PAGE 45
Si2457/Si2434/Si2415 Table 15. U-Register Description (Continued) Register Name Description Default U87 SAM This is a bit-mapped register 0x0000 U9F SASF SAS frequency detection. See “AN93: Modem Designer’s Guide” for complete details. 0x0000 UA0 SC0 SAS cadence 0. Sets the duration of the first SAS tone (ms). 0x01E0 UA1 SC1 SAS cadence 1. Sets the duration of the first SAS silence (ms). 0x0000 UA2 SC2 SAS cadence 2. Sets the duration of the second SAS tone (ms).
PAGE 46
Si2457/Si2434/Si2415 Table 16. Bit-Mapped U-Register Summary Reg.
PAGE 47
Si2457/Si2434/Si2415 Bit-Mapped U-Register Detail (defaults in bold) U4D MOD1 Bit D15 D14 D13 D12 D11 D10 D9 Name TOCT NHFP NHFD CLPD CCAD Type R/W R/W R/W R/W R/W D8 D7 D6 FTP SPDM R/W R/W D5 D4 D3 GT18 GT55 CTE R/W R/W R/W D2 D1 D0 Reset settings = 0x0000 Bit Name Function 15 Reserved 14 TOCT 13 Reserved 12 NHFP No Hook Flash Pulse. 0 = Disable. 1 = Enable. 11 NHFD No Hook Flash Dial. 0 = Disable. 1 = Enable. 10 CLPD Check Loop Current Before Dialing.
PAGE 48
Si2457/Si2434/Si2415 U53 MOD2 Bit D15 Name REV Type R/W D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 Reset settings = 0x0000 Bit 15 Name REV Function 14:0 Reserved V.23 Reversing. 0 = Disable. 1 = Enable. Read returns zero. U62 DAAC1 Bit D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 Name 0 0 0 0 1 0 0 OHS2 0 0 0 0 0 FOH DL 0 Type R/W R/W R/W Reset settings = 0x0804 Bit Name 15:12 Reserved Must be set to 0.
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Si2457/Si2434/Si2415 U63 DAAC3 Bit D15 D14 D13 D12 Name D11 D10 D9 D8 D7 LCS[7:0] D6 D5 D4 D3 D2 D1 D0 D1 D0 ACT[3:0] Type R/W Reset settings = 0x0003 Bit Name Function 15:8 LCS[7:0] Off-Hook Loop Current (1.1 mA/bit). 7:4 ACT[3:0] AC Termination Select. ACT[3:0] AC Termination 0000 Real 600 Ω 0011 220 Ω + (820 Ω || 120 nF) and 220 Ω + (820 Ω || 115 nF) 0100 370 Ω + (620 Ω || 310 nF) 1111 Global complex impedance 3:0 Reserved Read returns 0x3.
PAGE 50
Si2457/Si2434/Si2415 U66 DAAC5 Bit D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 Name FDT Type R D5 Reset settings = 0x0040 Bit Name Function 15:7 Reserved 6 FDT* 5:4 Reserved Read returns zero. 3:0 Reserved Do not modify. Read returns zero. Frame Detect. 0 = Indicates ISOmodem has not established frame lock. 1 = Indicates ISOmodem frame lock has been established. *Note: Typically used only for board-level debug. 50 Rev. 0.
PAGE 51
Si2457/Si2434/Si2415 U67 ITC1 Bit D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 Name MINI[1:0] ILIM DCR OHS Type R/W R/W R/W R/W D5 D4 D3 D2 D1 D0 DCV[1:0] RZ RT R/W R/W R/W Reset settings = 0x0008 Bit Name Function 15:14 Reserved Read returns zero. 13:12 MINI[1:0] Minimum Operational Loop Current. Adjusts the minimum loop current at which the DAA can operate. Increasing the minimum operational loop current can improve signal headroom at a lower TIP/RING voltage.
PAGE 52
Si2457/Si2434/Si2415 Bit Name Function 1 RZ Ringer Impedance. 0 = Maximum (high) ringer impedance. 1 = Synthesize ringer impedance. C15, R14, Z2, and Z3 must not be installed when setting this bit. See the “Ringer Impedance” section in “AN93: Modem Designer’s Guide”. 0 RT Ringer Threshold Select. Used to satisfy country requirements on ring detection. Signals below the lower level does not generate a ring detection; signals above the upper level are guaranteed to generate a ring detection.
PAGE 53
Si2457/Si2434/Si2415 U6A ITC4 Bit D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 Name OVL Type R D1 D0 Reset settings = N/A Bit Name Function 15:3 Reserved 2 OVL 1:0 Reserved Read returns zero. Overload Detected. This bit has the same function as ROV, but clears itself after the overload has been removed. See the “Billing Tone Detection” section in “AN93: Modem Designer’s Guide”. This bit is not affected by the BTE bit. Do not modify.
PAGE 54
Si2457/Si2434/Si2415 U6E CK1 Bit D15 D14 D13 D12 D11 D10 Name R1[4:0] Type R/W D9 D8 D7 D6 D5 D4 D5 D4 D3 D2 D1 D0 D2 D1 D0 Reset settings = 0x1F20 Bit Name 15:13 Reserved 12:8 R1[4:0] 7:0 Reserved Function Do not modify. R1 CLKOUT Divider. See “AN93: Modem Designer’s Guide” for details. Read returns zero.
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Si2457/Si2434/Si2415 U70 IO0 Bit D15 Name Type D14 D13 D12 HES TES CIDM OCDM PPDM R/W R/W R/W D11 R/W D10 R/W D9 D8 D7 RIM DCDM 0 R/W R/W D6 D5 D4 D3 D2 D1 D0 CID OCD PPD RI DCD R/W R/W R/W R/W R/W Reset settings = 0x2700 Bit 15 14 13 12 11 10 9 8 7 6:5 4 3 2 1 0 Name HES Function Hardware Escape Pin. 0 = Disable. 1 = Enable. Reserved Read returns zero. TES Enable “+++” Escape. 0 = Disable. 1 = Enable. CIDM Caller ID Mask.
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Si2457/Si2434/Si2415 U71 IO1 Bit D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 Name COMP PRT Type R/W R/W Reset settings = 0x0000 Bit Name 15:5 Reserved 4 COMP 3:1 Reserved 0 PRT Function Read returns zero. 0 = Disables compression (PCM mode). 1 = Enables linear compression. Read returns zero. 0 = Disables PCM mode. 1 = Enables PCM mode.
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Si2457/Si2434/Si2415 U77 GEN2 Bit D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 Name IST[3:0] HOI AOC OHT[8:0] Type R/W R/W R/W R/W D3 D2 D1 D0 Reset settings = 0x401E Bit Name 15:12 IST[3:0] Function Intrusion Settling Time (250 ms units). Delay between when the ISOmodem goes off-hook and the off-hook intrusion algorithm begins. Default is 1 s. 11 HOI Hang-Up On Intrusion. 0 = ISOmodem will not automatically hang up when an off-hook PPD interrupt occurs.
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Si2457/Si2434/Si2415 U78 GEN3 Bit D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 Name IB[1:0] IS[8:0] Type R/W R/W D2 D1 D0 Reset settings = 0x0000 Bit Name Function 15:14 IB[1:0] Intrusion Blocking. Defines the method used to block the off-hook intrusion algorithm from operation after dialing has begun. 0 = No intrusion blocking. 1 = Intrusion disabled from start of dial to end of dial. 2 = Intrusion disabled from start of dial to IS register time-out.
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Si2457/Si2434/Si2415 U79 GEN4 Bit D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 Name LVCS[4:0] Type R D0 Reset settings = 0x0000 Bit Name Function 15:5 Reserved 4:0 LVCS[4:0] Line Voltage Current Sense. Represents either the line voltage, loop current, or on-hook line monitor. On-Hook Voltage Monitor (2.75 V/bit ±20%). 00000 = No line connected. 00001 = Minimum line voltage (VMIN = 3.0 V ± 0.5 V). 11111 = Maximum line voltage (87 V ± 20%).
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Si2457/Si2434/Si2415 U7A GENA Bit D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 Name DOP ADD Type R/W R/W D5 D4 D3 D2 D1 D0 V22HD HDLC FAST R/W R/W R/W Reset settings = 0x0000 Bit Name Function 15:8 Reserved 7 DOP Dial or Pulse. 0 = Normal ATDTW operation 1 = Use ATDTW for Pulse/Tone Dial Detection (see also ATDW command) 6 ADD Adaptive Dialing 1 = Enable 0 = Disable Attempt DTMF dial, then fall back to pulse dialing if unsuccessful. First digit is dialed as DTMF.
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Si2457/Si2434/Si2415 U7C GENC Bit D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 Name RIGPO RIGPOEN Type R R/W Reset settings = 0x0000 Bit Name 15:5 Reserved 4 RIGPO 3:1 Reserved 0 Function Reads returns to zero. RI RI (Pin 17), follows this bit when RIGPIOEN = 1b. Reads returns to zero. RIGPOEN 0 = RI indicates valid ring signal. (Normal ring-indicator mode) 1 = RI (Pin 17) can be used as a general purpose output and follows U7C[4] (RIGPO).
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Si2457/Si2434/Si2415 U87 SAM Bit D15 D14 D13 D12 D11 D10 D9 D8 D7 Name MINT SERM FSMS Type R/W R/W D6 D5 D4 D3 D2 D1 D0 XMTT R/W R/W Reset settings = 0x0000 Bit Name Function 15:11 Reserved 10 MINT Minimal Transparency 0 = Generates two-byte transparency sequences. This option will use codes through , if possible, for received data containing two back-to-back bytes requiring transparency. 1 = Generates one-byte transparency sequences.
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Si2457/Si2434/Si2415 Parallel Interface Registers Parallel Interface 0 (0x00) Bit D7 D6 D5 D4 D3 Name TX/RX[7:0] Type R/W D2 D1 D0 Reset settings = 0x00 Bit 7:0 Name Function TX/RX[7:0] Parallel Interface Transmit/Receive. This register functions similarly to the serial port TX pin on writes to the parallel port, and similarly to the serial port RX pin on reads from the parallel port. Rev. 0.
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Si2457/Si2434/Si2415 Parallel Interface 1 (0x01) Bit D7 Name RXF Type R D6 D5 D4 TXE REM INTM R R R/W D3 INT R D2 D1 ESC RTS R/W R/W D0 CTS R Reset settings = 0110_0011 Bit Name Function 7 RXF Receive FIFO Almost Full (status). 0 = Receive FIFO (12 deep) contains three or more empty locations (RXF ≤ 9). The host can clear the RXF interrupt without emptying the RX FIFO by writing a 0 to the RXF bit. This will disable the RXF interrupt until the host has emptied the FIFO.
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Si2457/Si2434/Si2415 Pin Descriptions: Si2457/34/15 Si2457/34/15 CLKIN/XTALI 1 24 SDO/EECLK/D5 XTALO 2 23 DCD/D4 CLKOUT/EECS/A0 3 22 ESC/D3 FSYNC/D6 4 21 VD3.3 VD3.3 5 GND GND 6 20 19 VDA 7 18 SDI/EESD/D2 VDB RTS/D7 8 17 RI/D1 RXD/RD 9 16 INT/DO TXD/WR 10 15 AOUT/INT CTS/CS 11 14 C1A RESET 12 13 C2A Pin # Pin Name Description 1 CLKIN/XTALI Clock Input/Crystal Oscillator Pin. This pin provides support for parallel-resonant, AT cut crystals.
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Si2457/Si2434/Si2415 Pin # Pin Name Description 10 TXD/WR Transmit Data/Write Enable. Data input from DTE TXD pin in serial mode. Active low write enable pin in parallel mode. 11 CTS/CS Clear-to-Send/Chip Select. Active low clear-to-send (for flow control) in serial mode. Active low chip select in parallel mode. 12 RESET Reset Input. An active low input that is used to reset all control registers to a defined initialized state. 13 C2A Isolation Capacitor 2A.
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Si2457/Si2434/Si2415 Pin Descriptions: Si3018 Si3018 QE DCT RX IB C1B C2B VREG RNG1 1 2 3 4 5 6 7 8 16 15 DCT2 14 13 DCT3 QB 12 11 QE2 10 9 VREG2 RNG2 IGND SC 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 Description Transistor Emitter. Connects to the emitter of Q3. DC Termination. Provides dc termination to the telephone network. Receive Input.
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Si2457/Si2434/Si2415 Ordering Guide 68 Chipset Description Digital Line Temperature Si2457 Commercial lead-free Si2457-FT Si3018-FS 0 to 70 °C Si2434 Commercial lead-free Si2434-FT Si3018-FS 0 to 70 °C Si2415 Commercial lead-free Si2415-FT Si3018-FS 0 to 70 °C Rev. 0.
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Si2457/Si2434/Si2415 Package Outline: 24-Pin TSSOP Figure 7 illustrates the package details for the Si2457/34/15. Table 18 lists the values for the dimensions shown in the illustration. ddd C B A B (2x) E H θ L bbb C B A B A D A e A1 C C γ Approximate device weight is 115.7 mg. Figure 7. 24-Pin Thin Shrink Small Outline Package (TSSOP) Table 18. Package Diagram Dimensions Millimeters Symbol Min Max A — 1.20 A1 0.05 0.15 B 0.19 0.30 C 0.09 0.20 D 7.70 7.90 E 4.30 4.
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Si2457/Si2434/Si2415 Package Outline: 16-Pin SOIC Figure 8 illustrates the package details for the Si3018. Table 19 lists the values for the dimensions shown in the illustration. 16 9 h E bbb B H -B- 1 θ 8 B L aaa C A B -A- Detail F D -C- C A A1 e See Detail F Seating Plane γ Figure 8. 16-pin Small Outline Integrated Circuit (SOIC) Package Table 19. Package Diagram Dimensions Symbol A A1 B C D E e H h L γ θ aaa bbb 70 Millimeters Min Max 1.35 1.75 .10 .25 .33 .51 .19 .25 9.80 10.00 3.
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Si2457/Si2434/Si2415 Document Change List Revision 0.9 to Revision 0.91 Updated CLKOUT frequency specification in Table 6 on page 7. Update "Bill of Materials: Si2457/34/15 Chipset" on page 11. Added Table 8 on page 16. Updated the following functional descriptions: "Serial Interface" on page 16. "Clocking/Low Power Modes" on page 17. "Parallel Phone Detection" on page 18. Added Figure 5, “Loop Voltage,” on page 18. Added Figure 6, “Loop Current,” on page 19. Updated Pin 1 and Pin 4 description on page 65.
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Si2457/Si2434/Si2415 Contact Information Silicon Laboratories Inc. 4635 Boston Lane Austin, TX 78735 Tel: 1+(512) 416-8500 Fax: 1+(512) 416-9669 Toll Free: 1+(877) 444-3032 Email: productinfo@silabs.com Internet: www.silabs.com 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.