AN93 Si2493/57/34/15/04 (Revisions D and D1) and Si2494/39 (Revisions A and A1) Modem Designers Guide 1. Introduction The Si2494/93/57/39/34/15/04 ISOmodem chipset family consists of a 38-pin QFN (Si2494/39) or 24-pin TSSOP (Si2493/57/34/15/04) or 16-pin SOIC (Si2493/57/34/15/04) low-voltage modem device, and a 16-pin SOIC line- side DAA device (Si3018/10) connecting directly with the telephone local loop (Tip and Ring). This modem solution is a complete hardware (controller-based) modem that connects to a host processor through a UART, parallel or SPI interface. Parallel and EEPROM interfaces are available only on the 38-pin QFN or 24-pin TSSOP package option. Refer to Table 4, ISOmodem Capabilities, on page 10 for available part number, capability and package combinations. Isolation is provided by Skyworks Solutions isolation capacitor technology, which uses high-voltage capacitors instead of a transformer. This isolation technology complies with global telecommunications standards including FCC, ETSI ES 203 021, JATE, and all known country-specific requirements. Additional features include programmable ac/dc termination and ring impedance, on-hook and off-hook intrusion detection, Caller ID, loop voltage/loop current monitoring, overcurrent detection, ring detection, and the hook- switch function. All required program and data memory is included in the modem device. When the modem receives a software or hardware reset, all register settings revert to the default values stored in the on-chip program memory. The host processor interacts with the modem controller through AT commands used to change register settings and control modem operation. Country, EMI/EMC, and safety test reports are available from Skyworks Solutions representatives and distributors. This application note is intended to supplement the Si2494/39 Revision A/A1, Si2493 Revision D/D1, and the Si2457/34/15/04 Revision D/D1 data sheets. It provides all the hardware and software information necessary to implement a variety of modem applications, including reference schematics, sample PCB layouts, AT command and register reference, country configuration tables, programming examples and more. Particular topics of interest can be easily located through the table of contents or the comprehensive index located at the back of this document. XTI XTO PLL CLKOUT Clocking EESD EEPROM Data Bus EECLK Interface EECS C1 RXD TXD CTS UART To Phone RTS DAA Interface Line C2 DCD Interface ESC AOUT RI AOUTb CS WR Parallel RD ROM Interface A0 D0-D7 RAM SDI Program Bus SDO SPI Interface SCLK FSYNC SS SDO Si3000 SDI Interface INT MCLK RESET Figure 1. Functional Block Diagram Skyworks Solutions, Inc. Phone 781 376-3000 Fax 781 376-3100 sales skyworksinc.com www.skyworksinc.com Rev. 1.41 Skyworks Proprietary Information Products and Product Information are Subject to Change Without Notice September 10, 2021 Controller DSP Si3018/10AN93 2 Skyworks Solutions, Inc. Phone 781 376-3000 Fax 781 376-3100 sales skyworksinc.com www.skyworksinc.com Rev. 1.41 Skyworks Proprietary Information Products and Product Information are Subject to Change Without Notice September 10, 2021