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Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com

Rev. 1.2 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • December 29, 2021

AN332

Si47XX PROGRAMMING GUIDE

1. Introduction

This document provides an overview of the programming requirements for the Si4704/05/06/07/1x/2x/3x/4x/84/85

FM transmitter/AM/FM/SW/LW/WB receiver. The hardware control interface and software commands are detailed

along with several examples of the required steps to configure the device for various modes of operation.

2. Overview

This family of products is programmed using commands and responses. To perform an action, the system

controller writes a command byte and associated arguments, causing the device to execute the given command.

The device will, in turn, provide a response depending on the type of command that was sent. Section "4.

Commands and Responses" on page 6 and Section "5. Commands and Properties" on page 7 describe the

procedures for using commands and responses and provide complete lists of commands, properties, and

responses.

The device has a slave control interface that allows the system controller to send commands to and receive

responses from the device using one of three serial protocols (or bus modes): 2-wire mode (I

C and SMBUS

compatible), 3-wire mode, or SPI mode.

Section "6. Control Interface" on page 223 describes the control interface in detail.

Section "7. Powerup" on page 231 describes options for the sequencing of VDD and VIO power supplies, selection

of the desired bus mode, provision of the reference clock, RCLK, and sending of the POWER_UP command.

Section "8. Powerdown" on page 238 describes sending the POWER_DOWN command and removing VDD and

VIO power supplies as necessary.

Section "9. Digital Audio Interface" on page 239 describes the digital audio format supported and how to operate

the device in digital mode.

Section "10. Timing" on page 242 describes the CTS (Clear to Send) timing indicating when the command has

been accepted and in most cases completed execution, and the STC (Seek/Tune Complete) timing indicating

when the Seek/Tune commands have completed execution.

Section "11. FM Transmitter" on page 248 describes the audio dynamic range control, limiter, pre-emphasis,

recommendations for maximizing audio volume for the FM transmitter.

Section "12. Programming Examples" on page 252 provides flowcharts and step-by-step procedures for

programming the device.

AN332

2 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com

Rev. 1.2 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • December 29, 2021

Table 1. Product Family Function

Part

Number

General Description

FM Transmitter

FM Receiver

AM Receiver

SW/LW Receiver

WB Receiver

RDS

High Performance RDS

RPS

SAME

Digital Input

Digital Output

Embedded FM antenna

AEC-Q100 Qualified

Package Size (mm)

Si4700 FM Receiver



4x4

Si4701 FM Receiver with RDS



4x4

Si4702 FM Receiver



3x3

Si4703 FM Receiver with RDS



3x3

Si4704 FM Receiver



3x3

Si4705 FM Receiver with RDS



3x3

Si4706

High Performance RDS Receiver



3x3

Si4707

WB Receiver with SAME



3x3

Si4708 FM Receiver



2.5x2.5

Si4709 FM Receiver with RDS



2.5x2.5

Si4710

FM Transmitter



3x3

Si4711 FM Transmitter with RDS



3x3

Si4712

FM Transmitter with RPS

 

3x3

Si4713 FM Transmitter with RDS & RPS

 

3x3

Si4720

FM Transceiver

 

3x3

Si4721 FM Transceiver with RDS

   

3x3

Si4730 AM/FM Receiver



3x3

Si4731 AM/FM Receiver with RDS

 



3x3

Si4732

AM/SW/LW/FM Receiver with RDS

  

SOIC16

Si4734 AM/SW/LW/FM Receiver



3x3

Si4735 AM/SW/LW/FM Receiver with RDS

 



3x3

Si4736 AM/FM/WB Receiver

 

3x3

Notes:

1. Digital Output is available in Si4704-D60 and later.

2. High Performance RDS is available in Si4705/31/35/85-D50 and later, Si4732.

3. Si4706, Si4707, and Si474x are covered under NDA.

4. There is an errata for the digital audio input for Si4710-B30, Si4712-B30, and Si4720-B20. A patch is available to

enable digital audio input for these devices. Please contact Skyworks Solutions to request a patch.

5. Si4732-A10 has the same firmware FMRX component and AM_SW_LW RX component as that of Si4735-D60, so

Si4732-A10 is considered as the most recent revision as D60, and the Si4735-D60 related descriptions in Appendix A

and Appendix B also apply to Si4732-A10 if not specified.

AN332

4 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com

Rev. 1.2 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • December 29, 2021

TABLE OF CONTENTS

Section Page

1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1

2. Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1

3. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

4. Commands and Responses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6

5. Commands and Properties . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7

5.1. Commands and Properties for the FM/RDS Transmitter (Si4710/11/12/13/20/21) . . .7

5.2. Commands and Properties for the FM/RDS Receiver

(Si4704/05/06/2x/3x/4x/84/85) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .55

5.3. Commands and Properties for the AM/SW/LW Receiver

(Si4730/31/32/34/35/36/37/40/41/42/43/44/45) . . . . . . . . . . . . . . . . . . . . . . . . . . . .123

5.4. Commands and Properties for the WB Receiver (Si4707/36/37/38/39/42/43) . . . .170

5.5. Commands and Properties for the Stereo Audio ADC Mode (Si4704/05/30/31) . .204

6. Control Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .223

6.1. 2-Wire Control Interface Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .223

6.2. 3-Wire Control Interface Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .226

6.3. SPI Control Interface Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .229

7. Powerup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .231

7.1. Powerup from Device Memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .232

7.2. Powerup from a Component Patch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .233

8. Powerdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .238

9. Digital Audio Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .239

10. Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .242

11. FM Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .248

11.1. Audio Dynamic Range Control for FM Transmitter . . . . . . . . . . . . . . . . . . . . . . . .248

11.2. Audio Pre-emphasis for FM Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .249

11.3. Audio Limiter for FM Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

250

11.4. Maximizing Audio Volume for FM Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . .250

12. Programming Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .252

12.1. Programming Example for the FM/RDS Transmitter . . . . . . . . . . . . . . . . . . . . . .252

12.2. Programming Example for the FM/RDS Receiver . . . . . . . . . . . . . . . . . . . . . . . .270

12.3. Programming Example for the AM/LW/SW Receiver . . . . . . . . . . . . . . . . . . . . . .292

12.4. Programming Example for the WB/SAME Receiver . . . . . . . . . . . . . . . . . . . . . . .302

Appendix A—Comparison of the Si4704/05/3x-B20,

Si4704/05/3x-C40, and Si4704/05/3x-D60 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .312

Appendix B—Si4704/05/3x-B20/-C40/-D60 Compatibility Checklist . . . . . . . . . . . . . . . .316

Document Change List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .319

Contact Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .321

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