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SI47XX PROGRAMMING GUIDE
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Silicon Lab SI47XX PROGRAMMING GUIDE, AN332。 Si47xx系列FM芯片编程指引。
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Rev. 0.5 5/10 Copyright © 2010 by Silicon Laboratories AN332
AN332
SI47XX PROGRAMMING GUIDE
1. Introduction
1.1. Scope
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. "4. Commands and
Responses" on page 6 and "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
2
C and SMBUS
compatible), 3-wire mode, or SPI mode.
Section "6. Control Interface" on page 214 describes the control interface in detail.
Section "7. Powerup" on page 222 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 230 describes sending the POWER_DOWN command and removing VDD and
VIO power supplies as necessary.
Section "9. Digital Audio Interface" on page 231 describes the digital audio format supported and how to operate
the device in digital mode.
Section "10. Timing" on page 234 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 240 describes the audio dynamic range control, limiter, pre-emphasis,
recommendations for maximizing audio volume for the FM transmitter.
Section "12. Programming Examples" on page 244 provides flowcharts and step-by-step procedures for
programming the device.
AN332
2 Rev. 0.5
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
2
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
2
3x3
Si4734 AM/SW/LW/FM Receiver
3x3
Si4735 AM/SW/LW/FM Receiver with RDS
2
3x3
Si4736 AM/FM/WB Receiver
3x3
Si4737 AM/FM/WB Receiver with RDS
3x3
Si4738 FM/WB Receiver
3x3
Si4739 FM/WB Receiver with RDS
3x3
Si4740 AM/FM Receiver
4x4
Si4741 AM/FM Receiver with RDS
4x4
Si4742 AM/LW/SW/FM/WB Receiver
4x4
Si4743
AM/LW/SW/FM/WB Receiver with
RDS
4x4
Si4744 AM/LW/SW/FM Receiver
4x4
Si4745 AM/LW/SW/FM Receiver with RDS
4x4
Si4749 High-Performance RDS Receiver
4x4
Notes:
1. Si4706, Si4707, and Si474x are covered under NDA.
2. High Performance RDS is available in Si4705/31/35/85-D50 only.
AN332
Rev. 0.5 3
Si4784 FM Receiver
3x3
Si4785 FM Receiver with RDS
*
3x3
Table 1. Product Family Function
Notes:
1. Si4706, Si4707, and Si474x are covered under NDA.
2. High Performance RDS is available in Si4705/31/35/85-D50 only.
AN332
4 Rev. 0.5
TABLE OF CONTENTS
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
1.1. Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .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)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .54
5.3. Commands and Properties for the AM/SW/LW Receiver
(Si4730/31/34/35/36/37/40/41/42/43/44/45) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .118
5.4. Commands and Properties for the WB Receiver (Si4707/36/37/38/39/42/43) . . . .162
5.5. Commands and Properties for the Stereo Audio ADC Mode (Si4704/05/30/31/34/35)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .196
6. Control Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .214
6.1. 2-Wire Control Interface Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .214
6.2. 3-Wire Control Interface Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .217
6.3. SPI Control Interface Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .220
7. Powerup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .222
7.1. Powerup from Device Memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .223
7.2. Powerup from a Component Patch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .225
8. Powerdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .230
9. Digital Audio Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .231
10. Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . .234
11. FM Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .240
11.1. Audio Dynamic Range Control for FM Transmitter . . . . . . . . . . . . . . . . . . . . . . . .240
11.2. Audio Pre-emphasis for FM Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .241
11.3. Audio Limiter for FM Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .242
11.4. Maximizing Audio Volume for FM Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . 242
12. Programming Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .244
12.1. Programming Example for the FM/RDS Transmitter . . . . . . . . . . . . . . . . . . . . . .244
12.2. Programming Example for the FM/RDS Receiver . . . . . . . . . . . . . . . . . . . . . . . .262
12.3. Programming Example for the AM/LW/SW Receiver . . . . . . . . . . . . . . . . . . . . . .285
12.4. Programming Example for the WB/SAME Receiver . . . . . . . . . . . . . . . . . . . . . . .296
Document Change List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .305
Contact Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .306
AN332
Rev. 0.5 5
3. Terminology
SEN—Serial enable pin, active low; used as device select in 3-wire and SPI operation and address selection in
2-wire operation.
SDIO—Serial data in/data out pin.
SCLK—Serial clock pin.
RST or RSTb—Reset pin, active low
RCLK—External reference clock
GPO—General purpose output
CTS—Clear to send
STC—Seek/Tune Complete
NVM—Non-volatile internal device memory
Device—Refers to the FM Transmitter/AM/FM/SW/LW/WB Receiver
System Controller—Refers to the system microcontroller
CMD—Command byte
COMMANDn—Command register (16-bit) in 3-Wire mode (n = 1 to 4)
ARGn—Argument byte (n = 1 to 7)
STATUS—Status byte
RESPn—Response byte (n = 1 to 15)
RESPONSEn—Response register (16-bit) in 3-Wire mode (n = 1 to 8)
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