Silicon Laboratories SI4734/35-B20 GPO Outputs, Firmware Upgrades, Programming with Commands

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Si4734/35-B20

will be ignored by the device if the transaction is aborted.

For details on timing specifications and diagrams, refer to Figure 6 and Figure 7 on page 10.

4.17. GPO Outputs

The Si4734/35 provides five general-purpose output pins. The GPO pins can be configured to output a constant low, constant high, or high-impedance. The GPO pins can be reconfigured as specialized functions. GPO2/INT can be configured to provide interrupts and GPO3 can be configured to provide external crystal support or as DCLK in digital audio output mode. In digital output mode (Si4735 only), GPO6 and GPO7 can be configured as DFS and DOUT respectively.

4.18. Firmware Upgrades

The Si4734/35 contains on-chip program RAM to accommodate minor changes to the firmware. This allows Silicon Labs to provide future firmware updates to optimize the characteristics of new radio designs and those already deployed in the field.

4.19. Reset, Power Up, and Power Down

Setting the RST pin low will disable analog and digital circuitry, reset the registers to their default settings, and disable the bus. Setting the RST pin high will bring the device out of reset.

A power down mode is available to reduce power consumption when the part is idle. Putting the device in power down mode will disable analog and digital circuitry while keeping the bus active.

4.20. Programming with Commands

To ease development time and offer maximum customization, the Si4734/35 provides a simple yet powerful software interface to program the receiver. The device is programmed using commands, arguments, properties and responses.

To perform an action, the user writes a command byte and associated arguments, causing the chip to execute the given command. Commands control an action such as power up the device, shut down the device, or tune to a station. Arguments are specific to a given command and are used to modify the command. A complete list of commands is available in Table 14, “Si473x Command Summary,” on page 27.

Properties are a special command argument used to modify the default chip operation and are generally configured immediately after power up. Examples of properties are de-emphasis level, RSSI seek threshold, and soft mute attenuation threshold. A complete list of properties is available in Table 15, “Si473x Property Summary,” on page 28.

Responses provide the user information and are echoed after a command and associated arguments are issued. All commands provide a one-byte status update indicating interrupt and clear-to-send status information. For a detailed description of the commands and properties for the Si4734/35, see “AN332: Universal Programming Guide.”

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Contents Applications FeaturesFunctional Block Diagram DescriptionSi4734/35-B20 Table of Contents Parameter Symbol Value Unit Electrical SpecificationsParameter Symbol Test Condition Min Typ Max Unit Recommended Operating ConditionsAM/SW/LW Mode DC CharacteristicsParameter Symbol Test Condition Min Typ Max Unit FM Mode Supplies and InterfaceGPO1, GPO2/INT Parameter Symbol Min Typ Max UnitRST Wire Control Interface Characteristics1,2,3 StartSclk Sdio SEN SclkSPI Control Interface Write Timing Parameters Dclk DFS Dout Fmdeemphasis = FM Receiver Characteristics1,2RDS Bler 5% Si4734/35-B20 KHz Long Wave LW 153 279 Crystal Oscillator RefclkprescaleRefclk Typical Application Schematic Si4734/35-GMOptional Components Bill of MaterialsComponents Value/Description Supplier 5.5 Functional DescriptionOverview 3.6VAM Receiver Operating ModesFM Receiver SW ReceiverAudio Sample Rates Digital Audio Interface Si4735 OnlyAudio Data Formats I2S Digital Audio Format Soft Mute Stereo Audio Processing De-emphasisStereo DAC RDS/RBDS Processor Si4735 OnlySeek TuningBus Mode Select on Rising Edge Reference ClockSPI Control Interface Mode Programming with Commands Firmware UpgradesReset, Power Up, and Power Down GPO OutputsCmd Commands and PropertiesSi473x Command Summary DescriptionProp Name Description Default Si473x Property SummaryAmdeemphasis RdsconfigRxvolume AmchannelfilterPin Descriptions Si4734/35-GM Pin Numbers Name DescriptionQFN Ordering GuidePart Number Description Package Operating RDS/RBDSTop Mark Explanation Package Markings Top MarksSi4734/35 Top Mark Symbol Millimeters Min Nom Max Package Outline Si4734/35 QFNPCB Land Pattern Si4734/35 QFN PCB Land PatternBSC PCB Land Pattern DimensionsSymbol Millimeters Min Max Additional Reference Resources Document Change List Revision 0.4 to RevisionContact Information

SI4734/35-B20 specifications

Silicon Laboratories SI4734/35-B20 is an advanced, highly integrated broadcast radio receiver designed for various consumer applications. Hailed for its compactness and versatility, the SI4734/35-B20 offers extensive features that enable radio reception across multiple frequency bands, including AM, FM, and shortwave. It caters to the needs of manufacturers looking to incorporate reliable radio capabilities into their devices, ensuring quality sound and performance without the cumbersome designs typically associated with traditional radio receivers.

At the heart of the SI4734/35-B20 are performance-optimized technologies. One standout feature is the device's ability to support digital and analog processing simultaneously, utilizing Silicon Labs’ proprietary digital signal processing (DSP) technology. This architecture not only enhances signal clarity but also helps in mitigating noise, enabling users to experience a superior audio quality across varied environments.

Another notable characteristic of the SI4734/35-B20 is its low power consumption, making it ideal for battery-operated devices. The receiver employs sophisticated power management techniques that allow it to operate efficiently, prolonging battery life while maintaining optimal performance. In this context, the “sleep” mode and fast wake-up times contribute to significant energy savings, affirming its suitability for portable applications.

The SI4734/35-B20 is designed with a robust set of features for ease of integration into various systems. The device supports multiple programmable interfaces, including I2C, providing flexibility in communication with microcontrollers and facilitating straightforward integration into existing designs. Because of its programmable architecture, developers can customize the receiver’s capabilities according to the specific needs of their applications.

Additional features include automatic frequency control (AFC) for stability in tuning, allowing seamless transitions while listening to programs. The built-in AGC (automatic gain control) optimizes the receiver's sensitivity to ensure clear reception even in weak signal conditions.

The SI4734/35-B20 also possesses a wide frequency range, accommodating both standard and niche applications. Its compact form factor and surface-mount technology (SMT) footprint further enhance its appeal to developers seeking to maximize board space in their designs.

In conclusion, the Silicon Laboratories SI4734/35-B20 is a significant advancement in radio receiver technology, combining advanced DSP, low power consumption, and ease of integration. These attributes make it a preferred choice for engineers and manufacturers looking to deliver high-quality audio experiences across a range of consumer electronics, from radios to multifunctional smart devices.
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