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Skyworks Solutions Inc. SI32284-A-FMR
- Part No.:
- SI32284-A-FMR
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Telecom
- Package:
- 48-VFQFN Exposed Pad
- Datasheet:
-
SI32284-A-FMR.pdf
- Description:
- IC TELECOM INTERFACE 48QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,499
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Product details
Overview
SI32284-A-FMR from Skyworks Solutions is a dual-channel ProSLIC® integrated circuit implementing two complete foreign exchange station (FXS) telephony interfaces in a single 7 × 7 mm 48-pin QFN package. It operates from a 3.3 V supply, supports 3-wire Integrated Serial Interface (ISI), delivers –106 V maximum battery voltage, and features Smart Ringing for reduced peak current in dual-channel ringing applications-used in VoIP gateways and analog terminal adapters.
For engineers reviewing the SI32284-A-FMR datasheet, SI32284-A-FMR pinout, SI32284-A-FMR application, or SI32284-A-FMR equivalent, key selection considerations include its dual FXS channel integration, ISI digital interface compatibility, Smart Ringing capability, wideband audio support, and industrial temperature range (0 to 70 °C).
Technical Context
The SI32284-A-FMR integrates two independent SLIC channels with full BORSCHT functionality per line-including linefeed control, ringing generation, loop supervision, and hybrid/impedance programming. Each channel includes dedicated DAC/ADC, CODEC, DSP-based DTMF/tone generation, and metallic loop testing support via integrated test load and monitor ADC.
Its flexible DC-DC controller implements capacitive boost tracking to generate optimal line-state battery voltage, minimizing heat and power consumption. The device uses adaptive ringing and software-programmable parameters-including ring cadence, amplitude, waveshape, AC impedance, and loop feed current (10–45 mA)-without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channels | Dual independent FXS interfaces-enables two-line telephony in one IC, reducing board space and system cost. |
| Digital Interface | 3-wire ISI (Integrated Serial Interface)-simplifies host connection vs. PCM/SPI, requiring fewer GPIOs and no frame sync signal. |
| Max Battery Voltage | –106 V-supports long-loop operation and meets global PSTN line requirements including high-impedance and low-power conditions. |
| Operating Temp | 0 to 70 °C-validated for commercial-grade VoIP infrastructure deployments such as gateways and ATAs. |
| Package | 7 × 7 mm 48-pin QFN-surface-mount, thermally enhanced, RoHS-compliant, compatible with standard reflow profiles. |
| Smart Ringing | Patent-pending dual-channel ringing mode-reduces peak AC adapter current by interleaving ring bursts across channels. |
| Audio Bandwidth | Wideband (up to 8 kHz)-delivers voice quality exceeding PSTN standards, supporting HD voice services in VoIP endpoints. |
Pinout & Package
SI32284-A-FMR is housed in a 7 × 7 mm, 48-pin QFN package with exposed thermal pad (EP). Pin 1 is marked by a dot; pins are numbered counterclockwise. The package supports automated optical inspection and provides low-inductance ground paths for analog SLIC performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | 3.3 V Power Supply | Main digital/analog core supply-requires local 1 µF + 0.1 µF decoupling near pin. |
| VBAT_A / VBAT_B | Negative Battery Outputs | Each drives respective SLIC channel's linefeed-capable of –106 V with external FETs and transformer. |
| RING_A / TIP_A RING_B / TIP_B |
Analog Line Interfaces | Differential two-wire ports for telephone line connection-support loop/ground start, polarity reversal, and on-hook transmission. |
| ISI_CLK / ISI_DATA / ISI_SYNC | 3-Wire ISI Interface | Serial host interface-no MCLK or frame sync required; supports daisy-chain configuration up to 4 devices. |
| GPIO0–GPIO3 | Programmable I/O | Configurable as interrupts, status indicators, or control signals-supports ring detect, off-hook, or fault reporting. |
Key Features
| Feature | Design Value |
|---|---|
| Smart Ringing | Reduces peak AC adapter current by time-interleaving ring bursts across both FXS channels-enables lower-cost 5–7 W adapters in multi-line systems. |
| Capacitive Boost Tracking | Eliminates inductor-based DC-DC supplies-lowers BOM cost, footprint, and EMI vs. traditional inductive tracking solutions. |
| On-chip Test Load & MLT | Enables full metallic loop testing without external hardware-accelerates production line diagnostics and field troubleshooting. |
| Wideband Audio Support | Supports 8 kHz sampling and A-law/µ-law companding-meets ITU-T G.711/G.722 requirements for HD voice interoperability. |
| Software-Programmable SLIC | All linefeed parameters-including DC current (10–45 mA), ring trip threshold, transhybrid balance, and AC impedance-are configurable via ISI register writes. |
Applications
| VoIP Gateways | Analog Terminal Adapters (ATA) |
|---|---|
Use Scenario: Residential or SMB VoIP gateway aggregating two POTS lines into SIP trunk. IC Role / Device Role / Timing Role: Dual FXS line interface handling BORSCHT functions, ringing, DTMF, and wideband codec for each line. Use Value: Single-chip dual-line integration reduces component count and PCB area; Smart Ringing lowers adapter cost and thermal stress. |
Use Scenario: Service provider-deployed ATA converting legacy analog phones to VoIP networks. IC Role / Device Role / Timing Role: Full-featured FXS interface providing loop supervision, caller ID, pulse metering, and on-hook transmission. Use Value: Wideband audio and programmable AC impedance ensure compatibility with diverse global phone types and line conditions. |
| xDSL IADs | Wireless Fixed Terminals (WFT) |
Use Scenario: Integrated Access Device combining DSL modem and dual-line telephony in compact housing. IC Role / Device Role / Timing Role: Dual SLIC channel managing line state, ringing, and diagnostics while sharing host processor resources via ISI. Use Value: Ultra-low power consumption and capacitive boost tracking minimize heat in fanless, sealed enclosures. |
Use Scenario: Cellular-to-POTS bridge enabling landline service over LTE/5G backhaul in rural areas. IC Role / Device Role / Timing Role: FXS interface delivering reliable loop closure detection, polarity reversal, and adaptive ringing under variable power conditions. Use Value: Industrial temp range (0 to 70 °C) and robust line diagnostics support unattended outdoor deployment with minimal maintenance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-FXS telephony interface applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SI32285-A-FM | Includes DTMF detection (SI32284-A-FMR does not); otherwise identical pinout, package, and Smart Ringing capability. | Required where embedded DTMF tone decoding is needed-e.g., interactive voice response (IVR) or call progress analysis. | Select SI32285-A-FM only if DTMF detection is mandatory; SI32284-A-FMR offers lower cost and same footprint when detection is handled externally. |
| SI32280-A-FM | Lacks Smart Ringing and wideband audio; supports only narrowband (300–3400 Hz) voice and basic ringing. | Suitable for cost-sensitive, legacy PSTN-only deployments without HD voice or peak-current reduction needs. | Choose SI32280-A-FM for basic two-line service; SI32284-A-FMR adds Smart Ringing, wideband, and modern diagnostics at modest BOM premium. |
Compared with SI32285-A-FM and SI32280-A-FM, the SI32284-A-FMR uniquely balances advanced ringing efficiency and wideband voice without DTMF detection overhead-making it optimal for mid-tier VoIP gateways prioritizing power savings and voice fidelity over embedded tone analysis.
Availability
SI32284-A-FMR is available at Aetrix Electronics and suitable for VoIP gateways, analog terminal adapters, and xDSL IADs requiring stable component supply, industrial-temperature operation, and dual-FXS integration with Smart Ringing capability.
Supply support for SI32284-A-FMR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Skyworks Solutions is a global semiconductor company specializing in analog and mixed-signal connectivity solutions for communications, automotive, and industrial markets.
The SI32284-A-FMR belongs to the ProSLIC® family-designed specifically for cost-optimized, low-power, dual-channel FXS telephony in broadband access equipment and VoIP endpoints.
FAQ
Does SI32284-A-FMR support DTMF detection?
No, SI32284-A-FMR does not include on-chip DTMF detection. It supports DTMF generation only. For embedded DTMF detection, consider SI32285-A-FM or SI32281-A-FM. The SI32284-A-FMR datasheet explicitly lists DTMF detection as unsupported-this function must be implemented externally or via host processor software when using SI32284-A-FMR.
What digital interface modes does SI32284-A-FMR support?
SI32284-A-FMR supports only the 3-wire Integrated Serial Interface (ISI), not PCM or SPI. The ISI interface uses ISI_CLK, ISI_DATA, and ISI_SYNC signals and enables daisy-chaining up to four devices. This differs from other Si3228x variants like SI32282-A-FM that support PCM with daisy-chain mode.
Is SI32284-A-FMR pin-compatible with other Si3228x devices in QFN48 packages?
Yes, SI32284-A-FMR shares the same 48-pin QFN package and pinout as SI32280-A-FM, SI32281-A-FM, and SI32285-A-FM. All QFN48 variants in the Si3228x family maintain identical mechanical and electrical pin mapping-allowing drop-in replacement for functional subsets, provided host firmware and external circuitry align with feature set differences.
What is the maximum negative battery voltage supported by SI32284-A-FMR?
SI32284-A-FMR supports a maximum negative battery voltage of –106 V on both VBAT_A and VBAT_B outputs. This rating is verified per Skyworks' Si3228x Data Short and ensures compliance with international telephony line requirements, including long-loop and high-impedance conditions encountered in residential and rural deployments.
Does SI32284-A-FMR require external DC-DC components for battery generation?
SI32284-A-FMR integrates DC-DC controller logic but requires external MOSFETs, transformers, and capacitors to implement the capacitive boost tracking supply. No inductors are needed-this architecture reduces cost, size, and EMI compared to inductor-based solutions. The SI32284-A-FMR reference design specifies exact external part values for –106 V generation.
SI32284-A-FMR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- ProSLIC®
- Package/Case:
- 48-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- -
- Interface:
- 3-Wire, PCM
- Number of Circuits:
- 2
- Voltage - Supply:
- 3.3V
- Current - Supply:
- -
- Power (Watts):
- -
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-QFN (7x7)
SI32284-A-FMR FAQ
1.How can I place an order for SI32284-A-FMR through Aetrix?
Please submit a Request for Quotation (RFQ) for SI32284-A-FMR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for SI32284-A-FMR reliable?
The price and inventory of SI32284-A-FMR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI32284-A-FMR is usually 5 days.
3.What payment methods are accepted for SI32284-A-FMR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI32284-A-FMR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI32284-A-FMR?
SI32284-A-FMR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI32284-A-FMR order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for SI32284-A-FMR?
For technical support, including SI32284-A-FMR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI32284-A-FMR requirements.
6.How does Aetrix verify that SI32284-A-FMR is sourced from the original manufacturer or authorized distributors?
All SI32284-A-FMR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SI32284-A-FMR meets industry standards.
7.What is the process for return or replacement of SI32284-A-FMR?
All SI32284-A-FMR units undergo pre-shipment inspection (PSI). If there is an issue with SI32284-A-FMR, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The SI32284-A-FMR part is unused and in its original packaging.
Return procedure for SI32284-A-FMR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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