SI32295-A-GM

Telecom Overview

The Si32295-A-GM is a dual Foreign Exchange Station (FXS) interface IC from Skyworks Solutions, operating within the Si3229x ProSLIC family. It integrates two complete telephony channels in an 8 x 8 mm 68-pin QFN package. The device supports wideband audio and includes DTMF detection capabilities alongside Smart Ringing functionality to reduce peak current. It operates on a 3.3 V supply with a maximum battery voltage rating of -140 V and functions within an industrial temperature range of -40 °C to +85 °C. Digital connectivity is provided via a 3-wire ISI interface.

Telecom Feature Summary

• Performs all BORSCHT functions including battery feed, over-voltage protection, ringing supervision, codec processing, hybrid generation, and test capabilities.
• Integrates two programmable DC-DC converter controllers that operate in battery tracking mode to optimize efficiency and minimize heat generation.
• Supports wideband audio compliant with PKT-SP-HDV-104-120823 and configurable for ITU-T G.722 bandwidth.
• Features Smart Ringing technology that reduces peak current requirements through 2-channel ringing operation.

Telecom Applications

• VoIP gateways and routers
• xDSL Integrated Access Devices (IADs)
• Analog Terminal Adapters (ATA)
• Wireless Local Loop (WLL) systems

Telecom Procurement Notes

Verify the specific suffix 'G' indicates the industrial temperature grade (-40 °C to +85 °C) as defined in the ordering guide. Confirm the presence of the ISI digital interface and Smart Ringing features which distinguish this part from other variants in the Si3229x series. Ensure compatibility with the host system's 3-wire serial interface timing requirements.

Telecom Selection Notes

Select this component when dual FXS channels are required in a compact footprint with industrial temperature specifications. The inclusion of DTMF detection and Smart Ringing makes it suitable for applications needing reduced AC-DC adapter costs. Verify that the host processor supports the 3-wire ISI protocol rather than PCM/SPI interfaces found in other family members.

Telecom Part Context

This device belongs to the Si3229x series of single-chip dual FXS solutions. It shares the same physical package and core architecture with models like the Si32290 and Si32291 but is uniquely configured with the ISI interface and Smart Ringing feature set. The 'A' designation refers to the revision level, while 'GM' specifies the QFN package and industrial temperature grade.

Telecom Replacement Considerations

Direct replacements within the same series include the Si32295-A-FM, which offers identical electrical and functional characteristics but is rated for commercial temperatures (0 °C to 70 °C). Other family members like the Si32291-A-GM lack the Smart Ringing feature, while Si32290-A-GM lacks DTMF detection.

Telecom FAQ

What digital interface does the Si32295-A-GM use?

The Si32295-A-GM utilizes a 3-wire Integrated Serial Interface (ISI) for communication with the host processor.

Does this device support DTMF detection?

Yes, the Si32295-A-GM includes built-in DTMF detection capabilities, distinguishing it from non-DTMF variants in the series.

What is the maximum battery voltage rating?

The device supports a maximum battery voltage (VBAT) rating of -140 V.