SI32170-B-FM1

Telecom Overview

The SI32170-B-FM1 is a single-channel ProSLIC integrated circuit designed for foreign exchange station (FXS) telephony applications. It operates from a 3.3 V supply and interfaces via standard PCM or SPI digital protocols. The device performs all BORSCHT functions, including line feed control, diagnostics, and ringing generation. It features an integrated DC-DC controller that automatically generates optimal battery voltages for various line states. The component supports wideband voice transmission and DTMF detection. It is housed in a 5x7 mm 42-pin QFN package and complies with RoHS standards.

Telecom Feature Summary

• Performs complete BORSCHT functions for FXS telephony interfaces
• Integrated DC-DC controller for automatic battery voltage generation
• Supports wideband voice transmission and DTMF detection
• Compatible with standard PCM and SPI digital interfaces

Telecom Applications

• Customer Premise Equipment (CPE)
• VoIP DSL Gateways and Routers
• Wireless Local Loop (WLL)
• Integrated Access Devices (IAD)

Telecom Procurement Notes

Verify the specific part number against official Skyworks documentation to confirm availability and exact specifications. Check datasheets for environmental ratings and packaging details. Ensure compliance with relevant telecommunications standards such as LSSGR, ITU, and ETSI before integration into final designs.

Telecom Selection Notes

Select this component for single-channel FXS applications requiring global programmability and simplified configuration. Consider the operating temperature range and maximum battery voltage requirements when choosing between variants. Verify interface compatibility with the host DSP or microcontroller using PCM or SPI protocols.

Telecom Part Context

The SI32170-B-FM1 belongs to the Si3217x family of ProSLIC products manufactured by Silicon Laboratories. This family offers pin-compatible single-channel solutions for FXS implementations. The series includes variants supporting different voltage ratings and temperature grades, often paired with Si3291x FXO devices for isolated connections.

Telecom Replacement Considerations

Direct substitutes within the Si3217x family include the SI32176-B-FM1, SI32177-B-FM1, SI32178-B-FM1, and SI32171-B-FM1. These parts share pin compatibility but differ in features like DTMF detection, pulse metering, and maximum battery voltage ratings.