Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com

Rev. 1.0 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • August 31, 2021

P ROSLIC ® S INGLE-C HIP FXS S OLUTION WITH I NTEGRATED

S ERIAL I NTERFACE (ISI)

Si32172/3/5 Features

Applications

Description

The Si32172/3/5 devices are pin-compatible single-channel ProSLIC

products that implement a complete foreign exchange station (FXS)

telephony interface solution in accordance with all relevant LSSGR, ITU,

and ETSI specifications. The Si32172/3/5 ProSLIC ICs operate from a 3.3 V

supply and use Skyworks Solutions’ proprietary three-wire digital Integrated

Serial Interface (ISI) with 3.3 V or 1.8 V I/O to connect to SoCs with the ISI

pre-integrated. The Si32172/3/5 integrated dc-dc controller automatically

generates the optimal battery voltages required for each linestate.

Si32172/3/5 ICs are available with voltage ratings of –110 V or –140 V to

support a wide range of ringing voltages. See the Ordering Guide for the

voltage rating of each Si32172/3/5 version. The Si32172/3/5 devices are

available in a 5x7 mm 42-pin QFN package.

 Complete FXS solution in 5 x 7 mm

 3-wire ISI combines PCM, SPI, and

interrupt data

 Performs all BORSCHT functions

 Ideal for short to medium loops

 Global programmability

 Internal balanced or unbalanced

ringing

 Patented low power ringing

 Simplified configuration and

diagnostics

 Supported by ProSLIC API

 Ultra low power consumption

 Integrated tracking dc-dc controller

with direct connection to MOSFET

 Wideband voice support

(Si32172/3)

 On-hook transmission

 Loop or ground start operation

 Smooth polarity reversal

 A-Law/µ-Law companding,

linear PCM

 Software-programmable

parameters:



Ringing frequency, amplitude,

cadence, and waveshape



Two-wire ac impedance



Transhybrid balance



DC current loop feed (10-45 mA)



Loop closure and ring trip

thresholds



Ground key detect threshold

 DTMF generation

 DTMF detection (Si32175)

 Pulse metering

 3.3 V operation

 Support for 1.8 V I/O

 Maximum battery up to –140 V

 Pb-free/RoHS-compliant

packaging

 Customer Premise Equipment

(CPE)

 VoIP DSL Gateways and Routers

 Wireless Local Loop (WLL)

 Integrated Access Devices (IAD)

 Analog Terminal Adapters (ATA)

 Small Office/Home Office PBX

Patents pending

Ordering Information

See page 37.

Pin Assignments

Si32172/3/5

2

3

4

5

6

7

8

9

10

11

12

13

14

15 16 17 18 19 20 21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40

41

VDDIO

NC

NC

NC

NC

PSCLK

MISO

MOSI

DCFF

SVBAT

CAPLB

CAPP

CAPM

IREF

QGND

VDD

STIPDC

STIPAC

SRINGAC

SRINGDC

GPIO2/SRINGC

GPIO1/STIPC

NC

EPAD2

EPAD1

1

42

NC

NC

NC

NC

NC

Si32172/3/5