The Si3228x Dual ProSLIC® devices, in a single package, implement two complete for-
eign exchange station (FXS) telephony interfaces. The Si3228x devices operate from a
3.3 V supply and have standard PCM/SPI or 3-wire ISI digital interfaces. A pair of built-in
dc-dc converter controllers can be used to automatically generate the optimal battery
voltage required for each line-state, optimizing efficiency and minimizing heat genera-
tion. The Si3228x devices are designed to operate with capacitive boost tracking battery
supply for lower power, cost, and footprint vs. other tracking or shared battery supplies
in the industry. Self-testing and metallic loop testing (MLT) is facilitated by the built-in
DSP, monitor ADC, and test load. The devices are available with wideband audio for
better than PSTN voice quality, DTMF detection, and Smart Ringing. Smart Ringing re-
duces the peak current with 2-channel ringing for lower-cost ac-dc adapters. The
Si3228x devices are available in a 7 x 7 mm 48-pin QFN or 8 x 8 mm 56-pin QFN pack-
age.
KEY FEATURES
• Two complete FXS channels in a single 7x7
or 8x8 mm package
• Performs all BORSCHT functions
• Ideal for short- or medium-loop applications
• Ultra-low power consumption
• Patented low-power ringing
• Patent-pending Smart Ringing
• Reduces peak current with 2-channel
ringing
• Adaptive ringing
• Simplified configuration and diagnostics
• Supported by ProSLIC API
• Audio diagnostics with loopback
• Integrated test load
• Wideband voice support
• On-hook transmission
• Loop or ground start operation
• Smooth polarity reversal
• Programmable interrupts
• 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
Applications:
• VoIP gateways and routers
• xDSL IADs
• Optical Network Terminals/Units (ONT/U)
• Analog Terminal Adapters (ATA)
• Cable eMTA
• Wireless Fixed Terminals (WFT)
• Wireless Local Loop (WLL)
• WiMAX CPE
• Private Branch Exchange (PBX)
• VoIP MDU gateways
Programmable
Programmable
AC Impedance
AC Impedance
and Hybrid
and Hybrid
ADC
ADC
DAC
DAC
CODEC
ADC
ADC
DAC
DAC
Linefeed
DTMF and
DTMF &
Tone
Gen
Tone
Gen
3-wire ISI
or
PCM/SPI
Interface
Caller ID
Ringing
Ringing
Generator
Generator
CODEC
SLIC
Linefeed
Control
Linefeed
Monitor
• Ground key detect threshold
TIP
Channel A
RING
• Flexible integrated tracking DC-DC
controller supporting patent-pending low-
cost capacitive boost configuration
• DTMF Generation
• DTMF Detection (Si32281/3/5/7)
Host Interface
Line Diagnostics
Line Diagnostics
PLL
DC-DC Controller
Linefeed
DSP
SLIC
Linefeed
Control
Linefeed
Monitor
TIP
Channel B
RING
• 3-wire Integrated Serial Interface (ISI) or
PCM interface
• A-Law/µ-Law companding, linear PCM
• Pulse metering
• 3.3 V operation
• Pb-free/RoHS-compliant packaging
PCLK / PSCLK
Si3228x
Functional Block Diagram
silabs.com
| Smart. Connected. Energy-friendly.
This information applies to a product under development. Its characteristics and specifications are subject to change without notice.
Preliminary Rev. 0.5
Si3228x Data Short: ProSLIC
®
Single-Chip Dual FXS Solution
Table 1.1. Si3228x Ordering Guide
P/N
Si32280-A-FM
Si32280-A-GM
Si32281-A-FM
Si32281-A-GM
Si32282-A-FM
Si32282-A-GM
Si32283-A-FM
Si32283-A-GM
Si32284-A-FM
Si32284-A-GM
Si32285-A-FM
Si32285-A-GM
Si32286-A-FM
Si32286-A-GM
Si32287-A-FM
Description
Wideband Dual FXS, ISI interface
Wideband Dual FXS, ISI interface
Wideband Dual FXS, ISI interface, DTMF
detection
Wideband Dual FXS, ISI interface, DTMF
detection
Wideband Dual FXS, PCM interface, dai-
sy-chain mode
Wideband Dual FXS, PCM interface, dai-
sy-chain mode
Wideband Dual FXS, PCM interface,
DTMF detection, daisy-chain mode
Wideband Dual FXS, PCM interface,
DTMF detection, daisy-chain mode
Wideband Dual FXS, ISI interface, Smart
Ringing
Wideband Dual FXS, ISI interface, Smart
Ringing
Wideband Dual FXS, ISI interface, DTMF
detection, Smart Ringing
Wideband Dual FXS, ISI interface, DTMF
detection, Smart Ringing
Wideband Dual FXS, PCM interface, dai-
sy-chain mode, Smart Ringing
Wideband Dual FXS, PCM interface, dai-
sy-chain mode, Smart Ringing
Wideband Dual FXS, PCM interface,
DTMF detection, daisy-chain mode,
Smart Ringing
Wideband Dual FXS, PCM interface,
DTMF detection, daisy-chain mode,
Smart Ringing
Package Type
QFN48
2
QFN48
2
QFN48
2
QFN48
2
QFN56
2
QFN56
2
QFN56
2
QFN56
2
QFN48
2
QFN48
2
QFN48
2
QFN48
2
QFN56
2
QFN56
2
QFN56
2
Max V
BAT
–106 V
–106 V
–106 V
–106 V
–106 V
–106 V
–106 V
–106 V
–106 V
–106 V
–106 V
–106 V
–106 V
–106 V
–106 V
Temperature
0 to 70 °C
–40 to 85 °C
0 to 70 °C
–40 to 85 °C
0 to 70 °C
–40 to 85 °C
0 to 70 °C
–40 to 85 °C
0 to 70 °C
–40 to 85 °C
0 to 70 °C
–40 to 85 °C
0 to 70 °C
–40 to 85 °C
0 to 70 °C
Si32287-A-GM
QFN56
2
–106 V
–40 to 85 °C
Note:
1. Adding the suffix "R" to the part number (e.g., Si32282-C-FMR) denotes tape and reel.
2. QFN - Quad-Flat No-leads
silabs.com
| Smart. Connected. Energy-friendly.
Preliminary Rev. 0.5 | 1
Smart.
Connected.
Energy-Friendly.
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Disclaimer
Silicon Laboratories intends to provide customers with the latest, accurate, and in-depth documentation of all peripherals and modules available for system and software implementers using
or intending to use the Silicon Laboratories products. Characterization data, available modules and peripherals, memory sizes and memory addresses refer to each specific device, and
"Typical" parameters provided can and do vary in different applications. Application examples described herein are for illustrative purposes only. Silicon Laboratories reserves the right to
make changes without further notice and limitation to product information, specifications, and descriptions herein, and does not give warranties as to the accuracy or completeness of the
included information. Silicon Laboratories shall have no liability for the consequences of use of the information supplied herein. This document does not imply or express copyright licenses
granted hereunder to design or fabricate any integrated circuits. The products are not designed or authorized to be used within any Life Support System without the specific written consent
of Silicon Laboratories. A "Life Support System" is any product or system intended to support or sustain life and/or health, which, if it fails, can be reasonably expected to result in significant
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