Si3228x: ProSLIC
®
Single-Chip Dual FXS
Solution
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.
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
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
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
Channel A
RING
TIP
• DC current loop feed (10–45 mA)
• Loop closure and ring trip thresholds
• Ground key detect threshold
• Flexible integrated tracking DC-DC
controller supporting patent-pending low-
cost capacitive boost configuration
• DTMF Generation
• DTMF Detection (Si32281/3/5/7)
• 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
Host Interface
Line Diagnostics
Line Diagnostics
PCLK / PSCLK
Linefeed
DSP
SLIC
Linefeed
Control
Linefeed
Monitor
Channel B
RING
TIP
PLL
DC-DC Controller
Si3228x
Functional Block Diagram
silabs.com
| Building a more connected world.
Rev. 1.0
Si3228x: ProSLIC
®
Single-Chip Dual FXS Solution
Ordering Guide
1. Ordering Guide
Table 1.1. Si3228x Ordering Guide
P/N
1
Si32280-A-FM
Si32280-A-GM
Si32281-A-FM
Description
Wideband Dual FXS, ISI
interface
Wideband Dual FXS, ISI
interface
Wideband Dual FXS, ISI
interface, DTMF detec-
tion
Wideband Dual FXS, ISI
interface, DTMF detec-
tion
Wideband Dual FXS,
PCM interface, daisy-
chain mode
Wideband Dual FXS,
PCM interface, daisy-
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 detec-
tion, Smart Ringing
Wideband Dual FXS, ISI
interface, DTMF detec-
tion, Smart Ringing
Wideband Dual FXS,
PCM interface, daisy-
chain mode, Smart Ring-
ing
Wideband Dual FXS,
PCM interface, daisy-
chain mode, Smart Ring-
ing
Wideband Dual FXS,
PCM interface, DTMF
detection, daisy-chain
mode, Smart Ringing
Package Type
QFN48
2
QFN48
2
QFN48
2
Max V
BAT
–106 V
–106 V
–106 V
Temperature
0 to 70 °C
–40 to 85 °C
0 to 70 °C
Si32281-A-GM
QFN48
2
–106 V
–40 to 85 °C
Si32282-A-FM
QFN56
2
–106 V
0 to 70 °C
Si32282-A-GM
QFN56
2
–106 V
–40 to 85 °C
Si32283-A-FM
QFN56
2
–106 V
0 to 70 °C
Si32283-A-GM
QFN56
2
–106 V
–40 to 85 °C
Si32284-A-FM
Si32284-A-GM
Si32285-A-FM
QFN48
2
QFN48
2
QFN48
2
–106 V
–106 V
–106 V
0 to 70 °C
–40 to 85 °C
0 to 70 °C
Si32285-A-GM
QFN48
2
–106 V
–40 to 85 °C
Si32286-A-FM
QFN56
2
–106 V
0 to 70 °C
Si32286-A-GM
QFN56
2
–106 V
–40 to 85 °C
Si32287-A-FM
QFN56
2
–106 V
0 to 70 °C
silabs.com
| Building a more connected world.
Rev. 1.0 | 2
Si3228x: ProSLIC
®
Single-Chip Dual FXS Solution
Ordering Guide
P/N
1
Si32287-A-GM
Description
Wideband Dual FXS,
PCM interface, DTMF
detection, daisy-chain
mode, Smart Ringing
Wideband Dual FXS, ISI
interface, customer-spe-
cific
Wideband Dual FXS, ISI
interface, DTMF detec-
tion, customer-specific
Wideband Dual FXS,
PCM interface, daisy-
chain mode, customer-
specific
Wideband Dual FXS,
PCM interface, DTMF
detection, daisy-chain
mode, customer-specific
Wideband Dual FXS, ISI
interface, Smart Ringing,
customer-specific
Wideband Dual FXS, ISI
interface, DTMF detec-
tion, Smart Ringing, cus-
tomer-specific
Wideband Dual FXS,
PCM interface, daisy-
chain mode, Smart Ring-
ing, customer-specific
Wideband Dual FXS,
PCM interface, DTMF
detection, daisy-chain
mode, Smart Ringing,
customer-specific
Wideband Dual FXS, ISI
interface, customer-spe-
cific
Wideband Dual FXS, ISI
interface, DTMF detec-
tion, customer-specific
Wideband Dual FXS,
PCM interface, daisy-
chain mode, customer-
specific
Wideband Dual FXS,
PCM interface, DTMF
detection, daisy-chain
mode, customer-specific
Wideband Dual FXS, ISI
interface, Smart Ringing,
customer-specific
Package Type
QFN56
2
Max V
BAT
–106 V
Temperature
–40 to 85 °C
Si32280-A-ZM1
QFN48
2
–106 V
0 to 70 °C
Si32281-A-ZM1
QFN48
2
–106 V
0 to 70 °C
Si32282-A-ZM1
QFN56
2
–106 V
0 to 70 °C
Si32283-A-ZM1
QFN56
2
–106 V
0 to 70 °C
Si32284-A-ZM1
QFN48
2
–106 V
0 to 70 °C
Si32285-A-ZM1
QFN48
2
–106 V
0 to 70 °C
Si32286-A-ZM1
QFN56
2
–106 V
0 to 70 °C
Si32287-A-ZM1
QFN56
2
–106 V
0 to 70 °C
Si32280-A-ZM2
QFN48
2
–106 V
0 to 70 °C
Si32281-A-ZM2
QFN48
2
–106 V
0 to 70 °C
Si32282-A-ZM2
QFN56
2
–106 V
0 to 70 °C
Si32283-A-ZM2
QFN56
2
–106 V
0 to 70 °C
Si32284-A-ZM2
QFN48
2
–106 V
0 to 70 °C
silabs.com
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Rev. 1.0 | 3
Si3228x: ProSLIC
®
Single-Chip Dual FXS Solution
Ordering Guide
P/N
1
Si32285-A-ZM2
Description
Wideband Dual FXS, ISI
interface, DTMF detec-
tion, Smart Ringing, cus-
tomer-specific
Wideband Dual FXS,
PCM interface, daisy-
chain mode, Smart Ring-
ing, customer-specific
Wideband Dual FXS,
PCM interface, DTMF
detection, daisy-chain
mode, Smart Ringing,
customer-specific
Package Type
QFN48
2
Max V
BAT
–106 V
Temperature
0 to 70 °C
Si32286-A-ZM2
QFN56
2
–106 V
0 to 70 °C
Si32287-A-ZM2
QFN56
2
–106 V
0 to 70 °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
Table 1.2. Evaluation Kit Ordering Guide
Part Number
Si32285ACB20SL0EVB
Si32287ACB20SL0EVB
Description
2 FXS evb with lowest-cost capacitive
boost dc-dc converter for Si32280/1/4/5
2 FXS evb with lowest-cost capacitive
boost dc-dc converter for Si32282/3/6/7
V
BAT
Max
–100 V
–100 V
1.1 Product Identification
The product identification number is a finished goods part number or is specified by a finished goods part number, such as a special
customer part number.
Si32282-A-FMR
Product Designator
Revision
Shipping Option
Blank = Trays
R = Tape and Reel
Package Type
M = QFN
Part Type / Lead Finish
F = Commercial / RoHS-Compliant
G = Industrial / RoHS-Compliant
Figure 1.1. Example Product Identification Number
silabs.com
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Rev. 1.0 | 4
Table of Contents
1. Ordering Guide
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
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. 4
1.1 Product Identification .
2. Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3. Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
4. FXS Features
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
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.21
.21
.21
.21
.21
.22
.22
.23
.23
.23
.23
.23
.23
.24
.24
.24
.25
.26
.26
.26
.26
.27
.31
.35
.36
.37
.38
4.1 DC Feed Characteristics.
4.2 Linefeed Operating States .
4.3 Line Voltage and Current Monitoring.
4.5 Thermal Overload .
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4.4 Power Monitoring and Power Fault Detection .
4.6 Loop Closure Detection .
4.7 Ground Key Detection
4.8 Ringing Generation
4.9 Polarity Reversal .
.
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4.10 Two-Wire Impedance Synthesis .
4.11 Transhybrid Balance Filter
4.12 Tone Generators .
4.14 Pulse Metering
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4.13 DTMF Detection (Si32281/3/5/7 Only).
4.15 DC-DC Controller
4.16 Wideband Audio .
4.17 Test Facilities .
.
5. System Interfaces
. . . . . . . . . . . . . . . . . . . . . . . . . . . .26
5.1 SPI Control Interface .
5.2 PCM Interface and Companding .
5.3 Integrated Serial Interface .
5.4 Input/Output Voltage .
.
.
6. Pin Descriptions
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
6.1 Si32280/1/4/5 7x7 mm Pinout .
6.2 Si32282/3/6/7 8x8 mm Pinout .
7. Packaging
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
7.1 Package Outline: 48-Pin QFN .
7.2 Package Outline: 56-Pin QFN .
7.3 Land Pattern: 48-Pin QFN .
7.4 Land Pattern: 56-Pin QFN .
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