Si3232
D
UAL
P
ROGRAMMABLE
CMOS SLIC
WITH
L
INE
M
ONITORING
Features
Ideal for customer premise applications
Low standby power consumption:
<65 mW per channel
Internal balanced ringing to 65 V
rms
Software programmable parameters:
Ringing frequency, amplitude,
cadence, and waveshape
Two-wire ac impedance
DC loop feed (18–45 mA)
Loop closure and ring trip thresholds
Ground key detect threshold
Automatic switching of up to three
battery supplies
On-hook transmission
Loop or ground start operation with
smooth/abrupt polarity reversal
SPI bus digital interface with
programmable interrupts
3.3 V operation
GR-909 loop diagnostics and
loopback testing
12 kHz/16 kHz pulse metering
Lead-free/RoHS compatible
packages available
Ordering Information
See page 122.
U.S. Patent #6,567,521
Applications
Cable telephony
Wireless local loop
Voice over IP/voice over DSL
ISDN terminal adapters
U.S. Patent #6,812,744
Other patents pending
Description
The Si3232 is a low-voltage CMOS SLIC that offers a low-cost, fully software-
programmable, dual-channel, analog telephone interface for customer premise
(CPE) applications. Internal ringing generation eliminates centralized ringers and
ringing relays, and on-chip subscriber loop testing allows remote line card and
loop diagnostics with no external test equipment or relays. The Si3232 performs
all programmable SLIC functions in compliance with all relevant LSSGR, ITU, and
ETSI specifications; all high-voltage functions are performed by the Si3200
linefeed interface IC. The Si3232 operates from a single 3.3 V supply and
interfaces to a standard SPI bus digital interface for control. The Si3200 operates
from a 3.3 V supply as well as high-voltage battery supplies up to 100 V. The
Si3232 is available in a 64-pin thin quad flat package (TQFP), and the Si3200 is
available in a thermally-enhanced 16-pin small-outline (SOIC) package.
Functional Block Diagram
INT RESET
CS
SCLK
SDI
SDO
VRXPa
VRXNa
VTXPa
VTXNa
VTXPb
VTXNb
VRXPb
VRXNb
VCM
PCLK
Si3232
Ring Source
Linefeed
& Monitor
SPI
Control
Interface
Si3200
Linefeed
Interface
TIP
RING
Ring Source
Linefeed
& Monitor
Si3200
Linefeed
Interface
TIP
RING
PLL
FSYNC
Preliminary Rev. 0.96 2/05
Copyright © 2005 by Silicon Laboratories
Si3232
This information applies to a product under development. Its characteristics and specifications are subject to change without notice.
SILABS [ SILICON LABORATORIES ]
