Si2401
®
V.22BIS ISOMODEM WITH INTEGRATED GLOBAL DAA
Features
Data modem formats
z 2400 bps: V.22bis
Integrated third-generation DAA
z Fewer external components required
z Over 5000 V capacitive isolation
z Parallel phone detect
z 1200 bps: V.22, V.23, Bell 212A
z 300 bps: V.21, Bell 103
z Fast connect and V.23 reversing
z SIA and other security protocols
27 MHz CLKIN support
Caller ID detection and decoding
UART with flow control
z Globally-compliant line interface
AT command set support
Call progress support
3.3 V Power
Ordering Information
Lead-free, RoHS-compliant
See page 72.
packages
Applications
Pin Assignments
Si2401
Set-top boxes
Point-of-sale
ATM terminals
Security systems
Medical monitoring
Power meters
1
16 GPIO1/EOFR
15 GPIO2/CD
14 GPIO3/ESC
CLKIN/XTALI
XTALO
Description
2
3
The Si2401 ISOmodem® is a complete, two-chip 2400 bps modem integrating
Silicon Labs’ third-generation direct access arrangement (DAA), which provides a
globally-programmable telephone line interface with an unprecedented level of
integration. Available in two 16-pin SOIC packages, this compact solution
eliminates the need for a separate DSP data pump, modem controller, codec,
isolation transformer, relay, opto-isolators, and 2–4 wire hybrid. The Si2401
provides conventional data formats at connect rates of up to 2400 bps with full-
duplex operation over the Public Switched Telephone Network (PSTN).
Additionally, the Si2401 is fully-programmable to meet global standards with a
single design. Other features include fast connect times for electronic point-of-
sale (EPOS) applications and alarm protocols for security systems. The device is
ideal for embedded modem applications due to its small size, low external
component count, and low power consumption.
GPIO5/RI
VD
4
5
6
7
8
13
12
VA
GND
RXD
TXD
CTS
11 GPIO4/INT/AOUT
10 C1A
9
C2A
RESET
Si3010
1
16
DCT2
QE
2
3
DCT
15 IGND
14 DCT3
RX
IB
4
5
6
7
8
13
12
QB
QE2
C1B
C2B
Functional Block Diagram
11 SC
VREG
10 VREG2
9
RNG2
RNG1
Si2401
Si3010
RX
RXD
TXD
µ Controller
(AT Decoder,
Call Progress)
U.S. Patent #5,870,046
U.S. Patent #6,061,009
Other patents pending
IB
SC
CTS
Hybrid, AC
and DC
Terminations
DCT
VREG
RESET
VREG2
DCT2
DCT3
Isolation
Interface
EOFR/GPIO1
DSP
(Data Pump)
CD/GPIO2
ESC/GPIO3
INT/GPIO4
RI/GPIO5
Control
Interface
RNG1
RNG2
QB
QE
QE2
Ring Detect
Off-Hook
XTALI
XOUT
Clock
Interface
Rev. 1.0 12/05
Copyright © 2005 by Silicon Laboratories
Si2401
This information applies to a product under development. Its characteristics and specifications are subject to change without notice.