SI2493-C-FT Silicon Laboratories Inc, SI2493-C-FT Datasheet - Page 133

• Manufacturer Part Number: SI2493-C-FT
• Description: 56 KBPS, V.92 ISOMODEM SYSTEM-SIDE - LEAD-FREE TSSOP 0 TO 7
• Manufacturer: Silicon Laboratories Inc

Specifications of SI2493-C-FT

• Mfg Application Notes: SI2493/57/34/15/04, Appl Note AN93
• Data Format: V.21, V.22, V.23, V.29, V.32, V.34, V.90, V.92, Bell 103, Bell 212A
• Baud Rates: 56k
• Interface: Parallel
• Voltage - Supply: 3 V ~ 3.6 V
• Mounting Type: Surface Mount
• Package / Case: 24-TSSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

3.5.19. Testing
This section contains information about using the
Si2493/57/34/15/04
suggestions for board-level testing. Special test
commands and methods useful for regulatory testing
are presented.
3.5.19.1. Self Test
The Si2493/57/34/15/04’s advanced design provides
the system manufacturer with an enhanced ability to
determine system functionality during production tests
and to support end-user diagnostics. In addition to local
echo, a loopback mode exists allowing increased
coverage of system components. For the loopback test
mode, a line-side power source is required. While a
standard phone line can be used, the test circuit shown
in Figure 23 is adequate.
The AT&Tn command, in conjunction with the AT&Hn
command, performs a loopback self test of the modem.
AT&Hn determines the modulation used for the test
(V.22bis, V.32bis, etc). If an AT&Hn command is not
issued just prior to the start of the test, the default or
<Value>
Si3018
0
1
2
RING
Table 90. AT+PSS Parameters
TIP
Figure 23. Loop Test Circuit
The DCEs decide whether or not to use
the short startup procedures. The short
startup procedures shall only be used if
enabled by the +PQC command.
Forces the use of the short startup proce-
dures on the next and subsequent con-
nections if they are enabled by the +PQC
command.
Forces the use of the full startup proce-
dures on the next and subsequent con-
nections independent of the setting of the
+PQC command.
V
TR
–
+
built-in
10 μF
600 Ω
Description
self-test
features
>20 mA
I
L
and
Rev. 0.9
previously-selected modulation is used. The modulation
options and defaults are listed in Table 19 on page 42.
The test is started with an AT&T2 or AT&T3 command.
During the test, the modem is in data mode. To end the
test, you must escape data mode using one of the
“Escape” methods, such as “+++”, and end the test with
AT&T0.
The AT&T2 command initiates a test loop from the DSP
through the DAA interface circuit of the Si2493/57/34/
15/04. Transmit data is returned to the DSP through the
receive channel. In the parallel mode, the transmit data
is passed to the receiver via Parallel Register 0. AT&T2
tests only the Si2493/57/34/15/04 chip, not the Si3018/
10.
The AT&T3 command initiates a test loop from the DSP
through the DAA interface, the ISOcap™ interface, the
Si3018/10, and the hybrid circuit. This test exercises the
Si2493/57/34/15/04, the Si3018/10, and many external
components. A phone line termination with loop current
and no dial tone is required for this test since it involves
the line-side chip (Si3018/10) and the hybrid. The
modem is off-hook during this test. The AT&T3 mode is
useful during emitted and conducted radiation testing.
Set U62(DL) [1] = 1, and issue the AT&T3 command to
test the ISOcap link only.
The AT\U command is also useful as a production test.
This command places a 25 ms low pulse on RI (Si2493/
57/34/15/04, pin 17) and DCD (Si2493/57/34/15/04,
pin 23). It also makes INT (Si2493/57/34/15/04, pin 16)
the inverse of ESC (Si2493/57/34/15/04, pin 22) and
RTS (Si2493/57/34/15/04, pin 8) the inverse of CTS
(Si2493/57/34/15/04,
command can be used to verify the connection of these
pins to the circuit board. This command is terminated by
resetting the Si2493/57/34/15/04.
3.5.19.2. Board Test
The modem and DAA chips come from Silicon
Laboratories 100% functionally-tested on automatic test
equipment to guarantee compliance with the published
chip specifications. The functionality of a finished
product containing an ISOmodem chipset depends on
not only the functionality of the modem chipset after
assembly but also on discrete parts and product-related
software. Therefore, finished product test requirements
and procedures depend on the manufacturer and the
product. Consequently, no universal final test procedure
can be defined.
Testing the modem in a finished product is done for
several reasons. First, it is important to be sure the
modem chipset and peripheral components were
installed correctly during assembly and were not
damaged. Second, it is necessary to be sure the correct
pin 11).
Sending
AN93
the
AT\U
133