SI2493-C-FS Silicon Laboratories Inc, SI2493-C-FS Datasheet - Page 95

• Manufacturer Part Number: SI2493-C-FS
• Description: IC ISOMODEM SYSTEM-SIDE 16SOIC
• Manufacturer: Silicon Laboratories Inc

Specifications of SI2493-C-FS

• 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: UART
• Voltage - Supply: 3 V ~ 3.6 V
• Mounting Type: Surface Mount
• Package / Case: 16-SOIC (3.9mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

3.3.44. U7A (GENA)
U7A is a bit-mapped register. U7A resets to 0x0000.
Bits 15:8 and 5:3 are reserved.
Bit 7 (DOP) is used in a method to determine whether a
phone line supports DTMF or pulse only dialing. See
"3.5.11. Pulse/Tone Dial Decision" on page 125 for
details.
Bit 6 (ADD) attempts DTMF dial, then falls back to pulse
dialing if unsuccessful. First digit is dialed as DTMF. If a
dial tone is still present after two seconds, the Si2493/
57/34/15/04 redials the first digit and remaining digits as
pulse. If a dial tone is not present after two seconds, the
3.3.45. U7C (GENC)
U7C is a bit-mapped register with bits 15:5 and bits 3:1
reserved. U7C resets to 0x0000 with a power-on or
manual reset.
Bit 4 (RIGPO) is output on RI (Si2493/57/34/15/04
pin 15) when U7C[0] (RIGPOEN) = 1
*Note: When HDLC or FAST is set, the \N0 (Wire mode) setting must be used.
15:8
15:6
5:0
Bit
5:3
Bit
7
6
2
1
0
Reserved Read returns zero.
Reserved Read returns zero.
Reserved Read returns zero.
Reserved Read returns zero.
Name
Name
HDLC
LVCS
FAST
DOP
ADD
0 = Normal ATDTW operation.
1 = Use ATDTW for pulse/tone dial detection (see "3.5.11. Pulse/Tone Dial Decision" on page
125 for details).
Adaptive Dialing.
1 = Enable
0 = Disable
Synchronous Mode.
0 = Normal asynchronous mode.
1 = Transparent HDLC mode.*
Fast Connect.
0 = Normal modem handshake timing per ITU/Bellcore standards.
1 = Fast connect modem handshake timing.*
Function
Line Voltage Current Sense.
On-Hook = Voltage Monitor (2.75 V/bit).
Off-Hook = Loop Current Monitor (3 mA/bit).
b
. This allows the
Table 65. U79 Bit Map
Table 66. U7A Bit Map
Rev. 0.9
Si2493/57/34/15/04 dials the remaining digits as DTMF.
Bit 1 (HDLC) controls whether the normal asynchronous
mode (default) is used or the transparent HDLC mode is
enabled. See "3.1.6. Legacy Synchronous DCE Mode/
V.80 Synchronous Access Mode" on page 23 for more
details on these modes.
Bit 0 controls whether the normal ITU/Bellcore modem
handshake
handshake is used. Fast connect is typically used in
specialized
terminals, where it is important to rapidly connect and
transfer a small amount of data (see Table 66).
RI pin to be configured as a general-purpose output pin
under host processor control.
Bit 0 (RIGPOEN)=0 (default) allows RI (Si2493/57/34/
15/04 pin 15) to indicate a valid ring signal. When Bit
0 = 1
Function
b
, RI outputs the value of RIGPO. (See Table 67.)
(default)
applications,
or
a
such
special
as
fast
point-of-sale
AN93
connect
95