SI2493-C-FS Silicon Laboratories Inc, SI2493-C-FS Datasheet - Page 108

• 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

AN93
To use voice mode, registers U71 and U59 must be
properly configured.
Setting U59 = 0001h enables the Si24XX TDMA
interface. When U71 is set to the value, 0011h, a 16-bit
voice sample will be transmitted from the Si3000
through the Si2493/57/34/15/04 and DAA to the remote
device. Likewise, an analog signal from the remote
device will pass through the DAA where it is converted
to a 16-bit voice sample, the Si24XX, and finally the
Si3000, where it is converted back to the analog receive
signal.
The modem must be the master, and it outputs FSYNC
and MCLK to the Si3000. In this example, the Si3000
has its digital TDMA interface configured as the Slave
Serial Mode by adding a 50 k Ω pull-down resistor to the
SDO pin and a pull-up 50 k Ω resistor to the SCLK pin.
108
R62
47 k
VDD
N O T E : D6 (PIN 4) MUST NOT HAVE PULLDOWN RESISTOR
DCDb
ESC
AOUT
INTb
RIb
RTSb
RXD
TXD
CTSb
RESETb
R63
47 k
SPKR_R
MIC_BIAS
HDST
Figure 22. Si2457/Si3000 Connection
VDD
24
23
22
15
16
17
18
10
11
12
4
3
8
9
Rev. 0.9
EECLK/D5
DCD/D4
ESC/D3
AOUT/INT
D6
INT/D0
RI/D1
EESD/D2
CLKOUT/EECS/A0
RTS/D7
RXD/RD
TXD/WR
CTS/CS
RESET
1
2
3
4
5
6
7
8
C50
Si3000
SPKR_R
MIC_BIAS
HDST
SDI
SDO
FSYNC
MCLK
SCLK
In this mode, the Si3000’s MCLK is driven by the
2048 kHz clock from Si2493/57/34/15/04. The FSYNC
has an 8 kHz pulse input. The bit clock is 2048/
8 = 256 bits per frame sync. Refer to the Si3000
documentation for further details.
To send control information to the Si3000, the Si2493/
57/34/15/04 modem chip provides a PCM control port,
0x004B, which allows the user to send control words
across by using the AT memory write command. See
Table 76 for details. Wait for the “OK” approximately
300 msec after each command. When a connection is
established, the “AT.T” command is used to generate
the DTMF tone of a number; e.g., ATDT3<CR> will
generate a number 3 DTMF tone without the need for
an external DTMF generator.
C51
CLKIN/XTALI
U3
Si2457/34/15/04
SPKR_L
RESET
MIC_IN
LINEO
C52
LINEI
XTALO
GND
VA
VD
C1A
C2A
C53
16
15
14
13
12
11
10
9
1
2
14
13
C66
0.1 uF
VDD
R61
0
SPKR_L
LINEO
LINEI
M I C _IN
XTALI
XTALO
C1A
C1B
C68
0 . 1 uF