SI2493FT08-EVB Silicon Laboratories Inc, SI2493FT08-EVB Datasheet - Page 10

• Manufacturer Part Number: SI2493FT08-EVB
• Description: BOARD EVAL SI2493 + SI3008 24PIN
• Manufacturer: Silicon Laboratories Inc
• Series: ISOmodem®r

Specifications of SI2493FT08-EVB

• Main Purpose: Telecom, Data Acquisition Arrangement (DAA)
• Utilized Ic / Part: Si2493
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Secondary Attributes: -
• Embedded: -
• Primary Attributes: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Global ISOmodem-EVB
Figure 10 shows the actual circuit connection between the Si2493/57/34/15/04 and the Si3000.
To use voice mode register U71 and data memory location 0x0059 must be properly configured.
Setting data memory 0x0059 = 0x0001 enables the Si24XX TDMA interface. When U71 is set to the value 0x0011
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.
In this example, the Si3000 has its digital TDMA interface configured as the Slave Serial Mode by adding a 50 kΩ
pull-down resistor to SDO pin and a pull-up 50 kΩ resistor to SCLK pin. 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 that allows the user to send control words across by using the AT memory write command. See Table 4. for
details. Wait for the “OK” (approximately 300 ms after each command). When a connection is established, the “AT.”
command is used to generate the DTMF tone of a number; For example, AT.3<CR> will generate a number 3
DTMF tone without the need for an external DTMF generator. See “Voice Mode Example” for details.
10
R62
47 k
Figure 10. Circuit Connection between the Si2493/57/34/15/04 and the Si3000
VDD
N O T E : D6 (PIN 4) MUST NOT HAVE PULLDOWN RESISTOR
DCDb
ESC
AOUT
I N T b
RIb
RTSb
RXD
TXD
CTSb
R E S E T b
R63
47 k
SPKR_R
MIC_BIAS
HDST
VDD
24
23
22
15
16
17
18
10
11
12
4
3
8
9
Rev. 0.6
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
C51
CLKIN/XTALI
U3
Si2493/57/34/15/04
SPKR_L
RESET
MIC_IN
LINEO
C52
LINEI
X T A L O
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
X T A L O
C1A
C1B
C68
0 . 1 uF