Specifications

Si2493
48 Rev. 1.3
8. Pin Descriptions: Si2493 (24-Pin Option)
Pin # Pin Name Description
1CLKIN/XTALIClock Input/Crystal Oscillator Pin.
Provides support for parallel resonant AT cut crystals. A 4.9152 MHz or
32.768 kHz crystal or a 32.768 kHz or 4.9152 or 27 MHz clock on XTALI is
required.
2XTALOCrystal Oscillator Pin.
Serves as the output of the crystal amplifier.
3 CLKOUT/EECS
/
A0
Clock Output/EEPROM Chip Select/Address Bit 0.
Clock output in serial mode. Active low read/write enable for SPI EEPROM in
serial mode when pin 4 is pulled low during powerup. Address Enable in parallel
mode.
4 FSYNC
/D6 Frame Sync/Data Bit.
Frame Sync output to codec in serial mode. Bidirectional parallel bus data bit 6 in
parallel mode.
5, 21 VD3.3 Digital Supply Voltage.
Provides the 3.3 V supply voltage to the Si2493.
6, 20 GND Ground.
Connects to the system digital ground.
7,19 VDA, VDB Regulator Voltage Reference.
Connects to an external capacitor and serves as the reference for the internal
voltage regulator.
8SS/RTS/D7 SPI Slave Select/Request to Send/Data Bit.
Active low slave select in SPI mode.
Active low request to send input used for flow control in UART mode. Bidirec-
tional parallel bus data bit 7 in parallel mode.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
Si2493
(24-Pin Option)
CLKIN/XTALI
XTALO
CLKOUT/EECS/A0
FSYNC/D6
VD3.3
GND
VDA
SS/RTS/D7
MISO/RXD/RD
MOSI/TXD/WR
SCLK/CTS/CS
RESET
AOUT/INT
RI/D1
SDI/EESD/D2
VDB
VD3.3
ESC/D3
DCD/D4
GND
SDO/EECLK/D5
INT/DO
C1A
C2A