Specifications

Si2457/Si2434/Si2415
Rev. 0.91 65
Pin Descriptions: Si2457/34/15
Pin # Pin Name Description
1 CLKIN/XTALI Clock Input/Crystal Oscillator Pin.
This pin provides support for parallel-resonant, AT cut crystals. XTALI also acts
as an input in the event that an external clock source is used in place of a crystal.
A 4.9152 MHz crystal or 4.9152/27 MHz clock is required.
2XTALOCrystal Oscillator Pin.
This pin provides support for parallel-resonant AT-cut crystals. XTALO 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 digital supply voltage to the Si2457/34/15.
6, 20 GND Ground.
Connects to the system digital ground.
7,19 VDA, VDB Digital Rail.
Pin provides additional power supply voltage to the Si2457/34/15.
8RTS
/D7 Request-to-Send/Data Bit.
Request-to-send (for flow control) in serial mode. Bidirectional parallel bus data
bit 7 in parallel mode.
9RXD/RD
Receive Data/Read Enable.
Data output to DTE RXD pin in serial mode. Active low read enable pin 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
Si2457/34/15
CLKIN/XTALI
XTALO
CLKOUT/EECS/A0
FSYNC/D6
VD3.3
GND
VDA
RTS/D7
RXD/RD
TXD/WR
CTS/CS
RESET
AOUT/INT
RI/D1
SDI/EESD/D2
VDB
VD3.3
ESC/D3
DCD/D4
GND
SDO/EECLK/D5
INT/DO
C2A
C1A