si2439-a-gm Silicon Laboratories, si2439-a-gm Datasheet - Page 56

• Manufacturer Part Number: si2439-a-gm
• Description: V.92 And V.34 Isomodem With Global Daa
• Manufacturer: Silicon Laboratories

Si2494/39
56
Pin #
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
CTS, SCLKC, CS Clear to Send/Serial Data Clock/Chip Select.
TXD/MOSI/WR
RXD/MISO/RD
RTS, SS, D7
GPIO11, A0
Pin Name
EECLK
AOUTb
RESET
AOUT
EECS
GND
VDD
C2A
C1A
NC
RI
Table 16. Si2494/39 Pin Descriptions (Continued)
EEPROM Chip Select.
Active low read/write enable for SPI EEPROM.
EEPROM Clock.
Clock for SPI EEPROM.
Audio Output B.
PWM audio output B when differential audio output is enabled.
Audio Output.
PWM audio output.
Reset Input.
An active low input that is used to reset all control registers to a defined initialized
state.
Isolation Capacitor 2A.
Connects to one side of the isolation capacitor, C2.
Isolation Capacitor 1A.
Connects to one side of the isolation capacitor, C1.
Ring Indicator.
The RI on (active low) indicates the presence of an ON segment of a ring signal
on the telephone line.
GPIO/Address Bit 0.
General purpose input output pin 11. Address Enable in parallel mode.
Signals that the Si2494/39 is ready to receive more digital data on the TXD pin in
data mode. Serial data clock input in SPI mode. Active low chip select in parallel
mode.
Receive Data/Master In Slave Out/Read Enable.
Data output to DTE TXD pin in serial mode. Serial data output from modem in SPI
mode. Active low read enable pin in parallel mode.
Transmit Data/Master Out Slave In/Write Enable.
Data input from DTE TXD pin in serial mode. Serial data input to modem in SPI
mode. Active low write enable pin in parallel mode.
Request to Send/SPI Slave Select/Data Bit.
Active low request to send input used for flow control in UART mode. Active low
slave select in SPI mode. Bidirectional parallel bus data bit 7 in parallel mode.
Ground.
Connects to the system digital ground.
Digital Supply Voltage.
Provides the 3.3V supply voltage to the Si2494/39,
No connect.
Rev. 1.0
Description