cx20493-35/app Conexant Systems, Inc., cx20493-35/app Datasheet - Page 64

• Manufacturer Part Number: cx20493-35/app
• Description: With Cx20493 Smartdaa?
• Manufacturer: Conexant Systems, Inc.

Table 3-12. CX20442 VC Pin Signal Definitions
3-32
VDD
MAVDD
VSS
MAVSS
VSUB
POR
SET3V_BAR2
SLEEP
M_CLKIN
M_SCK
M_CNTRL_SIN
M_STROBE
M_TXSIN
M_RXOUT
M_MIC_IN
M_SPKR_OUT
M_LINE_OUTP
M_LINE_IN
CX81801-7x/8x SmartV.XX Modem in 128-Pin LQFP with CX20493 in 32-Pin LQFP Data Sheet
Label
17, 25
5
28
6
27
4
26
1
19
21
18
23
20
22
13
3
9
14
Pin
P
P
G
G
G
I
I
I
I
O
I
O
I
O
I
O
O
I
I/O
Microphone/Speaker Interface
O(DF)
PWR
PWR
GND
AGND
GND
Itpu
Itpu
Itpd
Itpd
Ot2
Itpd
Ot2
Itpd
Ot2
I(DA)
O(DF)
I(DA)
I/O Type
Handset/Headset Interface
CX81801 Interconnect
System Signals
Conexant
Digital Power Supply. Connect to +3.3V and digital circuits power
supply filter.
Analog Power Supply. Connect to +3.3V and analog circuits
power supply filter.
Digital Ground. Connect to GND.
Analog Ground. Connect to AGND.
Analog Ground. Connect to AGND.
Power-On Reset. Active low reset input. Connect to Host
RESET# or reset circuit.
Set +3.3V Analog Reference. Connect to GND.
IA Sleep. Active high sleep input. Connect to CX81801 IASLEEP
pin.
Master Clock Input. Connect to CX81801 M_CLK pin.
Serial Clock Output. Connect to CX81801 V_SCLK pin.
Control Input. Connect to CX81801 V_CTRL pin.
Serial Frame Sync. Connect to CX81801 V_STROBE pin.
Serial Transmit Data. Connect to CX81801 V_TXSIN pin.
Serial Receive Data. Connect to CX81801 V_RXOUT pin.
Microphone Input. Single-ended analog input from the
microphone circuit.
Modem Speaker Analog Output. The M_SPKR_OUT analog
output reflects the received analog input signal. The
M_SPKR_OUT on/off and three levels of attenuation are controlled
by bits in DSP RAM. When the speaker is turned off, the
M_SPKR_OUT output is clamped to the voltage at the VC pin. The
M_SPKR_OUT output can drive an impedance as low as 300 Ω. In
a typical application, the M_SPKR_OUT output is an input to an
external LM386 audio power amplifier.
Telephone Handset Out (TELOUT). Single-ended analog data
output to the telephone handset circuit. The output can drive a
300 Ω load.
Telephone Handset Out (TELIN). Single-ended analog data input
from the telephone handset circuit.
Signal Name/Description
102247B