Z02215
Single Chip Modem with Integrated Controller, Data Pump, and AFE
7
Table 1. Pin Descriptions (Continued)
Symbol
RXI+
PLCC LQFP
Pin # Pin #
16
43
Function
Receive
Differential
Analog Output
Positive
Analog Power
Input/
Output
Output
Speaker Mute
Control
Ring Detect
Input Line
Current Sense
Output
Input
I
2
C EEPROM Data.
I
2
C EEPROM Clock.
Controls speaker muting.
Signals the presence of a ring signal on the
line.The LCS_CHK input is used to detect when
a parallel phone is off-hook before dialing or
when a parallel phone has been picked up while
connected. In either case when LCS goes Low,
the connection attempt is dropped with a NO
CARRIER message.
Direction Description
Analog
Input
These are the analog inputs from the DAA.
AV
DD
17
44
1
2
3
4
EE_DATA 18
EE_CLK
MUTE
RDET/
LCS
19
20
21
V
DD
D
GND
22
23
5
6
7
Digital Power
Digital Ground
Line Current
Sense
Output
Output
This signal is used to enable the Line Current
Sense circuits in the DAA when checking for
parallel phone off-hook condition prior to taking
the phone line off-hook.
This signal is used to turn on the Caller ID relay
in the DAA.
SHTREL works in conjunction with pulse dial
make/break.
It offers extra-low resistance
across the tip and ring. When all relays are
closed, SHRTEL provides 100 Ohms (Low)
instead of 600 Ohms.
This signal is used to turn on the off-hook relay
in the DAA.
LCS_CHK 24
CID
SHTREL
25
26
8
9
Caller ID Relay Output
Pulse Dial
Shunt Relay
Output
Output
OH
D
GND
27
28
10
11
Off-Hook Relay Output
Output
Digital Ground
PS001907-0904
Pin Descriptions
ZILOG [ ZILOG, INC. ]
