Si3210/Si3211/Si3212
Audio
Codec
Monitor A/D
A/D
A/D
D/A
DSP
D/A
SLIC DAC
Battery Sense
DC
AC
Control
Emitter Sense
Control
Σ
AC Sense
DC Sense
RAC
AC
Control
Loop
QDN
DC
Control
Loop
QP
CAC
RBP
RDC
RSE
RBAT
TIP or
RING
QN
RE
VBAT
Figure 15. Simplified ProSLIC Linefeed Architecture for TIP and RING Leads (One Shown)
Table 21. ProSLIC Linefeed Operations
LF[2:0]*
000
Linefeed State
Open
Description
TIP and RING tri-stated.
001
Forward Active
V
V
> V
> V
.
TIP
TIP
RING
RING
010
Forward On-Hook Transmission
TIP Open
; audio signal paths powered on.
011
TIP tri-stated, RING active; used for ground start.
Ringing waveform applied to TIP and RING.
100
Ringing
101
Reverse Active
V
V
> V
.
TIP
RING
RING
110
Reverse On-Hook Transmission
Ring Open
> V ; audio signal paths powered on.
TIP
111
RING tri-stated, TIP active.
Note: The Linefeed register (LF) is located in direct Register 64.
Preliminary Rev. 1.11
23
ETC [ ETC ]
