
Si3216
Rev. 1.0 29
Not Recommended
f
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r N
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Figure 17. Simplified ProSLIC Linefeed Architecture for TIP and RING Leads (One Shown)
Table 22. ProSLIC Linefeed Operations
LF[2:0]* Linefeed State Description
000 Open TIP and RING tri-stated
001 Forward Active V
TIP
> V
RING
010 Forward On-Hook Transmission V
TIP
> V
RING
; audio signal paths enabled
011 TIP Open TIP tri-stated, RING active; used for ground start
100 Ringing Ringing waveform applied to TIP and RING
101 Reverse Active V
RING
> V
TIP
110 Reverse On-Hook Transmission V
RING
> V
TIP
; audio signal paths enabled
111 Ring Open RING tri-stated, TIP active
*Note: The Linefeed register (LF) is located in direct Register 64.
DSP
A/D
D/AD/A
A/D
DC
Control
AC
Control
DC
Control
Loop
AC
Control
Loop
Battery Sense
Emitter Sense
DC Sense
R
DC
R
SE
R
BAT
Q
DN
Q
P
Q
N
R
E
V
BAT
TIP or
RING
R
BP
R
AC
C
AC
AC Sense
Audio
Codec
Monitor A/D
SLIC DAC
On-ChipExternal Components
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