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| 型號(hào)： | SI3230PPQX-EVB |
| 廠商： | Silicon Laboratories Inc |
| 文件頁數(shù)： | 20/108頁 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL W/DISCRETE INTERFACE |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 系列： | ProSLIC® |
| 主要目的： | 接口，模擬前端（AFE） |
| 已用 IC / 零件： | Si3230 |
| 已供物品： | 板，CD |
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Si3230
Preliminary Rev. 0.96
19
Not
Recommended
fo
r N
ew
D
esi
gn
s
order to monitor the linefeed current. RDC, RSE, and
RBAT provide access to these measuring points. The
sense circuitry is calibrated on-chip to guarantee
measurement
accuracy
with
standard
external
component
tolerances.
See
Calibration" on page 23 for details.
2.1.3. Linefeed Operation States
The ProSLIC linefeed has eight states of operation as
shown in Table 20. The state of operation is controlled
using the Linefeed Control register (direct Register 64).
The open state turns off all currents into the external
bipolar transistors and can be used in the presence of
fault conditions on the line and to generate Open Switch
Intervals (OSIs). TIP and RING are effectively tri-stated
with a dc output impedance of about 150 k
. The
ProSLIC can also automatically enter the open state if it
detects excessive power being consumed in the
external
bipolar
transistors.
See
more details.
In the forward active and reverse active states, linefeed
circuitry is on and the audio signal paths are powered
down.
In the forward and reverse on-hook transmission states
audio signal paths are powered up to provide data
transmission during an on-hook loop condition.
The TIP Open state turns off all control currents to the
external bipolar devices connected to TIP and provides
an active linefeed on RING for ground start operation.
The RING Open state provides similar operation with
the RING drivers off and TIP active.
The
ringing
state
drives
programmable
ringing
waveforms onto the line.
2.1.4. Loop Voltage and Current Monitoring
The ProSLIC continuously monitors the TIP and RING
voltages and external BJT currents. These values are
available in registers 78–89. Table 21 on page 20 lists
the values that are measured and their associated
registers. An internal A/D converter samples the
measured voltages and currents from the analog sense
circuitry and translates them into the digital domain. The
A/D updates the samples at an 800 Hz rate. Two
derived values are also reported—loop voltage and loop
current. The loop voltage, VTIP –VRING, is reported as a
1-bit sign, 6-bit magnitude format. For ground start
operation the reported value is the RING voltage. The
loop current, (IQ1 – IQ2 + IQ5 –IQ6)/2, is reported in a 1-
bit sign, 6-bit magnitude format. In RING open and TIP
open states the loop current is reported as (IQ1 – IQ2) +
(IQ5 –IQ6).
Table 20. ProSLIC Linefeed Operations
LF[2:0]*
Linefeed State
Description
000
Open
TIP and RING tri-stated.
001
Forward Active
VTIP > VRING.
010
Forward On-Hook Transmission
VTIP > VRING; audio signal paths powered on.
011
TIP Open
TIP tri-stated, RING active; used for ground start.
100
Ringing
Ringing waveform applied to TIP and RING.
101
Reverse Active
VRING > VTIP.
110
Reverse On-Hook Transmission
VRING > VTIP; audio signal paths powered on.
111
Ring Open
RING tri-stated, TIP active.
Note:
The Linefeed register (LF) is located in direct Register 64.
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