SI3201-FS View Datasheet(PDF) - Silicon Laboratories

Part Name

Description

Manufacturer

SI3201-FS

PROSLIC® PROGRAMMABLE CMOS SLIC WITH RINGING/BATTERY VOLTAGE GENERATION

Silicon Laboratories 

Si3230

order to monitor the linefeed current. RDC, RSE, and The TIP Open state turns off all control currents to the

RBAT provide access to these measuring points. The external bipolar devices connected to TIP and provides

sense circuitry is calibrated on-chip to guarantee an active linefeed on RING for ground start operation.

measurement accuracy with standard

component tolerances. See "2.1.9.

Calibration" on page 23 for details.

2.1.3. Linefeed Operation States

external

Linefeed

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.

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 kΩ. The

ProSLIC can also automatically enter the open state if it

detects excessive power being consumed in the

external bipolar transistors. See "2.1.5. Power

Monitoring and Line Fault Detection" on page 20 for

more details.

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

In the forward active and reverse active states, linefeed loop current, (IQ1 – IQ2 + IQ5 –IQ6)/2, is reported in a 1-

circuitry is on and the audio signal paths are powered bit sign, 6-bit magnitude format. In RING open and TIP

down.

open states the loop current is reported as (IQ1 – IQ2) +

In the forward and reverse on-hook transmission states (IQ5 –IQ6).

audio signal paths are powered up to provide data

transmission during an on-hook loop condition.

Table 20. ProSLIC Linefeed Operations

LF[2:0]*

000

001

010

011

100

101

110

111

Linefeed State

Open

Forward Active

Forward On-Hook Transmission

TIP Open

Ringing

Reverse Active

Reverse On-Hook Transmission

Ring Open

Description

TIP and RING tri-stated.

VTIP > VRING.

VTIP > VRING; audio signal paths powered on.

TIP tri-stated, RING active; used for ground start.

Ringing waveform applied to TIP and RING.

VRING > VTIP.

VRING > VTIP; audio signal paths powered on.

RING tri-stated, TIP active.

Note: The Linefeed register (LF) is located in direct Register 64.

Preliminary Rev. 0.96

19

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