SI3232 View Datasheet(PDF) - Silicon Laboratories

Part Name

Description

Manufacturer

SI3232

DUAL PROGRAMMABLE CMOS SLIC WITH LINE MONITORING

Silicon Laboratories 

Si3232

Table 13. Register and RAM Locations used for Linefeed Control

Parameter

Linefeed

Linefeed Shadow

Battery Feed Control

Loop Current Limit

On-Hook Line Voltage

Common Mode Voltage

VOC Delta for Off-Hook

VOC Delta Threshold, Low

VOC Delta Threshold, High

Overhead Voltage

Ringing Overhead Voltage

VOC During Battery Tracking

Register /

RAM

Mnemonic

LINEFEED

LINEFEED

RLYCON

ILIM

VOC

VCM

VOCDELTA

VOCLTH

VOCHTH

VOV

VOVRING

VOCTRACK

Register/RAM Bits

LF[2:0]

LFS[2:0]

BATSEL

ILIM[4:0]

VOC[14:0]

VCM[14:0]

VOCDELTA[14:0]

VOCTHD[15:0]

VOCTHD[15:0]

VOV[14:0]

VOVRING[14:0]

VOCTRACK[15:0]

Programmable

Range

See Table 12

Monitor only

VBATH/VBATL

18–45 mA

0 to 63.3 V

0 to 63.3 V

0 to 63.3 V

0 to 63.3 V

0 to 63.3 V

0 to 63.3 V

0 to 63.3 V

0 to 63.3 V

LSB Size

N/A

N/A

N/A

0.875 mV

4.907 mV

4.907 mV

4.907 mV

4.907 mV

4.907 mV

4.907 mV

4.907 mV

4.907 mV

Effective

Resolution

N/A

N/A

N/A

0.875 mA

1.005 V

1.005 V

1.005 V

1.005 V

1.005 V

1.005 V

1.005 V

1.005 V

The dc linefeed circuitry generates the necessary TIP/RING I/V characteristics along with loop closure and ring trip

detection. For loop start applications, VTIP–VRING is programmable. The loop current limit, ILIM, is software-

programmable with a range from 18–45 mA.

60

RO = 600 Ω

50

VOC

40

Loop Closure

Threshold

RO = 320 Ω

30

20

10

ILIM = 24 mA

ILIM

0

10 20 30 40 50

ILOOP (mA)

Figure 8. VTIP–RING vs. ILOOP Characteristic for Loop Start Operation

Preliminary Rev. 0.96

23

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