SI3015-F-FS View Datasheet(PDF) - Silicon Laboratories

Part Name

Description

Manufacturer

SI3015-F-FS

V.22BIS ISOMODEM® CHIPSET WITH ERROR CORRECTION

Silicon Laboratories 

Si2403

U67 ITC1

Bit D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4

Name

OFF OHS ACT

Type

R/W R/W R/W

Reset settings = 0x0008

D3 D2

DCT[1:0]

R/W

D1 D0

RZ RT

R/W R/W

Bit Name

Function

15:8 Reserved Read returns zero.

7

OFF DC Termination Off.

0 = Normal operation. The OFF bit must always be set to 0 when on-hook.

1 = DC termination disabled and the device presents an 800 Ω dc impedance to the line,

which is used to enhance operation with an off-hook parallel phone.

6

OHS On-Hook Speed.

0 = The Si2403 will execute a fast on-hook.

1 = The Si2403 will execute a slow controlled on-hook.

5

ACT AC Termination Select.

0 = Selects the real impedance.

1 = Selects the complex impedance.

4 Reserved Read returns zero.

3:2 DCT[1:0] DC Termination Select.

00 = Low-voltage mode (Transmit level = –13.85 dBm).

01 = Japan mode (Transmit level = –11.85 dBm).

10 = FCC mode. Standard voltage mode (Transmit level = –9.85 dBm).

11 = CTR21 mode. Current limiting mode (Transmit level = –9.85 dBm).

1

RZ Ringer Impedance.

0 = Maximum (high) ringer impedance.

1 = Synthesize ringer impedance. C15, R14, Z2, and Z3 must not be installed when setting

this bit. See the “Ringer Impedance” section in “AN70: Si2456/Si2433/Si2414/Si2403 Modem

Designer’s Guide”.

0

RT Ringer Threshold Select.

Used to satisfy country requirements on ring detection. Signals below the lower level do not

generate a ring detection; signals above the upper level are guaranteed to generate a ring

detection.

0 = 11 to 22 Vrms.

1 = 17 to 33 Vrms.

44

Rev. 1.2

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