SI2456 datasheet(52/86 Pages) SILABS

Part #	SI2456

Description	V.90, V.34, V.32BIS ISOMODEM??WITH INTEGRATED GLOBAL DAA

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Manufacturer	SILABS [Silicon Laboratories]

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52 / 86 page

Si2456/Si2433/Si2414

52

Rev. 0.9

Reset settings = 0x0008

U67 ITC1

Bit

D15 D14 D13 D12 D11 D10

D9

D8

D7D6D5D4D3

D2

D1

D0

Name

OFF OHS ACT

DCT

RZ

RT

Type

R/W R/W R/W

R/W

R/W R/W

Bit

Name

Function

15:8

Reserved Read returns zero.

7OFF

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.

6OHS1,2

On-Hook Speed.

0 = The Si2456/33/14 will execute a fast on-hook.

1 = The Si2456/33/14 will execute a slow controlled on-hook.

5ACT1,2

AC Termination Select.

0 = Selects the real impedance.

1 = Selects the complex impedance.

4

Reserved Read returns zero.

3:2

DCT1,2

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).

1RZ1,2

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 "Ringer Impedance" on page 69.

0RT1,2

Ringer Threshold Select.

Used to satisfy country requirements on ring detection. Signals below the lower level does 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.

Notes:

1. See Table 19 on page 39

2. See "Appendix A—DAA Operation" on page 67

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