SI2414 SILABS [Silicon Laboratories], SI2414 Datasheet - Page 52

• Manufacturer Part Number: SI2414
• Manufacturer: SILABS [Silicon Laboratories]

Si2456/Si2433/Si2414
U67 ITC1
Reset settings = 0x0008
52
Notes:
15:8
Name
Type
Bit
3:2
Bit
7
6
5
4
1
0
1. See Table 19 on page 39
2. See "Appendix A—DAA Operation" on page 67
Reserved Read returns zero.
Reserved Read returns zero.
OHS
DCT
D15 D14 D13 D12 D11
ACT
Name
RZ
RT
OFF
1,2
1,2
1,2
1,2
1,2
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.
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.
AC Termination Select.
0 = Selects the real impedance.
1 = Selects the complex impedance.
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).
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.
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 V
RMS
.
D10
D9
Rev. 0.9
D8
OFF OHS ACT
R/W
D7
Function
R/W
D6
R/W
D5
D4
D3
DCT
R/W
D2
R/W
D1
RZ
R/W
D0
RT