SI3015-F-FS View Datasheet(PDF) - Silicon Laboratories
Part Name
Description
Manufacturer
SI3015-F-FS Datasheet PDF : 68 Pages
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Si2403
U69 ITC3
Bit D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
Name
DIAL FJM VOL FLVM MODE
Type
R/W R/W R/W R/W R/W
Reset settings = 0x0006
Bit Name
Function
15:8 Reserved Read returns zero.
7 Reserved Do not modify. Must be set to zero.
6
DIAL DTMF Dialing Mode.
This bit should be set during DTMF dialing in CTR21 mode if LVCS < 12.
0 = Normal operation.
1 = Increase headroom for DTMF dialing.
5
FJM Force Japan DC Termination Mode.
0 = Normal Gain.
1 = When DCT = 2 (FCC mode), setting this bit forces Japan dc termination mode while allow-
ing for a transmit level of –1 dBm. See the “DTMF Dialing” section in “AN70: Si2456/Si2433/
Si2414/Si2403 Modem Designer’s Guide”.
4
VOL Line Voltage Adjust.
When set, this bit adjusts the TIP-RING line voltage. Lowering this voltage improves margin in
low-voltage countries. Raising this voltage may improve large-signal distortion performance.
0 = Normal operation.
1 = Lower DCT voltage.
3
FLVM Force Low Voltage Mode.
When DCT (U67, bits 3:2) = 10 (FCC mode), setting FLVM forces the low-voltage mode (see
DCT = 00) while allowing for a transmit level of –1 dBm.
0 = Disable.
1 = Enable.
2 MODE Mode.
This bit enables on-hook line monitoring. It is automatically set while on-hook and cleared
while off-hook.
1:0 Reserved Do not modify.
46
Rev. 1.2
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