Specifications

Si2404
Rev. 0.91 45
Reset settings = 0x0003
Reset settings = 0x00E0
U63 DAAC3
BitD15D14D13D12D11D10D9D8D7D6D5D4D3D2D1D0
Name
LCS[7:0] ACT[3:0]
Type R/W
Bit Name Function
15:8 LCS[7:0]
Off-Hook Loop Current (1.1 mA/bit).
7:4 ACT[3:0] AC Termination Select.
ACT[3:0] AC Termination
0000 Real 600 Ω
0011 220 Ω + (820 Ω || 120 nF) and 220 Ω + (820 Ω || 115 nF)
0100 370 Ω + (620 Ω || 310 nF)
1111 Global complex impedance
3:0 Reserved Read returns 0x3.
U65 DAAC4
BitD15D14D13D12D11D10D9D8D7D6D5D4D3D2D1D0
Name PWMG PDN PDL
Type R/W R/W R/W
Bit Name Function
15 Reserved Read returns zero.
14 PWMG PWM Gain.
0=No gain.
1 = 6 dB gain applied to AOUT.
13 PDN Powerdown.
Completely powerdown the Si2404 and Si3010. Once set to 1, the Si2404 must be reset to
power on.
0 = Normal.
1 = Powerdown.
12:8 Reserved Read returns zero.
7:5 Reserved Must not change in a read-modify-write.
4PDL*Powerdown Line-Side Chip.
0 = Normal operation.
1 = Places the Si3010 in powerdown mode.
3:0 Reserved Must not change in a read-modify-write.
*Note: Typically used only for board-level debug.