SI3056-D-FSR Silicon Laboratories Inc, SI3056-D-FSR Datasheet - Page 69

• Manufacturer Part Number: SI3056-D-FSR
• Description: Modem Chip Chipset 56Kbps 16-Pin SOIC T/R
• Manufacturer: Silicon Laboratories Inc

Specifications of SI3056-D-FSR

• Package: 16SOIC
• Main Category: Chipset
• Maximum Data Rate: 56 Kbps
• Typical Operating Supply Voltage: 3.3 V
• Power Supply Type: Analog
• Typical Supply Current: 15 mA
• Minimum Operating Supply Voltage: 3 V
• Maximum Operating Supply Voltage: 3.6 V
• Lead Free Status / RoHS Status: Compliant

Register 26. DC Termination Control
Reset settings = 0000_0000
Bit
7:6
5:4
3:2
Name
Type
1
0
Bit
Reserved Do not write to these register bits.
DCV[1:0]
MINI[1:0]
Name
DCR
ILIM
D7
DCV[1:0]
R/W
TIP/RING Voltage Adjust.
Adjust the voltage on the DCT pin of the line-side device, which affects the TIP/RING voltage
on the line. Low voltage countries should use a lower TIP/RING voltage. Raising the TIP/
RING voltage improves signal headroom.
Minimum Operational Loop Current.
Adjusts the minimum loop current so the DAA can operate. Increasing the minimum opera-
tional loop current improves signal headroom at a lower TIP/RING voltage.
Current Limiting Enable.
0 = Current limiting mode disabled.
1 = Current limiting mode enabled. Limits loop current to a maximum of 60 mA per the TBR21
standard.
DC Impedance Selection.
0 = 50 Ω dc termination is selected. Use this mode for all standard applications.
1 = 800 Ω dc termination is selected.
DCV[1:0]
MINI[1:0]
D6
00
01
10
11
00
01
10
11
D5
DCT Pin Voltage
Min Loop Current
MINI[1:0]
R/W
3.1 V
3.2 V
3.35 V
3.5 V
10 mA
12 mA
14 mA
16 mA
D4
D3
Rev. 1.05
D2
Function
ILIM
R/W
D1
DCR
R/W
D0
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