SI3211 ETC, SI3211 Datasheet - Page 85

• Manufacturer Part Number: SI3211
• Description: PROSLIC PROGRAMMABLE CMOS SLIC/CODEC WITH RINGING/BATTERY VOLTAGE GENERATION
• Manufacturer: ETC

Register 65. External Bipolar Transistor Control
Reset settings = 0110_0001
Name
Type
Bit
3:2
1:0
Bit
7
6
5
4
ETBO[1:0]
ETBA[1:0]
Reserved
Name
ETBE
D7
SQH
CBY
SQH
R/W
D6
Read returns zero.
Audio Squelch.
0 = No squelch.
1 = STIPAC and SRINGAC pins squelched.
Capacitor Bypass.
0 = Capacitors CP (C1) and CM (C2) in circuit.
1 = Capacitors CP (C1) and CM (C2) bypassed.
External Transistor Bias Enable.
0 = Bias disabled.
1 = Bias enabled.
External Transistor Bias Levels—On-Hook Transmission State.
DC bias current which flows through external BJTs in the on-hook transmission state.
Increasing this value increases the compliance of the ac longitudinal balance circuit.
00 = 4 mA
01 = 8 mA
10 = 12 mA
11 = Reserved
External Transistor Bias Levels—Active Off-Hook State.
DC bias current which flows through external BJTs in the active off-hook state. Increasing
this value increases the compliance of the ac longitudinal balance circuit.
00 = 4 mA
01 = 8 mA
10 = 12 mA
11 = Reserved
CBY
R/W
D5
ETBE
Preliminary Rev. 1.11
R/W
D4
D3
ETBO[1:0]
Function
R/W
Si3210/Si3211/Si3212
D2
D1
ETBA[1:0]
R/W
D0
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