Si3035
Register 5. DAA Control 1
Bit
D7
D6
D5
D4
OPOL ONHM RDT
R/W R/W
D3
D2
D1
D0
OH
Name
Type
OHE
R/W
R
R/W
Reset settings = 0000_0000
Bit
7:5
4
Name
Reserved Read returns zero.
Function
OPOL
Off-Hook Polarity.
0 = Off-hook pin is active low.
1 = Off-hook pin is active high.
3
2
ONHM
On-Hook Line Monitor.
0 = Normal on-hook mode.
1 = Enables low-power monitoring mode allowing the DSP to receive line activity without
going off-hook. This mode is used for caller ID detection.
RDT
Ring Detect.
0 = No ring is occurring. Reset either 4.5–9 seconds after last positive ring is detected or
when the system executes an off-hook.
1 = Indicates a ring is occurring.
1
0
OHE
OH
Off-Hook Pin Enable.
0 = Off-hook pin is ignored.
1 = Enables the operation of the off-hook pin.
Off-Hook.
0 = Line side chip is on-hook.
1 = Causes the line side chip to go off-hook. This bit operates independently of OHE and is a
logic OR with the off-hook pin when OHE = 1.
Rev. 1.2
37
ETC [ ETC ]
