SI3021 datasheet(37/54 Pages) ETC

37 / 54 page

Si3035

Rev. 1.2

Reset settings = 0000_0000

Bit

D7D6D5

D4D3D2

D1D0

Name

OPOL

ONHM

RDT

OHE

Type

R/W

Bit

Name

Function

7:5

Reserved

Read returns zero.

4OPOL

Off-Hook Polarity.

0 = Off-hook pin is active low.

1 = Off-hook pin is active high.

3ONHM

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.

1OHE

Off-Hook Pin Enable.

0 = Off-hook pin is ignored.

1 = Enables the operation of the off-hook pin.

0OH

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.

SI3021 Datasheet(PDF) 37 Page - List of Unclassifed Manufacturers

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