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AN-155 データシート(PDF) 2 Page - IXYS Corporation

部品番号 AN-155
部品情報  Understanding LITELINK?
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メーカー  IXYS [IXYS Corporation]
ホームページ  http://www.ixys.com
Logo IXYS - IXYS Corporation

AN-155 データシート(HTML) 2 Page - IXYS Corporation

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AN-155-R02
www.ixysic.com
2
Application Note: AN-155
1. Introduction
This application note further explains the display fea-
ture (often called caller-ID or CID) signal routing func-
tions of the LITELINK Phone Line Interface (DAA).
2. CID Input Operation
CID is an active-low input to LITELINK that changes
internal signal routing on the chip. The CID input has
an internal pull-up resistor that keeps the input de-
asserted when not in use.
With CID asserted, the RING output of LITELINK is
disabled. Signals, including ringing signals, on the
snoop path are coupled to the RX+/RX- outputs.
These signals are affected by the high-pass effect of
the snoop capacitors.
With CID deasserted and OH asserted, signals on
the line are coupled to the RX+/RX- outputs through
the optical link on the LITELINK. Signals on the snoop
path are not coupled to the RX+/RX- outputs when
CID is deasserted.
3. Applications of CID
3.1 Display Feature Burst Prior to
Ringing
For applications where the display feature signal burst
precedes the first ringing burst, many designers
choose the following operating procedure:
1. Assert CID at all times when the LITELINK is on-
hook.
2. Detect ringing via an external optocoupler or
through the snoop path.
3. After reception of the display feature signal burst
and verification of ringing, deassert CID.
3.2 Display Feature Burst Between
First and Second Ring
For applications where the display feature signal burst
occurs between the first and second ringing bursts,
many designers choose to deassert CID until a ring
signal can be verified on the RING output using an
operating sequence such as:
1. Deassert CID in on-hook quiescent state.
2. On verification of ringing on RING, assert CID.
3. After the display feature burst time, deassert
CID.
4. For More Information
Clare Application Note AN-140,
Understanding
LITELINK II includes a truth table for LITELINK signal
routing inputs in section 4.1.
5. LITELINK Design Resources
5.1 Clare, Inc. Design Resources
LITELINK datasheets and reference designs
Application note AN-114
ITC117P
Application note AN-117
Customize Caller-ID Gain and
Ring Detect Voltage Threshold for CPC5610/11
Application note AN-140,
Understanding LITELINK II
Application note AN-146,
Guidelines for Effective
LITELINK Designs
Application note AN-149,
Increased LITELINK II Transmit
Power
Application note AN-150,
Ground-start Supervision Cir-
cuit Using IAA110.
Application Note AN-152,
LITELINK II to LITELINK III
Design Conversion


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