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LITELINK III Evaluation Board Users Guide

UG-CPC5622-EVAL-600R - Rev A

www.ixysic.com

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2.2 Using the Evaluation Board

Follow these guidelines for productive use of the LITELINK evaluation board:

Evaluation board circuit components are sensitive to 
electrostatic discharge (ESD). Use normal ESD 
precautions when working with the LITELINK III 
evaluation board.

Make all low voltage side connections (J2) to the 
board before applying power to VCC. 
Tip and Ring connections at J1 can be made at any 
time before or after VCC power is applied.

OH* should be open or tied to the VCC input power 
pin during power up and held for 50us after power 
up. 

Pulling OH* low will cause the CPC5622 to go 
off-hook and returning OH* high will cause the unit to 
go back on-hook. 

Analog transmission in both the transmit path and 
the receive path is enabled while off-hook. When 
on-hook, only the receive path is enabled. 

For proper off-hook operation, the Tip and Ring 
interface must be appropriately biased and 
terminated. 

The CPC5622 RING* and RING2* ringing detectors 
are only active while on-hook. 

The CPC5712U line voltage and polarity detectors 
are active in both the on-hook and off-hook states. 

3. Functional Description

The CPC5622-EVAL-600R provides the analog 
interface and signaling functions necessary to 
implement a PSTN two-wire terminating device for 
voice and data applications such as PBX FXO, 
cordless telephones, FAX machines, set top boxes, 
card readers, ATMs, and modems. Analog gains in 
both the transmit and receive paths for the 600R 
evaluation board are set to 0dB with the impedance of 
the two-wire interface configured for 600 ohms 
resistive. These analog functions are provided by the 
CPC5622A Phone Line Interface integrated circuit. 
Additionally, the CPC5622A provides the basic 
signaling functions of loop closure / loop open and 
ringing detect that are required for a two-wire, current 
sink, loop start interface. It is important to note that it is 
not within the scope of this document to provide 
complete behavioral descriptions of the CPC5622A or 
the CPC5712U functions as this information is 
covered in the data sheets and the appropriate 
application notes. 

Basic signaling functions for a loop start, current sink 
interface are loop closure (Off-Hook), loop open 
(On-Hook) and ringing detect. Loop closure / open is 
provided by the hook switch control function with 
ringing detect provided by the Snoop input circuit and 
the internal ringing detector. Additional loop voltage 
detectors used to determine the line status are 
provided by the CPC5712U Voltage Monitor with 
Detectors integrated circuit. Line condition status 
provided by the CPC5712U voltage detectors are: 
Line In Use (LIU), Loop battery presence (LOOP), and 
Polarity. While these detectors are not required for the 
most basic applications, they are required by the 
majority and are therefor provided on the evaluation 
board. Access to the analog paths and the detector 
functions is provided by the two connectors J1 and J2. 
Tip and Ring loop access is provided by J1 while J2 
provides access to the low voltage side (SELV) power 
and signals. 

Содержание CPC5622-EVAL-600R

Страница 1: ...tors indicating Loop Presence Line In Use and Loop Polarity CPC5622 EVAL 600R evaluation board top and bottom views are shown in the following illustrations Figure 1 Evaluation Board Top View Figure 2...

Страница 2: ...and consistency with the schematic the schematic names will be used from this point forward throughout the text Table 1 Telephone Network Access Connector J1 Pin Silk Screen Schematic Name Use 1 1 RI...

Страница 3: ...rd readers ATMs and modems Analog gains in both the transmit and receive paths for the 600R evaluation board are set to 0dB with the impedance of the two wire interface configured for 600 ohms resisti...

Страница 4: ...e TX differential inputs for the transmit path SELV to T R The maximum signal applied to these input pins is 0dBm This is 0 548Vp on each input For applications where the analog source is single ended...

Страница 5: ...ector output will remain stable at it s last state if battery feed from the network is lost 3 3 Tip to Ring Conditioning When using the CPC5622 evaluation board the tip to ring interface must be prope...

Страница 6: ...uple the common mode noise from the low voltage side into LITELINK s transmit path at the NTS node on pin 26 NTS is an inverting input of an amplifier whose output is located at node NTF on pin 26 Usi...

Страница 7: ...C5620A and CPC5621A devices This input is used to switch between the on hook receive transmission function used for CID reception and the ringing detector The CPC5622A has both these functions enabled...

Страница 8: ...U1 CPC5622A 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 VDD TXSM TX TX TX MODE GND OH RING RING2 RX RX SNP SNP RXF RX VDDL RXS PB BR ZDC DCS2 DCS1 NTF GAT NT...

Страница 9: ...G LIU VCC VCC OUT OUT R31 806K U2 CPC5712U 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 VCC DET_2 DET_1 POL OUT OUT IN IN VREF VDET1_LOW VDET1_HIGH VDET2_LOW VDET2_HIGH NOT_USED_A NOT_USED_B GND R29 10M 1 4...

Страница 10: ...15 C16 220pF 5 2000V 1808 11 1 C17 15pF 5 50V 0402 12 1 D1 S1ZB60 600V S1ZB60 13 1 F1 DNP 250V FUSE_461 14 1 J1 CON2_FXO SIP 2P 15 1 J2 CON12_FXO SIP 12P 16 1 Q1 CPC5603C 415V SOT223 17 1 Q2 395V 395V...

Страница 11: ...ease visit www ixysic com IXYS Integrated Circuits Division makes no representations or warranties with respect to the accuracy or completeness of the contents of this publication and reserves the rig...

Страница 12: ...Mouser Electronics Authorized Distributor Click to View Pricing Inventory Delivery Lifecycle Information IXYS CPC5622 EVAL EUR CPC5622 EVAL 600R...

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