CPC5622ATR datasheet(11/18 Pages) IXYS

11 / 18 page

INTEGRATED CIRCUITS DIVISION

CPC5622

R03

www.ixysic.com

will output one logic low pulse per cycle of the ringing

frequency. Also, because the RING2 is the output of a

full-wave detector it will output two logic low pulses

per cycle of the ringing frequency. Hence, the

nomenclature RING2 for twice the output pulses.

The set-up of the ringing detector comparator causes

the RING output pulses to remain low for most of one

half-cycle of the ringing signal and remains high for the

entire second half-cycle of the ringing signal. For the

RING2 output, the pulses remain low during most of

both halves of the ringing cycle and returns high for

only a short period near the zero-crossing of the

ringing signal. Both of the ringing outputs remain high

during the silent interval between ringing bursts.

Hysteresis is employed in the LITELINK ringing

detector circuit to improve noise immunity.

The ringing detection threshold depends on the values

of R3 (RSNPD), R6 & R44 (RSNP-), R7 & R45 (RSNP+),

C7 (CSNP-), and C8 (CSNP+). The value of these

components shown in the application circuits are

recommended for typical operation. The ringing

detection threshold can be changed according to the

following formula:

Where:

• R

SNPD = R3 in the application circuits shown in this

data sheet.

• RSNP

TOTAL = the total of R6, R7, R44, and R45 in

the application circuits shown in this data sheet.

• C

SNP = C7 = C8 in the application circuits shown in

this data sheet.

• And ƒ

RING is the frequency of the ringing signal.

IXYS Integrated Circuits Division Application Note

AN-117 Customize Caller ID Gain and Ring Detect Voltage

Threshold is a spreadsheet for trying different

component values in this circuit. Changing the ringing

detection threshold will also change the caller ID gain

and the timing of the polarity reversal detection pulse,

if used.

3.2.2 Polarity Reversal Detection in On-hook

State

The full-wave ringing detector in the CPC5622 makes

it possible to detect an on-hook tip and ring battery

polarity reversal using the RING2 output. When the

polarity of the battery voltage applied to tip and ring

reverses, a pulse on RING2 indicates the event. The

system logic must be able to discriminate a single

pulse of approximately 1 msec when using the

recommended external snoop circuit components

from a valid ringing signal.

3.2.3 On-hook Caller ID Signal Reception

On-hook Caller IDentity (CID) data burst signals are

coupled through the snoop components, buffered

through LITELINK and output at the RX+ and RX-

pins.

In North America, CID data signals are typically sent

between the first and second ringing signal while in

other countries the CID information may arrive prior to

any other signalling state.

In applications that transmit CID after the first ringing

burst such as in North American, follow these steps to

receive on-hook caller ID data via the LITELINK RX

outputs:

Detect the first full ringing signal burst on RING

or RING2.

Monitor and process the CID data from the RX

outputs.

For applications as in China and Brazil where CID may

arrive prior to ringing, follow these steps to receive

on-hook caller ID data via the LITELINK RX outputs:

Simultaneously monitor for CID data from the RX

outputs and for ringing on RING or RING2.

Process the appropriate signalling data.

Note: Taking LITELINK off-hook (via the OH pin)

disconnects the snoop path from the receive outputs

and disables the ringing detector outputs RING and

RING2.

CID gain from tip and ring to RX+ and RX- is

determined by:

VRINGPK

750mV

RSNPD

-----------------





RSNP

TOTAL

RSNPD



f

RINGCSNP



--------------------------------------

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