CPC7583BA datasheet(15/19 Pages) IXYS

15 / 19 page

INTEGRATED CIRCUITS DIVISION

CPC7583

R07

www.ixysic.com

Break-before-make operation can also be achieved

using the TSD pin as an input. In “Break-Before-Make

Operation (Ringing to Talk Transition)” on page 15, lines 2

and 3, it is possible to induce the switches to the all-off

state by grounding TSD instead of applying input to the

logic pins. This has the effect of overriding the logic

inputs and forcing the device to the all-off state. For

20 Hz ringing hold this input state for 25 ms. During

this hold period, toggle the inputs from the ringing

state to the talk state. After the 25 ms, release TSD to

return switch control to the input pins INTESTout,

INRINGING, INTESTin and the latch control pin.

2.2.1 Make-Before-Break Operation (Ringing to Talk Transition)

2.2.2 Break-Before-Make Operation (Ringing to Talk Transition)

2.3 Alternate Break-Before-Make Operation

Note that break-before-make operation can also be

achieved using TSD as an input. In lines 2 and 3 of the

table “Break-Before-Make Operation (Ringing to Talk

Transition)” on page 15, instead of using the logic input

pins to force the all-off state, force TSD to ground. This

overrides the logic inputs and also forces the all off

state. Hold this state for one-half of the ringing cycle.

During this TSD forced all-off state, change the inputs

from the power ringing state (INRING = 1, INTESTIN = 0,

INTESTOUT = 0) to the talk state (INRING = 0,

INTESTIN = 0, INTESTOUT = 0). After the hold period,

release TSD to return switch control to the input pins

which will set the talk state.

State

INRINGING INTESTIN INTESTOUT Latch

TSD

Timing

Break

Switches

1 and 2

Ring

Return

Switch 3

Ring

Access

Switch 4

All Other

Test

Switches

Ringing

Floating

Off

Make-

before-

break

Floating

SW4 waiting for next

zero-current crossing to turn

off. Maximum time is one-half

of ringing. In this transition

state, current that is limited to

the dc break switch current

limit value will be sourced

from the ring node of the

SLIC.

Off

Talk

Floating

Zero-cross current has

occurred

Off

State

INRINGING INTESTIN INTESTOUT Latch

TSD

Timing

Break

Switches

1 and 2

Ring

Return

Switch 3

Ring

Access

Switch 4

All Other

Test

Switches

Ringing

Floating

Off

All off

Floating

Hold this state for one-half of

ringing cycle. SW4 waiting for

zero current to turn off.

Off

All off

Floating

Zero current has occurred.

SW4 has opened

Off

Talk

Floating

Close break switches

Off

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