CPC7594MC IXYS, CPC7594MC Datasheet - Page 14

• Manufacturer Part Number: CPC7594MC
• Manufacturer: IXYS

Specifications of CPC7594MC

• Lead Free Status / RoHS Status: Supplier Unconfirmed

CPC7594
Break-before-make operation of the CPC7594 can be
achieved using two different techniques.
The first method uses manipulation of the IN
and IN
“Break-Before-Make Ringing to Talk Transition Logic
Sequence” on page 14.
1. At the end of the ringing state apply the all off
The alternate break-before-make technique is
available for all versions of the CPC7594. As shown in
“CPC7594xA and CPC7594xB Truth Table” on
page 11 and “CPC7594xC Truth Table” on page 11,
the bi-directional T
switches when pulled to a logic low. Although logically
disabled, an active ringing switch (SW4) will remain
closed until the next zero crossing current event.
14
Ringing
Ringing
Before-
before-
Break-
Make-
All-Off
State
break
State
Make
Talk
Talk
2.3.4 Break-Before-Make Operation
state (1,1). This releases the ringing return
switch (SW3) while the ringing switch (SW4)
remains on, waiting for the next zero current
event.
2.3.5 Alternate Break-Before-Make Operation
TEST
IN
IN
logic inputs as shown in
RINGING
RINGING
1
0
0
1
1
1
0
SD
IN
IN
interface disables all of the
TEST
TEST
0
0
0
0
1
1
0
LATCH
LATCH
2.3.3 Table 1: Make-Before-Break Ringing to Talk Transition Logic Sequence
2.3.4 Table 1: Break-Before-Make Ringing to Talk Transition Logic Sequence
0
0
T
T
Z
Z
SD
SD
RINGING
Hold this state for at least one-half of the
sourced from the ring node of the SLIC.
transition state current limited by the dc
break switch current limit value will be
crossing to turn off. Maximum time is
one-half of the ringing cycle. In this
ringing cycle. SW4 waiting for zero
SW4 waiting for next zero-current
Zero-cross current has occurred
www.clare.com
Zero current has occurred.
Break switches close.
current to turn off.
SW4 has opened
Timing
Timing
2. Hold the all off state for at least one-half of a
3. Apply inputs for the next desired state. For the
Break-before-make operation occurs when the ringing
switches open before the break switches SW1 and
SW2 close.
As shown in the table “Alternate Break-Before-Make
Ringing to Talk Transition Logic Sequence” on
page 15, this operation is similar to the one shown in
“Alternate Break-Before-Make Operation” on page 14,
except in the method used to select the all off state,
and in when the IN
reconfigured for the talk state.
-
-
ringing cycle to assure that a zero crossing event
occurs and that SW4, the ringing switch, has
opened.
talk state, the inputs would be (0,0).
Switches
Switches
RINGING
Break
Break
Off
On
On
Off
Off
Off
On
and IN
Ringing
Ringing
Return
Switch
Return
Switch
(SW3)
(SW3)
On
Off
Off
On
Off
Off
Off
TEST
Ringing
Ringing
Switch
Switch
(SW4)
(SW4)
On
On
Off
On
On
Off
Off
inputs are
Switches
Switches
Test
Test
R01.1
Off
Off
Off
Off
Off
Off
Off