SLIC Products

11

Note:

E0 High enables DET.

Table 1.

SLIC Decoding

DET Output

State

C3 C2 C1

2-Wire Status

E1 = 1

E1 = 0

0

0

0

0

Open Circuit

Ring trip

Ring trip

1

0

0

1

Ringing

Ring trip

Ring trip

2

0

1

0

Active

Loop detector

Ground key

3

0

1

1

On-Hook TX (OHT)

Loop detector

Ground key

4

1

0

0

Tip Open

Loop detector

Ground key

5

1

0

1

Standby

Loop detector

Ground key

6

110

Reserved

7

111

Reserved

Table 2.

User-Programmable Components

pole and any external stray capacitance between VTX and

RSN must be taken into account.

desired loop current in the constant-current region.

OHT loop current (constant-current region).

cutoff frequency.

Thermal Management Equations (Normal Active and Tip Open States)

dissipation within the SLIC in Normal Active and Tip Open

states only.

Tip Open states.

Power dissipated in the SLIC while in Active and Tip Open

states.

Z

T

200 Z

2W IN

2R

F

–

()

=

Z

RX

Z

L

G

42L

-----------

200

Z

T

•

Z

T

200 Z

L

2R

F

•

+

()

+

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

•

=

R

DC 1

R

DC2

500

I

LOOP

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

=

+

C

DC

1.5 ms

R

DC1

R

DC2

+

R

DC1

R

DC2

•

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

•

=

R

D

375

I

T

---------

C

D

0.5 ms

R

D

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

=

,

=

I

OHT

500 V

0.66

•

R

DC 1

R

DC2

+

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

=

C

CAS

1

3.4

10

c

•

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

=

R

TMG

V

BAT

6V

–

I

LOOP

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

≥

P

RTM G

V

BAT

6 V

–

I

L

R

L

•

()

2

–

R

TMG

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

=

P

SLIC

V

BAT

I

L

P

RTMG

R

()

2

–

()

–

•

0.12 W

+

=