XE0055CS2(1997) Ver la hoja de datos (PDF) - Xecom

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XE0055CS2
(Rev.:1997)

Minature V.34 Telephone Line Interface

Xecom 

Pin Configuration

XE0055CS2

12

oo

Ring Tip

345678

9

oooooo

o

OH T1 Gnd Vcc T2 /RI

/CD

Pin Descriptions

Pin Name Description

1

Ring

Ring is one of two signals which form the telephone network connection (RJ11

Pin 4). This device is not sensitive to the polarity of the battery voltage on the

telephone line. Ring has 1500 volts isolation from the rest of the circuitry. This

isolation must be preserved throughout the system.

2

Tip

Tip provides the second connection to the telephone network (RJ11 Pin 3). Tip

has 1500 volts isolation from the rest of the circuitry. This isolation must be

preserved throughout the system.

3

OH

Hook-switch relay control. A high on OH closes the internal relay and connects

the equipment to the telephone line.

4

T1

T1 connects directly to the secondary side of the XE0055CS2 telephone line

transformer.

5

GND

This signal is used as common reference for all of the control signals in the

XE0055CS2. Signals on T1 and T2 are not referenced to ground.

6

VCC

VCC provides the power source for the hook-switch control. The XE0055CS2

will operate with VCC equal to either 3.3 or 5 volts

7

T2

T2 connects directly to the secondary side of the telephone line transformer of

the XE0055CS2

8

/RI

Ring Indicate, output, active low, TTL, RI provides a half-wave representation of

the Ring appearing on the telephone line. An external pulll-up resistor is

required to correctly bias the ring indicate output.

9

/CD

Connect Detect, output, active low, TTL. CDindicates that the XE0055CS2 is

connected to the telephone line in the on-hook state.

3/XECOM

XE0055CS2

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