L9219G データシートの表示（PDF） - Agere -> LSI Corporation

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L9219G

Low-Cost Line Interface with Reverse Battery and Dual Current Limit

Agere -> LSI Corporation 

Data Sheet

November 2001

L9219A/G Low-Cost Line Interface

with Reverse Battery and Dual Current Limit

Pin Information (continued)

Table 1. Pin Descriptions (continued)

PLCC

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

Symbol

LCTH

DCOUT

VBAT

PR

CF2

CF1

B2

B1

B0

AGND

BGND

PT

RTSN

RTSP

NC

NSTAT

VITR

TXI

VTX

TG

TSD

NC

Type

Description

I Loop Closure Threshold Input. Connect a resistor to DCOUT to set off-hook

threshold.

O dc Output Voltage. This output is a voltage that is directly proportional to the abso-

lute value of the differential tip/ring current.

— Battery Supply. Negative high-voltage power supply.

I/O Protected Ring. The output of the ring driver amplifier and input to loop sensing cir-

cuitry. Connect to the loop through overvoltage protection.

— Filter Capacitor 2. Connect a 0.1 µF capacitor from this pin to AGND.

— Filter Capacitor 1. Connect a 0.47 µF capacitor from this pin to pin CF2.

I State Control Input. B0, B1, and B2 determine the state of the SLIC. See Table 2.

Pin B2 has internal pull-down.

I State Control Input. B0, B1, and B2 determine the state of the SLIC. See Table 2.

Pin B1 has internal pull-down.

I State Control Input. B0, B1, and B2 determine the state of the SLIC. See Table 2.

Pin B0 has internal pull-down.

— Analog Signal Ground.

— Battery Ground. Ground return for the battery supply.

I/O Protected Tip. The output of the tip driver amplifier and input to loop sensing cir-

cuitry. Connect to loop through overvoltage protection.

I Ring Trip Sense Negative. Connect this pin to the ringing generator signal through a

high-value resistor.

I Ring Trip Sense Positive. Connect this pin to the ring relay and the ringer series

resistor through a high-value resistor.

— No Connect.

O Ring Trip Detector Output/Loop Detector Output. When low, this logic output indi-

cates that ringing is tripped or that an off-hook condition exists.

O ac Output Voltage. The voltage at this point is directly proportional to the differential

tip/ring current.

I ac/dc Separation. Connect a 0.1 µF capacitor from this point to VTX.

O ac and dc Output Voltage. This output is a voltage that is directly proportional to the

differential tip/ring current.

— Transmit Gain. Connect an 8.06 kΩ from TG to VTX to set the transmit gain of the

SLIC.

O Thermal Shutdown. When high, this logic output indicates the device is in thermal

shutdown.

— No Connect.

Agere Systems Inc.

5

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