TEA7092TQ 데이터 시트보기 (PDF) - STMicroelectronics

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TEA7092TQ

TELEPHONE ANALOG FRONT END

STMicroelectronics 

TEA7092

MICROCONTROLLER INTERFACE

Microcontroller Power Supply

The microcontroller power supply consists in a

serial regulator which generates a 3.5V regulated

supply on VRMC Pin, from an unregulated voltage

applied on VMC or VLS Pin.

The VMC Pin can be supplied either by the line, a

battery or any DC generator. The use of VMC input

allows to regulate the output VRMC voltage for an

LCD display. With no load, the quiescent current,

is 60µA. For an output current of 1.8mA, the typical

drop voltage between VMC and VRMC Pins is

150mV.

higher than the rise threshold, only on a rise edge

of PON signal. If this PON rise edge does not

appear, the RESET Pin remains at low logic level

even if VRMC goes upper 2.6V.

When PON output is at level ”1”, the Reset code is

inhibited.

PON : This output goes high when VRMC reaches

the 2.6V threshold level and the line current value

is upper than 12mA. As soon as the Reset output

is at level ”1”, the 4mA line current threshold detec-

tor can be sent through the serial bus interface

(0111001) to check if the line current value is be-

tween 4 and 12mA.

Microcontroller Control Signals

RESET : This output is setting to “1” when VRMC

reaches the 2.6V threshold level. This output goes

back to ”0” :

- If VRMC goes below 2.5V or

- If the Reset code (0010111) is sent on the serial

bus interface and if PON output is at level ”0”.

When the Reset code has been previously sent,

Pin RESET goes back to an high level, if VRMC is

RI/VI :

- In Ring mode : This output goes to level ”1” if :

• Pin RSU > 19V

• Pin VRMC > 2.6V

- In Off-Hook mode : This output manages the line

current variation indicator for transfer function

and this information is used by the microcontroller

to manage the transfer from one telephone set to

an other one connected in parallel on the same

line.

Figure 6 : Microprocessor Power Supply Block Diagram

VL 3

3mA

ILS

VLS

1

+

> 1MΩ

C1

Ring Information

IL > 12mA (0111000) or

IL > 4mA (0111001)

2.5V

11 RESET

12 PON

S witch Clos e d if :

VRMC > 2.5V or

VRSU > 2 0V

2

VMC

+

C2

1 3 5 kΩ

1.2V

9 0 kΩ

VRMC

8

+

C8

11/24

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