DESCRIPTION

The TEA7091 is a Telephone set Analog Front

End (TAFE) interface intended for use in conjunc-

tion with a microcontroller.

In this configuration the TEA7091 provides a

worldwide mid-range telephone set with loudhear-

ing on board and melody ringer on loudspeaker.

Repertory dialer (memory on MCU) and various

features (HOLD, Tone/Pulse, Flash, MUTE, ad-

justable Ringer and Loudhearing levels..) are pro-

grammable by MCU.

Also high-range telephone set can be built around

TEA7091

by

adding

Handsfree

controller

(TEA7540), Electronic Hook Switch and upgraded

MCU (ST family) with LCD driver.

The concept using TAFE + Microcontroller is

called BICHIP approach.

The benefits of this concept are:

– Saving of external components.

– Easy upgrade of the features (extra memories,

LCD driver, Answering machine or Cordless in-

terface..) through microcontroller.

– Replacement of configuration switches (PABX

/Public, Tone/Pulse...) by EEPROM settings.

This also induces reliability and cost improve-

ment.

ABSOLUTE MAXIMUM RATINGS

Symbol

Parameter

Value

Unit

Operating Temperature

– 25 to +70

°C

Storage Temperature

– 55 to +150

°C

Supply Voltage (pin 3)

12

V

Supply Current

150

mA

CMOS part supply (Pin 8)

6

V

Junction Temperature

– 25 to +150

°C

PINS CONNECTION (Top views)

1

2

3

5

64

7

8

9

10

12

11

13

14

15

16

17

39

38

37

36

34

35

33

32

31

30

29

40

41

42

44

43

23

22

21

19

18

20

28

27

26

24

25

VLS

VMC

VL

VREFL

LSSOF

LSIN

DTMF

VRMC

OSC

RI/VI

RESET

ILL

GNDA

SLP

VS

SOFTL

IREF

TSOFT

VCC

VREF

MIC2

MIC1

D93TL010

1

2

3

5

6

4

7

8

9

10

17

11

18

19

20

21

22

44

43

42

41

39

40

38

37

36

35

34

28

27

26

24

23

25

33

32

31

29

30

LSSOF

DTMF

VRMC

RI/VI

RESET

OSC.

VLS

VMC

VL

LSIN

VREFL

SOFTL

TSOFT

VCC

MIC2

MIC1

VREF

ILL

GNDA

SLP

IREF

VS

D93TL011

12

13

14

15

16

PLCC44

PQFP44

TEA7091

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