TEA7091 Datasheet, PDF (2/7 Pages) STMicroelectronics – TELEPHONE ANALOG FRONT END

TEA7091
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
PINS CONNECTION (Top views)
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.
VLS
VMC
VL
VREFL
LSIN
LSSOF
DTMF
VRMC
OSC
RI/VI
RESET
6 5 4 3 2 1 44 43 42 41 40
44 43 42 41 40 39 38 37 36 35 34
7
39
ILL
VLS
1
33
ILL
8
38
GNDA
VMC
2
32
GNDA
9
37
SLP
VL
3
31
SLP
10
36
VS
VREFL
4
30
VS
11
35
IREF
LSIN
5
29
IREF
12
PLCC44
34
SOFTL
LSSOF
6
PQFP44
28
SOFTL
13
33
TSOFT
DTMF
7
27
TSOFT
14
32
VCC
VRMC
8
26
VCC
15
31
VREF
OSC.
9
25
VREF
16
30
MIC2
RI/VI
10
24
MIC2
17
29
MIC1
RESET
11
23
MIC1
18 19 20 21 22 23 24 25 26 27 28
12 13 14 15 16 17 18 19 20 21 22
D93TL010
D93TL011
ABSOLUTE MAXIMUM RATINGS
Symbol
Top
Tstg
VLM
ILM
VREGM
Tj
Parameter
Operating Temperature
Storage Temperature
Supply Voltage (pin 3)
Supply Current
CMOS part supply (Pin 8)
Junction Temperature
Value
Unit
– 25 to +70
°C
– 55 to +150
°C
12
V
150
mA
6
V
– 25 to +150
°C
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