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TEA7089AFP Datasheet(Fiches technique) 8 Page - STMicroelectronics

Numéro de pièce TEA7089AFP
Description  LOW-RANGE PHONE DEDICATED CHIP
Télécharger  17 Pages
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
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 8 page
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MICROCONTROLLER INTERFACE WITH TEA7089A
All inputs can be driven by a Low level max. of
0.1 x VRMC and a high level min. of 0.9 x VRMC.
Inputs MSK, DCL and DATA have internal pull-up
resistors of 120k
Ω and input OSC has a internal
pull up of 240k
Ω.
All outputs can drive a
±1mA typical.
Power Supply
The microcontroller is power supplied by a 3.4V
regulated supply (VRMC) and by an unregulated
power supply (VMC).
The two supplies are connected through a serial
regulator.The unregulatedpower supply (VMC) has
a DC voltageequal to: V12 - 0.6V and must be lower
than 6V. It is also possible to connect a battery at
Pin VMC and use the regulated output at Pin VRMC
to supply a LCD driver.
The current consumption on the serial regulator
has a typical value of 60
µA.
Power ON (PON)
The TEA7089Ageneratesa power on signal (PON)
as soon as the voltage on Pin VRMC is higher than
2.6V (0.75 x VRMC final) and the line current is pre-
sent.
Note : D u ri ng
th e
b r eak
per i od
i n
t he
loopdisconndect and Flash mode and
during the exchange line break, the power
ON signal goes to low level. Maximum delay
for Pon decay edge after ILine goes to zero
is 50ms (with C8 = 47
µF, C11 = 1µF,
C27 = 10
µF).
Reset
The TEA7089Agenerates a rise edge Reset signal
as soon as the logic power supply is higher than
2.6V (0.75 x VRMC final).
RESET remains high until VRMC decreases below
2.5V or the RESET control code is received. In
Ring, RESET is identical to RI output.
Only new positive edge PON, derived on opening
and closing the line, is forcing the default mode
again. The Reset control code is only active in
speech mode.
Serial Bus Interface (Data and Clock)
The serial bus uses 6 bits. Astandard 8 bit bus can
be used, bits a6 and a7 are not take in account by
the TEA7089A. Different types of codes are used :
a) The Ring Control Code :
- Ring start up
- Output level codes
b) The Operating Code :
- Speech
- Dialing
- Microphone mute
- Earphone/Microphone mute
c) The Data Codes (DTMF, ring frequencies) :
Those data codes are stored inside the
TEA7089Aand are used as soon as the dialing
code or the ring start code is received.
d) The Configuration Code :
- AGC / no AGC (toggle)
- No mask / mask (Low DC in ”make”) (toggle)
- Normal gain / normal gain +6dB, on receive
channel (toggle)
- 1.79MHz external clock / 3.58MHz internal
oscillator (toggle)
Those configuration cod es are ”Flip-Flop”
codes.
For instance : The first time that the+6dB code
is sent, the receive gain increases of +6dB.
If the same code is sent again, the receive gain
goes back to normal value. In the same way the
3.58MHz internal oscillator can be switched
OFF with a second transmission of the proper
code.
e) The RESET Code :
Reset code from the MCU will reset internallogic
of TEA7089A to default mode and will induce
TEA7089A to generate a ”RESET” status ”low”
to the MCU on Pin 19.
Warning : the ”RESET” code deactivates the
serial bus interface which is reactivated only
after a ”ON-HOOK/OFF-HOOK” sequence.
f) The INITIALIZATION Code :
Initialization code from the MCU will reset the
internal logic of TEA7089A to default mode, but
the TEA7089Awill not generatereset command
to the MCU on Pin 19.
TEA7089A
8/17




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