參數(shù)資料
型號(hào)： TEA7092TQ
廠商： 意法半導(dǎo)體
英文描述： TELEPHONE ANALOG FRONT END
中文描述： 電話模擬前端
文件頁(yè)數(shù)： 39/57頁(yè)
文件大?。?/td> 574K
代理商： TEA7092TQ
IV - MICROCONTROLLER INTERFACE
IV.1 - Microcontroller Power Supply
The microcontroller is used in every modes,
speech, dialing and ring.
It is requested to start quickly in ring mode, less
than 200ms and to maintain the supply on the
microcontroller in pulse dialing mode, with a low
voltageacrossthe telephoneset,orduringanearth
loop connection,in thesetwomodes themicrocon-
troller is supplied through the energy previously
stocked ina capacitorand thiscapacitorshould be
able to maintain the power on the microcontroller
during one second.
This compromise between the different modes is
carriedoutthroughthe microcontrollerpowerman-
agementwhichisconnectedonPinV
MC
(Pin2)and
on Pin V
RMC
(Pin8).
Figure57 showsthe microcontrollerpower supply
management.
In OFF-HOOK mode :
- C10 on PinV
MC
(Pin2) is charged in priority with
theIstartup(I
LS
) currentsourceandis,afterReset
high, powered with I
VMC
(see Section II.1.3 -
STARTUP CHARACTERISTICS).
- The voltage on Pin V
MC
(Pin 2) is equal to :
V
L
(Pin 3) - 0.4V
- In Pulsedialingmodethemicrocontroller connected
on the 3.5Vregulatedvoltage,Pin V
RMC
(Pin8), is
poweredthroughtheserialregulator.
In Ring mode :
- For the microcontroller power supply only the
Figure57
capacitor C15 of 4.7
μ
F connected on
Pin V
RMC
(Pin 8) has to be charged, so the start-
up timein ring mode can be lessthan 200ms.
IV.2 - Reset and Pon Signals
These two piecesof informationgive the statusof
the PinV
RMC
(Pin8) and of the line current, I
L
.
In OFF-HOOK mode :
- PinRESET(Pin11)goesat highlevelwhenV
RMC
reaches2.6V and then remains at highlevel until
V
RMC
reaches the decay threshold fixed at 2.5V,
or the Reset code (0 0 1 0 1 1 1) is received
through the serial bus interface when PON is at
low level. If the Reset code has been previously
sent Pin RESET (Pin 11) goes back to an high
level,if V
RMC
is higher thanthe risethreshold,on
a rise edge of PONsignal.
Note :when PON is at high level,the Resetcode
is inhibited.
- Pin PON (Pin 12) goes at high level when the
voltageat Pin V
RMC
(Pin 8)reaches 2.6Vandthe
line current (I
L
) reachesthe value of 12mA, and
then remainsathighleveluntiltheline current(I
L
)
goes below the threshold level fixed through the
configuration code sent on the serial bus inter-
face.
Decay threshold level : I
L
= 12mA by default
configuration.
Decay threshold level : I
L
= 4mA if the code
(0 1 11 0 0 1) is sent.
I
VMC
Info for
PON & RESET
V
BANDGAP
470k
8
V
RMC
C15
4.7
μ
F
+
3
V
L
2
V
MC
+C10
470
μ
F
I
START
= I
LS
Close if
RESET Low and
I
L
Present
TEA7092
μ
F
+
LCD
3.5V
1
V
LS
Battery
A
TEA7092 - TELEPHONE SET INTEGRATEDCIRCUIT
39/57
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