TEA7092 ST Microelectronics, Inc., TEA7092 Datasheet - Page 11

• Manufacturer Part Number: TEA7092
• Description: Telephone Analog Front End
• Manufacturer: ST Microelectronics, Inc.

MICROCONTROLLER INTERFACE
Microcontroller Power Supply
The microcontroller power supply consists in a
serial regulator which generates a 3.5V regulated
supply on V
applied on V
The V
battery or any DC generator. The use of V
allows to regulate the output V
LCD display. With no load, the quiescent current,
is 60 A. For an output current of 1.8mA, the typical
drop voltage between V
150mV.
Microcontroller Control Signals
RESET : This output is setting to “1” when V
reaches the 2.6V threshold level. This output goes
back to "0" :
- If V
- If the Reset code (0010111) is sent on the serial
Figure 6 : Microprocessor Power Supply Block Diagram
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 V
RMC
MC
goes below 2.5V or
Pin can be supplied either by the line, a
RMC
MC
or V
Pin, from an unregulated voltage
LS
Pin.
MC
and V
RMC
voltage for an
RMC
MC
Pins is
RMC
input
RMC
is
When PON output is at level "1", the Reset code is
inhibited.
PON : This output goes high when V
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.
RI/VI :
- In Ring mode : This output goes to level "1" if :
- In Off-Hook mode : This output manages the line
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 V
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.
Pin RSU > 19V
Pin V
RMC
RMC
> 2.6V
goes upper 2.6V.
RMC
TEA7092
reaches
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