tea1069n NXP Semiconductors, tea1069n Datasheet - Page 14

• Manufacturer Part Number: tea1069n
• Description: Versatile Speech/dialler/ringer With Music-on-hold
• Manufacturer: NXP Semiconductors

Philips Semiconductors
Dialler and ringer part
S
The power supply must be maintained for data storage.
The RAM retention voltage (standby supply voltage) may
drop down to 1.0 V. Applying a large capacitor across the
supply terminals can retain the memory if power
connections are broken. The minimum operation voltage is
2.5 V. The internal power-on reset is enabled for a voltage
below this minimum operation voltage.
O
Time base for the TEA1069 and TEA1069A is a
crystal-controlled on-chip oscillator which is completed by
connecting a 3.579545 MHz crystal or ceramic resonator
between XTAL1 and XTAL2. The oscillator starts when
V
CE/FDI = HIGH. The following types of ceramic
resonators are recommended:
R
Pin RESET is an input to the internal reset circuit. When
RESET = HIGH, it can be used to initialize the TEA1069
and TEA1069A which is normally done by the CE/FDI
input. The on-chip power-on reset generates a reset pulse
if V
1998 Jan 08
handbook, full pagewidth
UPPLY VOLTAGE
DD
ESET INPUT
SCILLATOR INPUT
Kyocera PBRC3.58ARPC10 (wired)
Kyocera KBR3.58MSATRPC10 (SMD)
Murata CSA3.58MG310VA (wired).
Versatile speech/dialler/ringer with
music-on-hold
DD
reaches the operation voltage level and
drops below 2.5 V. In this event a proper start-up
:
PIN
Fig.11 Equivalent circuit of an anti-sidetone network in a Wheatstone bridge configuration.
:
RESET
PINS
/
OUTPUT
V
DD
:
PINS
AND
V
XTAL1
EE
Z line
AND
V EE
XTAL2
R1
R9
SLPE
LN
14
occurs after the supply voltage rises above the minimum
operation voltage level again.
During and directly after reset pins 14 to 19, 21, 29 to 32,
34 and 35 are set HIGH; pins 8, 20, 22, 26 to 28 and 33
are set to LOW.
The RESET pin can be connected to V
resistor of 100 k to 1 M , which will save leakage
current. A capacitor connected to V
extend the reset time, in case a longer reset is desirable.
To prevent the dialler from reacting on voltage
disturbances on the telephone line a time-out is active.
The dialler returns to standby state if the voltage on the line
has disappeared for more than this reset-delay time (t
C
PIN
This active HIGH input is used to initialize part of the
system, to select the on-line, standby, or ringer mode and
to detect line power breaks. To keep the TEA1069 and
TEA1069A in the on-line mode, CE/FDI has to be HIGH.
In the exchange, several AC signals can be superimposed
on the DC signal, e.g. dialling tone, busy tone,
disturbances (like line power breaks), and the ringer
signal. The ringer signal is evaluated, and checked if its
frequency is within the limits of the frequency interval as
set by the diode option RFS. It is assumed that the ringer
frequency at pin CE/FDI is the double of the frequency
present on the telephone line.
i m
HIP
CE/FDI
R8
Z bal
E
NABLE
R A
/F
IR
REQUENCY
MSA501 - 1
R t
TEA1069; TEA1069A
D
ISCRIMINATOR
DD
Product specification
EE
can be used to
, preferably via a
I
NPUT
:
rd
).