uba2051t NXP Semiconductors, uba2051t Datasheet - Page 19

• Manufacturer Part Number: uba2051t
• Description: Uba2050 A ; Uba2051 A;c One-chip Telephone Ics With Speech, Dialler And Ringer Functions
• Manufacturer: NXP Semiconductors

Philips Semiconductors
Table 3 Ringer melodies
P
The pulse dialling system uses line current interruptions to
signal the digits dialled to the exchange. The number of
line current interruptions corresponds to the digit dialled
except for the digit [0] which is characterized by
10 interruptions. After each digit there is an inter-digit
pause time (t
When dialling, the transmission part is muted.
The
ratio, repetition rate (pulse dialling), the flash time and the
access pause time depend on the resistor options: MMS,
PTS, MBS, PPS, FTSA, FTSB and APT (see Fig.25 and
Table 7).
Valid keys are the digits [0] to [9], [R], [LNR/P], [P
and [ /T] (when MMS resistor option is off).
To allow start-up from C
implemented between pin DP/FL and pin V
Pin DP/FL is an open-drain output and is set HIGH (via an
external pull-up resistor) when V
2000 May 19
handbook, full pagewidth
Bell 1 (default)
Bell 2
Bell 3
Bell 4
ULSE DIALLER
One-chip telephone ICs with speech,
dialler and ringer functions
/T] key definition, the dialling mode, the make/break
idp
MDY/TONE
(
).
PINS
CE/FDI
NAME
DP/FL, DMO
VDD
sync
time
discharged, no ESD diode is
DD
sample
time
AND
< V
LED)
POR
770 + 943 + 1341
852 + 943 + 1206
943 + 1206 + 1341
1206 + 1341 + 1482
Fig.19 Ringer frequency detection.
.
DD
.
FREQUENCIES (Hz)
T]
19
Pin DMO of the UBA205x is used to enable external
hardware (see Fig.37) which decreases the DC voltage
over the A and B network exchange terminals during pulse
dialling. Several countries require this feature. Pin DMO is
a push-pull output and is LOW when V
Figure 20 shows the timing diagram in pulse dialling mode
for the UBA205x when keys [3], [3], [LNR/P] and [4] are
pressed.
Figure 20 is also valid for the UBA2051C, with the
exception of the DMO signal.
In pulse dialling mode, pin LED of the UBA205xA is set
LOW after off-hook and becomes HIGH when the first
DTMF code is sent after switching over to DTMF dialling.
Pin LED is a push-pull output and is LOW when
V
Figure 21 shows the timing diagram in pulse dialling mode
for the UBA205xA when keys [3], [3], [P
pressed.
DD
< V
POR
UBA2050(A); UBA2051(A;C)
.
28 + 28 + 28
28 + 28 + 28
28 + 28 + 28
28 + 28 + 28
DURATION (ms)
Product specification
MGT050
DD
V DD
GND
< V
T] and [4] are
POR
.