參數(shù)資料
型號(hào)： 935260690118
廠商： NXP SEMICONDUCTORS
元件分類(lèi)： 無(wú)繩電話/電話
英文描述： TELEPHONE MULTIFUNCTION CKT, PDSO28
封裝： PLASTIC, SOT-136, SO-28
文件頁(yè)數(shù)： 10/56頁(yè)
文件大小： 360K
代理商： 935260690118
2000 May 19
18
Philips Semiconductors
Product specication
One-chip telephone ICs with speech,
dialler and ringer functions
UBA2050(A); UBA2051(A;C)
INTERNAL RESET CIRCUIT (PINS CE/FDI AND CE/CSI)
A reset signal is internally generated to initialize the
UBA205xx as follows (see Fig.18):
By the on-chip Power-On Reset (POR) circuit as long as
VDD is lower than VPOR
When the voltage on pin CE/CSI and on pin CE/FDI are
both LOW for a time greater than the reset delay
time tRD.
When reset conditions are fulfilled, pins MDY/TONE and
DP/FL are set to high-impedance; pins DMO, KT, LED,
R1 to R4 and C1 to C4 are set to LOW.
CHIP ENABLE AND FREQUENCY DISCRIMINATOR INPUT
(PIN CE/FDI)
This input is used to activate and initialize part of the
system. This pin together with the pin CE/CSI determines
which mode to enter (see Table 2) and detects line power
breaks during on-line states. To prevent the dialler from
reacting on voltage disturbances on the telephone line, a
time-out is active. The dialler returns to the standby state
if the voltage on both pins CE/CSI and CE/FDI is LOW for
a time greater than tRD.
In the exchange, several AC signals can be superimposed
on the DC signal, e.g. dialling tone, busy tone,
disturbances (such as line power breaks) and ringer
signal. The ringer signal is evaluated and checked if its
frequency is above a specified ringer frequency fring. It is
assumed that the frequency at pin CE/FDI is the same as
the ringer frequency present on the telephone line.
The signal at this pin is half-wave rectified so that the
dialler can easily detect zero-crossing, especially at high
frequency.
During switching (on-hook/off-hook and pulse dialling) this
pin is protected by its ESD diodes. The maximum input
current on these diodes should be below 1 mA.
CHIP ENABLE/CRADLE SWITCH INPUT (PIN CE/CSI)
To distinguish between different operating states an extra
CE/CSI input is used. Comparable to the CE/FDI input, the
CE/CSI activates the dialler part. From that moment the
dialler part polls this input and the CE/FDI input regularly
for line power breaks during on-line states. When pins
CE/CSI and CE/FDI are set LOW for a time greater than
tRD, the standby state is entered. Pin CE/CSI is set HIGH
during the off-hook situation (basic application). The basic
states are shown in Table 2.
Table 2
UBA205xx basic states
Notes
1. Don’t care.
2. AC signal at pin CE/FDI.
During switching (on-hook/off-hook and pulse dialling) this
pin is protected by its ESD diodes. The maximum input
current on these diodes should be below 1 mA.
RINGER MELODY (PIN MDY/TONE)
When an incoming ringer signal at pin CE/FDI is valid, the
UBA205xx starts generating a melody via the MDY/TONE
output ringer hardware (see Fig.35). The signal at
pin MDY/TONE is a square wave signal (see Fig.19).
This melody follows the cadence of the ringer signal. Both
the melody and the volume can be selected via the
keyboard.
The melody frequencies and the duration are given in
Table 3. Table 8 shows how a melody can be selected by
pressing a key during ringing. The melody setting will be
stored in the memory.
The volume of the ringer circuit can be controlled by
changing the amplitude of the square wave. The voltage
level at pin MDY/TONE can be changed as shown in
Table 9. The volume setting will be stored in the memory.
MDY/TONE is a push-pull output. MDY/TONE is
high-impedance when VDD <VPOR.
handbook, halfpage
MGM334
NOR
POR
OR
reset
CE/CSI
CE/FDI
VDD
Fig.18 Internal reset.
INPUT CE/CSI
INPUT CE/FDI
STATE
LOW
standby
HIGH
X; note 1
handset
LOW
HIGH
ringer; note 2
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