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| 型號： | 935260687118 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 無繩電話/電話 |
| 英文描述： | TELEPHONE MULTIFUNCTION CKT, PDSO28 |
| 封裝： | PLASTIC, SOT-136, SO-28 |
| 文件頁數(shù)： | 19/56頁 |
| 文件大?。?/td> | 360K |
| 代理商： | 935260687118 |
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2000 May 19
26
Philips Semiconductors
Product specication
One-chip telephone ICs with speech,
dialler and ringer functions
UBA2050(A); UBA2051(A;C)
KEY TONE (PIN KT)
A keytone with a frequency fkt = 597 Hz and a duration tkt = 30 ms (see Fig.27) is generated each time a valid key is
pressed resulting in the expected action, digit keys in tone dialling mode excepted.
Pin KT is a push-pull output and is set LOW when VDD <VPOR.
handbook, full pagewidth
keytone
MGM344
tkt
fkt
tkt
fkt
Fig.27 Keytones via KT output.
tkt = keytone time.
fkt = keytone frequency.
Key sequences
The behaviour of the UBA205xx can be represented as
a State Transition Diagram (STD).
The STD contains the states (rectangles in Fig.28) and
state transitions (arrows) of the set. The upper arrow in the
figure pointing to the standby state means that the set is
initially in the standby state. When, for instance, an
incoming call is detected, the set enters the ringer state,
waiting for end of a ringer signal or off-hook. If the set goes
off-hook, the UBA205xx enters the on-line state.
The UBA205xx has 3 basic states:
Standby state
Ringer state
On-line state.
Each state with its own functional requirements is
described in the following sections.
STANDBY STATE
In the standby state the UBA205xx is inactive. The current
drawn is for memory retention; the loads on the
inputs/outputs of the dialler have influence on the retention
current.
The UBA205xx leaves the standby state if:
The set goes off-hook (lift handset)
A ringer signal is available on the line.
The UBA205xx returns to the standby state if:
The set goes on-hook (handset on-hook)
A line-break occurs with a duration greater than tRD
The ringer signal becomes invalid.
RINGER STATE
If the set is in standby state, a ringer signal can be received
from the line. After evaluating the incoming ringer signal
(and the ringer signal is valid), the UBA205xx starts a
melody via the MDY/TONE output and ringer hardware;
this melody is stopped when the ringer signal is no longer
valid. After going off-hook, the ringer signal stops and the
set is in the conversation (on-line) state.
While ringing, the melody can be changed according to
Table 8 and the volume according to Table 9.
As long as memory retention conditions are fulfilled,
melody and volume are stored.
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