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參數(shù)資料
| 型號： | L3092 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | Subscriber Line Interface(用于短波/超短波通信系統(tǒng)的用戶線接口) |
| 中文描述： | 用戶線接口（用于短波/超短波通信系統(tǒng)的用戶線接口） |
| 文件頁數(shù)： | 10/32頁 |
| 文件大小： | 412K |
| 代理商： | L3092 |
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4) AUTOMATIC STAND - BY (ASB) MODE
This is an operating mode similar to the Power
Down Mode, but with the software procedure to
detect off-hook condition integrated in hardware
on chip.
Fig. 5 shows the functional circuit activated in this
mode.
When the off-hook condition occurs RING wire
voltagegoes high (from - 48Vto -24V).
The output of the comparatorC1 will go high set-
ting the output of the flip- flop FF high.
Therefore L3092 will set L3000N in Stand-bypro-
viding a groundsignal at pin PDO.
At the same time the external capacitor CINT will
be slowlycharged.
In Stand-by the internal off-hook Detection circuit
will be activated andwill check if the off-hook con-
dition detected by the comparatorC1 was true or
not true.
If the off-hook condition is confirmed the SLIC will
be kept in Stand-by Mode and the output ONHK
will go low when CS is low.
If the off-hookcondition is not confirmedthe SLIC
will be kept in Stand - By only for a few seconds.
(typ. 5sec). When the voltage at CRT out put will
reach the V
REF
value the C2 comparatorwill reset
the FF Flip - Flop and therefore the SLIC will be
set againin PowerDown.
The Automatic Stand-by (ASBY) Mode combine
the key characteristics of Power Down (PD) and
Stand-by (SBY) Modes in particular it is charac-
terized by a very low power consumption (as the
Power Down mode) and a sophisticated off hook
detectioncircuit (as the Stand-Bymode).
The card controller will receive the off-hook infor-
mation from the pin ONHK only after that it is
checked and confirmed by the internal off-hook
detector that is not sensitive to spikes and com-
mon mode line signal. Therefore the software re-
quired to manage the SLIC will be very simple.
5) TEST (TS) MODE
When this mode is activated the SLIC will be set
in conversation mode keeping the initial value of
limiting current.
The GDK output pin of L3092 Digital Interface will
be set to ”0” if the SLIC is operating in the limiting
current region of the DC characteristic, see fig. 1
and 2. GDK output will be set to 1 if the SLIC is
operatingin the resistive region.
The SLIC will work in one of the two region de-
pending on the loop resistance and the pro-
grammed limiting current value.
By changing the liming current value selected in
conversation mode it is possible to measure the
Loop Resistance and therefore the line lenght
connected to the SLIC.
The followingtable showsthe rangesof the loop re-
sistance that set the GDK output pin to high and
lowlevel incorrespondanceof all thepossiblelimit-
ingcurrent values (25/40/60mA)with RFS = 200
.
Figure5:
Off-hookDetection Circuitin AutomaticStandbyMode
L3000N
L3000N - L3092
10/32
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
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| L3092FN | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:SLIC KIT OPTIMIZED FOR APPLICATIONS WITH BOTH FIRST AND SECOND GENERATION COMBOS |
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| L3092NT | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Telecommunication IC |
| L3092TFN | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Telecomm Interface， Other/Special/Misc |
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