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參數(shù)資料
| 型號(hào)： | STLC3080 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | SUBSCRIBER LINE INTERFACE CIRCUIT |
| 中文描述： | 用戶線路接口電路 |
| 文件頁(yè)數(shù)： | 20/23頁(yè) |
| 文件大小： | 201K |
| 代理商： | STLC3080 |
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In ringing mode the STLC3080 provides:
- Relay driver capability(relay is synchronized
withlow level of CKRING)
- Ring-Trip detection
The monitor of the line state is performed by
sensing the line current converted into a voltage
drop across the RR resistor connected in series
to the line. This voltage is read via RS1and RST2
input pins of a differential stage that identifies,
during the ringing phase, the ON/OFF HOOK
state of the line(see Fig. D1).
The Ring-Trip condition is detected by sensing
the DC component of the line current, rejecting
the AC component. With RR = 600
the Ring-
Trip thresholdis: Iline>7.5mA
When the Ring-Trip is detected, the STLC3080:
- deactivatesthe ringing relay RELR (if CKRING
is low);
- indicates the ring-trip detectionby setting
DET=low;
- forcesthe Active state.
The information at RELR and DET pins is lached
and it doesn’t change opening the current loop.
To reset the latched informations the Active or
On-Hook Transmission mode have to be entered
(in general changing the device mode the latched
informationis removed).
Although the ring-trip detection sets DET to signal
the line status, there is a substantialdifference re-
spect to the on/off-hook detection. In Ringing
mode on-hook condition, an AC current is present
on the line. The ring-trip detector rejects the AC
component by integrating the line current: the de-
tection threshold can be reached only if the line
current has a DC component higher than the
threshold. As a consequencethe response is not
immediate (as it is for off-hook in Active state): it
takes an amount of time that is dependenton the
DC current value (i.e. on the line length). The AC
rejection and the delay depend on the CRT ca-
pacitorvalue (see Fig.D1).
When the voltage on the capacitor exceeds 3V,
the Ring-Trip is detected (see fig.D3). CRT
should be selected in order to avoid that during
one half sinewave cycle, in on-hook, its voltage
VCRT exceeds 3V (ring-trip threshold). The mini-
mum value of CRT can be carried out with the fol-
lowingformula:
Ccrt> 6
μ
F/Fring
With Fring = 20Hz, you obtain a Ccrt = 390nF.
When the CRT capacitor is selected, it must be
considered that it is also used for the rejection of
the common mode current. In this case the mini-
mum value of the CRT capacitor can be carried
out with the following formula:
Ccrt> (Ip/Fl)
560
μ
F
Where Ip is the peak of the longitutudinal current
and Fl is the frequency of this current. With Ip =
25mA @ Fl = 50Hz you obtain 330nF.
For this reasons the suggested value for typical
centraloffice application is 470nF.
APPENDIX D
RINGING MODE AND RING TRIP DETECTION
RS1
RS2
RR
VB
CRT
I
LINE
I
CRT
VCC
I
th
=7.5uA(typ)
DET
3Volt
COMP
I
RING
I
RING=
I
LINE
RS1/RR
RS1=RS2
Figure D1.ring trip circuit blockdiagram.
STLC3080
20/23
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