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參數(shù)資料
| 型號(hào)： | SC88E43S |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | EXTENDED VOLTAGE CALLING NUMBER IDENTIFICATION CIRCUIT 2 |
| 中文描述： | 更廣的電壓主叫號(hào)碼識(shí)別電路2 |
| 文件頁數(shù)： | 9/25頁 |
| 文件大?。?/td> | 389K |
| 代理商： | SC88E43S |
Silan
Semiconductors
SC88E43
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.0
2000.12.31
9
FUNCTIONAL DESCRIPTION
Detection of CLIP/CID Call Arrival Indicators
The
cricuit in Figure 3 illustrates the relationship between the
TRIGRC
and
TRIGout
sig
nals.Tpically,the three
pin combination is used to detect an event indicated by an increase of the TRIGin voltage from V
ss
to above the
Schmitt trigger high going threshold V
T+
(see DC electrical characteristics).
Figure 3 shows a circuit to detect any one of three CLIP/CID call arrival indicators:line reversal,ring burst and
ringing.
To determine values for C3 and R5:
R5C3=-t/ln(1-V
TRIGRC
/V
DD
)
max VT+=0.68 V
DD
min V
T+
=0.48 V
DD
V
DD
SC88E43
TRIGin
TRIGRC
TRIGout
C
R
R3=200k
R
R1=499k
R2=499k
V1
V3
V4
C2=100nF
C1=100nF
Tip/A
Ring/B
To Microcontroller
Notes:
The application circuit must ensure rhat, V
TRIGin
>max V
T+
Where max V
=3.74V @V
=5.5V.
Tolerance to noise between A/B and V
is:
max Vnoise=(min V
)/0.30+0.7=5.6Vrms@4.5VV
DD
Suggested R5C3 component values:
R5 from 10k
to 500k
; C3 from 47nF to 0.68
μ
F
An example is C3=220nF, R5=150k
; TRIGout low from
21.6ms to 37.6ms after TRIGin Signal stops triggering the
circuit.
Figure 3 Circuit to Detect Line Reversal, Ring Burst and Ringing
1.Line Reversal Detection
Line reversal,or polarity reversal on the A and B wires indicates the arrival of an inconming CDScall,as soecified in
SIN227.When the event (line reversal) occurs,TRIGin rises past the high going Schmitt threshold V
T+
and
TRIGou
,which is normally high,is pulled low going Schmitt threshold V
T-
and
TRIGout
returns high.The
t
components R5 and C3 (see Figure 3) at
TRIGout
low interval.
In a TE designed for CLIP,the
TRIGout
high to low transition may be used to interrupt or wake-up the micro-
controller.The controller can thus be put into power-down mode to conserve power in a battery operater TE.
2.Ring Buost Detection
CCA doesnot support the dual tone alert signal (refer to Dual Tone Alert single burst og ringing (duration 200-
450ms) that precedes CLIPFSK data.The ring burst may vary fron 30 to 75Vrms and is approximately 25Hz.
Again in aTEdesigned for CCA CLIP ,the
t
TRIGou
high to low reansition may be used to interrupt or wake-up the
microcontroller.The controller can thus be put into power-down mode to conserve powerin a battery operated TE.
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