參數(shù)資料
型號: Si3232
廠商: Electronic Theatre Controls, Inc.
英文描述: DUAL PROGRAMMABLE CMOS SLIC WITH LINE MONITORING
中文描述: 兩個可編程的CMOS用戶接口與在線監(jiān)測
文件頁數(shù): 35/128頁
文件大?。?/td> 2327K
代理商: SI3232
Si3232
Preliminary Rev. 0.96
35
Figure 15. Ground Key Detection Circuitry
Table 21. State Transitions During Ground Key Detection
#
Loop
State
LINEFEED
State
I
LOOP
(mA)
I
LONG
(mA)
LCR
LONGHI
CMHIGH
1
LOOP OPEN
LFS = 3
(TIP-OPEN)
0
0
0
0
0
2
RING-GND
LFS = 3
(TIP-OPEN)
22
–11
1
1
0
3
RING-GND
LFS = 1
(FWD-ACTIVE)
22
–11
1
1
1
4
LOOP CLOSURE
LFS = 1
(FWD-ACTIVE)
21
0
1
0
0
5
LOOP OPEN
LFS = 1
(FWD-ACTIVE)
0
0
0
0
0
I
Q1
I
Q2
I
Q5
I
Q6
LFS
LONGLPF
LONGHITH
Input
Signal
Processor
Digital
LPF
Ground Key
Threshold
Debounce
Filter
+
LONGHI
LONGLOTH
LONGS
LONGE
Interrupt
Logic
LONGDBI
I
LONG
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