參數(shù)資料
型號: SI3232PPT0-EVB
廠商: Silicon Laboratories Inc
文件頁數(shù): 58/128頁
文件大?。?/td> 0K
描述: BOARD EVAL W/SI3200 INTERFACE
標準包裝: 1
系列: ProSLIC®
主要目的: 接口,模擬前端(AFE)
已用 IC / 零件: Si3232
已供物品: 板,CD
Si3232
Preliminary Rev. 0.96
35
Not
Recommended
fo
r N
ew
D
esi
gn
s
Figure 15. Ground Key Detection Circuitry
Table 21. State Transitions During Ground Key Detection
#
Loop
State
LINEFEED
State
ILOOP (mA) ILONG (mA)
LCR
LONGHI
CMHIGH
1
LOOP OPEN
LFS = 3
(TIP-OPEN)
00
0
2
RING-GND
LFS = 3
(TIP-OPEN)
22
–11
1
0
3
RING-GND
LFS = 1
(FWD-ACTIVE)
22
–11
1
4LOOP CLOSURE
LFS = 1
(FWD-ACTIVE)
21
0
1
0
5
LOOP OPEN
LFS = 1
(FWD-ACTIVE)
00
0
I
Q1
LFS
LONGLPF
LONGHITH
Input
Signal
Processor
Digital
LPF
Ground Key
Threshold
Debounce
Filter
+
LONGHI
LONGLOTH
LONGS
LONGE
Interrupt
Logic
LONGDBI
I
Q2
I
Q5
I
Q6
I
LONG
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