參數(shù)資料
型號: SI3225PPTX-EVB
廠商: Silicon Laboratories Inc
文件頁數(shù): 56/112頁
文件大?。?/td> 0K
描述: BOARD EVAL W/DISCRETE INTERFACE
設(shè)計(jì)資源: Si3225PPTX-EVB Schematics/Layout
標(biāo)準(zhǔn)包裝: 1
系列: ProSLIC®
主要目的: 接口,模擬前端(AFE)
已用 IC / 零件: Si3225
已供物品: 板,CD
Si3220/25 Si3200/02
48
Rev. 1.3
Not
Recommended
fo
r N
ew
D
esi
gn
s
Figure 22. Ground Key Detection Circuitry
Table 27. 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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