SI3200-X-FS SILABS [Silicon Laboratories], SI3200-X-FS Datasheet - Page 47
SI3200-X-FS
Manufacturer Part Number
SI3200-X-FS
Description
Manufacturer
SILABS [Silicon Laboratories]
Datasheet
1.SI3200-X-FS.pdf
(112 pages)
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I
I
I
I
Q2
Q5
Q6
Q1
#
1
2
3
4
5
LOOP CLOSURE
LOOP OPEN
LOOP OPEN
Processor
RING-GND
RING-GND
Signal
Input
LFS
Loop
State
Table 26. State Transitions During Ground Key Detection
I
LONG
Figure 22. Ground Key Detection Circuitry
(FWD-ACTIVE)
(FWD-ACTIVE)
(FWD-ACTIVE)
(TIP-OPEN)
(TIP-OPEN)
LINEFEED
LONGLPF
Digital
LFS = 3
LFS = 3
LFS = 1
LFS = 1
LFS = 1
LPF
State
LONGHITH
Ground Key
Threshold
Rev. 1.2
LONGLOTH
–
+
I
(mA)
LOOP
22
22
21
0
0
I
(mA)
LONG
–11
–11
Debounce
LONGDBI
0
0
0
Filter
LCR
0
1
1
1
0
LONGHI
LONGHI
Interrupt
LONGE
Logic
0
1
1
0
0
Si3220/25
CMHIGH
0
0
1
0
0
LONGS
47
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