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| 型號： | SI3230PPQX-EVB |
| 廠商： | Silicon Laboratories Inc |
| 文件頁數(shù)： | 35/108頁 |
| 文件大?。?/td> | 0K |
| 描述： | BOARD EVAL W/DISCRETE INTERFACE |
| 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： | Si3230 |
| 已供物品： | 板，CD |
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Si3230
32
Preliminary Rev. 0.96
Not
Recommended
fo
r N
ew
D
esi
gn
s
ringing state as indicated by the Linefeed Shadow
register (direct Register 64). The data then feeds into a
programmable digital low pass filter, which removes
unwanted ac signal components before threshold
detection.
The output of the low pass filter is compared to a
programmable threshold, RPTP (indirect Register 29).
The threshold comparator output feeds a programmable
debouncing filter. The output of the debouncing filter
remains in its present state unless the input remains in
the opposite state for the entire period of time
programmed
by
the
ring
trip
debounce
interval,
RTDI[6:0] (direct Register 70). If the debounce interval
has been satisfied, the RTP bit of direct Register 68 will
be set to indicate that a valid ring trip has occurred. A
ring trip interrupt is generated if enabled by the RTIE bit
(direct Register 22). Table 27 lists the registers that
must be written or monitored to correctly detect a ring
trip condition.
The recommended values for RPTP, NRTP, and RTDI
vary according to the programmed ringing frequency.
Register values for various ringing frequencies are
given in Table 28.
Figure 14. Ring Trip Detector
LCS
ISP_O UT
LFS
NRTP
RPTP
RTDI
Input
Signal
Processor
Digital
LPF
Ring Trip
Threshold
Debounce
Filter
+
–
RTP
RTIP
RTIE
Interrupt
Logic
DBIRAW
Table 27. Associated Registers for Ring Trip Detection
Parameter
Register
Location
Ring Trip Interrupt Pending
RTIP
Direct Register 19
Ring Trip Interrupt Enable
RTIE
Direct Register 22
Ring Trip Detect Debounce Interval
RTDI[6:0]
Direct Register 70
Ring Trip Threshold
RPTP[5:0]
Indirect Register 29
Ring Trip Filter Coefficient
NRTP[12:0]
Indirect Register 36
Ring Trip Detect Status (monitor only)
RTP
Direct Register 68
Note:
The ProSLIC uses registers that are both directly and indirectly mapped. A “direct” register is one that is mapped
directly. An “indirect” register is one that is accessed using the indirect access registers (direct registers 28 through
31).
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