SI3233 datasheet(32/100 Pages) SILABS

32 / 100 page

Si3233

Preliminary Rev. 0.5

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 16).

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.

given in Table 28.

Figure 14. Ring Trip Detector

LCS

ISP_OUT

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

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 16

Ring Trip Filter Coefficient

NRTP[12:0]

Indirect Register 23

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).

SI3233 Datasheet(PDF) 32 Page - Silicon Laboratories

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