Maxim-integrated 73M1866B/73M1966B Implementers Guide Instrukcja Użytkownika Pobierz pdf (Strona 21)

UG_1x66B_016 73M1866B/73M1966B Implementer’s Guide

Rev. 1.3 21

The registers used for Ring Detection and Line Voltage Reversal are:

0x05 ENGPIO7 ENGPIO6 ENGPIO5 ENPCLKDT ENAPOL ENDET ENSYNL ENRGDT

Write X

0x0E FRCVCO Res Res Res Res Res RGTH1 RGTH0

Write X

X X X X X

Threshold

0x03 GPIO7 GPIO6 GPIO5 PCLKDT RGMON DET SYNL RGDT

Write X

X X X X X

Set the ring detect threshold voltage

Set ENRGT = 1 in Register 0x05 to enable the RGMON and RGDT interrupts. See Section

(Threshold) in the RGTH[1:0] bits in Register 0x0E.

6 Interrupt

Processing for more information on interrupts.

The system variables defined in this procedure are:

ring_count = initial 0, keeps track of number of ring

interrupts

ring_first = time of first ring interrupt

ring_last = time of last ring interrupt

ring_frequency = ring frequency in HZ

ring_duration = ring duration

Begin @ RGDT interrupt (RGDT = 1)

1. If (ring_count == 0) ring_first = now;

2. ring_last = now

3. start/restart ring_timer for approx 150 ms

End

Begin @ ring_timer expire

1. If (ring_last - ring_first) < 150 ms Polarity Reversal Event

2. Else Ring Burst

a. ring_duration = ring_last – ring_first

b. ring_frequency – 2* ring_count / ring_duration)

End

The ring detect threshold is country specific. The recommended values are shown in the 73M1x66

Worldwide Design Guide.

@RGDT

If(ring_count == 0)

Ring_last = now

Ring_count++

Restart

ring_timer

End

If(ring_count == 0)

ring_first = now

@ ring_timer

expires

If(ring_last –

ring_first) <

150ms

RING_BURST

End

Polarity

Reversal

TRUE

1 2 ... 16 17 18 19 20 21 22 23 24 25 26 27 28 29

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