W91030 Ver la hoja de datos (PDF) - Winbond

Número de pieza

componentes Descripción

Fabricante

W91030

CALLING LINE IDENTIFIER

Winbond 

Preliminary W91030B

FUNCTIONAL DESCRIPTION

Figure 6 is shown functional blocks of W91030B. The device must operate with a 3.579545 MHz

system clock and consists four major functions and decribed as follows:

Ring Detector

The application circuit in Figure 7-1 illustrates the relationship between the RNGDI, RNGRC and

RNGON signals. The three pin combination is used to detect an increase of the RNGDI voltage from

ground to a level above the Schmitt trigger high going threshold voltage VT+.

C1 = 0.1uF

Tip/A

R1 = 470K

Ring/B

C1 = 0.1 uF

R2 = 470 K

V DD

W91030B

R3 = 200 K

RNGDI

R4 = 300 K

V DD

R5 = 150 K

RNGRC

C3 = 0.22 uF

Allowance minimal ring voltage (peak to peak) is:

Vpp (max ring) = 2 (V T+(max) (R1 + R3 + R4) / R4 + 0.7)

Tolerance to noise between Tip and Ring and Vss is:

Vpeak (max noise) = V T+(min) (R1 + R3 + R4) / R4 + 0.7

Time constant is:

T = R5 C3 ln [VDD / (VDD - V T+ )]

V T+(min) <= V T+ <= V T+(max)

RNGON

R5 from 10K ohm to 500K ohm.

C3 from 47 nF to 0.68 uF.

Figure 7-1. Application Circuit of the Ring Detecter

The RC time constant of the RNGRC pin is used to delay the output pulse of the RNGON pin for a

low going edge on RNGDI. This edge goes from above the VT+ voltage to the Schmitt trigger low

going threshold voltage VT-. The RC time constant must be greater than the maximum period of the

ring signal, to ensure a minimum RNGON low interval and to filter the ring signal to get an envelope

output.

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