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W91572DNF

23-MEMORY TONE/PULSE DIALER WITH AUTOREDIAL RTC AND LCD DISPLAY FUNCTIONS

Winbond 

W91570DN SERIES

Timing Waveforms, continued

HKS

HFI

HOLD KEY

HFO

T/P MUTE

H/P MUTE

CHIP ENBLE

ON HOOK

High

Figure 10(c). Hold and Handfree Timing Diagram

Note: Changing the state of the HKS signal from high to low will initialize the HFO and HPM MUTE signals.

KEY IN

KT

DP/C10

OKR

TKD

TARB

TARP

AUTO

REDIALING

INTERVAL

WAITING

INTERVAL

OSC.

REPEAT TILL

N-1 TIMES

TARB

TARP

AUTO

REDIALING

INTERVAL

WAITING

INTERVAL

OSCILLATION

Figure 11(a). Auto Redialing Timing Diagram

Notes:

1. The auto redial function is enabled in off-hook or handfree state.

2. If OKR is the first key-in after off-hook or handfree then the first TARB and TARP will be ignored.

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