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W91820ALN

13-MEMORY TONE/PULSE DIALER WITH HANDFREE, LOCK AND HOLD FUNCTIONS

Winbond 

W91820N SERIES

Timing Waveforms, continued

HKS

KEY IN

DTMF

T/P MUTE

H/P MUTE

KT

DP

OSC.

ON HOOK

R/P

TKID

TTD

T

T > TOHD

TITP

LOW

(return to initial state)

HIGH

OSC.

Figure 2(c). Tone Mode Timing Diagram with On-hook Debounce (Auto dialing)

HKS

OFF HOOK

HFI

ON HOOK

H KEY

HFO

T/P MUTE

H/P MUTE

HIGH

LOW

CHIP ENABLE

Note: The H KEY can not be enabled during chip dissable.

Figure 3(a)

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