W91580 Datasheet, PDF (16/19 Pages) Winbond – 24-MEMORY TONE/PULSE SWITCHABLE DIALER WITH HANDFREE AND HOLD FUNCTIONS

W91580 SERIES
Timing Waveforms, continued
HKS
HFI
H KEY
HFO
ON HOOK
T/P MUTE
HPM MUTE
CHIP ENBLE
HIGH
Figure 3(c).
Note: Changing the state of the HKS signal from high to low will initialize the HFO and HPM MUTE signals.
HKS
KEY IN
DP
T/P MUTE
HPM MUTE
LOW
R
TKID
TRB
TIDP
TPDP
TPR
KT
DTMF
OSC.
LOW
OSCILLATION
Figure 4. Pulse Mode One-key Redialing Timing Diagram (when not first key)
- 16 -