W91F810N Datasheet, PDF (4/26 Pages) Winbond – 23-FLASH MEMORY TONE/PULSE DIALER WITH HANDFREE, LOCK AND HOLD FUNCTIONS

W91F810N SERIES
Pin Description, continued
SYMBOL 22-PIN 24-PIN 28-PIN I/O
FUNCTION
LOCK
6
6
7
I The function of this terminal is to prevent "0"
(W91F810LN/
F810ALN/
dialing and "9" dialing under PABX system long
distance call control. When the first key input after
F811ALN only)
reset is 0 or 9, all key inputs, including the 0 or 9
key, become invalid and the chip generates no
output. The telephone is reinitialized by a reset.
The function of the LOCK pin is shown below:
LOCK PIN
V_DD
Floating
V_SS
FUNCTION
"0", "9" dialing inhibited
Normal dialing Mode
"0" dialing inhibited
H/P MUTE 7
7
8
I The H/P MUTE is a conventional inverter output.
During pulse dialing, flash break or hold period, this
output is active high; otherwise, it remains in low
state.
DP
13
15
18 O N-channel open drain dialing pulse output.
Flash key will cause DP to be active in either tone
mode or pulse mode.
The timing diagram for pulse mode is shown in
Figure 1(a, b).
DTMF
14
16
19 O During pulse dialing, this pin remains in a low state
regardless of the keypad input. In tone mode, it will
output a dual or single tone.
A detailed timing diagram for tone mode is shown in
Figure 2(a, b).
OUTPUT FREQUENCY
Specified Actual Error %
R1
697
699 +0.28
R2
770
766
-0.52
R3
852
848
-0.47
R4
941
948 +0.74
C1
1209
1216 +0.57
C2
1336
1332
-0.30
C3
1477
1472
-0.34
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