W91576DNF 데이터 시트보기 (PDF) - Winbond
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W91576DNF Datasheet PDF : 45 Pages
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W91570DN SERIES
Pin Description, continued
SYMBOL PIN NO.
B/M
11
LOCK
10
(for all lock
version)
COM1 to
COM4
SEG1 to
SEG32
VLCD
CP, CN
49 to 52
53 to 80,
1 to 4
45
48, 47
VDD, VSS
XT2, XT2
VRTC1,
VRTC2
SET RTC
9, 14
43, 44
38, 46
13
I/O
FUNCTION
I Make:Break ratio select pin.
If B/M = VDD, the M/B ratio is 40:60.
If B/M = VSS, the M/B ratio is 33.3:66.7.
The B/M pin is pulled to VDD by internal resistor.
I The LOCK pin is used to prevent "0" or "9" dialing under PABX
system long distance call control. When the first key input after
reset is "0" or "9", all the key inputs, including "0" or "9" key,
become invalid, and the chip generates no output.
The telephone is reinitialized by a reset.
The following table describes the functions of the LOCK pin:
LOCK PIN
Floating
VDD
VSS
FUNCTION
Normal dialing
"0", "9" dialing inhibited
"0" dialing inhibited
O COM1 to COM4 are the common signal output terminal for the
1/4 duty LCD.
O SEG1 to SEG32 are the 16-digit segment signal outputs.
O Power supply pin for LCD driver.
A 0.1 µF capacitor is connected between VLCD and VSS.
CP is the voltage control capacitor positive pin.
I CN is the voltage control capacitor negative pin.
A 0.1µF capacitor is connected between these two pins.
I Power input pins.
I, A quartz crystal oscillator provides an RTC frequency time base
O of 32.768 KHz.
I Either VRTC1 should be connected to a 1.5V battery
(W91572DN/576DN) or VRTC2 should be connected to a 3.0V
battery(W91574DN/578DN), which supplies the power source
for the RTC.
I In the chip enable state, pulling SET RTC to VSS toggles the
RTC set function on/off, when the set function is toggled on, the
RTC can be set using the "HOUR" and "MIN" keypads.
Publication Release Date: May 1997
-5-
Revision A2
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