W91572DNF データシートの表示（PDF） - Winbond

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W91572DNF

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

Winbond 

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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