D1723GF datasheet(13/80 Pages) NEC

13 / 80 page

µPD1723GF-013, µPD1723GF-213

PIN NAME

PIN No.

SYMBOL

Beep output pin when momentary key pressed. A 2.25

kHz and 50 % duty square wave is output for approx.

40 ms. This time is equal to the premuting time.

When a momentary key is pressed and the state of the

LCD panel display or output port is changed (valid key)

and at the end of 5 seconds hold during preset memory

scan and scan operations, a beep is output.

To disable the beep, float (leave open) this pin.

The beep output is also used at SK alarm at DK standby.

LCD panel segment signal output (pins 28 to 55) and

key matrix key source signal output (pins 40 to 55)

pins.

56-dot display is performed at the LCD panel by matrix

with the COM1 pin (pin 56) and COM2 pin (pin 57).

Since LCD15/KS15 (pin 40) to LCD0/KS0 (pin 55) share the

key source signal and LCD segment signal, to use them

as key source signals, a reverse current prevention

diode is necessary. For the connection method, see 1.3

“Key Matrix Connection” and 6 “Application Circuits”.

Common signal output to LCD panel.

56-dot display is performed at the LCD panel by matrix

with LCD27 (pin 28) to LCD0/KS0 (pin 55).

Key matrix key return signal input pin.

Since the key source signal output is shared with the

LCD segment signal, do not connect a pull-down resis-

tor to this pin.

DESCRIPTION

OUTPUT

TYPE

BEEP

Beep output

CMOS

pushpull

LCD segment

and key

source

output

CMOS

pushpull

LCD common

signal output

COM1

COM2

CMOS

pushpull

Input

Key return

signal input

LCD27

LCD16

LCD15/KS15

LCD0/KS0

D1723GF Datasheet(PDF) 13 Page - NEC

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