UPD16431AGC-7ET Просмотр технического описания (PDF) - NEC => Renesas Technology

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производитель

UPD16431AGC-7ET

1/2, 1/3, 1/4-DUTY LCD CONTROLLER/DRIVER

NEC => Renesas Technology 

µPD16431A

PIN FUNCTIONS

Symbol

SEG1/KS1 to

SEG8/KS8

SEG9 to SEG48

SEG49/LED1 to

SEG56/LED8

COM1 to COM4

SCK

Name

Segment output/key

source output

Segment output

Segment output/LED

output pins

Common output

Shift clock input

DATA

Data input/output

STB

LCD/LED

Strobe input

LCD/LED select

OE Note

Output enable input

OSCIN

OSCOUT

SYNC

Oscillation input

Oscillation output

Synchronizing signal

KEY1 to KEY4

KEY REQ

Key data input

Key request output

VDD

VSS

VLCD

VEE

VLC1 to VLC3

Logic power supply

Logic GND

LCD drive power supply

LCD GND

Power supply for LCD

drive

No.

25 to 32

33 to 72

73 to 80

21 to 24

7

8

9

10

11

Description

These pins serve as LCD segment output pins and key

source output pins for key scanning.

LCD segment output pins

These pins can be used as LCD segment output or LED

output pins depending on the setting of the LCD/LED pin.

LCD common output pins

Data shift clock. Data is read at the rising edge, and is

output at the falling edge of this clock.

This pin inputs a command or display data, or outputs

key data.

A command or data is input at the rising edge of the shift

clock, starting from the most significant bit. Key data is

output at the falling edge of the shift clock, starting from

the most significant bit.

This pin serves as an open-drain pin in the output mode.

Data can be input when this signal goes low. When it

goes high, command processing is performed.

When this signal goes high, the SEGn/LEDm pins function

as LCD segment output pins; when it goes low, they

function as LED driver output pins. The LED driver has a

drive capability of 15 mA and is N-ch open drain.

When this signal goes low, all the segment output and

LED output pins are off (SEGn = COMn = VLCD). Internal

data are saved.

12

13

14

2 to 5

6

15

1

16

20

17 to 19

Connect a resistor for oscillation circuit across these pins.

A synchronizing signal input pin. When two or more

µPD16431A’s are used, each device is wired-ORed. This

pin must be pulled up when this chip is used alone.

Key data input pins for key scanning

This signal goes high when a key is pressed (key data = H).

Read the key data only while this pin is high.

Power supply pin for internal logic

GND pin for internal logic and LED output

Power supply pin for LCD drive

GND pin for LCD drive

Power supply for driving dot matrix LCD

Note At OE = L, the key data cannot be written correctly, even when the display ON/OFF of the status

command is set to the “normal operation” (10). Also, in this state, unnecessary waveforms are

generated from between SEG1/KS1 to SEG8/KS8 during the key scanning period. (The display is OFF.)

4

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