NJU6010 データシートの表示（PDF） - Japan Radio Corporation

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NJU6010

24 keys input key-scan IC

Japan Radio Corporation  

NJU6010 Preliminary

! TERMINAL DESCRIPTION

No.

SYMBOL

1

TEST

2

CSb

3

SCL

4

DATA

5~8

9

10 ~ 15

16

S0 ~ S3

VSS

K0 ~ K5

VDD

FUNCTION

Oscillation Circuit Test Terminal

Data output is available by "L".

Serial Clock Input Terminal

Serial Data Output Terminal (This terminal outputs both the serial data

and REQ signals.)

CSb=”H” : Request signal output, CSb=”L” : Key data output

Key Scanning Output Terminals

GND Terminal

Key Scanning Input Terminals

Power Source Terminal

! FUNCTIONAL DESCRIPTION

(1) Description for Each Blocks

• Serial I/F

The Serial I/F operates control of output signal.

• Power ON Reset Circuit

The Power ON Reset Circuit initializes the key register automatically at Power ON.

• Key-scan Circuit

When the key pressed, the Key-scan Circuit output the request signal from DATA terminal. The key data is

kept in the key register until CPU starts reading key data.

• Key Register

The Key Register keeps the read key data.

• Oscillation Circuit

The oscillation circuit is built-in.

(2) Key-scan Circuit

The Key-scan Circuit consists of a detector block of key pressing (S0~S3) and a fetching block of key

status (K0~K5). The Key-scan Circuit connects the 4x6 key-matrix and reads the data of 24 keys

maximum as shown in Fig1. Furthermore, it operates correctly against the multiple key inputs.

(Conditional)

NJU6010

K5 K4 K3 K2 K1 K0

S3 S2 S1 S0

ON

OFF

SW KEY

Fig. 1 Key-scan Matrix

-2-

Ver.2009-08-20

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