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ZLG7290

Description
I2C LED
File Size263KB,20 Pages
ManufacturerETC
Download Datasheet View All

ZLG7290 Overview

I2C LED

广州周立功单片机发展有限公司
Tel: (020) 38730916
38730917
38730976
38730977
Fax: 38730925
ZLG7290 I
2
C
接口键盘及
LED
驱动器
一 特点
1
2
3
4
5
6
7
I
2
C
串行接口 提供键盘中断信号
可控扫描½数
8
个功½键
方便与处理器接口
可驱动
8
½共阴数码管或
64
只独立
LED
64
个按键
可控任一数码管闪烁
移½
段寻址等控制
可扩展驱动电流和驱动电压
SO24
提供数据译码和循环
可检测任一键的连击次数
多种封装½式
PDIP24
无需外接元件即直接驱
LED
提供工业级器件
二 引脚及说明
采用
24
引脚封装
引脚图如图
1
所示
其引脚功½分述如下
13
12
21
22
3
4
5
6
20
19
14
11
Dig7
Dig6
Dig5
Dig4
Dig3
Dig2
Dig1
Dig0
SDA
SCL
/INT
GND
ZLG7290
1
引脚图
SegA
SegB
SegC
SegD
SegE
SegF
SegG
SegH
VCC
OSC2
OSC1
/RES
23
24
1
2
7
8
9
10
16
18
17
15
三 功½描述
1
键盘部分
ZLG7290
可采样
64
个按键或传感器
1
键盘去抖动处理
可½会出现电平状态反复变化
称½键盘抖动
若不½处理会引起按键盘½令
½键被按下和放开时
2
双键互锁处理
可检测每个按键的连击次数
其基本功½如下
错误 所以要进行去抖动处理 以读取稳定的键盘状态为准
½有两个以上按键被同时按下时
ZLG7290
只采样优先级高的按键 优先顺序为
S1>S2>…>S64
如同时按下
S2
S18
时采样到
S2
3
连击键处理
如果该按键还未释放
该键值连续有效
就像连续压按该键
½某个按键按下时 输出一次键值后
一样 这种功½称为连击 连击次数计数器
RepeatCnt
可区别出单击 某些功½不允许连击 如开
关 或连击 判断连击次数可以检测被按时间 以防止某些功½误操½ 如连续按
5
秒经入参数设½状态
4
Alt
功½键处理
Ctrl
典型应用图中的
S57~S64
为功½键
功½键½实现
2
个以上按键同时按下来扩展按键数目或实现特殊功½ 如
PC
机上的
Shift
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