BL55021 Datasheet PDF - SHANGHAI BELLING
| Part Number | BL55021 | |
| Description | LCD driver and control circuit | |
| Manufacturers | SHANGHAI BELLING | |
| Logo |  |
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There is a preview and BL55021 download ( pdf file ) link at the bottom of this page. Total 8 Pages | ||
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BL55021
LCD 驱动与控制电路 BL55021
BL55021 是一款通用型 TN/STN 液晶控制和驱动芯片，具有 128 位显示单元的输出能
力，适用于字符/图形/点阵式液晶屏幕。BL55021 具有较宽的工作电压范围和环境条件，
同时还有适合各类微机系统的 3 或 4 线通讯接口。
特点
● 工作电压2.4~ 5.2V
● 内嵌256KHz RC 振荡器
● 可选1/2或1/3偏压和1/2 1/3 或1/4 的占空比
● 可外接32KHz晶片或256KHz频率源输入
● 内嵌时基发生器和看门狗定时器WDT
● 时基或看门狗定时器溢出输出
● 时基/看门狗定时器时钟源
● 可选两种音频
● 32SEG X 4COM的LCD驱动器
● 内嵌的32 x 4位显示RAM内存
● 3/4线串行接口
● 片内LCD驱动频率源
● 多项软件配置和指令模式
● 提供VLCD管脚用于调整LCD操作电压
产品选择
BL550xx
COM
SEG
内置 RC 振荡器
外接晶振
BL55021
4
32
+
+
BL55022
8
32
+
-
BL55066
4
24
-
BL55076
4
40
-
内部框图
http://www.belling.com.cn
-1-
Total 8 Pages
8/11/2006
Wrote by 2006
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BL55021
系统结构
显示内存（RAM）
静态显示内存（RAM）以32 x 4位的格式储存所显示的数据RAM的数据。直接映象
到LCD 驱动器，可以用WRITE命令访问。
RAM映象图
时基和看门狗定时器（WDT）
时基发生器是一个8 态增值尖峰计数器，可以产生准确的时基。WDT由时基发生
器和一个2态增值尖峰计数器组成，它可以在主控制器或其它子系统处于异常状态时产
生中断。WDT 溢出时产生片内WDT 溢出标志，可用一命令选项使时基发生器和WDT
溢出标志输出到/IRQ管脚。时基发生器和WDT 时钟频率有8种，fWDT=32KHz/2n ，
这里的n 值为0~7，由命令项决定；等式中32KHz为系统频率，由片内振荡器(256KHz)
产生。
http://www.belling.com.cn
-5-
Total 8 Pages
8/11/2006
Wrote by 2006
Preview 5 Page |
Part DetailsOn this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for BL55021 electronic component. |
| Information | Total 8 Pages | |
| Link URL | [ Copy URL to Clipboard ] | |
| Download | [ BL55021.PDF Datasheet ] | |
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Featured Datasheets
| Part Number | Description | MFRS |
| BL55021 | The function is LCD driver and control circuit. SHANGHAI BELLING | |
| BL55022 | The function is LCD driver and control circuit. SHANGHAI BELLING | |
| BL55024 | The function is LCD Driver. BELLING |  |
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