型号: HT1621
厂商: Holtek Semiconductor Inc Holtek Semiconductor Inc
描述: ram mapping 32x4 lcd controller for I/O C
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HT1621  
RAM Mapping 32´4 LCD Controller for I/O MCU  
Technical Document  
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Features  
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Operating voltage: 2.4V~5.2V  
32´4 LCD driver  
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Built-in 256kHz RC oscillator  
Built-in 32´4 bit display RAM  
3-wire serial interface  
External 32.768kHz crystal or 256kHz frequency  
source input  
Internal LCD driving frequency source  
Software configuration feature  
Data mode and command mode instructions  
R/W address auto increment  
Three data accessing modes  
VLCD pin for adjusting LCD operating voltage  
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Selection of 1/2 or 1/3 bias, and selection of 1/2 or  
1/3 or 1/4 duty LCD applications  
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Internal time base frequency sources  
Two selectable buzzer frequencies (2kHz/4kHz)  
Power down command reduces power consumption  
Built-in time base generator and WDT  
HT1621B: 48-pin SSOP/LQFP packages  
HT1621D: 28-pin SKDIP package  
HT1621G: Gold bumped chip  
Time base or WDT overflow output  
8 kinds of time base/WDT clock sources  
General Description  
systems. Only three or four lines are required for the in-  
terface between the host controller and the HT1621.  
The HT1621 contains a power down command to re-  
duce power consumption.  
The HT1621 is a 128 pattern (32´4), memory mapping,  
and multi-function LCD driver. The S/W configuration  
feature of the HT1621 makes it suitable for multiple LCD  
applications including LCD modules and display sub-  
Selection Table  
HT162X  
HT1620  
HT1621  
HT1622  
HT16220  
HT1623  
HT1625  
HT1626  
COM  
SEG  
4
32  
¾
Ö
4
32  
Ö
8
32  
Ö
8
32  
¾
Ö
8
48  
Ö
8
64  
Ö
16  
48  
Ö
Built-in Osc.  
Crystal Osc.  
Ö
¾
Ö
Ö
Ö
Rev. 1.70  
1
June 29, 2005