HT1621B Datasheet, PDF (1/20 Pages) Holtek Semiconductor Inc – RAM Mapping 32x4 LCD Controller for I/O MCU

HT1621
RAM Mapping 32´4 LCD Controller for I/O MCU
Features
· Operating voltage: 2.4V~5.2V
· Built-in 256kHz RC oscillator
· External 32.768kHz crystal or 256kHz frequency
source input
· Selection of 1/2 or 1/3 bias, and selection of 1/2 or
1/3 or 1/4 duty LCD applications
· Internal time base frequency sources
· Two selectable buzzer frequencies (2kHz/4kHz)
· Power down command reduces power consumption
· Built-in time base generator and WDT
· Time base or WDT overflow output
· 8 kinds of time base/WDT clock sources
· 32´4 LCD driver
· Built-in 32´4 bit display RAM
· 3-wire serial interface
· 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
· HT1621: 48-pin SSOP package
HT1621B: 48-pin DIP/SSOP/LQFP package
HT1621D: 28-pin SKDIP package
HT1621G: Gold bumped chip
General Description
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-
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.
Selection Table
HT162X
HT1620
COM
4
SEG
32
Built-in Osc.
¾
Crystal Osc.
Ö
HT1621
4
32
Ö
Ö
HT1622
8
32
Ö
¾
HT16220
8
32
¾
Ö
HT1623
8
48
Ö
Ö
HT1625
8
64
Ö
Ö
HT1626
16
48
Ö
Ö
Rev. 1.30
1
August 6, 2003