HT1621 Datasheet, PDF (1/20 Pages) Holtek Semiconductor Inc – RAM Mapping 32x4 LCD Controller for I/O C

HT1621
RAM Mapping 32´4 LCD Controller for I/O mC
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
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 applica-
tions including LCD modules and display sub-
systems. Only three or four lines are required
for the interface between the host controller
and the HT1621. The HT1621 contains a power
down command to reduce power consumption.
Selection Table
HT162X HT1620 HT1621 HT1622 HT16220 HT1623 HT1625 HT1626 HT1627 HT16270
COM
4
4
8
8
8
8
16
16
16
SEG
32
32
32
32
48
64
48
64
64
Built-in Osc.
Ö
Ö
Ö
Ö
Ö
Ö
Crystal Osc. Ö
Ö
Ö
Ö
Ö
Ö
Ö
1
April 21, 2000