HD66421 Datasheet, PDF (1/46 Pages) Hitachi Semiconductor – (RAM-Provided 160 Channel 4-Level Grey Scale Driver for Dot Matrix Graphics LCD)

Preliminary
Rev. 1.1E '99.02.10
HD66421
HD66421
(RAM-Provided 160 Channel 4-Level Grey Scale Driver
for Dot Matrix Graphics LCD)
Description
The HD66421 drives and controls a dot matrix
graphic LCD(Liquid Crystal Display) using a
bit-mapped method. It provides a highly
flexible display through its on-chip display
RAM, in which each two bits of data can be
used to turn on or off one dot on LCD panel
with four-level grey scale.
A single HD66421 can display a maximum of
160x100 dots using its powerful display
control functions. It can display only eight
lines out of one hundred lines.
This function realize low power consumption
because high voltage for driving LCD is not
needed.
An MPU can access HD66421 at any time,
because the MPU operations are asynchronous
with the HD66421's system clock and display
operation.
Its low-voltage operation at 2.2 to 5.5V and
standby function provides low power
-dissipation, making the HD66421 suitable for
small portable device applications.
Features
• Built-in bit-mapped display RAM: 30kbits
(160 x 100 x 2 bits)
• Grey scale display: PWM four-level grey
scale can be selected from 32 levels
• Grey scale memory management: Packed
pixel
• Monochrome display: two planes can be
selected. One plane is displayed while the other
plane is being written.
• Partial display: Eight-lines data can be
displayed in any place
• An 80-system MPU interface
• Power supply voltage for operation : 2.2V to
5.5V
• Power supply voltage for LCD : 18 V max.
• Selectable multiplex duty ratio: 1/8, 1/64, 1/80,
1/100
• LCD driving alternating cycle: 7, 11, 13 lines
or flame
• Built-in oscillator: external resister
• Low power consumption:
• Circuits for generating LCD driving voltage :
Contrast control, Operational amplifier, and
Resistive dividers
• Internal resistive divider: programmable bias
rate
• 32-level programmable contrast control
• Wide range of instructions
reversible display, display on/off, vertical
display scroll, blink, reversible address,
read-modify-write mode
• Package: TCP
Ordering Information
Type No.
HD66421TB0
HCD66421BP
Package
TCP
Die with gold bump
1