Rev. 3.0E '99.06.16
HD66420
HD66420
(RAM-Provided 160 Channel 4-Level Grey Scale
Driver for Dot Matrix Graphics LCD)
Description
The HD66420 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 HD66420 can display a maximum of
160x80 dots using its powerful display control
functions. It can display only eight lines out of
eighty lines. This function realize low
power consumption because high voltage for
driving LCD is not needed.
An MPU can access HD66420 at any time,
because the MPU operations are asynchronous
with the HD66420'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 HD66420 suitable for
small portable device applications.
Features
¥ Built-in oscillator: external resister
¥ Low power consumption:
- 55µA typ. 80µA max. during display
- 1µA typ. 5µA max. during standby
¥ 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
¥ Built-in bit-mapped display RAM: 25.6kbits
(160 x 80 x 2 bits)
¥ Grey scale display: PWM four-level grey
scale can be selected from 32 levels
¥ Grey scale memory management: Packed
pixel
¥ 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 : 15 V max.
¥ Selectable multiplex duty ratio: 1/8, 1/32,
1/64, 1/80
Ordering Information
Type No.
Package
HD66420TA0
TCP
HCD66420BP
Die with gold bump
1
