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: TCPPinout
Specifications
| Item |
Symbol |
Ratings |
Unit |
Notes |
| Power supply Logic circuit |
Vcc |
-0.3 to +7.0 |
V |
1 |
| voltage LCD drive circuit |
VLCD |
-0.3 to +20.0 |
V |
|
| Input voltage 1 |
VT1 |
-0.3 to Vcc+0.3 |
V |
1,2 |
| Input voltage 2 |
VT2 |
-0.3 to VLCD+0.3 |
V |
1,3 |
| Operating temperature |
Topr |
-40 to +85 |
|
|
| Storage temperature |
Tstg |
-55 to +110 |
|
|
Notes: 1 .Measured relative to GND
2 Applies to pins M/S, OSC, OSC1, OSC2, DB7 to DB0, RD, WR, CS, RS, RES, CL1, M, FLM
3 Applies to pins V1O, V2O, V3O, V4O and V5O
4 If the LSI is used beyond its absolute maximum rating, it may be permanently damaged. It should always be used within the limits of its electrical characteristics to prevent malfunction or unreliability.
DescriptionThe 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.
HD66421 Data Sheet
