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PDF HD66705U Data sheet ( Hoja de datos )
| Número de pieza | HD66705U | |
| Descripción | Low-Power Dot-Matrix Liquid Crystal Display Controller/Driver | |
| Fabricantes | Hitachi Semiconductor | |
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HD66705U
(Low-Power Dot-Matrix Liquid Crystal Display Controller/Driver)
ADE-207-305(Z)
'99.9
Rev. 0.0
Description
The HD66705U dot-matrix liquid crystal display controller and driver LSI displays alphanumerics,
katakana, hiragana, and symbols. It can be configured to drive a dot-matrix liquid crystal display under the
control of a clock-synchronized serial, or a 4- or 8-bit microprocessor. A single HD66705U is capable of
displaying a maximum of two 12-character lines, 40 segments, and 10 annunciators. The HD66705U
incorporates all the functions required for driving a dot-matrix liquid crystal display such as display RAM,
character generator, and liquid crystal drivers, and a booster for LCD power supply.
The HD66705U provides various functions to reduce the power consumption of an LCD system such as
low-voltage operation of 2.4V or less, a booster for generating a maximum of triple LCD drive voltage
from the supplied voltage, and voltage-followers for decreasing the direct current flow in the LCD drive
bleeder-resistors. Combining these hardware functions with software functions such as standby and sleep
modes allows a fine power control. The HD66705U, with the above functions, is suitable for any portable
battery-driven product requiring long-term driving capabilities and small size.
Features
• 5 × 8-dot matrix LCD drive
• Two 12-character lines, 40 segments, and 10 annunciators
• Low-power operation support:
2.4 to 5.5V (low voltage)
Double or triple booster for liquid crystal drive voltage
Electron volume function and voltage-followers for decreasing the direct current flow in the LCD
drive bleeder-resistors
Standby mode and sleep mode
Displays up to 10 static annunciators without LCD power supply
• Clock-synchronized serial interface; 4- or 8-bit parallel bus interface
• 60 × 8-bit display data RAM (60 characters max)
• 9,600-bit character generator ROM
1
1 page  
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HD66705U Block Diagram
HD66705U
OSC1 OSC2 SFT EXM AGND
CPG
RESET*
TEST
IM1/0
RS/CS*
E/SCL
RW/SDA
DB7–DB6
DB5/ID5
–DB0/ID0
System
interface
• Clock-
synchro-
nized
serial
• 4 bits
• 8 bits
Input/
output
buffer
Instruction
register
(IR)
Instruction
decoder
8
7
Address
counter
7
8 Data
register
(DR)
Busy
flag
5
3
8
75
Timing generator
7
Display data RAM
(DDRAM)
60 × 8 bits
ASEG1–
ASEG10
Annunciator
driver
ACOM
COM1–
COM16
18-bit Common
shift signal
register driver
COMS1/2
8
60-bit 60-bit
shift latch
register circuit
SEG1–
Segment SEG60
signal
driver
8
Vci
C1
C2
V5OUT2
V5OUT3
Booster
Segment
RAM
(SEGRAM)
8 bytes
Character
generator
RAM
(CGRAM )
32 bytes
Character
generator
ROM
(CGROM)
9,600 bits
Cursor and
blink
controller
5
5
Parallel/serial converter
LCD drive
voltage
selector
VCC
GND
+–
R
+–
R
+–
R
+–
R
+–
R
VR
OPOFF
V1OUT
V2OUT
V3OUT
V2 V3
V4OUT V5OUT
VEE
5
5 Page 
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Table 1 Pin Functional Description (cont)
HD66705U
Signal
Vci
V5OUT2
V5OUT3
Number
of Pins I/O
2I
2O
2O
Device
Interfaced with Function
Power supply
Inputs a reference voltage and supplies power to the
booster; generates the liquid crystal display drive voltage
from the operating voltage.
VEE pin/ Booster Voltage input to the Vci pin is boosted twice and output.
capacitance When the voltage is boosted three times, the same
capacitance as that of C1–C2 should be connected here.
VEE pin
Voltage input to the Vci pin is boosted three times and
output.
C1/C2
6
RESET* 1
EXM
1
SFT 1
OPOFF 1
TEST
1
— Booster
capacitance
I—
I MPU
I VCC or GND
I VCC or GND
I GND
External capacitance should be connected here when using
the booster.
Reset pin. Initializes the LSI when low. Must reset after
power-on.
External alternating signal used for annunciator display
during standby mode. If annunciator display is not used,
EXM must be fixed to VCC or GND.
Selects the SEG output pin arrangement: when SFT =
GND, SEG1 is connected to the far left of the LCD panel
and when SFT = VCC, SEG60 is connected to the far left of
the LCD panel
Turns the internal operational amplifier off when OPOFF =
VCC, and turns it on when OPOFF = GND. If the amplifier is
turned off (OPOFF = VCC), V1 to V5 must be supplied to the
V1OUT to V5OUT pins.
Test pin. Must be grounded.
11
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| Páginas | Total 70 Páginas | |
| PDF Descargar | [ Datasheet HD66705U.PDF ] | |
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