HT1647
4-Level Gray Scale 64´16 LCD Controller for I/O MCU
Technical Document
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Features
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Operating voltage: 2.7V~5.2V
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Built-in 32kHz RC oscillator
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External 32.768kHz crystal oscillator or 32kHz fre-
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R/W address auto increment
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Built-in buzzer driver (2kHz/4kHz)
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Power down command reduces power consumption
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Software configuration feature
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Data mode and Command mode instructions
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Three data accessing modes
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Provides VLCD pin to adjust LCD operating voltage
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Provides three kinds of bias current programming
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Control of TN-type, STN-type LCDs and ECB-type
quency source input
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Standby current: < 1mA at 3V, < 2mA at 5V
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Internal resistor type: 1/5 bias or 1/4 bias, 1/16 duty
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Two selectable LCD frame frequencies: 89Hz or
170Hz
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Max. 64´16 patterns, 64 segments and 16 commons
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Built-in bit-map display RAM: 2048 bits (=64´16´2
LCDs
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Four-level gray scale output for TN-type, STN-type
bits)
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Built-in internal resistor type bias generator
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Six-wire interface (four data wires)
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Eight kinds of time base/WDT selection
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Time base or WDT overflow output
LCDs panel
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Four-color output for ECB-type LCDs panel
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100-pin QFP package and in chip form
Applications
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Leisure products
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Games
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Personal digital assistant
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Cellular phone
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Global positioning system
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Consumer electronics
General Description
HT1647 is a peripheral device specially designed for I/O
type MCU used to expand the display capability. The
max. display segment of the device are 1024 patterns
(64 segments and 16 commons). It also supports four
data bits interface, buzzer sound, Watchdog Timer or
time base timer functions. The HT1647 is a memory
mapping and multi-function LCD controller. Since the
HT1647 can control ECB-type (Electrically Controlled
Birefringence) LCDs in addition to current TN-type
(Twisted Nematic) or STN-type (Super Twisted Ne-
matic) LCDs, it can support 4-color display as well as
4-level gray scale display. It displays 4-level gray scale
output when the HT1647 drives a TN-type, STN-type
LCDs. It displays four color output when the HT1647
drives an ECB-type. HT1647 uses PWM (Pulse Width
Modulation) technique. The software configuration fea-
ture of the HT1647 make it suitable for multiple LCD ap-
plications including LCD modules and display
subsystems. Only six lines (CS, WR, DB0~DB3) are re-
quired for the interface between the host controller and
the HT1647.
Rev. 1.30
1
November 10, 2005
HOLTEK [ HOLTEK SEMICONDUCTOR INC ]
