HT1647
4-Level Gray Scale 64´ 16 LCD Controller for I/O MCU
PATENTED
PAT No. : 099352
Technical Document
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Tools Information
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FAQs
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Application Note
Features
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Operating voltage: 2.7V~5.2V
R/W address auto increment
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Built-in 32kHz RC oscillator
Built-in buzzer driver (2kHz/4kHz)
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External 32.768kHz crystal oscillator or 32kHz fre-
Power down command reduces power consumption
Software configuration feature
quency source input
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Standby current: < 1mA at 3V, < 2mA at 5V
Data mode and Command mode instructions
Three data accessing modes
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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
Provides VLCD pin to adjust LCD operating voltage
Provides three kinds of bias current programming
170Hz
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Max. 64´16 patterns, 64 segments and 16 commons
Control of TN-type, STN-type LCDs and ECB-type
LCDs
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Built-in bit-map display RAM: 2048 bits (=64´16´2
bits)
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Four-level gray scale output for TN-type, STN-type
LCDs panel
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Built-in internal resistor type bias generator
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Four-color output for ECB-type LCDs panel
100-pin QFP package and in chip form
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
Applications
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Leisure products
Cellular phone
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Games
Global positioning system
Consumer electronics
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Personal digital assistant
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. 1.40
1
November 9, 2010