HT1647A
64´16 LCD Controller for I/O MCU
PATENTED
PAT No. : TW 099352
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
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Eight kinds of time base/WDT selection
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Time base or WDT overflow output
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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
frequency 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: 1024 bits
(=64´16 bits)
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Built-in internal resistor type bias generator
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Six-wire interface (four data wires)
ECB-type LCDs
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100-pin LQFP 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
HT1647A 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 HT1647A is a memory
mapping and multi-function LCD controller. Since the
HT1647A can control ECB-type (Electrically Controlled
Birefringence) LCDs in addition to current TN-type
(Twisted Nematic) or STN-type (Super Twisted Ne-
matic) LCDs. The software configuration feature of the
HT1647A make it suitable for multiple LCD applications
including LCD modules and display subsystems. Only
six lines (CS, WR, DB0~DB3) are required for the inter-
face between the host controller and the HT1647A.
Rev. 1.40
1
April 29, 2011
HOLTEK [ HOLTEK SEMICONDUCTOR INC ]
