HT1647A
64´ 16 LCD Controller for I/O MCU
PATENTED
PAT No. : TW 099352
Technical Document
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Application Note
Features
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Operating voltage: 2.7V~5.2V
Eight kinds of time base/WDT selection
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Built-in 32kHz RC oscillator
Time base or WDT overflow output
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External 32.768kHz crystal oscillator or 32kHz
frequency source input
R/W address auto increment
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Built-in buzzer driver (2kHz/4kHz)
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Standby current: <1mA at 3V, <2mA at 5V
Power down command reduces power consumption
Software configuration feature
Internal resistor type: 1/5 bias or 1/4 bias, 1/16 duty
Two selectable LCD frame frequencies: 89Hz or
170Hz
Data mode and Command mode instructions
Three data accessing modes
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Max. 64´16 patterns, 64 segments and 16 commons
Built-in bit-map display RAM: 1024 bits
(=64´16 bits)
Provides VLCD pin to adjust LCD operating voltage
Provides three kinds of bias current programming
Control of TN-type, STN-type LCDs and
ECB-type LCDs
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Built-in internal resistor type bias generator
Six-wire interface (four data wires)
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100-pin LQFP package and in chip form
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
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