HT1650
64´32 LCD Controller for I/O MCU
PATENTED
PAT No. : 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 fre-
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Six-wire interface (four data wires)
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Eight kinds of time base or 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
quency source input
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Standby current: <1mA at 3V, <2mA at 5V
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Internal resistor type: 1/6 bias or 1/5 bias, 1/32 duty,
and 1/16 duty
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Three selectable LCD frame frequencies: 64Hz,
89Hz or 170Hz
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Max. of 64´32 patterns, 64 segments and 32 com-
mons
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80 segments and 16 commons selectable by com-
and max. VLCD voltage up to 7V
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Provides three kinds of bias current programming
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Control of TN-type and STN-type LCDs
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128-pin QFP package
mand method
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Built-in bit-map display RAM: 2048 bits (=64´32 bits)
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Built-in internal resistor type bias generator
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
HT1650 is a peripheral device specially designed for I/O
type MCUs which are used to expand the display capa-
bility. The max. display segment of the device are 2048
patterns (64 segments and 32 commons). It also sup-
ports four data bits interface, buzzer sound, Watchdog
Timer or time base timer functions. The HT1650 is a
memory mapping and multi-function LCD controller. It
can control TN-type (Twisted Nematic) or STN-type
(Super Twisted Nematic) LCDs. The software configu-
ration feature of the HT1650 make it suitable for multiple
LCD applications 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 HT1650.
Rev. 1.80
1
November 9, 2010
HOLTEK [ HOLTEK SEMICONDUCTOR INC ]
