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HT1647 Datasheet

  • HT1647

  • 4-Level Gray Scale 64x16 LCD Controller for I/O C

  • 190.84KB

  • 24頁

  • HOLTEK

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HT1647
4-Level Gray Scale 64麓16 LCD Controller for I/O
mC
Features
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Operating voltage: 2.7V~5.2V
Built-in 32kHz RC oscillator
External 32.768kHz crystal oscillator or
32kHz frequency source input
Standby current < 1mA at 3V, < 2mA at 5V
Internal resistor type: 1/5 bias or 1/4
bias, 1/16 duty
Two selectable LCD frame frequencies:
89Hz or 170Hz
Max. 64麓16 patterns, 64 segments and 16
commons
Built-in bit-map display RAM: 2048 bits
(=64麓16麓2 bits)
Built-in internal resistor type bias generator
Six-wire interface (four data wires)
Eight kinds of time base/WDT selection
Time base or WDT overflow output
R/W address auto increment
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Built-in buzzer driver (2kHz/4kHz)
Power down command reduces power
consumption
Software configuration feature
Data mode and Command mode
instructions
Three data accessing modes
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
Four-level gray scale output for TN-type,
STN-type LCDs panel
Four-color output for ECB-type LCDs panel
Available in 100-pin QFP and in chip form
Applications
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Toys
Games
Personal digital assistant
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Cellular phone
Global positioning system
Consumer electronics
General Description
HT1647 is a peripheral device specially de-
signed for I/O type
mC
used to expand the dis-
play capability. The max. display segment of
the device are 1024 patterns (64 segments and
16 commons). It also supports four data bits in-
terface, 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 (Elec-
trically Controlled Birefringence) LCDs in ad-
dition to current TN-type (Twisted Nematic) or
STN-type (Super Twisted Nematic) LCDs, it
can support 4-color display as well as 4-level
gray scale display. It displays 4-level gray scale
o utput w hen HT1 647 d ri ve s TN -ty pe,
STN-type LCDs. It displays four color output
when HT1647 drives ECB-type. HT1647 uses
PWM (Pulse Width Modulation) technique. The
software configuration feature of the HT1647
make it suitable for multiple LCD applications
including LCD modules and display subsys-
tems. Only six lines (CS, WR, DB0~DB3) are
required for the interface between the host con-
troller and the HT1647. The HT164X series
have many kinds of products that match vari-
ous applications.
1
April 21, 2000

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