HT1647 Datasheet, PDF (1/24 Pages) Holtek Semiconductor Inc – 4-Level Gray Scale 64x16 LCD Controller for I/O C

HT1647
4-Level Gray Scale 64´16 LCD Controller for I/O mC
Features
· 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´16 patterns, 64 segments and 16
commons
· Built-in bit-map display RAM: 2048 bits
(=64´16´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
Applications
· Toys
· Games
· Personal digital assistant
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
· 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
· Cellular phone
· Global positioning system
· Consumer electronics
gray scale display. It displays 4-level gray scale
output when HT1647 drives TN-type,
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.
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April 21, 2000