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HT1647 -- 4-Level Gray Scale 64x16 LCD
Controller for I/O MCU |
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| 概要 |
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HT1647 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
HT1647 is a memory mapping and multi-function LCD
controller. Since the HT1647 can control ECB-type
(Electrically Controlled Birefringence) LCDs in
addition 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 output
when the HT1647 drives a TN-type, STN-type LCDs. It
displays four color output when the HT1647 drives an
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
subsystems. Only six lines (CS, WR, DB0~DB3) are
required for the interface between the host
controller and the HT1647. |
| 特点 |
Operating voltage: 2.7V~5.2V
Built-in 32kHz RC oscillator
External 32.768kHz crystal oscillator or 32kHz
frequency source input
Standby current: <1uA at 3V, <2uA at 5V
Internal resistor type: 1/5 bias or
1/4 bias, 1/16 duty
Two selectable LCD frame
frequencies: 89Hz or 170Hz
Max. 64x16 patterns, 64 segments and 16 commons
Built-in bit-map display RAM: 2048 bits (=64x16x2
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
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
100-pin QFP and in chip form
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