HT1625_02 Datasheet, PDF (1/15 Pages) Holtek Semiconductor Inc – RAM Mapping 64x8 LCD Controller for I/O MCU

HT1625
RAM Mapping 64´8 LCD Controller for I/O MCU
Features
· Operating voltage: 2.7V~5.2V
· Built-in RC oscillator
· External 32.768kHz crystal or 32kHz frequency
source input
· 1/4 bias, 1/8 duty, frame frequency is 64Hz
· Max. 64´8 patterns, 8 commons, 64 segments
· Built-in internal resistor type bias generator
· 3-wire serial interface
· 8 kinds of time base or WDT selection
· Time base or WDT overflow output
· Built-in LCD display RAM
· R/W address auto increment
· Two selectable buzzer frequencies (2kHz or 4kHz)
· Power down command reduces power consumption
· Software configuration feature
· Data mode and Command mode instructions
· Three data accessing modes
· VLCD pin to adjust LCD operating voltage
· Cascade application
· 100-pin QFP package
General Description
HT1625 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 512 patterns
(64´8). It also supports serial interface, buzzer sound,
Watchdog Timer or time base timer functions. The
HT1625 is a memory mapping and multi-function LCD
controller. The software configuration feature of the
HT1625 make it suitable for multiple LCD applications
including LCD modules and display subsystems. Only
three lines are required for the interface between the
host controller and the HT1625. The HT162X series
have many kinds of products that match various applica-
tions.
Selection Table
HT162X
HT1620
COM
4
SEG
32
Built-in Osc.
¾
Crystal Osc.
Ö
HT1621
4
32
Ö
Ö
HT1622
8
32
Ö
¾
HT16220
8
32
¾
Ö
HT1623
8
48
Ö
Ö
HT1625
8
64
Ö
Ö
HT1626
16
48
Ö
Ö
Block Diagram
O SCO
O SCI
CS
RD
WR
D ATA
VDD
VSS
BZ
BZ
C o n tro l
and
T im in g
C ir c u it
D is p la y R A M
L C D D r iv e r /
B ia s C ir c u it
T o n e . re q u e n c y
G e n e ra to r
W a tc h d o g T im e r
and
T im e B a s e G e n e r a to r
COM 0
COM 7
SEG 0
S E G 63
V LC D
IR Q
Rev. 1.10
1
September 11, 2002