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PDF HT1650 Data sheet ( Hoja de datos )
| Número de pieza | HT1650 | |
| Descripción | 64x32 LCD Controller | |
| Fabricantes | Holtek Semiconductor | |
| Logotipo |  |
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DataSheet.in
HT1650
64´32 LCD Controller for I/O MCU
Technical Document
· FAQs
· Application Note
Features
· Operating voltage: 2.7V~5.2V
· Built-in 32kHz RC oscillator
· External 32.768kHz crystal oscillator or 32kHz fre-
quency source input
· Standby current: <1mA at 3V, <2mA at 5V
· Internal resistor type: 1/6 bias or 1/5 bias, 1/32 duty,
and 1/16 duty
· Three selectable LCD frame frequencies: 64Hz,
89Hz or 170Hz
· Max. of 64´32 patterns, 64 segments and 32 com-
mons
· 80 segments and 16 commons selectable by com-
mand method
· Built-in bit-map display RAM: 2048 bits (=64´32 bits)
· Built-in internal resistor type bias generator
· Six-wire interface (four data wires)
· Eight kinds of time base or 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
and max. VLCD voltage up to 7V
· Provides three kinds of bias current programming
· Control of TN-type and STN-type LCDs
· 128-pin QFP package
Applications
· Leisure products
· Games
· Personal digital assistant
· Cellular phone
· Global positioning system
· 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. 1.20
1 November 10, 2005
1 page  
DataSheet.in
HT1650
Absolute Maximum Ratings
Supply Voltage ...........................VSS-0.3V to VSS+5.5V
Input Voltage.............................VSS-0.3V to VDD+0.3V
Storage Temperature ............................-50°C to 125°C
Operating Temperature...........................-25°C to 75°C
Note: These are stress ratings only. Stresses exceeding the range specified under ²Absolute Maximum Ratings² may
cause substantial damage to the device. Functional operation of this device at other conditions beyond those
listed in the specification is not implied and prolonged exposure to extreme conditions may affect device reliabil-
ity.
D.C. Characteristics
Symbol
Parameter
VDD Operating Voltage
IDD1 Operating Current
IDD2 Operating Current
IDD11
Operating Current
IDD22
Operating Current
ISTB Standby Current
VIL Input Low Voltage
VIH Input High Voltage
IOL1 BZ, BZ, IRQ Sink Current
IOH1 BZ, BZ Source Current
IOL2 DB0~DB3 Sink Current
IOH2 DB0~DB3 Source Current
IOL3 LCD Common Sink Current
IOH3 LCD Common Source Current
IOL4 LCD Segment Sink Current
IOH4 LCD Segment Source Current
RPH Pull-high Resistor
Ta=25°C
Test Conditions
VDD Conditions
¾¾
3V No load/LCD ON
5V On-chip RC oscillator
3V No load/LCD ON
5V Crystal oscillator
3V No load/LCD OFF
5V On-chip RC oscillator
3V No load/LCD OFF
5V Crystal oscillator
3V
No load, Power down mode
5V
3V
DB0~DB3, WR, CS, RD
5V
3V
DB0~DB3, WR, CS, RD
5V
3V VOL=0.3V
5V VOL=0.5V
3V VOH=2.7V
5V VOH=4.5V
3V VOL=0.3V
5V VOL=0.5V
3V VOH=2.7V
5V VOH=4.5V
3V VOL=0.3V
5V VOL=0.5V
3V VOH=2.7V
5V VOH=4.5V
3V VOL=0.3V
5V VOL=0.5V
3V VOH=2.7V
5V VOH=4.5V
3V
DB0~DB3, WR, CS, RD
5V
Min.
2.7
¾
¾
¾
¾
¾
¾
¾
¾
¾
¾
0
0
2.4
4.0
1.2
3
-0.9
-2
1.2
3
-0.9
-2
80
180
-40
-90
50
120
-30
-70
150
60
Typ.
¾
150
250
135
200
15
50
2
3
¾
¾
¾
¾
¾
¾
2.5
6
-1.8
-4
2.5
6
-1.8
-4
160
360
-80
-180
100
240
-60
-140
250
125
Max.
5.2
250
370
200
300
30
70
10
10
1
2
0.6
1.0
3
5
¾
¾
¾
¾
¾
¾
¾
¾
¾
¾
¾
¾
¾
¾
¾
¾
410
210
Unit
V
mA
mA
mA
mA
mA
mA
mA
mA
mA
mA
V
V
V
V
mA
mA
mA
mA
mA
mA
mA
mA
mA
mA
mA
mA
mA
mA
mA
mA
kW
kW
Rev. 1.20
5 November 10, 2005
5 Page 
DataSheet.in
HT1650
Bias Generator
The HT1650 bias voltage belongs to the internal resistor
type. It provides two kinds of bias options, namely 1/6
bias and 1/5 bias respectively. It also provides three
kinds of bias current options by programming to suitably
drive an LCD panel. The three kinds of bias current are
large, middle, and small, respectively. Usually, large
panel LCD can be excellently displayed by large bias
current. Relatively, it consumes large current when LCD
ON command is used. Small bias current provides low
power consumption during on condition when the LCD
is normally displayed. The following are the reference
value table.
When the bias current for LCD is more than Large Bias
Current setting. It is recommended to add external cir-
cuit to increase driving current.
Interfacing
Only six lines are required to interface with the HT1650.
The CS line is used to initialize the serial interface circuit
and to terminate the communication between the host
controller and the HT1650. If the CS pin is set to 1, the
data and command issued between the host controller
and the HT1650 are first disabled and then initialized.
Before issuing a mode command or mode switching, a
high level pulse is required to initialize the serial inter-
face of the HT1650. The DB0~DB3 are the 4-bit parallel
data input/output lines. Data to be read or written or
commands to be written have to pass through the
DB0~DB3 lines. The RD line is the READ clock input.
Data in the RAM are clocked out on the falling edge of the
RD signal, and the clocked out data will then appear on
the DB0~DB3 lines. It is recommended that the host
controller read correct data during the interval between
the rising edge and the next falling edge of the RD signal.
The WR line is the WRITE clock input. The data, ad-
dress, and command on the DB0~DB3 lines are all
clocked into the HT1650 on the rising edge of the WR
signal. There is an optional IRQ line to be used as an in-
terface between the host controller and the HT1650.
The IRQ pin can be selected as a timer output or a WDT
overflow flag output by the S/W setting. The host con-
troller can perform the time base or the WDT function by
connecting with the IRQ pin of the HT1650.
Bias VLCD
Large Bias Current
Middle Bias Current
Small Bias Current
3V
1/5
5V
165mA
270mA
70mA
110mA
30mA
50mA
3V
1/6
5V
140mA
225mA
55mA
90mA
25mA
40mA
P ow er
P ow er
V LC D
(T 1 ) V 1
(T 2 ) V 2
V3
V4
(T 3 ) V 5
(T 4 ) V 6
R
R
R
R
R
R
R
VSS
1 /5 B ia s
VR
V LC D
V LC D
(T 1 ) V 1
(T 2 ) V 2
V3
V4
(T 3 ) V 5
(T 4 ) V 6
R
R
R
R
R
R
R
VSS
1 /6 B ia s
VR
V LC D
Internal Resistor Type Bias Generator Configurations
Note: The voltage applied to VLCD pin must be lower than 7V
Adjust VR to fit LCD display
Rev. 1.20
11 November 10, 2005
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet HT1650.PDF ] | |
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