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PDF HH1621 Data sheet ( Hoja de datos )
| Número de pieza | HH1621 | |
| Descripción | 32 x 4 LCD Driver | |
| Fabricantes | Huahong | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de HH1621 (archivo pdf) en la parte inferior de esta página. Total 16 Páginas | ||
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Edited by Foxit PDF Editor
Copyright (c) by Foxit Software Company, 2004
For Evaluation Only.
HH1621
32 x 4 LCD Driver
Features
_ Operating voltage: 2.2V~5.2V
_ Built-in 256kHz RC oscillator
_ External 32.768kHz crystal or 256kHz frequency
source input
_ Selection of 1/2, 1/3 bias, and selection of 1/2, 1/3,
1/4 duty LCD applications
_ Internal time base frequency sources
_ Two selectable buzzer frequencies (2/4kHz)
_ Built-in time base generator and WDT
_ Time base or WDT overflow output
_ Power down command available
_ 8 kinds of time base/WDT clock sources
_ Built-in 32x4 bit display RAM
_ 3-wire serial interface.
_ Internal LCD driving frequency source
_ Software configuration
_ Data mode and command mode instructions
_ R/W address auto increment
_ Three data accessing modes
_ VLCD pin for adjusting LCD operating voltage
General Descriptions
The HH1621 is a 128-pattern (32x4), memory mapping, and multi-function LCD driver. The S/W configuration
feature of the HH1621 makes it suitable for multiple LCD applications including LCD modules and display
subsystems. Only three or four lines are required for the interface between the host controller and the HH1621.
The HH1621 contains a power down command to reduce power consumption.
Block Diagram
BZ
BZ
VDD
GND
CS
WR
RD
DATA
OSCI
OSCO
Tone
Generator
Control
Logic
&
Timing
Generator
Note: CS: Chip selection
BZ, BZ: Tone outputs
WR , RD, DATA: Serial interface
IRQ: Time base or WDT overflow output
COM0~COM3, SEG0~SEG31: LCD outputs
Watchdog Timer &
Time Base Generator
LCD Driver
&
Bias Circuit
Display Memory
IRQ
VLCD
COM0
COM3
SEG0
SEG31
Rev. 1.00
p. 1/1
Last update: 2007-06-27 10:06
1 page  
Edited by Foxit PDF Editor
Copyright (c) by Foxit Software Company, 2004
For Evaluation Only.
HH1621
32 x 4 LCD Driver
D.C. Characteristics
Symbol
Parameter
Test Conditions
VDD Conditions
VDD Operating Voltage
IDD1 Operating Current
——
3V No load/LCD ON
5V On-chip RC oscillator
IDD2 Operating Current
3V No load/LCD ON
5V Crystal oscillator
IDD3 Operating Current
3V No load/LCD ON
5V External clock source
ISTB Standby Current
3V No load
5V Power down mode
VIL Input Low Voltage
3V
5V
DATA, WR, CS, RD
VIH Input High Voltage
3V
5V
DATA, WR, CS, RD
IOL1 DATA, BZ, BZ, IRQ
3V VOL=0.3V
5V VOL=0.5V
IOH1 DATA, BZ, BZ
3V VOH=2.7V
5V VOH=4.5 V
IOL2 LCD Common Sink Current
3V VOL=0.3V
5V VOL=0.5V
IOH2
LCD Common Source Current 3V VOH=2.7V
5V VOH=4.5 V
IOL3 LCD Segment Sink Current
3V VOL=0.3V
5V VOL=0.5V
IOH3
LCD Segment Source Current
3V VOH=2.7V
5V VOH=4.5 V
RPH Pull-high Resistor
3V
5V
DATA, WR, CS, RD
Min.
2.4
—
—
—
—
—
—
—
—
0
0
2.4
4.0
0.5
1.3
-0.4
-0.9
80
150
-80
-120
60
120
-40
-70
40
30
Typ.
—
150
350
150
225
150
275
0.1
0.3
—
—
—
—
1.2
2.6
-0.8
-1.8
150
250
-120
-200
120
200
-70
-100
80
60
Max.
5.2
325
725
250
475
275
500
5
10
0.6
1.0
3.0
5.0
—
—
—
—
—
—
—
—
—
—
—
—
150
100
Unit
V
µA
µA
µA
µA
µA
µA
µA
µA
V
V
V
V
mA
mA
mA
mA
µA
µA
µA
µA
µA
µA
µA
µA
kΩ
kΩ
5
June 2007
5 Page 
Edited by Foxit PDF Editor
Copyright (c) by Foxit Software Company, 2004
For Evaluation Only.
HH1621
32 x 4 LCD Driver
Timing Diagrams
READ mode (command code: 1 1 0 )
CS
WR
RD
DATA
1 1 0 A5 A4 A3 A2 A1 A0 D0 D1 D2 D3
Memory Address 1 (MA1) Data (MA1)
1 1 0 A5 A4 A3 A2 A1 A0 D0 D1 D2 D3
Memory Address 2 (MA2) Data (MA2)
READ mode (successive address reading)
CS
WR
RD
DATA
1 1 0 A5 A4 A3 A2 A1 A0 D0 D1 D2 D3 D0 D1 D2 D3 D0 D1 D2 D3 D0 D1 D2 D3 D0
Memory Address (MA) Data (MA)
Data (MA+1) Data (MA+2) Data (MA+3)
WRITE mode (command code: 1 0 1 )
CS
WR
DATA
1 0 1 A5 A4 A3 A2 A1 A0 D0 D1 D2 D3
Memory Address 1 (MA1) Data (MA1)
1 0 1 A5 A4 A3 A2 A1 A0 D0 D1 D2 D3
Memory Address 2 (MA2) Data (MA2)
WRITE mode (successive address writing)
CS
WR
DATA
1 0 1 A5 A4 A3 A2 A1 A0 D0 D1 D2 D3 D0 D1 D2 D3 D0 D1 D2 D3 D0 D1 D2 D3 D0
Memory Address (MA) Data (MA)
Data (MA+1) Data (MA+2) Data (MA+3)
11
June 2007
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet HH1621.PDF ] | |
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