HT1622_07 Datasheet, PDF (5/13 Pages) Holtek Semiconductor Inc – RAM Mapping 32x8 LCD Controller for I/O MCU

HT1622
A.C. Characteristics
Symbol
Parameter
f_SYS1
System Clock
Test Conditions
V_DD
Conditions
3V On-chip RC oscillator
5V
f_SYS2
System Clock
3V
External clock source
5V
f_LCD1
LCD Frame Frequency
3V
On-chip RC oscillator
5V
f_LCD2
LCD Frame Frequency
3V
External clock source
5V
t_COM
LCD Common Period
¾ n: Number of COM
f_CLK1
Serial Data Clock (WR pin)
3V
Duty cycle 50%
5V
f_CLK2
Serial Data Clock (RD pin)
3V
Duty cycle 50%
5V
t_CS
Serial Interface Reset Pulse Width
(Figure 3)
¾ CS
Write mode
3V
Read mode
t_CLK
WR, RD Input Pulse Width (Figure 1)
Write mode
5V
Read mode
t_r, t_f
Rise/Fall Time Serial Data Clock Width ^3V
(Figure 1)
5V
¾
t_su
Setup Time for DATA to WR, RD Clock ^3V
Width (Figure 2)
5V
¾
t_h
Hold Time for DATA to WR, RD, Clock ^3V
Width (Figure 2)
5V
¾
t_su1
Setup Time for CS to WR, RD Clock ^3V
Width (Figure 3)
5V
¾
t_h1
Hold Time for CS to WR, RD Clock ^3V
Width (Figure 3)
5V
¾
Ta=25°C
Min. Typ. Max. Unit
22 32 40 kHz
24 32 40 kHz
¾ 32 ¾ kHz
¾ 32 ¾ kHz
44 64 80 Hz
48 64 80 Hz
¾ 64 ¾ ¾
¾ 64 ¾ ¾
¾ n/fLCD ¾ sec
¾
¾ 150 kHz
¾
¾ 300 kHz
¾
¾
75 kHz
¾
¾ 150 kHz
¾ 250 ¾ ns
3.34 ¾
6.67 ¾
1.67 ¾
3.34 ¾
¾
ms
¾
¾
ms
¾
¾ 120 ¾ ns
¾ 120 ¾ ns
¾ 120 ¾ ns
¾ 100 ¾ ns
¾ 100 ¾ ns
t_f
t_r
W R ,R D
C lo c k
90%
50%
10%
V _DD
V A L ID D A T A
V _DD
GND
DB
50%
GND
t_{C LK}
t_{C LK}
t_su
t_h
Figure 1
W R ,R D
C lo c k
V _DD
50%
GND
CS
50%
t_su1
t_{C S}
V _DD
GND
t_h1
W R ,R D
50%
V _DD
C lo c k
F IR S T
LA S T
GND
C lo c k
C lo c k
Figure 2
Figure 3
Rev. 1.40
5
February 6, 2007