ST7533 Sitronix Technology, ST7533 Datasheet - Page 27

• Manufacturer Part Number: ST7533
• Description: 33 x 96 Dot Matrix LCD Controller/Driver
• Manufacturer: Sitronix Technology

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ST7533
* When the V
* The V
* Because the input impedance of the
The LCD Voltage Generator Circuit
The V
within the IC, and can be produced at the V
voltage levels required for liquid crystal driving. Moreover,
High Power Mode
The power supply circuit equipped in the ST7533 chips has
very low power consumption (normal mode: HPM = “H”).
However, for LCDs or panels with large loads, this low-power
power supply may cause display quality to degrade. When
this occurs, setting the HPM terminal to “L” (high power mode)
can improve the quality of the display. We recommend that
The Internal Power Supply Shutdown Command Sequence
The sequence shown in Figure 13 is recommended for
shutting down the internal power supply, first placing the
The temperature grade of the Internal Power Supply for ST7533 (-0.15%/°C) :
Ver 1.0
voltage regulator circuit and the voltage follower circuit to an operating mode using the power control set commands.
Moreover, it is necessary to provide a voltage from V
is left open.
cables, etc. to handle noise.
When the V
5
V5
voltage is produced by a resistive voltage divider
R
terminal is enabled only when the V
7.60V
9.40V
8.46V
5
voltage regulator internal resistors or the electronic volume function is used, it is necessary to at least set the
5
0V
voltage regulator internal resistors are used (i.e. when the IRS terminal = “H”), then the V
-40
°C
Sequence
-20
Step1
Step2
End
°C
VR
1
, V
terminal is high, it is necessary to take into consideration short leads, shield
Internal power supply OFF
5
2
, V
Display all points ON
voltage regulator internal resistors are not used (i.e. the IRS terminal = “L”).
0
Ta=-40°C , V5=9.40V
°C
(Command, status)
3
, and V
Display OFF
Details
OUT
Figure 14
Figure 13
4
when the Booster circuit is OFF.
25
27/60
°C
when the voltage follower changes the impedance, it
provides V
the display be checked on actual equipment to determine
whether or not to use this mode. Moreover, if the
improvement to the display is inadequate even after high
power mode has been set, then it is necessary to add a liquid
c r y s t a l
externally.
power supply in power saver mode and then turning
the power supply OFF.
Ta=25°C , V5=8.46V
D7 D6 D5 D4 D3 D2 D1 D0
1
1
50
Command address
1
0 1
0 1
°C
, V
2
, V
0 0
0 1
d r i v e
3
and V
85
1 1
1 0
°C
4
Ta=85°C , V5=7.60V
to the liquid crystal drive circuit.
0
1
p o w e r
Ta
Power saver
commands
(compound)
s u p p l y
2003/07/21
R
terminal