ST7565V Sitronix Technology, ST7565V Datasheet - Page 31

• Manufacturer Part Number: ST7565V
• Description: 65 x 132 Dot Matrix LCD Controller/Driver
• Manufacturer: Sitronix Technology

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ST7565V
The Power Supply Circuits
The power supply circuits are low-power consumption power
supply circuits that generate the voltage levels required for
the LCD drivers. They are Booster circuits, voltage regulator
circuits, and voltage follower circuits. They are only enabled
in master operation. The power supply circuits can turn the
Booster circuits, the voltage regulator circuits, and the
* The “step-up system terminals” refer CAP1+, CAP1–, CAP2+, CAP2–, and CAP3–.
* While other combinations, not shown above, are also possible, these combinations are not recommended
The Step-up Voltage Circuits
Using the step-up voltage circuits equipped within the
ST7565V chips it is possible to product a 2X,3X,4X,5X or 6X
step-up of the V
6X step-up: Connect capacitor C1 between CAP1+ and
5X step-up: Connect capacitor C1 between CAP1+ and
4X step-up: Connect capacitor C1 between CAP1+ and
Ver 1.5b
because they have no practical use.
Only the internal power supply is used
Only the voltage regulator circuit and the
Only the V/F circuit is used
Only the external power supply is used
voltage follower circuit are used
CAP1–, between CAP2+ and CAP2–, between
CAP1+ and CAP3–, between CAP2+ and
CAP4–,between CAP1+ and CAP5–, and
between V
level in the negative direction at the
t
between V
CAP1–, between CAP2+ and CAP2–, between
CAP1+ and CAP3–, between CAP2+ and
CAP4–,and between V
produce a voltage level in the negative direction
at the
level between V
CAP1–, between CAP2+ and CAP2–, between
erminal that is 6 times the voltage level
Use Settings
DD
VOUT t
– V
D2
D1
D0
bit
SS2
SS2
DD
erminal that is 5 times the voltage
and V
voltage levels.
and
DD
The Control Details of Each Bit of the Power Control Set Command
Booster circuit control bit
Voltage regulator circuit control bit (V/R circuit)
Voltage follower circuit control bit (V/F circuit)
VOU
and V
SS
2.
T, to produce a voltage
SS2
SS
and
2.
VOU
D2
1
0
0
0
T, to
VOUT
Reference Combinations
D1 D0
1
1
0
0
function
1
1
1
0
Table 7
Table 8
31/72
Voltage
booster
ON
OFF
OFF
OFF
voltage follower circuits ON or OFF independently through
the use of the Power Control Set command. Consequently,
it is possible to make an external power supply and the
internal power supply function somewhat in parallel. Table 7
shows the Power Control Set Command 3-bit data control
function, and Table 8 shows reference combinations.
3X step-up: Connect capacitor C1 between CAP1+ and
2X step-up: Connect capacitor C1 between CAP1+ and
The step-up voltage relationships are shown in Figure 7
.
Voltage
regulator
ON
ON
OFF
OFF
CAP1+ and CAP3–, and between V
VOU
direction at the
voltage level between V
CAP1–, between CAP2+ and CAP2– and
between V
CAP3– and
level in the negative direction at the
terminal that is 3 times the voltage difference
between V
CAP1–, and between V
CAP2+ open, and short between CAP2–,
CAP3– and
negative direction at the
twice the voltage between
T, to produce a voltage level in the negative
Voltage
follower
SS2
DD
ON
ON
ON
OFF
VOUT
VOUT
and V
and V
“1”
ON
ON
ON
VOUT
Status
to produce voltages
to produce a voltage in the
V
SS
OUT
terminal that is 4 times the
OUT
External
voltage
input
V5, V
V
2.
OFF
OFF
OFF
1
SS2
“0”
DD
, and short between
V
VOUT
, V
to V
SS2
VDD
and V
and V
SS2
SS2
5
terminal that Is
and V
SS
OUT
Step-up
voltage
2.
2009/09/14
Open
SS2
Open
Used
Open
SS
VOUT
, leave
2.
and