ST7565 データシートの表示（PDF） - Unspecified
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ST7565 Datasheet PDF : 56 Pages
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ST7565
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
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.
Table 7
bit
function
Status
“1” “0”
D2
Booster circuit control bit
D1
Voltage regulator circuit control bit (V/R circuit)
D0
Voltage follower circuit control bit (V/F circuit)
ON OFF
ON OFF
ON OFF
The Control Details of Each Bit of the Power Control Set Command
Use Settings
Table 8
D2
D1 D0
Voltage Voltage Voltage
booster regulator follower
External
voltage
input
Step-up
voltage
Only the internal power supply is used 1
Only the voltage regulator circuit and the
voltage follower circuit are used
0
Only the V/F circuit is used
0
11
11
01
ON
OFF
OFF
ON
ON
OFF
ON
VSS2
Used
ON VOUT, VSS2 Open
ON
V5, VSS2 Open
Only the external power supply is used
0 0 0 OFF
OFF
Reference Combinations
OFF
V1 to V5
Open
* 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
because they have no practical use.
The Step-up Voltage Circuits
Using the step-up voltage circuits equipped within the
ST7565 chips it is possible to product a Quad step-up, a
Triple step-up, and a Double step-up of the VDD – VSS2
voltage levels.
Quad step-up: Connect capacitor C1 between CAP1+ and
CAP1–, between CAP2+ and CAP2–,
between CAP1+ and CAP3–, and between
VSS2 and VOUT, to produce a voltage level in
the negative direction at the VOUT terminal
that is 4 times the voltage level between VDD
and VSS2.
Triple step-up: Connect capacitor C1 between CAP1+ and
CAP1–, between CAP2+ and CAP2– and
between VSS2 and VOUT, and short between
CAP3– and VOUT to produce avoltage level
in the negative direction at the VOUT terminal
that is 3 times the voltage difference
between VDD and VSS2.
Double step-up: Connect capacitor C1 between CAP1+ and
CAP1–, and between VSS2 and VOUT, leave
CAP2+ open, and short between CAP2–,
CAP3– and VOUT to produce a voltage in the
negative direction at the VOUT terminal that
Is twice the voltage between VDD and VSS2.
The step-up voltage relationships are shown in Figure 7.
Ver 1.0a
20/56
2002/06/24
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