ST7565 查看數據表（PDF） - Unspecified
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ST7565 Datasheet PDF : 56 Pages
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ST7565
VSS2
C1
VOUT
VSS2
C1
VOUT
VSS2
C1
VOUT
CAP3-
CAP3-
CAP3-
C1
CAP1+
CAP1+
CAP1+
C1
C1
C1
CAP1-
CAP1-
CAP1-
CAP2-
CAP2-
C1
C1
CAP2+
CAP2+
OPEN
CAP2-
CAP2+
4x step-up voltage circuit
3x step-up voltage circuit
2x step-up voltage circuit
VDD=0V
VSS2=-3V
VOUT=4xVSS2=-12V
4x step-up voltage relationships
VDD=0V
VSS2=-3V
VOUT=3xVSS2=-9V
3x step-up voltage relationships
VDD=0V
VSS2=-5V
VOUT=3xVSS2=-10V
2x step-up voltage relationships
Figure 7
* The VSS2 voltage range must be set so that the VOUT terminal voltage does not exceed the absolute maximum rated value.
The Voltage Regulator Circuit
The step-up voltage generated at VOUT outputs the LCD
driver voltage V5 through the voltage regulator circuit.
Because the ST7565 chips have an internal high-accuracy
fixed voltage power supply with a 64-level electronic volume
function and internal resistors for the V5 voltage regulator,
systems can be constructed without having to include
high-accuracy voltage regulator circuit components.
Moreover, in the ST7565, Two types of thermal gradients
have been prepared as VREG options: (1) approximately
-0.15%/°C (2) external input (supplied to the VRS terminal)
(A) When the V5 Voltage Regulator Internal Resistors Are Used
Through the use of the V5 voltage regulator internal resistors
and the electronic volume function the liquid crystal power
supply voltage V5 can be controlled by commands alone
(without adding any external resistors), making it possible to
adjust the liquid crystal display brightness. The V5 voltage
can be calculated using equation A-1 over the range where
| V5 | < | VOUT |.
Ver 1.0a
21/56
2002/06/24
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