ST7533 Sitronix Technology, ST7533 Datasheet - Page 22

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

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ST7533
The Voltage Regulator Circuit
The step-up voltage generated at
driver voltage
Because the ST7533 chips have an internal high-accuracy
fixed voltage power supply with a 64-level electronic volume
(A) When the V5 Voltage Regulator Internal Resistors Are Used
Through the use of the V
and the electronic volume function the liquid crystal power
supply voltage V
(without adding any external resistors), making it possible to
Ver 1.0
V
Internal Rb
Internal Ra
5
[
=
=
∵ V
(
(
1
1
V5
+
+
5
EV
through the voltage regulator circuit.
can be controlled by commands alone
Rb
Rb
Ra
Ra
=
5
)
)
voltage regulator internal resistors
(
1 -
(
V
1 -
162
α
EV
VOUT
)
162
α
outputs the LCD
V
V
)
EV
REG
(constant voltage supply+electronic volume)
V
]
REG
Figure 8
22/60
function and internal resistors for the V
systems can be constructed without having to include
high-accuracy voltage regulator circuit components.
(
adjust the liquid crystal display brightness. The V
can be calculated using equation A-1 over the range where
| V
VREG
5
| < | V
thermal gradients approximate -0.15%/°C)
OUT
|.
5
voltage regulator,
2003/07/21
V
5
V
DD
voltage
5