參數(shù)資料
型號(hào)： EM65567
英文描述： Synchronous Rectified MOSFET Driver; Temperature Range: 0&degC to 70°C; Package: 8-QFN
中文描述： 平面彩色STN液晶顯示器驅(qū)動(dòng)器，內(nèi)置內(nèi)存
文件頁(yè)數(shù)： 9/43頁(yè)
文件大小： 291K
代理商： EM65567
65 COM/ 132SEG Dot Matrix LCD Driver
17
EM65565A
The Power Supply Circuits
The power supply circuits are low-power consumption power supply circuits that generate
the voltage levels required for liquid crystal drivers. They comprise Booster (step-up voltage)
circuits, Voltage regulator circuits, and voltage follower circuits. They are only enabled in
master operation.
The power supply circuit can turn the Booster circuits, the voltage regulator circuits and
the voltage follower circuit 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.
The Step-up Voltage Circuit:
Using the step-up voltage circuit equipped within the EM65565A chip it is possible to
product a five times step-up, a four times step-up, and a three times, and a two times step-up
of the VCI voltage levels. The step-up voltage relationships are shown in Figure 8.
VCI
VSS
VOUT
CAP4+
CAP3+
CAP1-
CAP1+
CAP2+
CAP2-
-
C
+
-
C
+
VDD
VCI
VOUT=2*VCI
VCI
VSS
VOUT
CAP4+
CAP3+
CAP1-
CAP1+
CAP2+
CAP2-
-
C
+
-
C
+
VDD
VCI
+
C
-
VOUT=3*VCI
VCI
VSS
VOUT
CAP4+
CAP3+
CAP1-
CAP1+
CAP2+
CAP2-
-
C
+
-
C
+
VDD
VCI
+
C
-
+
C
-
VOUT=4*VCI
VCI
VSS
VOUT
CAP4+
CAP3+
CAP1-
CAP1+
CAP2+
CAP2-
-
C
+
-
C
+
VDD
VCI
+
C
-
+
C
-
+
C
-
VOUT=5*VCI
Fig. 8
The Voltage Regulator Circuit
The step-up voltage generated at VOUT output the LCD driver voltage V0 through the
voltage regulator circuit.
Because the EM65565A chip has an internal high-accuracy fixed voltage power supply
with a 64-level electronic volume function and internal resistors for the V0 voltage regulator,
systems can be constructed without having to include high-accuracy voltage regulator circuit
components. Moreover, in the EM65565A, types of thermal gradients have been prepared as
VREG options: Approximately –0.05%/
°C, -0.2%/°C and external input (from VRS pin)
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EM65567AF 制造商:EMC 制造商全稱:ELAN Microelectronics Corp 功能描述:66 COM/ 96 SEG 256 Color STN LCD Driver
EM65567AGH 制造商:EMC 制造商全稱:ELAN Microelectronics Corp 功能描述:66 COM/ 96 SEG 256 Color STN LCD Driver
EM65568 制造商:EMC 制造商全稱:ELAN Microelectronics Corp 功能描述:130 COM/ 128 SEG 4096 Color STN LCD Driver
EM65568AF 制造商:EMC 制造商全稱:ELAN Microelectronics Corp 功能描述:130 COM/ 128 SEG 4096 Color STN LCD Driver
EM65568AGH 制造商:EMC 制造商全稱:ELAN Microelectronics Corp 功能描述:130 COM/ 128 SEG 4096 Color STN LCD Driver
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