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ML9058E Fiches technique(PDF) 32 Page - List of Unclassifed Manufacturers

No de pièce ML9058E
Description  132-Channel LCD Driver with Built-in RAM for LCD Dot Matrix Displays
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Fabricant  ETC2 [List of Unclassifed Manufacturers]
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ML9058E Fiches technique(HTML) 32 Page - List of Unclassifed Manufacturers

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FEDL9058E-01
LAPIS Semiconductor
ML9058E
32/76
The voltage relationships in voltage multiplication are shown in Fig. 8.
VOUT = 3  VIN
= 15.0 V
*1 VIN
= 5.0 V
VSS
= 0 V
VOUT = 4  VIN
= 18 V
*1 VIN = 4.5 V
VSS = 0 V
Voltage relationship in 3-time multiplication
Voltage relationship in 4-time multiplication
Fig. 8 Voltage relationships in voltage multiplication
*1:
The voltage range of VIN should be set from 6V to 18.33V so that the voltage at the pin VOUT does
not exceed the voltage multiplier output voltage operating range.
Voltage adjustment circuit
The voltage multiplier output VOUT produces the LCD drive voltage V1 via the voltage adjustment circuit. Since
the ML9058E incorporates a high accuracy constant voltage generator, a 64-level electronic potentiometer
function, and also resistors for voltage V1 adjustment, it is possible to build a high accuracy voltage adjustment
circuit with very few components. In addition, the ML9058E is available with the temperature gradients of a
VREG - about –0.05%/°C.
(a) When the internal resistors for voltage V1 adjustment are used
It is possible to control the LCD power supply voltage V1 and adjust the intensity of LCD display using
commands and without needing any external resistors, if the internal voltage V1 adjustment resistors and the
electronic potentiometer function are used. The voltage V1 can be obtained by the following equation A-1 in
the range of V1<VOUT.
V1 = (1 + (Rb/Ra))
 VEV = (1 + (Rb/Ra))  (1 – (/324))  VREG (Eqn. A-1)
Fig. 9 V1 voltage adjustment circuit (equivalent circuit)
+
V1
Internal Ra
Internal Rb
VEV (Constant voltage supply +
electronic potentiometer)
VRS
(VREG)
VR


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