HM17CM4096 Datasheet, PDF (39/67 Pages) List of Unclassifed Manufacturers – 128XRGBX162 OUTPUT LCD DRIVER IC with built-in RAM

HM17CM4096
(24) REFERENCE VOLTAGE GENERATION CIRCUIT
The reference voltage generation circuit is within voltage converting circuit.
This circuit generates reference voltage V_BA terminal for using at regulator circuit through. The
output voltage level from V_BA terminal is as following description.
V_BA = V_EE x 0.9
The LCD driving voltages can be made by applying reference voltage to reference voltage input
terminal V_REF .
(25) LCD DRIVING VOLTAGE GENERATION CIRCUIT
The generation circuit of LCD driving voltage is within voltage converting circuit and generates
voltages V_LCD, V₁, V₂, V₃, V₄ by resistively dividing V_LCD into 4 levels.
The bias ratio of LCD driving voltages can be one of 1/5, 1/6, 1/7, 1/8, 1/9, 1/10, 1/11, 1/12.
When using built-in power supply circuit, you should connect voltage stabilization capacitor CA₂ at
each of LCD power terminals. There is need for selecting the coefficient of capacitor CA₂ after
display the LCD.
When using external voltage supply, disable the built-in power supply circuit(AMPON, DCON=‘00’),
supply the V_OUT, V_LCD, V₁, V₂, V₃, V₄ voltages externally and open the C₁+ , C₁- , C₂+ , C₂- , C₃+ , C₃- ,
C₄+ , C₄- , C₅+ , C₅- , C₆+ , C₆- , V_EE , V_REF , V_REG terminals.
When using external voltage source and parts of built-in voltage converting circuit, the terminals of
C₁+ , C₁- , C₂+ , C₂- , C₃+ , C₃- , C₄+ , C₄- , C₅+ , C₅- , C₆+ , C₆- should be open because boosting
circuit is not activated, you should supply reference voltage through V_REF terminal and the voltage for
voltage converting circuit at V_OUT .
Connecting stabilization capacitor CA₃ at V_REG terminal is recommended.
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