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HT82R732 Datasheet(PDF) 51 Page - Holtek Semiconductor Inc |
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HT82R732 Datasheet(HTML) 51 Page - Holtek Semiconductor Inc |
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51 / 74 page  LCD Voltage Source and Biasing The time and amplitude varying signals generated by the LCD Driver function require the generation of several voltage levels for their operation. The number of voltage levels used by the signal depends upon the value of the LCDB bit in the LCDC register. The device provides C type biasing with a value of either 1/2or1/3. For C type biasing, an external LCD voltage source can be supplied on LVB pin or LVA pin to generate the internal biasing voltages. The C type biasing scheme uses an internal charge pump circuit, which in the case of the 1/3 bias software control option can generate voltages higher than what is supplied on LVB pin. This feature is useful in applications where the microcontroller supply voltage is less than the supply voltage required by the LCD. An additional charge pump capacitor must also be connected between pins C1 and C2 to generate the necessary voltage levels. For the C type 1/2 bias selection, three voltage levels VSS, VA and VB are utilised. The voltage VA is generated internally and has a value of LVB voltage. The internal VB biasing voltage will have a value equal to LVB voltage x 0.5. For the C type 1/2 bias software control option VC is not used. For the C type 1/3 bias selection, four voltage levels VSS, VA, VB and VC are utilised. There are two LCD Power Supply input options, namely mode 1 and mode 2. In mode 1, the LCD Power Supply is supplied on the LVB pin. The voltage VA is generated internally and has a value of the LVB voltage x1.5, VB will have a value equal to the LVB voltage and VC will have a value equal to the LVB voltage x 0.5. The LVA voltage must be greater than or equal to VDD. In mode 2, the LCD Power Supply is supplied on the LVA pin. The voltage VA is generated internally and has a value of the LVA voltage. The voltage VB will have a value equal to the LVA voltage x 2/3 and VC will have a value equal to LVA voltage x 1/3. Note that the 28-pin package type only supports the LCD Power Supply mode 2 function. The following diagrams illustrate the basic LCD Bias functional block diagrams. HT82R732 e-Banking 8-Bit OTP MCU Rev. 1.00 51 October 31, 2013 C t y p e 1 / 3 B i a s - M o d e 1 L V B 0 . 1 m F 0 . 1 m F 0 . 1 m F L C D P o w e r S u p p l y C h a r g e P u m p C 1 C 2 L V A L V C C t y p e 1 / 2 B i a s - M o d e 1 L V B 0 . 1 m F 0 . 1 m F 0 . 1 m F L C D P o w e r S u p p l y C h a r g e P u m p C 1 C 2 L V A L V C V B ( = L V B ´ 0 . 5 ) V A ( = L V B ) V C ( = L V B ´ 0 . 5 ) V A ( = L V B ´ 1 . 5 ) V B ( = L V B ) C t y p e 1 / 3 B i a s - M o d e 2 L V B 0 . 1 m F 0 . 1 m F 0 . 1 m F L C D P o w e r S u p p l y C h a r g e P u m p C 1 C 2 L V A L V C V C ( = L V A ´ 1 / 3 ) V A ( = L V A ) V B ( = L V A ´ 2 / 3 ) C Type Bias Voltage Levels |
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