HCD66764BP Просмотр технического описания (PDF) - Hitachi -> Renesas Electronics

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HCD66764BP

176-channel Common Driver for Color Displays

Hitachi -> Renesas Electronics 

Internal Block Diagram

COM1 to COM176

LCD drive circuit

176

Level shifter

176

Scan data generation circuit

Serial

interface

/register

Step-up circuit

HD66764

LCD drive-level

generation circuit

Figure 1 Block Diagram

1. Step-up circuit

Boosts the Vci1 voltage by from two to 12 times. The required voltage is generated by combining

double or triple step-up and double, triple, or quadruple step-up. The factor is controlled by register

settings. A negative-polarity voltage is also generated. For details, refer to the section on the LCD

Voltage Generation Circuit.

2. LCD-drive-level generation circuit

Generates the VCH, VSH, VM, or VCL levels required to drive the LCDs. The VSH level is

supplied to the HD66763.

3. Interface circuit

Transfers the data to the internal control register.

4. Scan data generation circuit

Produces the output signals for the common lines at logic levels, as selected and in the selected

direction, in synchronization with the FLM signal.

9

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