HD66710 查看數據表（PDF） - Hitachi -> Renesas Electronics

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HD66710

Low-Power Dot-Matrix Liquid Crystal Display Controller/Driver with Key Scan Function

Hitachi -> Renesas Electronics 

HD66727

LED Output Port

The HD66727 includes three LED/back-light driving output ports and three general output ports. These

ports can control the LED from the microcomputer through the serial interface.

Booster (DC-DC Converter)

The booster doubles or triples a voltage input to the Vci pin. With this function, both the internal logic units

and LCD drivers can be controlled with a single power supply.

Oscillator (OSC)

The HD66727 can provide R-C oscillation simply by adding an external oscillation-resistor between the

OSC1 and OSC2 pins. The appropriate oscillation frequency for operating voltage, display size, and frame

frequency can be obtained by adjusting the external-resistor value. Clock pulses can also be supplied

externally. Since R-C oscillation is halted during the standby mode, current consumption can be reduced.

V-Pin Voltage Followers

A voltage follower for each voltage level (V1 to V5) reduces current consumption by the LCD drive power

supply circuit. No external resistors are required because of the internal bleeder-resistor, which generates

different levels of LCD drive voltage. The voltage followers can be turned off while multiplexing drive is

not being used.

Contrast Adjuster

The contrast adjuster can adjust LCD contrast by varying LCD drive voltage by software. This function is

suitable for selecting appropriate brightness of the LCD or for temperature compensation.

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