EM65567AF datasheet(34/93 Pages) EMC

34 / 93 page

Preliminary

EM65567

66 COM/ 96 SEG 256 Color STN LCD Driver

* This specification is subject to be changed without notice.

2003/1/9 (V0.1)

FLM

COM0

COM1

SEG0

SEG1

7.19 LCD Drive Circuit

This drive circuit generates four levels LCD drive voltage. The circuit has 288 segment outputs and 66 common outputs and

outputs combined display data and M signal. Two of common outputs, COMA and COMB, are special outputs. The COMA

and COMB outputs be not influenced by partial setting. Mainly use for display. The common drive circuit that has shift

7.20 Oscillating Circuit

The EM65567 has the CR oscillator. The output from this oscillator is used as the timing signal source of the display and the

boosting clock to the booster.

This can use only in the master operation mode.

When in the master operation mode and external clock is used, feed the clock to CK pin.

The duty cycle of the external clock must be 50%.

The resistance ratio of CR oscillator is programmable. If change this ratio, also change frame frequency for display.

7.21 Power Supply Circuit

This circuit supplies voltages necessary to drive a LCD. The circuit consists of booster and voltage converter.

Boosted voltage from the booster is fed to the voltage converter that converts this input voltage into V0, V1, V2, V3 and V4

that are used to drive the LCD. This internal power supply should not be used to drive a large LCD panel containing many

EM65567AF Datasheet(PDF) 34 Page - ELAN Microelectronics Corp