em65567 ELAN Microelectronics Corp, em65567 Datasheet - Page 34

• Manufacturer Part Number: em65567
• Description: Com/ Color Driver
• Manufacturer: ELAN Microelectronics Corp

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
register sequentially outputs common scan signals.
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
* This specification is subject to be changed without notice.
COM0
COM1
SEG0
SEG1
LP
FLM
M
65
66
1
2
3
34
66 COM/ 96 SEG 256 Color STN LCD Driver
66
1
2
3
66
1
2003/1/9 (V0.1)
EM65567