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EM6620WS27 데이터시트(PDF) 35 Page - EM Microelectronic - MARIN SA

부품명 EM6620WS27
상세설명  Ultra Low Power Microcontroller with 4x8 LCD Driver
PDF  56 Pages
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제조업체  EMMICRO [EM Microelectronic - MARIN SA]
홈페이지  http://www.emmicroelectronic.com
Logo EMMICRO - EM Microelectronic - MARIN SA

EM6620WS27 데이터시트(HTML) 35 Page - EM Microelectronic - MARIN SA

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EM6620
Copyright
© 2005, EM Microelectronic-Marin SA
35
www.emmicroelectronic.com
12. LCD Driver
The EM6620 has a built-in Liquid Crystal Display driver. A maximum of 32 segments can be displayed using
the 8 segment driver outputs (SEG[8:1) in 4:1 multiplex - 24 segments in the case of 3:1 multiplex - and the 4
back-planes (COM[4:1]).
The LCD driver has its own voltage regulator (1.05 Volt) and voltage multiplier to generate the driver bias
voltages VL1, VL2 and VL3 (VLCD). Using the metal1 mask the user can choose higher LCD reference
voltages. Please check with EM Marin the possible values and their impact on power consumption.
The special architecture of this LCD driver allows the user to specify the data and address for each individual
segment by metal mask option. It therefore adapts to every possible LCD display with a maximum of 32
independent segments. The LCD clock frequency is 256Hz. Thus the frame frequency is 256/8 Hz if 4:1
multiplex, or 256/6 if 3:1 multiplex.
Figure 25. LCD Architecture
RefLCD
LCD External
Supply
LCD Blank
Address
Bus
SEG[n]
x3
Enable
x2
x1
Voff
LCD Off
Von
MUX
Output
Switches
Voltage
Multiplier
Phase
Selection
Data
Latches
Data
Bus
Phase 1 to 4
3
4
2
1
VL1
VL2
VL3



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