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EM6821 датащи(PDF) 46 Page - EM Microelectronic - MARIN SA

номер детали EM6821
подробное описание детали  Ultra Low Power uController with 4x20 LCD Driver
PDF  68 Pages
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производитель  EMMICRO [EM Microelectronic - MARIN SA]
домашняя страница  http://www.emmicroelectronic.com
Logo EMMICRO - EM Microelectronic - MARIN SA

EM6821 датащи(HTML) 46 Page - EM Microelectronic - MARIN SA

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EM6821
Copyright
© 2005, EM Microelectronic-Marin SA
46
www.emmicroelectronic.com
14. LCD Driver
The EM6821 has a built-in Liquid Crystal Display (LCD) driver. A maximum of 80 Segments can be displayed
using the 20 Segment driver outputs (SEG[20:1) in 4:1 multiplex ,60 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 freely specify the data and address for each
individual Segment using the interconnect metal2 mask . It therefore adapts to every possible LCD display with
a maximum of 80 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 35. 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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