參數(shù)資料
型號: S1C88832F0A0100
元件分類: 微控制器/微處理器
英文描述: MICROCONTROLLER, PQFP128
封裝: PLASTIC, QFP-128
文件頁數(shù): 159/160頁
文件大小: 1244K
代理商: S1C88832F0A0100
90
EPSON
S1C88832/88862 TECHNICAL MANUAL
5 PERIPHERAL CIRCUITS AND THEIR OPERATION (LCD Controller)
5.11.3 LCD power supply
Either the internal power supply (built-in LCD
system voltage regulator and voltage booster/
reducer) or an external power supply can be
selected by mask option to generate the LCD
system drive voltages VC1–VC5.
Furthermore, the internal power supply can be
selected from among four types, TYPE A to TYPE
D, according to the LCD panel characteristics.
LCD power supply
s
s Internal power supply TYPE A (VC2 standard, 1/5 bias, 4.5 V)
s
s Internal power supply TYPE B (VC2 standard, 1/5 bias, 5.5 V)
s
s Internal power supply TYPE C (VC2 standard, 1/4 bias, 4.5 V)
s
s Internal power supply TYPE D (VC1 standard, 1/4 bias, 4.5 V)
s
s External power supply
The internal power supply is designed for a small
scale LCD panel and is not suitable for driving a
panel that has large size pixels or for driving a large
capacity panel using an external expanded LCD
driver. In this case, select external power supply
and input the regulated voltage from outside the
IC.
Note that the LCD must be driven with 1/5 bias
when external power supply is selected.
Figure 5.11.3.1 shows the circuit examples when
using an external power supply.
5.11.4 LCD driver
The maximum number of dots changes according
to the drive duty selection.
When 1/32 duty is selected, the combined com-
mon/segment output terminal is switched to the
common terminal. An LCD panel with 51 segments
× 32 commons (maximum 1,632 dots) in the
S1C88832 and 41 segments
× 32 commons
(maximum 1,312 dots) in the S1C88862 can be
driven.
When 1/16 duty is selected, the combined com-
mon/segment output terminal is switched to the
segment terminal. An LCD panel with 67 segments
× 16 commons (maximum 1,072 dots) in the
S1C88832 and 57 segments
× 16 commons
(maximum 912 dots) in the S1C88862 can be driven.
When 1/8 duty is selected, the combined common/
segment output terminal is switched to the segment
terminal as when 1/16 duty is selected. An LCD
panel with 67 segments
× 8 commons (maximum
536 dots) in the S1C88832 and 57 segments
× 8
commons (maximum 456 dots) in the S1C88862 can
be driven. Furthermore, when 1/8 duty is selected,
terminals COM8–COM15 become invalid, in that
they always output an OFF signal.
Table 5.11.4.1 shows the correspondence between
the drive duty and the maximum number of
displaying dots.
Figures 5.11.4.1 to 5.11.4.3 show the 1/5 bias drive
waveforms.
When driving with 1/4 bias, the VC2 voltage level is
the same as VC3.
Model
Mask option
1/32 & 1/16 duty
1/8 duty
1/32 & 1/16 duty
1/8 duty
LDUTY
0
1
×
0
1
×
Duty
1/32
1/16
1/8
1/32
1/16
1/8
Common
terminal
COM0–COM31
COM0–COM15
COM0–COM7
COM0–COM31
COM0–COM15
COM0–COM7
Segment
terminal
SEG0–SEG50
SEG0–SEG66
SEG0–SEG40
SEG51–SEG66
Maximum number
of display dots
1,632 dots
1,072 dots
536 dots
1,312 dots
912 dots
456 dots
S1C88862
S1C88832
VC5
VC4
VC3
VC2
VC1
Rxx
VSS
VIN
VC5
VC4
VC3
VC2
VC1
VSS
VIN *
*
VSS level or high impedance when LCD is not driven.
Fig. 5.11.3.1 Circuit examples when using
an external power supply
Table 5.11.4.1 Correspondence between drive duty and maximum number of displaying dots
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