參數(shù)資料
型號(hào)： OM6208
英文描述： 65 x 96 pixels matrix grey-scale LCD driver
中文描述： 65 × 96像素矩陣灰度LCD驅(qū)動(dòng)器
文件頁(yè)數(shù)： 31/68頁(yè)
文件大?。?/td> 296K
代理商： OM6208
2003 feb 10
31
Philips Semiconductors
Product specification
65 x 96 pixels matrix grey-scale LCD driver
OM6208
The relationship between the parameters F, p, a and N
(number of rows of the display) and the V
on(rms)
and
V
off(rms)
voltage values according to the typical LCD
properties of the pixel are shown in equations (2) and (3).
(2)
(3)
11.10 LCD drive voltage
11.10.1 LCD
DRIVE VOLTAGE GENERATION
V
LCD
may be supplied externally or generated internally by
the on-chip capacitive charge pump. OM6208 features
on-chip capacitors resulting in a minimum of external
components required for operation (see Chapter 16).
The ‘power control’ instruction may be used to switch V
LCD
generation on or off. The charge pump control instruction
may be used to select the required voltage multiplication
factor. The ‘set V
PR
’ instruction is used for programming
the LCD drive voltage V
LCD.
The generation of V
LCD
in OM6208 is illustrated in Fig.29.
This shows all factors that effect V
LCD
generation,
including the 6 bits of MMVOPCAL (from OTP) and the
7 bits resulting from the temperature compensation
mechanism. Equations summarizing all factors are
V
OP
V
PR
MMVOPCAL
+
=
(4)
and
(5)
Where:
V
PR
[7:0] is set in the instruction decoder and is the
programmed V
PR
register value as an unsigned number
MMVOPCAL[5:0] is the value of the offset stored in the
OTP cells in twos complement format
V
T
[7:0] in twos complement format comes from the
temperature compensation block (see Table 16)
a and b are fixed constant values (see Table 14).
Table 14
Parameters of V
LCD
V
on(rms)
F
a
p
a
2
N
2a
+
N
+
(
)
=
V
off(rms)
F
a
p
a
2
N
2a
–
+
N
(
)
=
V
T
+
V
LCD
V
OP
b
a
+
=
SYMBOL
VALUE
UNIT
b
a
0.03
3
V
V
CAUTION
As the programming range for the internally generated
V
LCD
allows values above the maximum allowed V
LCD
(9 V), the user has to ensure, while setting the V
PR
register and selecting the temperature compensation,
that under all conditions and including all tolerances
V
LCD
remains below 9.0 V.
Also, because the programming range for the internally
generated V
LCD
allows values below the minimum
allowed V
LCD
(5 V), the user has to ensure, while setting
the V
PR
register and selecting the temperature
compensation, that under all conditions and including all
tolerances V
LCD
remains above 5.0 V.
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