參數(shù)資料
型號(hào)： PCF8812
廠商： NXP Semiconductors N.V.
英文描述： CRYSTAL, 8.0 MHZ
中文描述： 65 × 102像素矩陣LCD驅(qū)動(dòng)器
文件頁數(shù)： 17/36頁
文件大?。?/td> 201K
代理商： PCF8812
2000 Nov 22
17
Philips Semiconductors
Product specification
65
×
102 pixels matrix LCD driver
PCF8812
10.9
Temperature control
Due to the temperature dependency of the liquid crystals
viscosity the LCD controlling voltage V
LCD
must be
increased with lower temperature to maintain optimum
contrast. There are 4 different temperature coefficients
available in the PCF8812 (see Fig.13). The coefficients
are selected by bits TC1 to TC0.Table 6 shows the typical
values of the different temperature coefficients. The
coefficients are proportional to the programmed V
LCD
.
10.10 Set V
OP
value
The operating voltage V
LCD
can be set by software. The
generated voltage is dependent on temperature,
programmed Temperature Coefficient (TC) and the
programmed voltage at reference temperature (T
cut
).
V
LCD T
a
V
OP
b
+
=
(1)
The voltage at reference temperature [V
LCD
(T = T
cut
)] can
be calculated as follows:
V
LCD T = T
cut
)
(2)
The parameters are explained in Table 6. The maximum
voltage that can be generated is dependent on the V
DD2
voltage and the display load current. Two overlapping
V
LCD
ranges are selectable via the command ‘HV-gen
control’. For the LOW (PRS = 0) range a = a
1
and for the
HIGH(PRS = 1)rangea = a
2
withstepsequalto ‘b’inboth
ranges. It should be noted that the charge pump is turned
off if V
OP
6 to 0 and the bit PRS are all set to zero
(see Fig.14).
For MUX 1 to 65 the optimum operating voltage of the
liquid can be calculated as follows;
(3)
where V
th
is the threshold voltage of the liquid crystal
material used.
Table 6
Typical values for parameters for the
HV-generator programming
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
OP
register
and selecting the Temperature Compensation (TC), that
under all conditions and including all tolerances that V
LCD
remains below 9 V.
handbook, halfpage
MGS402
T
Tcut
Fig.13 Temperature coefficients.
×
(
)
1
(
T
T
cut
–
(
)
TC
×
+
)
a
V
OP
b
×
+
(
)
=
SYMBOL
VALUE
UNIT
a1
a2
b
T
cut
2.94 (PRS = 0)
6.75 (PRS = 1)
0.03
27
V
V
V
°
C
V
LCD
65
+
2
1
65
--1
–
×
--------1
V
th
×
6.85
V
th
×
=
=
相關(guān)PDF資料
PDF描述
PCF8812U CRYSTAL, 8,0 MHZ
PCF8813 (67 + 1) x 102 pixels matrix LCD driver
PCF88132 (67 + 1) x 102 pixels matrix LCD driver
PCF88132DA (67 + 1) x 102 pixels matrix LCD driver
PCF8813U (67 + 1) x 102 pixels matrix LCD driver
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
PCF8812U 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:65 x 102 pixels matrix LCD driver
PCF8812U/2 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:65 x 102 pixels matrix LCD driver
PCF8812U/2/F1 制造商:PH 功能描述:
PCF8813 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:(67 + 1) x 102 pixels matrix LCD driver
PCF88132 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:(67 + 1) x 102 pixels matrix LCD driver
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