OM6208 NXP Semiconductors, OM6208 Datasheet - Page 31

• Manufacturer Part Number: OM6208
• Description: Om6208 65 X 96 Pixels Matrix Grey-scale Lcd Driver
• Manufacturer: NXP Semiconductors

Philips Semiconductors
The relationship between the parameters F, p, a and N
(number of rows of the display) and the V
V
properties of the pixel are shown in equations (2) and (3).
11.10 LCD drive voltage
11.10.1 LCD
V
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
generation on or off. The charge pump control instruction
may be used to select the required voltage multiplication
factor. The ‘set V
the LCD drive voltage V
The generation of V
This shows all factors that effect V
including the 6 bits of MMVOPCAL (from OTP) and the
7 bits resulting from the temperature compensation
mechanism. Equations summarizing all factors are
and
Where:
2003 feb 10
off(rms)
LCD
V
programmed V
MMVOPCAL[5:0] is the value of the offset stored in the
OTP cells in twos complement format
V
temperature compensation block (see Table 16)
a and b are fixed constant values (see Table 14).
65 x 96 pixels matrix grey-scale LCD driver
PR
T
[7:0] in twos complement format comes from the
may be supplied externally or generated internally by
[7:0] is set in the instruction decoder and is the
voltage values according to the typical LCD
V
V
V
OP
on(rms)
off(rms)
DRIVE VOLTAGE GENERATION
=
PR
PR
V
V
LCD
’ instruction is used for programming
LCD
=
=
register value as an unsigned number
PR
F
-- -
a
F
-- -
a
+
in OM6208 is illustrated in Fig.29.
=
LCD.
MMVOPCAL
V
p
------------------------------------------ -
p
----------------------------------------- -
OP
a
a
b
2
2
+
+
+
N
N
LCD
N
N 2a
a
+
–
generation,
+
2a
V
on(rms)
T
and
LCD
(2)
(3)
(4)
(5)
31
Table 14 Parameters of V
As the programming range for the internally generated
V
(9 V), the user has to ensure, while setting the V
register and selecting the temperature compensation,
that under all conditions and including all tolerances
V
Also, because the programming range for the internally
generated V
allowed V
the V
compensation, that under all conditions and including all
tolerances V
LCD
LCD
SYMBOL
PR
allows values above the maximum allowed V
remains below 9.0 V.
register and selecting the temperature
b
a
LCD
LCD
LCD
(5 V), the user has to ensure, while setting
allows values below the minimum
remains above 5.0 V.
CAUTION
VALUE
LCD
0.03
3
Product specification
OM6208
UNIT
V
V
PR
LCD