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參數(shù)資料
| 型號： | OM6218SP1 |
| 英文描述： | TRANSISTOR | MOSFET | MATCHED PAIR | N-CHANNEL | 60V V(BR)DSS | 20A I(D) | SIP |
| 中文描述： | 晶體管| MOSFET的|配對| N溝道| 60V的五（巴西）直| 20A條（?。﹟園區(qū) |
| 文件頁數(shù)： | 16/40頁 |
| 文件大小： | 213K |
| 代理商： | OM6218SP1 |
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2001 Nov 07
16
Philips Semiconductors
Product specification
48
×
84 pixels matrix LCD driver
OM6213
11.8
V
LCD
generator
ThebinarynumberV
OP
representingtheoperatingvoltage
can be set by the serial interface command and can be
adjusted (calibrated) by 5 input pins according to the
following formulae:
V
OP
V
OS
V
CAL
+
=
(1)
where:
V
OP
is an 8-bit unsigned number used internally for
generation of the LCD supply voltage V
LCD
V
OS
is a 5-bit two’s complement number set by the
5 input pins V
OS
[4:0]; see Table 6
V
CAL
is a 5-bit two’s complement number set by the
Module Maker; see Table 7
V
PR
isa7-bitunsignednumbersetbytheserialinterface
command.
To avoid numerical overflow the allowed values of V
PR
should be limited to the range V
PR(min)
to V
PR(max)
(decimal).
The corresponding voltage at the reference temperature,
T
CUT
, can be calculated as:
V
LCD Tcut
)
=
(2)
The generated voltage at V
LCD
is dependent on the
temperature, programmed temperature coefficient (TC)
and the programmed voltage at the reference temperature
(T
CUT
).
V
LCD
a
V
OP
b
×
+
(
)
×
=
(3)
T
CUT
, a and b for each temperature coefficient are given in
Table 6. The maximum voltage that can be generated is
dependent on the voltage of V
DD2
and the display load
current.
Astheprogrammingrangefortheinternallygenerated
V
LCD
allows values above the maximum allowed V
LCD
,
the user has to ensure while setting the V
PR
register
and selecting the Temperature Compensation (TC),
that under all conditions and including all tolerances
the V
LCD
limit of maximum 9 V will never be exceeded.
For a particular liquid, the optimum V
LCD
can be calculated
for a given multiplex rate. For a mux rate of 1 : 48, the
optimum operating voltage of the liquid can be calculated
as follows;
(4)
where V
th
is the threshold voltage of the liquid crystal used.
2
V
PR
×
(
)
+
a
V
OP
b
×
+
(
)
1
TC
T
T
CUT
–
(
)
×
+
[
]
V
LCD
48
+
2
1
48
--1
–
---------1
th
6.06 V
th
=
=
Table 6
Typical values for parameters of the HV generator programming
V
LCD(min)
values are the values corresponding to V
PR(min)
.
V
LCD(max)
values are the theoretical values corresponding to V
PR(max)
. Under all conditions and including all tolerances
V
LCD
must never exceed 9 V.
Example: V
PR
is set to 63 (decimal) and TCB is selected. At temperature T
CUT
the measured V
LCD
is 6.9 V. The user
wants to decrease V
LCD
by 100 mV in order to set V
LCD
to 6.8 V. The best value for V
OS
is then
4 decimal (11100 binary
in the two’s complement notation).
If V
PR
[6:0] is set to zero, the charge pump is turned off.
SYMBOL
TCA
TCB
TCC
TCD
UNIT
a
b
T
CUT
TC
V
PR(min)
V
PR(max)
V
LCD(min)
V
LCD(max)
3.06
30.3
27
0
49
127
6.04
10.77
3.84
24.3
27
0.87
20
101
4.81
8.74
3.62
26.1
27
0.58
30
110
5.18
9.35
3.37
28.0
27
0.29
39
120
5.56
10.11
V
mV
°
C
10
-3
/
°
C
decimal
decimal
V
V
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