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參數(shù)資料
| 型號： | UC1606 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | 65COM x 132SEG Matrix LCD Controller-Driver |
| 中文描述： | 65COM x 132SEG矩陣LCD控制器驅(qū)動器 |
| 文件頁數(shù)： | 17/46頁 |
| 文件大?。?/td> | 895K |
| 代理商： | UC1606 |
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UC1606
65x132 Matrix LCD Controller-Drivers
Version 1.32
15
LCD V
OLTAGE
S
ETTINGS
M
ULTIPLEX
R
ATES
Four multiplex rates are supported in UC1606 (65,
49, 33, 25). MR is not software programmable. It is
determined by pin programming.
B
IAS
S
ELECTION
Bias Ratio (
BR
) is defined as the ratio between
V
LCD
and V
B
, i.e.
BR = V
LCD
/V
B
, where V
B
= V
B1+
–
V
B1–
= V
B0+
– V
B0–
.
The reference
Bias Ratio
can be estimated by:
1
+
Mux
UC1606 supports four bias ratios for each MR
(Mux Rate) setting as illustrated below.
Bias Ratio (BR[1:0])
00
01
7.33
8.0
6.0
6.67
4.67
5.33
Mux Rate
65
49
33/25
10
8.66
7.33
6.0
11
9.33
8.0
6.66
Table 1:
BR vs. Mux Rates
BR can be selected either by software program or
by hardware pin wiring.
V
B
G
ENERATION
V
B
is generated internally by UC1606. The value of
V
B
is determined by three control registers:
GN
(Gain),
PM
(Potential Meter), TC (Temperature
Compensation) with the following relationship:
PM
B
V
Gain
V
×
=
where V
PM
is the output of an internal Electronic
Potential Meter.
The value of V
PM
is given by:
REF
PM
V
PM
V
×
+
=
1200
600
The value of
Gain
is controlled by GN[2:0]. Their
relationship is shown below:
GN[2:0]
000 001 010 011 100 101 110 111
Gain
1.43 1.58 1.72 1.89 2.08 2.28 2.49 2.72
Table 2:
Gain vs. GN value
V
REF
Temperature Compensation
V
REF
is a temperature compensated reference
voltage. V
REF
increases automatically as ambient
temperature cools down.
Four (4) different temperatures compensated V
REF
can be selected via pin wiring. The compensation
coefficient is given by the following table:
TC[1:0]
00
0.0
01
10
11
% per
o
C
–0.05 –0.10 –0.20
Table 3:
Temperature Compensation
For all TC values, V
REF
are normalized to 1.25V at
25
C. When selecting TC, make sure V
B+
and
V
LCD
stays within specified UC1606 ratings across
entire operating temperature range.
V
LCD
S
ELECTION
V
LCD
may be supplied either by internal charge
pump or by external power supply. The source of
V
LCD
is controlled by PC[2:1].
When V
LCD
is generated internally its value has
the following relationship with V
B
:
B
LCD
V
BiasRatio
V
×
=
Given V
REF
= 1.25V at 25
o
C, V
LCD
becomes:
25
.
×
1200
600
+
×
×
PM
Gain
BiasRatio
V
LCD
(1)
When PM=0, then equation (1) becomes:
6
Gain
BiasRatio
V
LCD
×
(1b)
L
OAD
D
RIVING
S
TRENGTH
UC1606’s drivers and power supply circuits are
designed to handle capacitance load of >2.5pF
per pixel at V
LCD
=10.5V when V
DD2
> 2.4V.
UC1606 load driving strength is sensitive to ITO
impedance of power supply circuits (V
DD
, V
SS
,
V
B0/B1
, V
LCD
.) Be sure to minimize these ITO trace
resistance for COG applications.
P
OWER
S
UPPLY
C
ONFIGURATION
UC1606 has built-in charge pump with on-chip
pumping capacitors. The number of pump stages
can be programmed by setting PC[2:1] register.
Make sure the chip is in Reset mode before
changing the value of PC[2:0].
Given the same display quality, the lower PC[2:1]
setting the more efficient is UC1606, but the
weaker is the driving strength. In application,
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