Table 57-37. LCD power supply configuration options (continued)
VSUPPLY[1:0]
Configuration
powersw1
powersw2
11
Drive V
LL3
externally from V
DD
or
Drive V
LL1
internally from V
IREG
0
0
Note
The charge pump is optimized for 1/3 bias mode operation
only.
The charge pump requires external capacitance for its
operation. To provide this external capacitance, the V
cap1
and
V
cap2
external pins are provided. It is recommended that a
ceramic capacitor be used. Proper orientation is imperative
when using a polarized capacitor. The recommended value for
the external capacitor is 0.1
μ
F.
57.4.4.1 LCD power supply configuration
The LCD bias voltages can be internally derived from V
DD
, internally derived from a
voltage source (should never be externally driven to any level other than V
DD
) connected
to V
LL3
, internally derived from a regulated voltage source that can be configured to
supply 1.0 or 1.67 V (V
IREG
). The following table provides a more detailed description of
the power state of the LCD controller that depends on the configuration of the
VSUPPLY[1:0], CPSEL and RVEN bits. The table shows all possible configurations of
the LCD power supply. All other combinations of the configuration bits above are not
permissible LCD power supply modes and should be avoided.
Table 57-38. LCD power supply options
LCD operational state
LCD power supply configuration
VSUPPLY[1:0]
HREFSEL
CPSEL
RVEN
V
LL2
connected to V
DD
internally for 3 V or 5 V
glass operation.
For 3 V glass operation, V
DD
must be
equal to 2 V.
For 5 V glass operation, V
DD
must be
equal to 3.33 V.
Charge pump is used to generate V
LL1
and V
LL3
.
00
X
1
0
Table continues on the next page...
Functional description
K53 Sub-Family Reference Manual, Rev. 6, Nov 2011
1776
Freescale Semiconductor, Inc.
Содержание K53 Series
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