參數(shù)資料
型號(hào)： CL-PS7110-VC-A
廠商： CIRRUS LOGIC INC
元件分類(lèi)： 微控制器/微處理器
英文描述： Low-Power System-on-a-Chip
中文描述： MROM, RISC MICROCONTROLLER, PQFP208
封裝： VQFP-208
文件頁(yè)數(shù)： 24/82頁(yè)
文件大?。?/td> 1101K
代理商： CL-PS7110-VC-A
DATA BOOK v1.5
May 1997
24
FUNCTIONAL DESCRIPTION
CL-PS7110
Low-Power System-on-a-Chip
to 15-in-16. The sense of the DC-to-DC converter drive signal (active-high or -low) is determined by latch-
ing the state of this drive signal during power-on reset (that is, a pull-up resistor on the drive signal results
in an active-low drive output and vice versa). This allows either positive or negative voltages to be gener-
ated by the DC-to-DC converter.
An example of how to use the DC-to-DC converter is shown below. The objective of Example 1 is to have
constant V
EE
for the bias generator of an LCD panel to control the contrast. Four of the GPIO pins (shown
as PD4, PD5, PD6 and PD7 in
Figure 1-2
and
Figure 1-3
) are used to choose various resistor values. The
Drive 1 pin is connected to the base of the biasing transistor. The V
EE
is the maximum voltage that is
required.The feedback mechanism via the FB1 pin ensures that whenever software changes the pulse
width using the Pump Control register (PMPCON), the voltage level is kept at the desired level for V
EE
.
The same technique could be used for keeping V
PP
for flash at a constant level as shown in Example 2.
Example 1
Following is a sample schematic for a positive and negative V
EE
control circuitry. The same circuitry may
be applied for the 12-V V
PP
generator. Assume that the nominal V
EE
voltage for a given LCD is 28 V, and
the range covered is from 27 to 29 V (to assure a sufficient contrast control range).
1.
Connect a load resistor over C2 to force approximately 2 mA of current (or whatever your panel’s typical
value is).
2.
Program the Pump Control register to 5, set PD7..4 to high.
3.
Set R55 such that V
EE
is at the minimum 27 V.
4.
Set PC7..4 to ‘1111’; V
EE
should exceed 29 V.
Resistor
Notes
R75
Pull down for positive V
EE
.
R53
Pull up for LM339 open-drain output.
R54
Choose to select a voltage at the + terminal of the com-
parator at what point the feedback output will switch off
(high), thus turning off the Drive output.
R55
To select voltage level on the + input of the comparator to
application V
REF
(1.5V).
R62–65
This resistor network allows V
EE
to be programmed
under program control. If all outputs are low, V
EE
is at the
maximum. Turning on the outputs increases the voltage
at the comparator, and therefore decreases V
EE
.
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