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INTEDG датащи(PDF) 343 Page - Microchip Technology

номер детали INTEDG
подробное описание детали  64-Pin Flash-Based, 8-Bit CMOS Microcontrollers with LCD Driver and nanoWatt XLP Technology
PDF  478 Pages
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производитель  MICROCHIP [Microchip Technology]
домашняя страница  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

INTEDG датащи(HTML) 343 Page - Microchip Technology

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 2010-2012 Microchip Technology Inc.
DS41414D-page 343
PIC16(L)F1946/47
27.4
LCD Bias Voltage Generation
The LCD module can be configured for one of three
bias types:
• Static Bias (2 voltage levels: VSS and VLCD)
• 1/2 Bias (3 voltage levels: VSS, 1/2 VLCD and
VLCD)
• 1/3 Bias (4 voltage levels: VSS, 1/3 VLCD,
2/3 VLCD and VLCD)
TABLE 27-2:
LCD BIAS VOLTAGES
So that the user is not forced to place external compo-
nents and use up to three pins for bias voltage generation,
internal contrast control and an internal reference ladder
are provided internally to the PIC16(L)F1946/47. Both of
these features may be used in conjunction with the exter-
nal VLCD<3:1> pins, to provide maximum flexibility. Refer
to Figure 27-3.
FIGURE 27-3:
LCD BIAS VOLTAGE GENERATION BLOCK DIAGRAM
Static Bias
1/2 Bias
1/3 Bias
LCD Bias 0
VSS
VSS
VSS
LCD Bias 1
—1/2 VDD
1/3 VDD
LCD Bias 2
—1/2 VDD
2/3 VDD
LCD Bias 3
VLCD3VLCD3VLCD3
VDD
LCDIRE
x 3
3.072V
1.024V from
FVR
VLCD3
LCDIRS
LCDIRE
LCDIRS
LCDCST<2:0>
VLCD3PE
VLCD2
VLCD2PE
VLCD1
VLCD1PE
BIASMD
lcdbias3
lcdbias2
lcdbias1
lcdbias0
LCDA
LCDA
LCDA
A
B
Power Mode Switching
(LRLAP or LRLBP)
2
2
2



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