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PIC16C925-S/CL датащи(PDF) 97 Page - Microchip Technology

номер детали PIC16C925-S/CL
подробное описание детали  64/68-Pin CMOS Microcontrollers with LCD Driver
PDF  182 Pages
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производитель  MICROCHIP [Microchip Technology]
домашняя страница  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

PIC16C925-S/CL датащи(HTML) 97 Page - Microchip Technology

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 2001 Microchip Technology Inc.
Preliminary
DS39544A-page 95
PIC16C925/926
11.5
Voltage Generation
There are two methods for LCD voltage generation:
internal charge pump, or external resistor ladder.
11.5.1
CHARGE PUMP
The LCD charge pump is shown in Figure 11-9. The
1.0V - 2.3V regulator will establish a stable base volt-
age from the varying battery voltage. This regulator is
adjustable through the range by connecting a variable
external resistor from VLCDADJ to ground. The poten-
tiometer provides contrast adjustment for the LCD. This
base voltage is connected to VLCD1 on the charge
pump. The charge pump boosts VLCD1 into VLCD2 =
2*VLCD1 and VLCD3 = 3 * VLCD1. When the charge
pump is not operating, Vlcd3 will be internally tied to
VDD. See the Electrical Specifications section for
charge pump capacitor and potentiometer values.
11.5.2
EXTERNAL R-LADDER
The LCD module can also use an external resistor lad-
der
(R-Ladder)
to generate
the
LCD
voltages.
Figure 11-9 shows external connections for static and
1/3 bias. The VGEN (LCDCON<4>) bit must be cleared
to use an external R-Ladder.
FIGURE 11-9:
CHARGE PUMP AND RESISTOR LADDER
Control
Logic
3
2
C
CPCLK
2
C
3
2
C+ VGEN
3
VGEN
VDD
Regulator
VGEN
VLCD3
VLCD2
VLCD1
VLCD0
To
LCD
Drivers
Connections for
internal charge
pump, VGEN = 1
VLCD3
VLCD3
Connections for
external R-ladder,
1/3 Bias,
VGEN = 0
Connections for
external R-ladder,
Static Bias,
VGEN = 0
0.47
µF*
0.47
µF*
0.47
µF*
0.47
µF*
10 k
Ω*
10 k
Ω*
10 k
Ω*
5k
Ω*
5k
Ω*
10 k
Ω*
130 k
Ω*
100 k
Ω*
C2
VLCD2
VLCD1
VLCD3C1
VLCDADJ
* These values are provided for design guidance only and should be optimized to the application by the designer.
10
µA



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