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© 2004 Microchip Technology Inc.DS91084A-page 1
TB084
INTRODUCTION
The PIC16F91X is a low-cost flash-based PICmicro®
microcontroller that has the ability to drive LCD glass.
This device also has a wide operational voltage range
and low power, making it an ideal candidate for many
battery powered applications. To get the most use from
the battery, the device must operate over a wide
voltage range. The wide voltage range can cause
contrast problems with the LCD glass, so a solution is
needed that will maintain constant LCD voltage and be
very cost effective. In this technical brief we will discuss
three different contrast control systems; external
voltage regulator, comparator buck regulator and
comparator buck/boost regulator.
SYSTEM REQUIREMENTS
LCD glass requires a specific RMS voltage applied
between a segment and a common to create the
required polarization shift. Different pieces of glass are
designed for different voltages with the most common
type of glass being 5.0V glass. Lower voltage glass is
available, though as the voltage gets below 3V, it is
more difficult to create large panels with acceptable
contrast.
The PIC16F91X has a series of analog switches to
connect the segment and common pins to 4 voltages.
Three of the voltages are applied to the VLCD<3:0>
pins. The fourth voltage is internally connected to VSS.
To operate the LCD module, correct voltages must be
applied to these pins. The voltages applied depend
upon the type of LCD drive and the type of glass.
FIGURE 1:VOLTAGE APPLICATION
Author:Joseph Julicher
Microchip Technology Inc.
Static
Bias 1/2 Bias1/3 Bias
VLCD 0VSS SSSSV V
VLCD 1—VDD DDV
VLCD 2—VDD DDV
VLCD 3VDD VDD DDV
VLCD3
VLCD2
VLCD1
VLCD0(1)
To
LCD
Driver
Ω
LCD Bias 3LCD Bias 2LCD Bias 1
V
DD
*
V
DD
*
V
DD
*
Connections for External R-ladder
Status Bias
1/2 Bias
1/3 Bias
10 k*
Ω
10 k*
Ω
10 k*
Ω
10 k*
Ω
10 k*
V
SS
V
SS
*These values are provided for design guidance only and should be optimized for the application
by the designer.
Note 1:Internal connection.
Contrast Control Circuits for the PIC16F91X
Produktspecifikationer
| Varumärke: | Microchip |
| Kategori: | Inte kategoriserad |
| Modell: | PIC16F946 |
| Färg på produkten: | Grijs |
| Vikt: | 55 g |
| Bredd: | 39.8 mm |
| Djup: | 16.6 mm |
| Höjd: | 110 mm |
| Ursprungsland: | China |
| Inspänning: | 4.75 - 5.25 V |
| Ethernet LAN, dataöverföringshastigheter: | 10,100,1000,2500 Mbit/s |
| Förvaringstemperatur: | 20 - 80 °C |
| Strömförsörjning via USB: | Ja |
| Full duplex: | Ja |
| Chipset: | RTL8156B |
| Vakna på LAN: | Ja |
| Drifttemperatur (TT): | 0 - 40 °C |
| Anslutning 1: | USB-C USB 3.1 |
| Anslutning 2: | RJ-45 |
| Kontakt 1 formfaktor: | Recht |
| Kontakt 2 formfaktor: | Recht |
| Anslutning 1 typ: | Mannelijk |
| Anslutning 2 typ: | Vrouwelijk |
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