Maxim-integrated MAXQ Family Users Guide: MAXQ2000 Supplement Manual de usuario descargar pdf (Pagina 66)

LCD CONTROLLER (SPECIFIC TO MAXQ2000)

The MAXQ2000 provides an on-board LCD controller module that can generate segment and common signals for an LCD based on

display memory content. Once the LCD controller settings and display memory have been initialized, the LCD segment and common

signals are generated automatically at the selected display frequency. No additional processor overhead is required while the LCD

controller is running.

LCD Controller Features

• Automatic LCD segment and common-drive signal generation

• Four types of display modes supported:

Static

1/2 duty multiplexed with 1/2 bias voltages

1/3 duty multiplexed with 1/3 bias voltages

1/4 duty multiplexed with 1/3 bias voltages

• 68-pin package: Up to 36 segment (SEG0 to SEG35) outputs and four common (COM0 to COM3) outputs

• 56-pin package: Up to 28 segment (SEG0 to SEG27) outputs and four common (COM0 to COM3) outputs

• Unused segment outputs can be used as general-purpose port pins

• 17 bytes (136 bits) of display memory

• Unused display memory can be used for general-purpose storage

• Flexible LCD clock source, selectable from 32kHz or HFClk / 128

• Adjustable frame frequency

•Internal voltage divider resistors eliminate requirement for external components

•Internal adjustable resistor allows contrast adjustment without external components

• Capability to use external resistors to adjust drive voltages and current capacity

FRAME

FREQUENCY

TIMING CONTROL

SEGMENT DRIVER

COMMON DRIVER

WAVEFORM GENERATION

DISPLAY MEMORY

(REGISTER FILE)

LCFG

OPM

LCRA

DPE

PCF

LRIG

BIAS

DUTY

FRM

LCD

FRAME

SEG0

SEG35

COM0

COM1

COM2

COM3

LCD

LCD1

LCD2

ADJ

VOLTAGE CONTROL

Figure 8. LCD Controller Block Diagram

MAXQ Family User’s Guide:

MAXQ2000 Supplement

Maxim Integrated

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