AN3114 datasheet(18/43 Pages) STMICROELECTRONICS

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Integrated LCD controller

AN3114

18/43

Doc ID 16829 Rev 3

Integrated LCD controller

3.1

Benefits of integrated LCD controllers

The medium density STM8AL3Lxx devices, medium density STM8L152xx devices,

medium+ density STM8L152xx devices, and high density STM8L152xx/STM8L162xx

integrate an LCD control module that offers various advantages, including its overall design

optimized to achieve an immediate reduction in component count and board space saving,

and thus reducing the total system cost and power consumption.

The LCD controller is composed of three main blocks (see Figure 10: Medium density LCD

controller block diagram and Figure 11: Medium+ and high density LCD controller block

diagram):

●

The frequency generator

●

The common/segments driver

●

The contrast controller

Figure 10.

Medium density LCD controller block diagram

LCDCLK

LCD RAM

(14x8 bits)

COM0

COM3

SEG27

SEG0

VLCD

VSS

SEG[27:0]

COM[3:0]

PS[3:0]

DIV[3:0]

LCDCLK/65536

LCDCLK

ck_div

CLOCK MUX

Divide by 16 to 31

Analog

switch

array

CONTRAST

CONTROLLER

LCD REGS

VOLTAGE

GENERATOR

CC[2:0]

1/3 VLCD

2/3 VLCD

1/2 VLCD

COM

DRIVER

SEG

DRIVER

Interrupt

PULSE GEN

ck_ps

I/O Ports

Analog booste r

READY

VSEL

STATIC

16-bit Prescaler

LCD REGS

FREQUENCY GENERATOR

COMMON/SEGMENT DRIVER

CONTRAST CONTROLLER

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