MC141535 Ver la hoja de datos (PDF) - Motorola => Freescale

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MC141535

LCD Segment / Common Driver with Controller

Motorola => Freescale 

option 1 to enables the Internal Regulator which consists of the internal

contrast control and temperature compensation circuits.

Set Internal Voltage Divider On/Off

If the Internal Voltge Divider is disabled, external bias can be used

for VLL6 to VLL2. If the Interna Voltagel Divider is enabled, the internal

circuit will generated the 1:5 bias driving voltage.

Set Internal Contrast Control On/Off

This command is used to turn on or off the internal control of delta

voltage of the bias voltages. With bit option = 1, the software selection

for delta bias voltage control is enabled. With bit option = 0, internal

contrast control is disabled.

Increase / Decrease Contrast Level

If the internal contrast control is enabled, this command is used to

increase or decrease the contrast level within the 16 contrast levels.

The constrast level starts from the lowest value after POR.

Set Contrast Level

This command is to select one of the 16 contrast levels when internal

contrast control circuitry is in use. After power-on reset, the contrast

level is the lowest.

Read Contrast Value

This command allows the user to read the current contrast level

value. With R/W input high (READ), D/C input low (COMMAND) and D7

D6 D5 D4 are equal to 0 0 0 1, the value of the internal contrast value

can be read on D0-D3 at the falling edge of CS.

Set Temperature Coefficient

A temperature gradient selector circuit controlled by two control bits

TC1 and TC2. This command can select 4 different LCD driving voltage

temperature coefficients to match various liquid crystal temperature

grades. Those temperature coefficients are specified in Electrical Char-

acteristics Tables.

Set Display Frequency

This commnad set the LCD panel display to normal frequency or

slow frequency.

COMMAND TABLE

Bit Pattern

000000X1X0

0001X3X2X1X0

0010000X0

0010001X0

0010010X0

0010011X0

0010100X0

0010101X0

0010110X0

0010111X0

0011000X0

Command

Set GDDRAM Page Address

Set / Read Contrast Level

Set Voltage Doubler / Tripler

Set Column Mapping

Set Row Mapping

Set MSB of GDDRAM Column

Address

Set Display On/Off

Set Internal DC/DC Converter On/Off

Set Internal Regulator Enable

Set Internal Voltage Divider On/Off

Set Internal Contrast Control On/Off

Comment

Set GDDRAM Page Address using X1X0 as address bits.

X1X0=00 : page 1 (POR)

X1X0=01 : page 2

X1X0=10 : page 3

With R/W pin input low, set one of the 16 available values to the

internal contrast register, using X3X2X1X0 as data bits. The con-

trast register is reset to 0000 during POR.

With R/W pin input high, and at the rising edge of CS, the value of

the internal contrast register will be latched out at D3 D2 D1 D0

pins, i.e. X3X2X1X0, at the rising edge of CS.

X0=0: Tripler enable (POR)

X0=1: Doubler enable

X0=0 : Col0 to Seg0 (POR)

X0=1 : Col0 to Seg119

X0=0 : Row0 to Com0

X0=1: Row0 to Com15

X0=0 : MSB = 0 (POR)

X0=1 : MSB = 1

X0=0: display off (POR)

X0=1: display on

X0=0: Internal DC/DC Converter off(POR)

X0=1: Internal DC/DC Converter on

X0=0: Internal Regulator off (POR)

X0=1: Internal Regulator on

When application uses a supply with built-in temperature compen-

sation, the regulator should be disabled .

X0=0: Internal Voltage Divider off(POR)

X0=1: Internal Voltage Divider on

When an external bias network is preferred, the voltage divider

should be disabled.

X0=0: Internal Constrast Control off(POR)

X0=1: Internal Constrast Control on

Internal contrast circuits can be disabled if external contrast cir-

cuits is preferred.

MC141535

3–88

MOTOROLA

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