MC141539 View Datasheet(PDF) - Motorola => Freescale

Part Name

Description

Manufacturer

MC141539

LCD Segment / Common Driver with Controller

Motorola => Freescale 

PIN DESCRIPTIONS

D/C (Data / Command)

This input pin acknowledge the driver the input at D0-D7 is data or

command. Input High for data while input Low for command.

CS (CLK) (Input Clock)

This pin is normal Low clock input. Data on D0-D7 is latched at the

falling edge of CS.

RES (Reset)

An active Low pulse to this pin reset the internal status of the

driver (same as power on reset). The minimum pulse width is 10 µs.

CE (Chip Enable)

HIGH input to this pin to enable the control pins on the driver.

D0-D7

This bi-directional bus is used for data / command transferring.

R/W (Read/Write)

This is an input pin. To read the display data RAM or the internal

status (Busy / Idle), pull this pin High. The R/W input Low indicates a

write operation to the display data RAM or to the internal setup regis-

ters.

OSC1 (Oscillator Input)

For internal oscillator mode, this is an input for the internal low

power RC oscillator circuit. In this mode, an external resistor of cer-

tain value is placed between the OSC1 and OSC2 pins for a range of

internal operating frequencies (refer to Figure 1). For external oscilla-

tor mode, OSC1 should be left open.

OSC2 (Oscillator Output / External Oscillator Input)

This is an output for the internal low power RC oscillator circuit.

For external oscillator mode, OSC2 will be an input pin for external

clock and no external resistor is needed.

VLL6 - VLL2

Group of voltage level pins for driving the LCD panel. They can

either be connected to external driving circuit for external bias supply

or connected internally to built-in divider circuit. For internal Voltage

Divider enabled, a capacitor to AVSS is required on each pin.

DUM1 and DUM2

If internal Voltage Divider is enabled with 1/7 bias selected, a

capacitor to AVSS is required on each pin. Otherwise, pull these two

pin to AVSS

C1N and C1P

If Internal DC/DC Converter is enabled, a capacitor is required to

connect these two pins.

C2N and C2P

If 32 Mux is selected and Internal DC/DC Converter is enabled, a

capacitor is required between these two pins. Otherwise, leave these

pin open.

C+ and C-

If internal divider circuit is enabled, a capacitor is required to con-

nect between these two pins.

VR and VF

This is a feedback path for the gain control (external contrast con-

trol) of VLL1 to VLL6. For adjusting the LCD driving voltage, it

requires a feedback resistor placed between VR and VF, a gain con-

trol resistor placed between VF and AVSS, a 10 µF capacitor placed

between VR and AVSS. (Refer to the Application Circuit Section)

COM0-COM31 (Row Drivers)

These pins provide the row driving signal to LCD panel. Com0-

Com31 are used in 32 mux configuration. Com0-Com15 are used in

16 mux and no row remap configuration while Com16-Com31 are

used in 16 mux with row remap configuration. They output 0V during

display off.

SEG0-SEG119 (Column Drivers)

These 120 pins provide LCD column driving signal to LCD panel.

They output 0V during display off.

BP (Annunciator Backplane)

This pin combines with Annun0-Annun3 pins to form annunciator

driving part. When the annunciator circuit is enabled, it will output

square wave of FANNn Hz. It outputs low when oscillator is disabled.

Annun0 - Annun3 (Annunciator Frontplanes)

These pins are four independent annunciator driving outputs. The

enabled annunciator outputs from its corresponding pin a FANNn Hz

square wave which is 180 degrees out of phase with BP. Disabled

annunciator output from its corresponding pin an square wave in-

phase with BP. When oscillator is disabled, all these pins output 0V.

AVDD and AVSS

AVDD is the positive supply to the LCD bias voltage generator.

AVSS is ground.

VCC

For using the Internal DC/DC Converter, a 0.1 µF capacitor from

this pin to AVSS is required. It can also be an external bias input pin

if Internal DC/DC Converter is not used. Positive power is supplied to

the LCD Driving Level Selector and HV Buffer Cell with this pin. Nor-

mally, this pin is not intended to be a power supply to other compo-

nent.

DVDD and DVSS

Power is supplied to the digital control circuit of the driver using

these two pins. DVDD is power and DVSS is ground.

MOTOROLA

MC141539

3–131

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