NJU6676CH 데이터 시트보기 (PDF) - Japan Radio Corporation

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NJU6676CH

64-Common X 132-Segment plus 1-Icon Bit Map Type LCD Controller and Driver

Japan Radio Corporation  

NJU6676

PRELIMINARY

f) Oscillator

This is the low power consumption CR oscillator which provides the display clock and voltage

converter-timing clock.

e) Internal power circuits

The internal power circuits are composed of x4 boost voltage converter, output voltage regulator

including 64-step EVR and voltage followers.

The optimum values of the external passive components for the internal power circuits, such as

capacitors for V1 to V5 terminals and feed back resistors for VR terminal, depend on LCD panel size.

Therefore, it is necessary to evaluate the actual LCD module with these external components in

order to determine the optimum values.

Each portion of the internal power circuits is controlled by “power control set” instruction as shown in

Table.1. In addition, the combination of power supply circuits is described in Table.2.

Table.1) Power control set

Bits

Portions

D2 Voltage converter

D1 Voltage regulator

D0 Voltage followers

1 :On

1 :On

1 :On

Status

0: Off

0: Off

0: Off

Table.2) Power supply combinations

Status

Using all internal power circuits

Using voltage regulator and

Voltage followers

Using voltage followers

Using only external power supply

D2 D1 D0 Voltage

converter

11 1

On

01 1

Off

00 1

Off

00 0

Off

Voltage

regulator

On

On

Off

Off

Voltage

followers

On

On

On

Off

External

voltage

Vss2

Vout,

Vss2

V5, Vss2

V1 to V5

Capacito

r

terminals

Use

Open

Open

Open

Note1) Capacitor input terminals: C1+, C1-, C2+, C2-, C3-

Note2) Do not use other combinations except examples in Table.2.

Note3) Connect decoupling capacitors on V1 to V5 terminals whenever using the voltage followers.

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