NJU6680 데이터 시트보기 (PDF) - Japan Radio Corporation

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NJU6680

128-common x 128-segment 4-level Gray Scale BITMAP LCD DRIVER

Japan Radio Corporation  

NJU6680

(e) Internal Power Circuits

The internal power circuits are composed of the voltage converter, voltage regulator with 64-level EVR,

and voltage followers. The status of the internal power circuits is arranged by the “Power control set”

instruction, as shown in Table 1. For this arrangement, the part of the internal power circuits can be used

in combination with an external power supply, as shown in Table 2.

The internal power circuits require the optimum values for the passive components, such as V0 to V4

capacitors and external feedback resistors in accordance with an LCD panel; and accordingly should be

evaluated by using of actual LCD module samples to decide these values.

Table 1. Power control set

Bits

Portions

VC Voltage converter

VR Voltage regulator

VF Voltage followers

1: ON

1: ON

1: ON

Status

0: OFF

0: OFF

0: OFF

Combination

Using all internal power

circuits

Using voltage regulator and

voltage followers

Using voltage followers

Using only external power

Supply

Table 2. Power supply combinations

Instruction

Power supply circuits

VC

VR

VF

Voltage

converter

Voltage

regulator

Voltage

followers

111

ON

ON

ON

0 1 1 OFF

ON

ON

0 0 1 OFF

OFF

ON

0 0 0 OFF

OFF

OFF

Output terminals

VOUT

V0

V1-V4

Open Open Open

External

Open

Open

Open

External

External

Open

Open

External

Note) De coupling capacitors on the V0 to V4 terminals are required when the voltage followers are enabled.

Ver.2003-04-08

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