NJU6631ACH 데이터 시트보기 (PDF) - Japan Radio Corporation

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NJU6631ACH

16-CHARACTER 1-LINE DOT MATRIX LCD CONTROLLER DRIVER

Japan Radio Corporation  

NJU6631A

(4) LCD Display

(4-1) Power Supply for LCD Driving

NJU6631A incorporates bleeder resistance to generate the LCD display driving waveform.

The bleeder resistance is set 1/5 bias suitable for 1/18 duty ratio and 1.5kΩ per resistance.

Furthermore, the bias level can be changed by connecting external resistance between the V2, V3 terminals,

if needed.

Table 5. LCD Driving Voltage vs Duty Ratio

Duty Ratio

1/16

Power

Supply

Bias

V2

V3

V5

1/5

VDD-2/5VLCD

VDD-3/5VLCD

VDD-VLCD

VDD

V2

VLCD

V3

V5

VDD

R1

V1

R1

V2

R1

V3

R1

V4

R1

V5

NJU6631A internal

Note) Power ON or power OFF is in the following order.

Power ON

: V5 should be turned on after the VDD turned on or at the same time.

Power OFF

: V5 should be turned off before the VDD turned off or at the same time.

(4-2) Relation between oscillation frequency and LCD frame frequency.

LCD frame frequency example mentioned below is based on 270kHz oscillation.

The clock for the LCD Driving is using 270kHz (1 clock=3.7us).

1/16 Duty

40 clock

1 23 4

16 1 2 3 4

VDD

V1

V2

V3

V4

V5

1 frame

1 frame

1 frame=3.7(us)x40x16x4=9,472(ms)

Frame frequency=1/9,472(ms)=105.6(Hz)

16 1 2 3

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