UC1608XFAC 데이터 시트보기 (PDF) - Unspecified

부품명

상세내역

제조사

UC1608XFAC

128x240 Matrix LCD Controller-Drivers

Unspecified 

UC1608

128x240 Matrix LCD Controller-Drivers

LCD VOLTAGE SETTING

MULTIPLEX RATES

Multiplex Rates (MR) is software programmable.

Two MR is supported: 96, 128.

BIAS RATIO SELECTION

Bias Ratio (BR) is defined as the ratio between

VLCD and VBIAS, i.e.

BR = VLCD /VBIAS,

where VBIAS = VB1+ – VB1– = VB0+ – VB0–.

The theoretical optimum Bias Ratio can be

estimated by Mux +1. In some applications, BR

is set to be 10~15% lower than the optimum value

calculated above in order to lower VLCD by 5~6%.

Such setting generally will not cause visible change

in image quality.

UC1608 supports four BR as listed below. BR can

be selected by software program.

BR

0

1

2

3

Bias Ratio 10.7 11.3 12 12.7

Table 2: Bias Ratios

TEMPERATURE COMPENSATION

Four (4) different temperature compensation

coefficients can be selected via software. The four

coefficients are given below:

TC

o

% per C

0

1

2

3

0.0 –0.05 –0.10 –0.20

Table 4: Temperature Compensation

VLCD GENERATION

VLCD may be supplied either by internal charge

pump or by external power supply. The source of

VLCD is controlled by PC[2:1]. For good product

performance it is recommended to keep VLCD under

13V at room temperature.

When VLCD is generated internally, the voltage level

of VLCD is determined by four control registers: BR

(Bias Ratio), GN (Gain), PM (Potentiometer), and

TC (Temperature Compensation), with the

following relationship:

VLCD = (CV 0 + CPM × PM ) × (1 + (T − 25) × CT %)

where

CV0 and CPM are two constants, whose value

depends on the BR-GN register setting. The

values are provided in the table on the next

page,

PM is the numerical value of PM register,

T is the ambient temperature in OC, and

CT is the temperature compensation coefficient

as selected by TC register.

LOAD DRIVING STRENGTH

The power supply circuit of UC1608 is designed to

handle LCD panels with load capacitance up to

~20nF when VDD2 = 2.5V. For larger LCD panels

use higher VDD and COF packaging.

(Revision 0.52 Preview)

15

Share Link: