Datasheet > PCA8576C

PCA8576C

更新时间： 2022-03-04 04:46:40

品牌	Logo	应用领域
恩智浦 - NXP		驱动器
页数	文件大小	规格书
44页	330K
描述
Universal LCD driver for low multiplex rates

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PCA8576C 数据手册

PCA8576C

NXP Semiconductors

Universal LCD driver for low multiplex rates

7.3 LCD voltage selector

The LCD voltage selector coordinates the multiplexing of the LCD in accordance with the

selected LCD drive configuration. The operation of the voltage selector is controlled by the

mode-set command from the command decoder. The biasing configurations that apply to

the preferred modes of operation, together with the biasing characteristics as functions of

_LCDand the resulting discrimination ratios (D) are given in Table 5.

Table 5.

Biasing characteristics

Number of:

LCD drive

mode

LCD bias

configuration

V_off(RMS)V_on(RMS)

------------------------ ----------------------- D = ------------------------

V_LCDV_LCDV_off(RMS)

V_on(RMS)

Backplanes Levels

static

∞

1:2 multiplex

1:3 multiplex

1:4 multiplex

⁄

0.354

0.333

0.791

0.745

0.638

0.577

2.236

1.915

1.732

⁄

A practical value for V_LCDis determined by equating V_off(RMS)with a defined LCD

threshold voltage (V_th), typically when the LCD exhibits approximately 10 % contrast. In

the static drive mode a suitable choice is V_LCD> 3V_th.

Multiplex drive modes of 1:3 and 1:4 with ¹⁄₂bias are possible but the discrimination and

hence the contrast ratios are smaller.

Bias is calculated by ------------ , where the values for a are

1 + a

a = 1 for ¹⁄₂bias

a = 2 for ¹⁄₃bias

The RMS on-state voltage (V_on(RMS)) for the LCD is calculated with Equation 1:

a²+ 2a + n

n × (1 + a)²

V_on(RMS)

-----------------------------

(1)

LCD

where the values for n are

n = 1 for static drive mode

n = 2 for 1:2 multiplex drive mode

n = 3 for 1:3 multiplex drive mode

n = 4 for 1:4 multiplex drive mode

The RMS off-state voltage (V_off(RMS)) for the LCD is calculated with Equation 2:

a²– 2a + n

n × (1 + a)²

V_off(RMS)

-----------------------------

(2)

(3)

LCD

Discrimination is the ratio of V_on(RMS)to V_off(RMS)and is determined from Equation 3:

(a + 1)²+ (n – 1)

V_on(RMS)

----------------------

D =

-------------------------------------------

(a – 1)²+ (n – 1)

V_off(RMS)

PCA8576C

All information provided in this document is subject to legal disclaimers.

Product data sheet

Rev. 1 — 22 July 2010

7 of 44

1...4 5 678 9 10...44

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