STE2004DIE2 datasheet(8/66 Pages) STMICROELECTRONICS

Part #	STE2004DIE2

Description	102 X 65 SINGLE CHIP LCD CONTROLLER / DRIVER

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Table 3.

The following table Bias Level for m = 65 and m = 49 are provided:

Table 4.

3.6 LCD Voltage Generation

The LCD Voltage at reference temperature (To = 27°C) can be set using the VOP register content according to

the following formula:

VLCD(T=To) = VLCDo = (Ai+VOP · B)

(i=0,1,2)

with the following values:

Note that the three PRS values produce three adjacent ranges for VLCD. If the VOP register and PRS bits

are set to zero the internal voltage generator is switched off.

The proper value for the VLCD is a function of the Liquid Crystal Threshold Voltage (Vth) and of the Mul-

tiplexing Rate. A general expression for this is:

For MUX Rate m = 65 the ideal VLCD is:

VLCD(to) = 6.85 · Vth

than:

BS2

BS1

BS0

n

000

7

001

6

010

5

011

4

100

3

101

2

110

1

111

0

Symbol

m = 65 (1/9)

m = 49 (1/8)

V1

VLCD

V2

8/9*VLCD

7/8*VLCD

V3

7/9*VLCD

6/8*VLCD

V4

2/9*V VLCD

2/8*VLCD

V5

1/9 *VLCD

1/8*VLCD

V6

VSS

Symbol

Value

Unit

Note

Ao

2.95

V

PRS = [0;0]

A1

6.83

V

PRS = [0;1]

A2

10.71

V

PRS = [1;0]

B

0.0303

V

To

27

°C

V

LCD

1m

+

21

1

m

---------

–





⋅

------------------------------------ V

th

⋅

=

V

op

6.85 V

th

A

i

–

⋅

()

0.03

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

=

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