STVM100 datasheet(11/27 Pages) STMICROELECTRONICS

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STVM100

Application information

11/27

Application information

The STVM100 is a programmable VCOM calibrator for the TFT-LCD to remove flickers. It

provides a digital I2C interface to control the sink current output. This output drives an

external resistive voltage divider, which can then be applied to an external VCOM buffer.

The highest and lowest VCOM value is determined by three resistors, R1, R2, and RSET. The

connection is shown in Figure 8.

The sink current from the STVM100 OUT pin is given in Equation 1. This current then flows

through RSET. This current must be less than 120µA (see ISET value in Table 7 on page 15).

Figure 8.

R1, R2, and RSET connection

Equation 1

Note:

“D” is a user-selected value, an integer ranging from 0 to 127.

The VCOM value can be obtained in Equation 2.

Equation 2

AVDD

IOUT

VCOM

AVDD

RSET

SET

STVM100

–

AVDD

OUT

AI12933

OUT

128

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

20 R

SET

()

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

⋅

COM

-------------------- AV

DD 1

128

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

20 R

SET

()

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

⋅

–

⎝⎠

⎛⎞

⋅

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