STVM100 datasheet(12/27 Pages) STMICROELECTRONICS

No. de pieza	STVM100

Descripción Electrónicos	I2C LCD VCOM calibrator

PDF	27 Pages

Scroll/Zoom	100%

Fabricante Electrónico	STMICROELECTRONICS [STMicroelectronics]

Página de inicio	http://www.st.com

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12 / 27 page

Application information

STVM100

12/27

If the user-selected value is 0 (zero scale), the minimum current is sunk. The maximum

VCOM value is obtained in Equation 3.

Equation 3

If the user-selected value is 127 (full scale), the maximum current is sunk and the minimum

VCOM value is obtained in Equation 4.

Equation 4

During operation, the VCOM(max) and VCOM(min) range is set, based on different TFT-LCD

processes.The R1 value is given based on the acceptable power loss from the AVDD supply

rail. Using Equation 3 and Equation 4, the R2 and RSET values can be calculated. If RSET is

put into Equation 1 on page 11 and maximum IOUT ≥ 120µA, then R1 should be increased.

COM max

()

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

DD 1

128

----------

20 R

SET

()

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

⋅

–

⎝⎠

⎛⎞

⋅

COM min

()

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

DD 1

20 R

SET

()

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

–

⎝⎠

⎛⎞

⋅

STVM100 Datasheet(PDF) 12 Page - STMicroelectronics