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STVM100 Datasheet(PDF) 11 Page - STMicroelectronics

No. de pieza STVM100
Descripción Electrónicos  I2C LCD VCOM calibrator
PDF  27 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STVM100 Datasheet(HTML) 11 Page - STMicroelectronics

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STVM100
Application information
11/27
3
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
R1
R2
SET
STVM100
+
–
AVDD
OUT
AI12933
I
OUT
D1
+
128
--------------
AV
DD
20 R
SET
()
--------------------------
⋅
=
V
COM
R
2
R
1
R
2
+
-------------------- AV
DD 1
D1
+
128
--------------
R
1
20 R
SET
()
--------------------------
⋅
–
⎝⎠
⎛⎞
⋅
=



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