stvm100 STMicroelectronics, stvm100 Datasheet - Page 12

• Manufacturer Part Number: stvm100
• Description: I2c Lcd Vcom Calibrator
• Manufacturer: STMicroelectronics

12/27
If the user-selected value is 0 (zero scale), the minimum current is sunk. The maximum
V
Equation 3
If the user-selected value is 127 (full scale), the maximum current is sunk and the minimum
V
Equation 4
During operation, the V
processes.The R1 value is given based on the acceptable power loss from the AV
rail. Using
put into
COM
COM
value is obtained in
value is obtained in
Equation 1 on page 11
Equation 3
V
COM max
V
and
COM min
COM(max)
Equation
Equation
Equation
and maximum I
=
and V
=
-------------------- AV
R
1
3.
4.
-------------------- AV
R
4, the R
R
+
1
2
R
COM(min)
R
+
2
2
R
2
2
and R
DD
OUT
range is set, based on different TFT-LCD
DD
⎛
⎝
1
SET
⎛
⎝
–
1
120µA, then R
--------- -
128
–
1
values can be calculated. If R
------------------------- -
20 R
R
------------------------- -
20 R
SET
1
R
SET
1
⎞
⎠
1
should be increased.
⎞
⎠
DD
supply
SET
is