LM8342SD/NOPB National Semiconductor, LM8342SD/NOPB Datasheet - Page 9

• Manufacturer Part Number: LM8342SD/NOPB
• Description: IC PROG TFT CALIBRATOR 10-LLP
• Manufacturer: National Semiconductor

Specifications of LM8342SD/NOPB

• Applications: *
• Mounting Type: Surface Mount
• Package / Case: 10-LLP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: LM8342SD; LM8342SDTR

Figure 3 shows a block diagram of a TFT panel. The V
buffer supplies a common voltage (V
TFT panel. In general, V
middle of the gamma voltage range. Screen performance can
be optimized by tuning the V
procedure. Using the LM8342, the V
dure is simplified by elimination of the potentiometer adjust-
ment task. This task is currently performed at the factory using
a trimmer adjustment tool and visual inspection, when using
a stable reference voltage and a potentiometer as a voltage
divider to generate the V
COM
COM
voltage.
is a DC voltage that is in the
COM
voltage in the calibration
COM
COM
) to all the pixels in a
FIGURE 4. Block Diagram of the LM8342
calibration proce-
FIGURE 3. TFT Panel Block Diagram
COM
9
PRINCIPLE OF OPERATION OF THE LM8342
The LM8342 is an integrated combination of a digitally con-
trolled current sink and a non-volatile register (7 bits EEP-
ROM). Writing data can be done using the I
interface. Data can be written to a volatile register and can
also be stored in the non-volatile EEPROM. A simplified block
diagram of the LM8342 is given in Figure 4.
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C compatible
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