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DATASHEET
TFT-LCD I
2
C Programmable VCOM Calibrator
ISL45041
The V
COM
voltage of an LCD panel needs to be adjusted to
remove flicker. This part provides a digital interface to control
the sink current output that attaches to an external voltage
divider. The increase in output sink current lowers the voltage
on the external divider, which is applied to an external V
COM
buffer amplifier. The desired V
COM
setting is loaded from an
external source via a standard 2-wire I
2
C serial interface. At
power-up, the part automatically comes up at the last
programmed EEPROM setting.
An external resistor attaches to the SET pin and sets the
full-scale sink current that determines the lowest voltage of
the external voltage divider.
The ISL45041 is available in an 8 Ld 3mmx3mm TDFN
package with a maximum thickness of 0.8mm for ultra thin
LCD panel design.
An evaluation kit complete with software to control the DCP
from a computer is available. Reference Application Note
AN1275
and “Ordering Information” on page 2.
Features
• 128-step adjustable sink current output
• 2.25V to 3.6V logic supply voltage operating range (2.6V
minimum programming voltage)
• 4.5V to 18V analog supply voltage operating range (10.8V
minimum programming voltage)
•I
2
C interface with addresses 100111x and 100110x
• On-chip 7-Bit EEPROM
•Output adjustment SET pin
• Output guaranteed monotonic over-temperature
• Thin 8 Ld 3mmx3mm DFN (0.8mm max)
• Pb-free (RoHS compliant)
Applications
•LCD panels
Related Literature
• AN1208 “LCD screens don't flicker - or do they?”
• AN1244
, “ISL45041 and ISL29001 Flicker Control User’s
Manual”
• AN1275
, “ISL45041EVAL1Z User’s Manual”
FIGURE 1. BLOCK DIAGRAM
GND
I
2
C
INTERFACE
DAC
REGISTERS
ANALOG DCP
AND
CURRENT SINK
7-BIT EEPROM
SCL
SDA
WP
V
DD
A
VDD
OUT
SET
1
8
25
7
6
3
4
ISL45041
CURRENT SINK
Q1
A1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Copyright Intersil Americas LLC. 2005- 2007, 2010, 2014. All Rights Reserved
Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the property of their respective owners.
October 30, 2014
FN6189.5
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