ISL45042: LCD Module Calibrator

The VCOM voltage of an LCD panel needs to be adjusted to remove flicker. The ISL45042 can be used to digitally adjust a panel's VCOM voltage by controlling its output sink current. The output of the ISL45042 is connected to an external voltage divider and an external VCOM buffer amplifier. In this application, the user can control the VCOM voltage with 7-bit accuracy (128 steps). Once the desired VCOM setting is obtained, the settings can be stored in the non-volatile EEPROM memory, which would then be automatically recalled during every power-up.

The VCOM adjustment and non-volatile memory programming is through a single interface pin (CTL). Once the desired programmed value is obtained, the Counter Enable pin (CE) can be used to prevent further adjustment or programming.

The full-scale sink current of the ISL45042 is set using an external resistor connected to the SET pin. The full-scale sink current determines the lowest voltage of the external voltage divider.

The ISL45042 is available in an 8 Ld 3mmx3mm TDFN package with a maximum thickness of 0.8mm for ultra thin LCD panel design.

Key Features
  • 128-Step Adjustable Sink Current Output
  • 2.6V to 3.6V Digital Supply Voltage Operating Range (3.0V Minimum Programming Voltage)
  • 4.5V to 20V Analog Supply Voltage Operating Range (10.8V Minimum Programming Voltage)
  • Rewritable EEPROM for Storing the Optimum VCOM Value
  • Output Adjustment Enable/Disable Control
  • Output Guaranteed Monotonic Over-Temperature
  • Two Pin Adjustment, Programming and Enable
  • Ultra Thin 8 Ld 3mmx3mm DFN (0.8mm Max)
  • Pb-Free (RoHS Compliant)
Applications
  • LCD Panels
Typical Diagram
Application Notes
TitleTypeUpdatedSizeOther Languages
AN1208: LCD screens don't flicker - or do theyPDF13 Nov 2014162 KB
AN1157: Power Supply and DC to DC Converter Control using Intersil Digitally Controlled Potentiometers (XDCPs)PDF13 Nov 201489 KB
Datasheets
TitleTypeUpdatedSizeOther Languages
ISL45042 DatasheetPDF17 Nov 2014345 KB
User Guides
TitleTypeUpdatedSizeOther Languages
ISL45042EVAL1Z User GuidePDF13 Nov 2014193 KB
Order Information
Part NumberPackage TypeWeight(g)PinsMSL RatingPeak Temp (°C)RoHS Status
ISL45042IR8 Ld DFN0.0228240
ISL45042IR-T8 Ld DFN T+R0.0228240
ISL45042IRZ8 Ld DFN0.020782260RoHS
ISL45042IRZ-T8 Ld DFN T+R0.020782260RoHS
ISL45042IRZ-TK8 Ld DFN T+R0.020782260RoHS
ISL45042EVAL1ZN/ARoHS
ISL45042EVAL1N/A
ISL45042 Datasheet 17 Nov 2014
8 Ld DFN T+R ISL43L122
8 Ld DFN T+R ISL45042
ISL45042
AN1208: LCD screens don't flicker - or do they 13 Nov 2014
AN1157: Power Supply and DC to DC Converter Control using Intersil Digitally Controlled Potentiometers (XDCPs) 13 Nov 2014
ISL45042EVAL1Z User Guide 13 Nov 2014