STVM100 Datasheet, PDF (1/27 Pages) STMicroelectronics – I2C LCD VCOM calibrator

STVM100
I²C LCD VCOM calibrator
Features
■ I²C interface, slave address: 1001111
■ 7-bit adjustable sink current output
■ 2.25V to 3.6V logic supply voltage V_DD
■ AV_DD operating voltages
– 4.5V to 20V for V_DD from 2.6V to 3.6V
– 4.5V to 13V for V_DD from 2.25V to 3.6V
■ EEPROM for storing the optimum V_COM setting
■ Guaranteed monotonic output over operating
range
■ 400kHz maximum interface bus speed
■ Operating temperature: –40°C to 85°C
■ Available in an 8-pin 3mm x 3mm TDFN8 or
3mm x 3mm TSSOP8 Package
Applications
■ TFT-LCD panels
TDFN8 (3mm x 3mm) (DC)
TSSOP8 (3mm x 3mm) (DS)
Description
The STVM100 is a programmable VCOM adjust-
ment solution for thin-film transistor (TFT) liquid-
crystal displays (LCDs) to remove “flickers”. It can
replace a mechanical potentiometer, so that the
factory operator can physically view the front
screen when performing the VCOM adjustment.
This significantly reduces labor costs, increases
reliability, and enables automation.
STVM100 provides a digital I²C interface to con-
trol the sink current output (I_OUT). This output
drives an external resistive voltage divider, which
can then be applied to an external V_COM buffer.
Three external resistors R₁, R₂, and R_SET deter-
mine the highest and lowest value of the V_COM.
An increase in the output sink current will lower
the voltage on the external divider so that the
V_COM can be adjusted by 128 steps within this
range. Once the desired V_COM setting is
achieved, it can be stored in the internal
EEPROM that will be automatically recalled dur-
ing each power-up.
STVM100 is available in an 8-pin, 3mm x 3mm
TDFN8 or 3mm x 3mm TSSOP8 package.
Table 1. Device summary
Order code
Optimum temperature range
STVM100DC6E
-40°C to 85°C
STVM100DS6F
-40°C to 85°C
Package
TDFN
TSSOP
Packing
ECOPACK package, tubes
ECOPACK package, tape and reel
July 2007
Rev 6
1/27
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